JP2014103838A - Dc power distribution system, system management device, computer program, and power demand-supply control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a DC power distribution system capable of surely stabilizing a voltage of a DC power distribution line.SOLUTION: The DC power distribution system comprises a conversion device 2 for a power generation apparatus, a conversion device 13 for an AC power system, and conversion devices 4, 5 for load apparatuses connected to a DC power distribution line 1, respectively. The conversion device 2 for the power generation apparatus and the conversion device 13 for the AC power system performs first and second power control defined as follows, independently of each other. Namely, the first power control is defined as power control performed by the conversion device 2 for the power generation apparatus in such a manner that power supplied to the DC power distribution line 1 becomes a target value (Vdc target value (special high)) corresponding to a preset voltage higher than a standard value of a voltage Vdc of the DC power distribution line 1. The second power control is defined as power control performed by the conversion device 13 for the AC power system in such a manner that power supplied to the DC power distribution line 1 or power supplied from the DC power distribution line 1 becomes a target value (Vdc target value (standard)) corresponding to a standard value of the voltage Vdc of the DC power distribution line 1.

Description

  The present invention relates to a DC power distribution system that distributes DC power through a DC power distribution line, a system management device, a computer program, and a power supply / demand control method used in this system.

Currently, AC power supplies are used as commercial power supplies, but in order to suppress energy loss when converting from AC to DC, DC distribution systems that distribute electric power to various electric products have already been introduced. (See Patent Document 1).
In addition, utilization of natural energy is demanded as a measure against global warming, and solar power generation is spreading in the home. Therefore, a DC power distribution system that stores DC power obtained by solar power generation in a storage battery and supplies the power directly to an electrical product is also used.

JP 2003-204682 A

In the conventional DC power distribution system described above, when some power generators go down or the load increases rapidly, the voltage of the DC power distribution line greatly decreases below a specified value, and power cannot be stably supplied to the load device. There is.
An object of this invention is to provide the DC distribution system etc. which can stabilize the voltage of a DC distribution line reliably in view of this conventional problem.

  (1) A DC power distribution system according to the present invention includes a converter for a power generator that converts the power from the power generator into a DC distribution line and converts the power from the AC power system into a voltage. AC power system converter that supplies or converts the power from the DC power distribution line to the AC power system, and converts the power from the DC power distribution line to supply to the load device A load device conversion device.

In addition, in the DC power distribution system of the present invention, the power generator conversion device and the AC power system conversion device perform first and second power control defined below independently of each other. .
First power control: Power control performed by the converter for power generator so that the power supplied to the DC distribution line becomes a target value corresponding to a set voltage higher than the standard value of the voltage of the DC distribution line. Control: Power control performed by the AC power system converter so that the power supplied to the DC distribution line or the power supplied from the DC distribution line becomes a target value corresponding to the standard value of the voltage of the DC distribution line.

According to the DC power distribution system of the present invention, the first and second power controls are performed independently of each other. Therefore, in the power supply / demand situation where the second power control is successful, the voltage of the DC power distribution line is reduced. A standard value (for example, rated voltage) is maintained, and the difference between the high set voltage and the voltage of the DC distribution line does not become small.
For this reason, the input power to the DC distribution line necessary for the first power control performed by the power generation apparatus conversion device increases, and the power generation apparatus conversion device inputs the maximum possible value of the generated power to the DC distribution line.

On the other hand, when the second power control by the AC power system converter fails and the voltage of the DC distribution line rises, the difference between the high set voltage and the voltage of the DC distribution line becomes small. The first power control by the converter for power generator is successful, and the voltage of the DC distribution line is maintained so as not to exceed the high set voltage.
Thus, according to the DC power distribution system of the present invention, the voltage of the DC power distribution line can be maintained within a predetermined range by the power control performed independently by the converter for the power generator and the AC power system. There is no fear that control will be impossible due to a communication abnormality, control for maintaining the voltage of the DC distribution line within a predetermined range can be performed reliably, and the voltage of the DC distribution line can be reliably stabilized.

(2) In the DC power distribution system of the present invention, when the power target value corresponding to the high set voltage exceeds the maximum power that can be generated by the power generator, the converter for a power generator sets the maximum power. It is preferable to set the target value for the first power control.
The reason is that even if the power target value is set to a value that exceeds the maximum power that can be generated by the power generation device, the power generation device cannot output the value, and the first power control can be performed appropriately. It is not possible.

(3) In the DC power distribution system of the present invention, the AC power system conversion device has a Po maximum possible value in which the power target value corresponding to the standard value is the maximum power that can be output from the DC power distribution line to the own device. In the case where it exceeds, it is preferable that the Po maximum possible value is set as the target value of the second power control.
The reason is that even if the power target value is set to a value that exceeds the maximum Po value of the AC power system converter, the AC power system cannot be reversely flowed, and the second power control is appropriately performed. Because you can't.

(4) In addition, when there is an AC load device under the system that is directly supplied with power from the AC power system without passing through the DC power distribution line, the AC power system conversion device is, for example, By adding the Psb maximum possible value and the following Pals subtotal value, the Po maximum possible value for the device itself may be calculated.
Psb maximum possible value: maximum reverse flow power that the AC power system can reverse flow Pals subtotal value: total value of the load power of the AC load device under the system for its own device In this way, the AC load under the above system Even when there is a device, it is possible to accurately calculate the Po maximum possible value of the AC power system converter.

(5) In the DC power distribution system of the present invention, the AC power system conversion device has a Pi maximum possible value in which the power target value corresponding to the standard value is the maximum power that can be input from the device to the DC power distribution line. In the case of exceeding P i, it is preferable to set the maximum Pi possible value as the target value for the second power control.
The reason is that even if the power target value is set to a value that exceeds the Pi maximum possible value of the converter for the AC power system, it cannot be covered by the forward current from the AC power system, and the second power control is appropriately performed. It is because it cannot be done.

(6) In addition, when there is an AC load device under the system that is directly supplied with power from the AC power system without passing through the DC power distribution line, the AC power system conversion device is, for example, The Pi maximum possible value for the device itself may be calculated by subtracting the following Pals subtotal value from the Psf maximum possible value.
Psf maximum possible value: maximum forward power that the AC power system can flow forward Pals subtotal value: total value of load power of the AC load device under the grid for its own device In this way, the AC load under the above system Even when there is a device, the maximum Pi possible value of the AC power system conversion device can be accurately calculated.

(7) In the DC power distribution system of the present invention, the AC power system conversion device uses an average value of each value for each AC cycle for the voltage value and the power value that are the control targets of the second power control. It is preferable.
The reason is that if the control target is an average value for each AC cycle, the ripple generated in the voltage of the DC distribution line is not suppressed, and the current distortion on the AC power system side that becomes a problem when suppressing the ripple is reduced. This is because the second power control can be performed without this.

  (8) Therefore, in the DC power distribution system of the present invention, a ripple that can occur in the voltage of the DC power distribution line is a predetermined ratio (for example, a ratio arbitrarily selected from a range of 0.01 to 0.03) to the standard value. It is preferable that the total value of the capacitances of the capacitors on the DC distribution line side is determined so as to be within the multiplied allowable range.

(9) Also, in this case, if the total value of the capacitance of the capacitor on the DC distribution line side is determined by adjusting the capacitance of the capacitor for the converter for AC power system, There is no need to consider the capacitance of the capacitor for other converters such as converters.
For this reason, there is an advantage that the design of the system becomes easier as compared with the case where the total value of the capacitance is designed in consideration of all the conversion devices.

(10) (13) In the DC power distribution system of the present invention, when the system management device further capable of controlling power supply and demand in the system is further provided, the system management device is configured such that the voltage of the DC power distribution line is a standard value. It is preferable to perform the first supply-demand control for reducing the following Pdcp total value or Pdcn total value so that the voltage falls within the predetermined range when the voltage falls outside the predetermined range.
Pdcp aggregate value: excess power in DC distribution line Pdcn aggregate value: insufficient power in DC distribution line

According to the DC power distribution system of the present invention, since the system management device performs the first supply and demand control, when the voltage of the DC power distribution line deviates from the standard value, either the Pdcp total value or the Pdcn total value is obtained. The voltage of the DC distribution line is maintained within a predetermined range from the standard value.
As described above, according to the DC power distribution system of the present invention, the voltage of the DC power distribution line is maintained by reducing the Pdcp total value or the Pdcn total value, so that compared with the case where only the power control such as the converter for an AC power system is relied on. Thus, the voltage of the DC distribution line can be more reliably stabilized.

  (11) (14) In the DC distribution system of the present invention, the first supply and demand control does not determine whether to reduce the Pdcp total value or the Pdcn total value based on the voltage of the DC distribution line itself. Further, it may be a control for determining whether or not to perform the reduction based on the output power to the AC power system conversion device or the input power from the same device.

That is, when the following Po maximum possible value is smaller than the following Pdcp total value, the system management device reduces the Pdcp total value so that the Po maximum possible value is equal to or greater than the Pdcp total value, and When the Pi maximum possible value is smaller than the following Pdcn total value, the Pdcn total value may be reduced so that the Pi maximum possible value is not less than the Pdcn total value.
Pdcp total value: excess power in DC distribution line Pdcn total value: insufficient power in DC distribution line Po maximum possible value: maximum power that can be output from DC distribution line to converter for AC power system Pi maximum possible value: for AC power system Maximum power that can be input from converter to DC distribution line

  The reason is that if the maximum Po value of the converter for the AC power system <Pdcp total value, the voltage of the DC distribution line rises out of the predetermined range, and the maximum Pi value of the converter for the AC power system <In the case of the total value of Pdcn, the voltage of the DC distribution line falls from the predetermined range and deviates. Therefore, the first supply and demand control performed based on the power standard is described in (10) and (13) above. This is because the control is substantially the same as the first supply and demand control performed on the voltage basis.

In the embodiment described later, the total value of “Po maximum possible value” and “Pi maximum possible value” of the same type of conversion device are assumed on the assumption that a plurality of the same type “conversion devices” are connected to the DC distribution line. May be referred to as “Po maximum possible value total value” and “Pi maximum possible value total value”.
However, in the claims and the (Means for Solving the Problems) column of this specification, even if one or a plurality of conversion devices of the same type are used, the “Po maximum possible value” It is assumed that “Pi maximum possible value”.

  (12) (15) In the DC power distribution system of the present invention viewed from another viewpoint, the difference obtained by subtracting the Pdcp total value from the Po maximum possible value of the AC power system conversion device by the system management device is first. If it is smaller than the threshold, the Pdcp total value is reduced so that it is equal to or higher than the first threshold, and the difference obtained by subtracting the Pdcn total value from the Pi maximum possible value of the AC power system converter is smaller than the second threshold. In this case, the second supply and demand control is performed to reduce the Pdcn total value so as to be equal to or higher than the second threshold value.

According to the DC power distribution system of the present invention, since the system management device performs the second supply and demand control, the Po maximum possible value of the AC power system conversion device with a margin corresponding to the first and second threshold values> The power supply and demand state is maintained such that the Pdcp total value and the Pi maximum possible value of the AC power system converter> Pdcn total value.
For this reason, excess power or shortage power in the DC distribution line can be reliably covered by reverse power flow to the AC power system or forward power flow from the AC power system, thereby stabilizing the voltage of the DC distribution line more reliably. can do.

(16) In the DC power distribution system of the present invention, the system management device may be capable of executing both the first supply / demand control and the second supply / demand control. In this case, it is preferable to perform the second supply / demand control after performing the first supply / demand control.
The reason for this is that the first supply and demand control is a post hoc control performed when the voltage of the DC distribution line is out of the predetermined range, whereas the second supply and demand control is a Pdcp total value in consideration of a margin. Or it is because it is preventive control which reduces Pdcn total value beforehand, Therefore The direction which performs the former first can stabilize the voltage of a DC distribution line more reliably.

(17) In the DC power distribution system of the present invention, the Pdcp total value can be reduced by, for example, increasing the load power in the system or reducing the generated power in accordance with a predetermined priority order for reducing Pdcp. it can.
(18) Further, the Pdcn total value can be reduced by, for example, reducing the load power in the system or increasing the generated power in accordance with a predetermined priority order for Pdcn reduction.

  (19) More specifically, the system management apparatus includes a Pdcp total value reduction list in which devices and operations for increasing load power and devices and operations for reducing generated power are arranged in a predetermined priority order, and load power When there is a Pdcn total value reduction list in which devices and operations for reducing power generation and devices and operations for increasing generated power are arranged in a predetermined priority order, the operations described in the list are performed according to the priority order. Thus, the Pdcp total value or the Pdcn total value can be reduced.

  (20) (21) The DC power distribution system of the present invention (which may be either a DC power distribution system that does not include a system management device or a DC power distribution system that includes a system management device) is from a power storage device. A power storage device conversion device may be further provided that converts the power of the power supply into the DC power distribution line and supplies the power to the power storage device.

(22) In this case, the reduction of the Pdcp total value includes increasing the charging power to the power storage device or decreasing the discharge power from the power storage device in accordance with a predetermined priority order for reducing Pdcp. Can do.
(23) Further, the reduction of the Pdcn total value may include reducing the charge power to the power storage device or increasing the discharge power from the power storage device according to a predetermined priority order for reducing Pdcn. it can.

  (24) More specifically, the system management device performs a predetermined operation for a device and operation for increasing load power, a device and operation for reducing generated power, and a device and operation for increasing charging power to the power storage device. Pdcp total value reduction list arranged in order of priority, equipment and operation for reducing load power, equipment and operation for increasing generated power, and equipment and operation for increasing discharge power from the power storage device in a predetermined priority order In the case of having an arranged Pdcn total value reduction list, the Pdcp total value or the Pdcn total value can be reduced by performing the operations described in the list according to the priority order.

  (25) When performing the reduction process according to the list, the system management apparatus performs the operation according to the Pdcn total value reduction list that has already been performed before performing the operation according to the Pdcp total value reduction list. It is preferable to cancel the operation according to the Pdcp total value reduction list already performed before performing the operation according to the Pdcn total value reduction list.

  The reason is that the Pdcp total value reduction list and the Pdcn total value reduction list are the lists that have the opposite effect on the power of the DC distribution line, so follow the other list before performing the current operation according to one list. If the past operation is canceled, a certain reduction effect can be obtained before performing the current operation according to one list, and the Pdcp total value or the Pdcn total value is more efficient than the case where only the current operation is performed. This is because it can be reduced.

  (26) In the DC power distribution system of the present invention, in the case of the reduction of the Pdcp total value, among the power generation device using natural energy and the other power generation devices, the latter priority of reducing the generated power of the latter Is set higher than the priority order of reducing the generated power of the former, and the priority order of increasing the latter load power among the load equipment that is unnecessary and urgent and the other load equipment is the former priority. It is preferable that the priority is set higher than the priority for increasing the load power.

The reason is that when reducing the generated power and reducing the Pdcp total value (excessive power in the DC distribution line), it is preferable from the viewpoint of environmental protection to preferentially reduce the generated power that does not use natural energy. is there.
In addition, when reducing the Pdcp total value (excessive power in the DC distribution line) by increasing the load power, it is more convenient for the user to increase the load power of the load device that is not unnecessarily preferential. This is because the possibility is high.

  (27) Further, in the DC power distribution system of the present invention, in the case of the reduction of the Pdcn total value, the priority to increase the former generated power among the power generation device using natural energy and the other power generation devices. The order is set higher than the priority for increasing the latter generated power, and the priority order for reducing the load power of the former among the load devices not required and the other load devices, The latter is preferably set higher than the priority order for reducing the load power.

The reason for this is that when the generated power is increased to reduce the Pdcn aggregate value (insufficient power in the DC distribution line), it is preferable to increase the generated power using natural energy preferentially from the viewpoint of environmental protection. is there.
Also, when reducing the load power and reducing the Pdcn aggregate value (insufficient power in the DC distribution line), reducing the load power of the unnecessary and urgent load device preferentially will affect the user's convenience more. This is because the load power can be reduced.

  (28) In the DC power distribution system of the present invention, when the Pdcp total value is reduced, the priority order for reducing the discharge power from the power storage device and the priority order for increasing the charge power to the power storage device are naturally It is set higher than the priority for reducing the generated power of the power generation device that uses energy, or lower than the priority for increasing the load power of the load device other than the load device that is not urgently needed. preferable.

The reason is that, when reducing the Pdcp total value (excessive power in the DC distribution line), it is better to prioritize power adjustment to the power storage device than to reduce the power generated by natural energy from the viewpoint of environmental protection. It is because it is preferable.
In addition, when reducing the Pdcp total value (excessive power in the DC distribution line), it is more convenient for the user to increase normal load power that is not unnecessary and urgent than to adjust power to the power storage device. This is because the possibility is high.

  (29) Further, in the DC power distribution system of the present invention, in the case of reducing the Pdcn total value, the priority order for reducing the charging power to the power storage device and the priority order for increasing the discharge power from the power storage device are It is set lower than the priority for increasing the generated power of the power generation device using natural energy, or higher than the priority for reducing the load power of the load device other than the load device that is not urgently needed. It is preferable.

The reason is that, when reducing the Pdcn aggregate value (insufficient power in the DC distribution line), it is better to increase the power generated by natural energy preferentially than from the power adjustment to the power storage device from the viewpoint of environmental protection. It is because it is preferable.
In addition, when reducing the Pdcn aggregate value (insufficient power in the DC distribution line), it is more convenient for the user to prioritize power adjustment to the power storage device than to reduce normal load power that is not unnecessary and urgent. This is because the total Pdcn value can be reduced without significantly affecting the performance.

(30) In the DC power distribution system of the present invention, when the system further includes an AC load device under the system that is directly supplied with power from the AC power system without going through the DC power distribution line, the system management For example, the apparatus may calculate the Po maximum possible value for the AC power system conversion device by adding the following Psb maximum possible value and the following Pals subtotal value.
Psb maximum possible value: maximum reverse power flow that the AC power system can reverse power flow Pals subtotal value: total value of load power of the AC load device under the system for the AC power system conversion device Even when there is a subordinate AC load device, it is possible to accurately calculate the Po maximum possible value of the AC power system converter.

(31) In the DC power distribution system of the present invention, when the system further includes an AC load device under the system that is directly supplied with power from the AC power system without going through the DC power distribution line, the system management Preferably, the device subtracts the following Pals subtotal value from the following Psf maximum possible value to calculate the Pi maximum possible value for the AC power system converter.
Psf maximum possible value: maximum forward power that the AC power system can flow forward Pals subtotal value: total value of load power of the AC load device under the system for the converter for the AC power system In this way, the above system Even when there is a subordinate AC load device, the Pi maximum possible value of the AC power system converter can be accurately calculated.

  (32) And, in the case of a DC power distribution system including AC load devices under the above system, the system management device uses the following PdcpPals total value and PdcnPals total value instead of the Pdcp total value and Pdcn total value. Using the following PoPals maximum possible value and PiPals maximum possible value of the AC power system conversion device instead of the Po maximum possible value and Pi maximum possible value of the AC power system conversion device, the first or It is preferable to perform the second supply and demand control.

PdcpPals total value: Pdcp total value-Pals total value PdcnPals total value: Pdcn total value + Pals total value PoPals maximum possible value: Po maximum possible value-Pals subtotal value (≈Psb maximum possible value)
PiPals maximum possible value: Pi maximum possible value + Pals subtotal value (≈Psf maximum possible value)
Total value of Pals: Total load power of AC load devices under all systems

  In this way, AC load devices and branching devices under the system that receive power supply directly from the AC power system can also be included in the Pdcp total value and Pdcn total value reduction targets. There is an advantage that the supply and demand control 2 can be performed more reliably.

(33)-(35) The system management apparatus of this invention is a system management apparatus used for the direct-current power distribution system described in the above-mentioned (10)-(32).
Therefore, the system management device of the present invention has the same effects as the DC power distribution system described in the above (10) to (32).

  (33) Specifically, the system management device of the present invention can control power supply and demand in a DC distribution system that can cope with an excess or shortage of power in a DC distribution line by a reverse power flow or a forward power flow in an AC power system. A system management device that performs the process of reducing the Pdcp total value or the Pdcn total value so that the voltage falls within a predetermined range when the voltage of the DC distribution line falls outside a predetermined range from a standard value. 1 supply-demand control is performed.

  (34) Further, the system management apparatus of the present invention is capable of managing power supply and demand in the DC distribution system, which can cope with excess or deficiency of power in the DC distribution line by reverse power flow or forward power flow of the AC power system. The Pdcp total value is reduced so that the Po maximum possible value of the AC power system converter is equal to or greater than the Pdcp total value, and the Pi maximum possible value of the AC power system converter is the Pdcn. The first supply and demand control is performed to reduce the Pdcn total value so as to be equal to or greater than the total value.

  (35) Furthermore, the system management apparatus of the present invention is a system management that performs power supply and demand control in a DC power distribution system that can cope with an excess or shortage of power in a DC power distribution line by a reverse power flow or a forward power flow in the AC power system. A Pdcp total value is reduced such that a difference obtained by subtracting the Pdcp total value from the Po maximum possible value of the AC power system conversion device is equal to or greater than a first threshold, and the AC power system conversion device The second supply and demand control is performed to reduce the Pdcn total value so that the difference obtained by subtracting the Pdcn total value from the Pi maximum possible value is equal to or greater than the second threshold value.

(36) to (38) The computer program according to the present invention is an apparatus for performing power supply and demand control in a DC distribution system, capable of dealing with an excess or deficiency of power in a DC distribution line by a reverse power flow or a forward power flow in an AC power system. As a computer program for causing a computer to function, the control described in the above (10) to (32) is realized.
Therefore, the computer program of the present invention has the same operational effects as the DC power distribution system described in the above (10) to (32).

  (36) Specifically, the computer program of the present invention performs power supply and demand control in the DC distribution system, which can cope with excess or deficiency of power in the DC distribution line by reverse power flow or forward power flow of the AC power system. As a device, a computer program for causing a computer to function, the step of determining whether the voltage of the DC distribution line is out of a predetermined range from a standard value, and when the determination result is affirmative, Reducing the Pdcp total value or the Pdcn total value so that the voltage of the DC distribution line falls within a predetermined range.

  (37) Further, the computer program of the present invention is an apparatus for performing power supply and demand control in a DC distribution system that can cope with an excess or shortage of power in a DC distribution line by a reverse power flow or a forward power flow in an AC power system. A computer program for causing a computer to function, the step of reducing the Pdcp total value so that the maximum Po value of the AC power system conversion device is equal to or greater than the Pdcp total value, and the AC power system conversion Reducing the Pdcn total value so that the Pi maximum possible value of the apparatus is equal to or greater than the Pdcn total value.

  (38) Furthermore, the computer program of the present invention is an apparatus for performing power supply and demand control in a DC distribution system that can cope with an excess or shortage of power in a DC distribution line by a reverse power flow or a forward power flow in an AC power system. A computer program for causing a computer to function, the step of reducing the Pdcp total value so that a difference obtained by subtracting the Pdcp total value from the Po maximum possible value of the AC power system converter is equal to or greater than a first threshold value. And reducing the Pdcn total value so that a difference obtained by subtracting the Pdcn total value from the Pi maximum possible value of the AC power system converter is equal to or greater than a second threshold value.

(39) to (41) The power supply and demand control method of the present invention is a power supply and demand control method performed in the DC power distribution system described in the above (10) to (32).
Therefore, the power supply and demand control method of the present invention has the same effects as the DC power distribution system described in the above (10) to (32).

  (39) Specifically, the power supply and demand control method of the present invention is capable of dealing with an excess or shortage of power in the DC distribution line by means of reverse power flow or forward power flow in the AC power system. In the control method, when the voltage of the DC distribution line falls outside the predetermined range from the standard value, the Pdcp total value or the Pdcn total value is reduced so that the voltage of the DC distribution line falls within the predetermined range. It is characterized by doing.

  (40) The power supply / demand control method of the present invention is a control method for power supply / demand in a DC distribution line that can cope with an excess or shortage of power in the DC distribution line by a reverse power flow or a forward power flow in the AC power system. Then, the Pdcp total value is reduced so that the Po maximum possible value of the AC power system converter is equal to or greater than the Pdcp total value, and the Pi maximum possible value of the AC power system converter is the Pdcn total value. The Pdcn total value is reduced so as to be as described above.

  (41) Further, the power supply / demand control method of the present invention is a control method for power supply / demand in a DC distribution line, which can cope with an excess or shortage of power in a DC distribution line by a reverse power flow or a forward power flow in an AC power system. The Pdcp total value is reduced so that a difference obtained by subtracting the Pdcp total value from the Po maximum possible value of the AC power system conversion device is equal to or greater than a first threshold, and Pi of the AC power system conversion device The Pdcn total value is reduced so that a difference obtained by subtracting the Pdcn total value from the maximum possible value is equal to or greater than a second threshold value.

  As described above, according to the present invention, the voltage of the DC distribution line can be reliably stabilized.

1 is an overall configuration diagram of a DC power distribution system according to an embodiment of the present invention. It is a functional block diagram of the DC / DC converter for power generators. It is a functional block diagram of the DC / AC converter for AC power systems. It is a functional block diagram of the DC / DC converter for DC load devices. It is a functional block diagram of the DC / AC converter for AC load devices. It is a functional block diagram of a branch device for a DC load device or a branch device for an AC load device under a non-system. It is a functional block diagram of a DC load device or an AC load device under the system. It is a functional block diagram of the branch device for alternating current load apparatuses under a system. It is a functional block diagram of the AC load device under the system. It is explanatory drawing which shows the power supply-and-demand situation under the control of the DC / AC converter for AC power systems. It is explanatory drawing which shows the power supply-and-demand condition under the control of the DC / AC converter for alternating current power systems in the case of Psfb maximum possible value. It is a graph which shows the change of the electric power in the front-and-back stage of the DC / AC converter for AC load apparatuses, an electric current, and a voltage. It is a graph which shows an example of the time change of Vdc of an electric power excess state. It is a graph which shows an example of the time change of Vdc of a power shortage state. It is explanatory drawing which shows the power supply-and-demand situation in the state 1 of FIG. It is explanatory drawing which shows the power supply-and-demand situation in the state 2 of FIG. It is explanatory drawing which shows the power supply-and-demand situation in the state 3 of FIG. It is explanatory drawing which shows the power supply-and-demand situation in the state 4 of FIG. It is explanatory drawing which shows the power supply-and-demand situation in the state 5 of FIG. It is a flowchart of the electric power supply-and-demand control by a system management apparatus. It is a flowchart which shows the specific example of 1st supply-and-demand control. It is a flowchart which shows the specific example of 2nd supply-and-demand control. It is a table | surface which shows an example of a PdcpPals total value reduction list. It is a table | surface which shows an example of a PdcnPals total value reduction list. It is a flowchart which shows the specific example of the reduction process (RDp) of PdcpPals total value. It is a flowchart which shows the specific example of the reduction process (RDn) of PdcnPals total value. It is a flowchart which shows the specific example of "operation execution" (DLp) of the present line of PdcpPals total value reduction list. It is a flowchart which shows the specific example of "operation cancellation" (CLp) of the present line of the PdcpPals total value reduction list. It is a flowchart which shows the specific example of "operation execution" (DLn) of the present line of PdcnPals total value reduction list | wrist. It is a flowchart which shows the specific example of "operation cancellation" (CLn) of the present line of PdcnPals total value reduction list. It is explanatory drawing which shows the example of execution of reduction of PdcpPals total value. It is explanatory drawing which shows the execution example of reduction of PdcnPals total value. It is a whole lineblock diagram of the direct-current power distribution system concerning a 2nd embodiment of the present invention. It is a functional block diagram of the DC / DC converter for power storage devices. It is explanatory drawing which shows the power supply-and-demand situation in the state 1 of FIG. It is explanatory drawing which shows the power supply-and-demand situation in the state 2 of FIG. It is explanatory drawing which shows the power supply-and-demand situation in the state 3 of FIG. It is explanatory drawing which shows the power supply-and-demand situation in the state 4 of FIG. It is explanatory drawing which shows the power supply-and-demand situation in the state 5 of FIG. It is a table | surface which shows an example of a PdcpPals total value reduction list. It is a table | surface which shows an example of a PdcnPals total value reduction list. It is explanatory drawing which shows the example of execution of reduction of PdcpPals total value. It is explanatory drawing which shows the execution example of reduction of PdcnPals total value.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Overall system configuration]
FIG. 1 is an overall configuration diagram of a DC power distribution system according to an embodiment of the present invention.
The direct current distribution system according to the present embodiment is a small-scale power system that distributes generated power or commercial power to a relatively narrow range. As shown in FIG. 1, the direct current distribution line 1 and the DC / DC converter 2 are used. , 4, DC / AC converters 5, 13, power generator 6, branch devices 8, 9, 15, DC load device 10, AC load devices 11, 16, AC power system 14, and system management device 12.

In this specification, each “conversion device” given the reference sign “2, 4, 5, 13” in FIG. 1 is identified only by the reference sign (for example, “conversion device 2”). In some cases, the use of each of the conversion devices 2, 4, 5, and 13 is referred to with a prefix as follows.
2: “DC / DC converter 2 for power generator” or “converter 2 for generator”
4: "DC / DC converter 4 for DC load device" or "DC load device converter 4"
5: “DC / AC converter 5 for AC load device” or “AC device 5”
13: “AC / DC converter for AC power system 13” or “AC power system converter 13”

In addition, each “branching device” given the reference sign “8, 9, 15” in FIG. 1 may be identified only by the reference sign (for example, “branching device 8”). In some cases, the use of each branching device 8, 9, 15 is referred to with a prefix.
8: “Branch device for DC load device 8”
9: “Branch device for AC load device 9”
15: “Branch device for AC load device 15”

Further, for the branch device 15 and the AC load device 16 directly connected to the AC power system 14 without going through the DC distribution line 1, the branch device 15 under the “system” and the AC load under the “system” Sometimes referred to as device 16.
Similarly, with respect to the branch device 9 and the AC load device 11 that are indirectly connected to the AC power system 14 via the DC distribution line 1 and are not under the system, the branch device 9 that is “under the system” and the “under the system” The AC load device 11 may be called.

Among the devices included in the system, the power generation device 6 includes a power generation device using natural energy and a power generation device for power supply and demand control.
Examples of the former include a solar power generator and a wind power generator. Examples of the latter include a fuel cell and an internal combustion engine generator that can also be used as a means for power supply and demand control when power is insufficient. In addition, when the electric power generating apparatus 6 is an alternating current output, the rectifier for connecting with the DC / DC converter 2 for electric power generating devices is contained inside.

The power generator 6 is connected to the DC distribution line 1 via the DC / DC converter 2 for power generator.
The power generator DC / DC converter 2 includes a unidirectional step-up chopper circuit. The step-up chopper circuit boosts the output voltage (for example, DC 80 to 300 V) of the power generator 6 and supplies power to the DC distribution line 1.

The AC power system 14 is composed of an AC distribution board to which AC commercial power of 50 to 60 Hz, for example, is supplied from the outside.
The AC power system 14 is connected to the DC power distribution line 1 via the AC power system DC / AC converter 13. The AC power system DC / AC converter 13 includes, for example, a bidirectional inverter circuit. The bidirectional inverter circuit boosts its output voltage to supply power to the DC distribution line 1 during the forward flow of the AC power system 14, and also supplies the power to the DC distribution line 1 during the reverse flow of the AC power system 14. The output voltage is reduced to supply power to the AC power system 14.

The DC load device 10 and the AC load devices 11 and 16 include, for example, ordinary load devices such as generally used home appliances and load devices for power supply and demand control.
Examples of the latter include electric water heaters, EVs (electric vehicles), PHVs (plug-in hybrid vehicles), and the like, and these load devices are also used as means for power supply and demand control when power is excessive.

The DC load device branch device 8 is formed of, for example, a distribution board, a table tap, or the like. In the example of FIG. 1, the branch device 8 is connected in multiple stages. However, a single-stage configuration may be used, and the DC load device 10 may be directly connected to the DC / DC converter 4 for the DC load device without the branch device 8.
The DC load device 10 is connected to the DC / DC converter 4 for DC load device via the branch device 8 or directly. The DC load device DC / DC conversion device 4 includes a unidirectional step-down chopper circuit. The step-down chopper circuit steps down the output voltage of the DC distribution line 1 and applies it to the DC load device 10. The rated voltage of the DC load device 10 is various, for example, DC12V, 24V, 48V, and 300V.

For example, a plurality of devices such as a single-phase 100V, a single-phase 200V, and a three-phase 200V can be adopted as the branch devices 9 and 15 for AC load devices. In the example of FIG. 1, the branching devices 9 and 15 are also connected in multiple stages. However, a single-stage configuration may be used, and the AC load devices 11 and 16 are directly connected to the DC / AC converters 5 and 13 without the branching devices 9 and 15. Also good.
The AC load devices 11 and 16 are connected to the DC / AC conversion devices 5 and 13 via the branch devices 9 and 15 or directly.
The DC / AC conversion device 5 for AC load device includes a one-way inverter circuit. The one-way inverter circuit converts the DC power of the DC distribution line 1 into AC power and supplies it to the AC load device 11.

  The DC distribution line 1 of this embodiment is operated with a rated voltage of DC 360V. Capacitors are respectively provided on the DC distribution line 1 side of the respective converters 2, 4, 5, and 13, and the capacitance on the DC distribution line 1 side is approximately the total value of the capacitors. The capacitance per each conversion device 2, 4, 5, 13 is, for example, about 3 mF.

[System management device]
The system management device 12 of this embodiment has a communication function for exchanging information with all of the conversion devices 2, 4, 5, and 13, and based on information acquired from the conversion devices 2, 4, 5, and 13 Control power supply and demand in the system.
In addition, when the power generation device 6, the branching devices 8, 9, 15 or the load devices 10, 11, 16 are devices capable of power control, the system management device 12 uses one of them for power supply / demand control in the system. Exchange information with departments or all.

Furthermore, the system management device 12 can exchange information with the AC power system 14 through communication.
In this case, the system management device 12 and the AC power system 14 may exchange information by direct communication, or may exchange information by communication via the DC / AC conversion device 13 for AC power system.

That is, a device capable of exchanging information with the system management device 12 can perform communication, power measurement, power control, and the like, and functions as a power supply / demand control execution unit by the system management device 12.
As a communication method with the system management apparatus 12, for example, wired or wireless communication such as Ethernet (registered trademark), wireless LAN, and PLC (Power Line Communication) is used.

  The system management device 12 includes, as information necessary for power supply and demand control, input power Pi from the DC / DC converter 2 for the power generator to the DC distribution line 1, and DC / DC converter 4 for the DC load device from the DC distribution line 1. , Output power Po to the AC load device DC / AC converter 5, input / output power Pio between the DC distribution line 1 and the AC power system DC / AC converter 13, load power Po of the AC load device 16 under the system (= Pals) is acquired.

  The system management device 12 acquires the total value of the input power Pi acquired from the DC / DC converter 2 for the power generator, the DC / DC converter 4 for the DC load device, and the DC / AC converter 5 for the AC load device. The power generation amount of the power generation device 6 is adjusted by the power generation device DC / DC converter 2 so that the deviation from the total value of the output power Po is within a predetermined range, or the load devices 10, 11, 16, and the branch device 8 are adjusted. , 9, 15, DC / DC converter 4 for DC load device or DC / AC converter 5 for AC load device is de-paralleled, or load power is adjusted by load devices 10, 11, 16 The power supply / demand control is performed to balance the power supply / demand in the system. Details of this control will be described later.

[Parameter definition]
Prior to description of power control performed independently by the DC / DC conversion device 2 for power generation apparatus and the DC / AC conversion device 13 for AC power system, definitions of parameters necessary for the description will be described for each device.
(1) Parameters relating to the DC distribution line 1 Vdc: the voltage of the DC distribution line 1.
Idci: current input to the DC distribution line 1
Idco: current output from the DC distribution line 1
Idcio: Idci or Idco.
Pi: Electric power input to the DC distribution line 1.
Po: Electric power output from the DC distribution line 1.
Pio: It is Pi or Po.

Pdcn total value: “insufficient” power of the DC distribution line 1, and this power is represented by the following equation.
Pdcn total value = Po total value of DC / DC converter 4 for DC load device
+ Po total value of DC / AC converter 5 for AC load device
-Pi total value of DC / DC converter 2 for power generators

When the total Pi value of the DC / AC conversion device 13 for AC power system is equal to or less than the total Pi value of the maximum possible value of the DC / AC conversion device 13 for AC power system, the following equation is established.
Pdcn total value = Pi total value of DC / AC conversion device 13 for AC power system Since the above equation is a relational expression regarding the maximum Pi value of DC / AC conversion device 13 for AC power system, Ts (AC It is based on an average value for each period.

Pdcp aggregate value: “excess” power of the DC distribution line, and this power is expressed by the following equation.
Pdcp total value = Pi total value of DC / DC converter 2 for power generator
-Po total value of DC / DC converter 4 for DC load device
-Po total value of DC / AC converter 5 for AC load devices The Pdcp total value is opposite in sign to the above insufficient power. That is, Pdcp total value = −Pdcn total value.

When the total Po value of the DC / AC conversion device for AC power system 13 is equal to or less than the total value of Po maximum possible values of the DC / AC conversion device for AC power system 13, the following equation is established.
Pdcp total value = Po total value of DC / AC converter 13 for AC power system Since the above equation is a relational expression regarding the Po maximum possible value of DC / AC converter 13 for AC power system, Ts (AC It is based on an average value for each period.

Pdcnp total value: Pdcn total value or Pdcp total value.
Cdc: capacitance of the capacitor on the DC distribution line 1 side of each converter.
Cdc total value: Total value of Cdc. It becomes substantially the same as the electrostatic capacity of the DC distribution line 1.

(2) Parameters relating to the power generation device 6 Pg: generated power of the power generation device 6.
If a slight loss due to conversion is subtracted from Pg, it becomes Pi of the DC / DC converter 2 for power generator, and Pg and Pi of the DC / DC converter 2 for generator are almost equal.
Pg maximum possible value: Maximum generated power that can be generated by the power generation device 6.
Due to the control of the DC / DC converter 2 for the power generator, the actual generated power Pg becomes less than the maximum possible value of Pg, and the Pi of the actual DC / DC converter 2 for the power generator is also the DC / DC converter 2 for the power generator. Pi is less than the maximum possible value.

The maximum possible value of Pg can vary depending on conditions such as the weather.
If a slight loss due to conversion is subtracted from the maximum possible Pg value, it becomes the maximum Pi possible value of the DC / DC converter 2 for the power generator, and the maximum possible Pg value and the maximum Pi value of the DC / DC converter 2 for the power generator Are almost equal.
Vg: a terminal voltage of the power generator 6.
Ig is the output current of the power generator 6.

(3) Parameters relating to the DC load device 10 or the DC load device branch device 8 Pdl: The load power of the DC load device 10.
On the branch side of the branch device for DC load device 8, the total load power of all the DC load devices 10 under the branch is obtained. On the non-branch side of the branch device 8 for DC load device, all of the branches under the branch device 8 are obtained. It becomes the total value of the load power of the DC load device 10.

  When a slight loss due to conversion is subtracted from Po of the DC / DC converter 4 for DC load device, it is directly connected to Pdl of the DC load device 10 directly connected to the DC / DC converter 4 or to the DC / DC converter 4 This is the total value of Pdl on the non-branch side of the branch device 8 for the DC load device, that is, Pdl of all the DC load devices 10 under the branch device 8, and the Pdl of the DC load device 10 or the branch device for the DC load device 8 Pdl on the non-branching side and Po of the DC / DC converter 4 are substantially equal.

Moreover, when a slight loss due to conversion is subtracted from Po of the DC / DC conversion device 4 for DC load device, the total value of Pdl of all DC load devices 10 under the DC / DC conversion device 4 is obtained. The value and Po of the DC / DC converter 4 are substantially equal.
Thus, under the direct current load device DC / DC conversion device 4, the direct current load device branch device 8 is connected in a tree shape, and the terminal is the direct current load device 10, and Po of the DC / DC conversion device 4. Are distributed as Pdl of the branch device 8 and the DC load device 10.

That is, Pdl at various points of the DC load device branch device 8 and the DC load device 10 constitutes a part of Po of the DC load device DC / DC converter 4 under the branch device 8 and the DC load device 10. And it can be treated as a concept equivalent to Po.
Po: Synonymous with Pdl. For the above reasons, the term Po is sometimes used in the same meaning as Pdl.
Vdl: a terminal voltage of the DC load device 10 or the DC load device branch device 8.
Idl: Load current of the DC load device 10 or the DC load device branch device 8.

(4) Parameters related to AC load device 11 under non-system or branch device 9 for AC load device Pal: Load power of AC load device 11 under non-system.
In addition, on the branch side of the branch device 9 for the AC load device not under the system, the total load power of all the AC load devices 11 under the branch is obtained, and the non-branch side of the branch device 9 for the AC load device under the system is not present. Then, it becomes the total value of the load power of all the AC load devices 11 under the branch device 9.

  When a slight loss due to conversion is subtracted from Po of the DC / AC converter 5 for AC load device, it is directly connected to Pal of the AC load device 11 directly connected to the DC / AC converter 5 or to the DC / AC converter 5 This is the total value of Pal on the non-branch side of the branch device 9 for AC load device, that is, Pal of all AC load devices 11 under the branch device 9, and Pal of the AC load device 11 or non-branch of the branch device 9 The side Pal and the Po of the DC / AC converter 5 are substantially equal.

Further, when a slight loss due to conversion is subtracted from Po of the DC / AC conversion device 5 for AC load device, it becomes the total value of Pal of all AC load devices 11 under the DC / AC conversion device 5, and the total The value and Po of the DC / AC converter 5 are substantially equal.
In this way, under the control of the DC / AC conversion device 5 for the AC load device, the branch device 9 for the AC load device is connected in a tree shape, and the terminal is the AC load device 11, and the Po of the DC / AC conversion device 5 is the Po. Are distributed as Pal of the branch device 9 and the AC load device 11.

That is, Pal in each place of the branch device 9 for the AC load device and the AC load device 11 constitutes a part of Po of the DC / AC converter 5 for the AC load device under the control of the branch device 9 and the AC load device 11. And it can be treated as a concept equivalent to Po.
Po: Synonymous with Pal. Because of the above, the term Po is sometimes used in the same meaning as Pal.
Val: The terminal voltage of the AC load device 11 or the branch device 9 for AC load device under the non-system.
Ial: The load current of the AC load device 11 or the branch device 9 for AC load device under the non-system.

(5) Parameters relating to the AC load device 16 or the AC load device branch device 15 under the system Pals: Load power of the AC load device 16 under the system.
Further, on the branch side of the branch device 15 for the AC load device under the system, the total load power of all the AC load devices 16 under the branch is obtained, and on the non-branch side of the branch device 15 for the AC load device under the system. This is the total load power of all AC load devices 16 under the branch device 15.

  When a slight loss due to conversion is subtracted from Po of the DC / AC converter 13 for AC power system, the AC load connected directly to the DC / AC converter 13 when the power flow to the AC power system 14 is zero. It becomes the total value of the Pals of the non-branch side of the branching device 15 for the AC load device directly connected to the Pals of the device 16 or the DC / AC converter 13, that is, the Pals of all the AC load devices 16 under the branching device 15 Pals of the AC load device 16 or Pals on the non-branch side of the branch device 15 and Po of the DC / AC converter 13 are substantially equal.

Further, when a slight loss due to conversion is subtracted from Po of the DC / AC converter 13 for AC power system, when the power flow with the AC power system 14 is 0, all of the subordinates of the DC / AC converter 13 The total value of Pals of the AC load device 16 is equal to the Po of the DC / AC converter 13.
In this way, under the control of the AC power system DC / AC conversion device 13, the AC load device branch device 15 is connected in a tree shape, and the terminal is the AC load device 16, and the Po of the DC / AC conversion device 13 is Po. Is distributed as Pals of the branch device 15 and the AC load device 16 except for the tidal power with the AC power system 14.

That is, Pals in various places of the branch device 15 for the AC load device and the AC load device 16 constitute a part of Po of the DC / AC converter 13 for the AC load device under the branch device 15 and the AC load device 16. And it can be treated as a concept equivalent to Po.
Po: Synonymous with Pals. Because of the above, the term Po is sometimes used in the same meaning as Pals.
Vals: The terminal voltage of the AC load device 16 or the branch device for AC load device 15 under the system.
Ials: The load current of the AC load device 16 or the branch device for AC load device 15 under the system.

Pals subtotal value: The total value of the load power Pals of all the AC load devices 16 under the system for one DC / AC converter 13 for AC power system of interest.
Pals total value: It is the total value of the load powers Pals of all AC load devices 16 under the system for all AC / power system DC / AC converters 13 in the system.
Therefore, in a system where only one Pals total value = Σ (Pals subtotal value) and only one DC / AC converter 13 for AC power system exists, Pals total value = Pals subtotal value.
A method for calculating the Pals subtotal value will be described later.

(6) Parameters relating to AC power system 14 Psf: Forward power of AC power system 14.
Psb: reverse power flow power of the AC power system 14.
Psfb: Psf or Psb.
Psf maximum possible value: The maximum forward power that the AC power system 14 can “forward flow”.
Psb maximum possible value: The maximum reverse power that the AC power system 14 can “reverse flow”.
The Psf maximum possible value and the Psb maximum possible value will be described later.

Vs: A terminal voltage of the AC power system 14.
Isf: The forward power flow current of the AC power system 14.
Isb: a reverse flow current of the AC power system 14.
Isfb: Isf or Isb.
fs: AC frequency.
Ts: the period of alternating current. Therefore, Ts = 1 / fs.

[Calculation method of Pals subtotal value]
The system management device 12 according to the present embodiment acquires the “Pals subtotal value” of the AC load device 16 under the system by one of the following calculation methods 1 and 2.
When there are a plurality of AC / power system DC / AC conversion devices 13, the system management device 12 calculates a “Pals subtotal value” for each conversion device 13, and totals the obtained Pals subtotal values. “Pals total value” is calculated.

Calculation method 1:
When the system management device 12 can communicate with the branch device 15 or the AC load device 16 under the system, the system management device 12 does not overlap the pals of the devices 15 and 16 acquired by communication with the devices 15 and 16. To calculate the Pals subtotal value.
For example, if it is Pals of the AC load device 16 directly connected to the DC / AC converter 13 for AC power system or Pals on the non-branch side of the branch device 15 for AC load device connected directly to the DC / AC converter 13 The Pals becomes the Pals subtotal value. Further, the sum of the pals of all the alternating current load devices 16 under the direct current power system DC / AC conversion device 13 is the Pals subtotal value.

  Furthermore, when the AC power system DC / AC conversion device 13 is under control of the AC load device branching device 15 and the AC load device 16 are cut so as to cross the tree, the total of the cut points is the Pals subtotal value. Become.

Calculation method 2:
Otherwise, that is, when the system management device 12 cannot communicate with the branching device 15 and the AC load device 16 under the system, the system management device 12 is directly connected from the AC power system 14 or the DC / AC converter for AC power system. 13, Psfb is acquired via 13, Pio of the conversion device 13 is acquired from the conversion device 13, and the Pals subtotal value is calculated from these values as follows, for example.

FIG. 10 is an explanatory diagram showing the power supply / demand situation under the control of the DC / AC converter 13 for AC power system. Hereinafter, the calculation method 2 will be described with reference to FIG.
When Psf ≧ 0 (forward current) and Pi ≧ 0 (the upper diagram in FIG. 10)
In this case, if a slight loss due to conversion is subtracted from (Psf−Pi), a Pals subtotal value is obtained, and both are substantially equal. Therefore, the system management apparatus 12 calculates the Pals subtotal value by the following equation.
Pals subtotal value≈Psf−Pi

When Psf ≧ 0 (forward tide) and Po ≧ 0 (middle diagram of FIG. 10)
In this case, if a slight loss due to conversion is subtracted from (Po + Psf), a Pals subtotal value is obtained, and both are substantially equal. Therefore, the system management apparatus 12 calculates the Pals subtotal value by the following equation.
Pals subtotal value ≒ Po + Psf

When Psb ≧ 0 (reverse power flow) and Po ≧ 0 (lower diagram in FIG. 10)
In this case, if a slight loss due to conversion is subtracted from (Po−Psb), a Pals subtotal value is obtained, and both are substantially equal. Therefore, the system management apparatus 12 calculates the Pals subtotal value by the following equation.
Pals subtotal value ≒ Po-Psb

In the present embodiment, the AC power system DC / AC conversion device 13 acquires the Pals subtotal value for the AC load device 16 under its control from the system management device 12 by communication, or the above calculation method It can be acquired by any one of the methods 1 and 2.
That is, when the DC / AC conversion device 13 for AC power system can communicate with the branch device 15 or the AC load device 16 under the system, each device 15, 16 acquired by communication with the devices 15, 16 is used. The Pals subtotal value is calculated by summing the 16 Pals so that there is no overlap.

For example, the pals of the AC load device 16 under the system directly connected to the DC / AC converter 13 or the non-branch side pals of the branch device 15 for the AC load device under the system directly connected to the DC / AC converter 13 If so, the corresponding Pals becomes the Pals subtotal value.
Further, the sum of the pals of all the alternating current load devices 16 under the direct current power system DC / AC conversion device 13 is the Pals subtotal value.
Furthermore, when the AC power system DC / AC conversion device 13 is under control of the AC load device branching device 15 and the AC load device 16 are cut so as to cross the tree, the total of the cut points is the Pals subtotal value. (Calculation method 1)

  Further, when the DC / AC conversion device 13 for AC power system cannot communicate with the branch device 15 and the AC load device 16 under the system, it acquires Psfb directly from the AC power system 14 or via the system management device 12. Then, the Pals subtotal value is calculated from its own Pio like the calculation method 2 described above.

[Psf maximum possible value and Psb maximum possible value]
FIG. 11 is an explanatory diagram showing the relationship between the Psfb maximum possible value, the Pals subtotal value, and the Pio maximum possible value.
Since the Pals subtotal value is determined only by the operation of the AC load device 16 and the DC / AC converter 13 cannot be controlled, the Pio maximum possible value of the DC / AC converter 13 is the maximum Psfb possible of the AC power system 14. The value needs to be calculated in consideration of the Pals subtotal value.
Here, since the power based on the AC power system 14 is a problem, Psfb assumes an average value for each Ts. Therefore, the relational expressions regarding the maximum possible value of Psfb, the maximum possible value of Pi of the DC / AC converter 13 and the minimum possible value of Po are also based on an average value for each Ts.

The upper part of FIG. 11 shows the power supply / demand situation when Psf ≧ 0 (forward flow) and Psf maximum possible value ≧ Pals subtotal value.
As shown in the upper diagram of FIG. 11, when Psf maximum possible value ≧ Pals subtotal value, the maximum power that can be input from the AC power system 14 to the DC / AC converter 13 is (Psf The maximum possible value−Pals subtotal value), and the actual (Psf−Pals subtotal value) becomes less than (Psf maximum possible value−Pals subtotal value) under the control of the DC / AC converter 13, and the actual DC / AC Pi of the conversion device 13 is also equal to or less than the Pi maximum possible value of the conversion device 13.

In this case, if a slight loss due to conversion is subtracted from (Psf maximum possible value−Pals subtotal value), the Pi maximum possible value of the DC / AC converter 13 for AC power system is obtained, and both are substantially equal. Therefore, the following formula is established.
Psf maximum possible value−Pals subtotal value≈Pi maximum possible value of the converter 13

The middle diagram of FIG. 11 shows the power supply / demand situation when Psf ≧ 0 (forward flow) and Psf maximum possible value ≦ Pals subtotal value.
As shown in the middle diagram of FIG. 11, when Psf maximum possible value ≦ Pals subtotal value, considering the Pals subtotal value, instead of inputting power from the AC power system 14 to the DC / AC converter 13, DC / The power of (Pals subtotal value−Psf maximum possible value) must be output from the AC conversion device 13, and the actual (Pals subtotal value−Psf) becomes (Pals subtotal value) under the control of the DC / AC conversion device 13. −Psf maximum possible value), and the actual Po of the DC / AC converter 13 is also equal to or greater than the Po minimum possible value of the converter 13.

  In this case, if a slight loss due to conversion is subtracted from the Po minimum possible value of the DC / AC converter 13 for the AC power system, the result is (Pals subtotal value−Psf maximum possible value), which are substantially equal.

  In this case, for convenience, a negative value is recognized for Pi, and when Po = −Pi, Po minimum possible value = −Pi maximum possible value, the relationship that Pi ≦ Pi maximum possible value must be satisfied, Pi is a negative value. -Pi = Po.gtoreq.-Pi maximum possible value = Po minimum possible value. In this case, Psf maximum possible value.ltoreq.Pals subtotal value, and Psf maximum possible value.gtoreq.Pals subtotal value. It can be expressed by the same relational expression of Psf maximum possible value, Pals subtotal value, and Pi maximum possible value.

That is, “the actual (Psf−Pals subtotal value) becomes less than (Psf maximum possible value−Pals subtotal value) under the control of the DC / AC conversion device 13, and the actual Pi of the DC / AC conversion device 13 is also converted. In the expression “below the Pi maximum possible value of the device 13”, when each numerical value is a negative value, if it is a positive value, “actual (Pals subtotal value−Psf) under the control of the DC / AC conversion device 13”. Is equal to or greater than (Pals subtotal value−Psf maximum possible value), and −Pi = Po of the actual DC / AC converter 13 is also equal to or greater than −Pi maximum possible value of the converter 13 = Po minimum possible value ”. Become.
In addition, the expression “if the slight loss due to conversion is subtracted from (Psf maximum possible value−Pals subtotal value), it becomes the Pi maximum possible value of the DC / AC converter 13 for AC power system, and both are substantially equal.” When each numerical value is a negative value, if it is set to a positive value, “the maximum potential value of −Pi of the DC / AC converter 13 for AC power system 13 = the minimum possible value of Po is subtracted by a slight loss due to conversion ( (Pals subtotal value−Psf maximum possible value) and both are substantially equal. ”
Further, in the expression “Psf maximum possible value−Pals subtotal value≈Pi maximum possible value of the conversion device 13”, if each numerical value is a negative value, if it is a positive value, “Pals subtotal value−Psf maximum possible value≈conversion -Pi maximum possible value of device 13 = Po minimum possible value ".

  The “Psf maximum possible value” may fluctuate depending on the power supply / demand situation of the AC power system 14, but when such fluctuation occurs, the AC power system 14 directly or via the DC / AC converter 13. The system management device 12 is notified in advance.

The lower part of FIG. 11 shows the power supply and demand situation when Psb ≧ 0 (reverse power flow).
As shown in the lower diagram of FIG. 11, in this case, when considering the Pals subtotal value, the maximum power that can be output from the DC / AC converter 13 to the AC power system 14 is (Psb maximum possible value + Pals subtotal value). Thus, under the control of the DC / AC converter 13, the actual (Psb + Pals subtotal value) is less than (Psb maximum possible value + Pals subtotal value), and Po of the actual DC / AC converter 13 is also the Po maximum of the apparatus 13. Less than possible value.

In this case, if a slight loss due to conversion is subtracted from the maximum Po value of the DC / AC conversion device 13 for the AC power system, the result is (Psb maximum possible value + Pals subtotal value), and both are substantially equal. Therefore, the following formula is established.
Psb maximum possible value + Pals subtotal value≈Po maximum possible value of converter 13

  Note that the “Psb maximum possible value” may also vary depending on the power supply / demand situation of the AC power system 14, but when such a variation occurs, the AC power system 14 directly or via the DC / AC converter 13. The system management device 12 is notified in advance.

[Vrip ripple]
FIG. 12 is a graph showing changes in power, current, and voltage before and after the DC / AC converter 13 for AC power system.
That is, the left side of FIG. 12 is a graph showing changes in power, current and voltage on the AC power system 14 side of the converter 13, and the right side of FIG. 12 is power and current on the DC distribution line 1 side of the converter 13. It is a graph which shows the change of voltage.

As shown in FIG. 12, Psfb (t) pulsates at a frequency of 2fs because it is an alternating current, and Pio (t) that is substantially equal to it pulsates at a frequency of 2fs.
Pio (t) = Pio (1 + cos (4π · fs · t))
Here, Pio (t) = Vdc (t) × Idcio (t), and Vdc (t) is substantially DC, so that Idcio (t) also pulsates at a frequency of 2 fs.
Idcio (t) = (Pio / Vdc) (1 + cos (4π · fs · t))
In addition, the DC distribution line 1 is an aggregate of capacitors on the DC distribution line 1 side of the respective converters 2, 4, 5, and 13 in terms of electric circuit, and the capacitance is approximately the total value thereof. Cdc total value.

Therefore, the following differential equation is established between Vdc (t) and Idcio (t), and Vdc (t) of the DC distribution line 1 is an AC frequency fs of the AC power system 14 at a frequency of 2 fs. A pulsating component (ripple) is generated.
Idcio (t) = constant + Cdc total value × ΔVdc (t) / Δt
For this reason, if it is going to suppress the ripple of Vdc (t), the electric current Isfb (t) of the alternating current power system 14 will be distorted, and it will become impossible to connect to the alternating current power system 14.

Here, the ripple peak value is “Vdcr” (where Vdc >> Vdcr),
When Vdc (t) = Vdc + Vdcr · sin (4π · fs · t) is substituted into the above differential equation,
Idcio (t)
= Constant + 4π · fs · Cdc total value · Vdcr · cos (4π · fs · t).
From the comparison of the above two Idcio (t), Pio / Vdc = 4π · fs · Cdc total value · Vdcr,
Vdcr = Pio / (4π · fs · Cdc total value · Vdc).

Further, when there are a plurality of AC power system DC / AC converters 13, the phases of the AC power system 14 are synchronized, and all the AC power system DC / AC converters 13 are operating at the Pio rated value. Sometimes Vdcr is maximized, and the maximum value is given by
Vdcr maximum value = Pio rated value total value of DC / AC converter 13 for AC power system / (4π · fs · Cdc total value · Vdc target value (standard))

In the above description, harmonics are ignored.
In the above description, for the sake of simplicity, it is assumed that there is no branch device 15 directly under the AC power system DC / AC converter 13. However, the operation related to the current waveform on the AC power system 14 side of the converter 13 is as follows. The same applies when the branch device 15 exists.

[Basic policy for power control in converters]
In this embodiment, the converter 2 for power generators and the converter 13 for alternating current power systems perform the following 1st and 2nd electric power control mutually independently, respectively, The voltage Vdc of the DC distribution line 1 is set to the upper limit It is maintained so that it is below the value and within the range above the lower limit.
It is assumed that Vdc rated value = 360V, Vdc upper limit value = 390V, and Vdc lower limit value = 330V.

In the following, “Vdc target value (extra height)” is, for example, Vdc upper limit value−allowable error δ1 (see FIGS. 13 and 14). When δ1 = 5V, the Vdc target value (extra height) is 385V. It becomes.
Further, the “Vdc target value (standard)” is, for example, a Vdc rated value (= 360 V), and an allowable error ± δ2 (see FIGS. 13 and 14) is recognized. Here, it is assumed that δ2 = 10V.

(First power control): Hereinafter, it is also referred to as “first Vdc control”.
The DC / DC converter 2 for power generator performs power control so that the Vdc of the DC distribution line 1 becomes a “Vdc target value (extra height)” (hereinafter also referred to as “Vdc”).
(Second power control): Hereinafter, it is also referred to as “second Vdc control”.
The DC / AC converter 13 for the AC power system performs power control so that the average value of Vdc of the DC distribution line 1 for each Ts becomes “Vdc target value (standard)” (hereinafter also referred to as “Vdcm”). Do.

In the present embodiment, power control that does not suppress the ripple of Vdc is adopted by setting the control target of the second power control not to Vdc itself (instantaneous value) but to an average value for each Ts of Vdc. Therefore, the total Cdc value on the DC distribution line 1 side is designed so that the maximum value of Vdcr ≦ Vdc target value (standard) × 0.01.
However, the predetermined ratio by which the Vdc target value (standard) is multiplied in order to obtain the allowable ripple range may be selected from a range of approximately 0.01 to 0.03.

In this case, for example, if the concept of realizing the Cdc total value only with the DC / AC converter 13 for AC power system is adopted, each DC / AC converter 13 for AC power system is designed as shown in the following equation. do it.
Cdc / Pio rated value of each DC / AC converter 13 ≧ 1 / (4π · fs · Vdc target value (standard) · (Vdc target value (standard) × about 0.01))
That is,
Cdc / Pio rated value of each DC / AC converter 13 ≧ 1 / (4π · fs · Vdc target value (standard) ² · × about 0.01)

In the present embodiment, as described above, the “Vdc target value (standard)” is the Vdc rated value.
However, it is necessary that Vdc target value (standard) −allowable error δ2−Vdcr maximum value ≧ Vdc lower limit value of Vdc control of DC / AC converter 13 for AC power system. When this is not satisfied, it is necessary to set the allowable error δ2 of the Vdc control or the maximum value of Vdcr of the DC / AC converter 13 for AC power system to be smaller.

Furthermore, in the present embodiment, Vdc target value (extra height) = Vdc upper limit value−allowable error δ1 of Vdc control of the DC / DC converter 2 for the power generator. However, in order to give some margin, it is necessary to satisfy the following inequality.
Vdc target value (standard) + tolerance δ2 + Vdcr maximum value <Vdc target value (extra height)
If this is not satisfied, it is necessary to set the Vdc control allowable error δ2 or the maximum value of Vdcr of the DC / AC converter 13 for AC power system to a smaller value.

As an example, assuming that Vdc rated value = 360V, Vdc upper limit value = 390V, Vdc lower limit value = 330V, δ1 = 5V, and δ2 = 10V, the Vdc target value (extra height) is 385V, and the Vdc target value (standard) Is 360 V, and the maximum value of Vdcr is 360 V × 0.01 = 3.6 V.
In this case, Vdc target value (standard) + δ2 + Vdcr maximum value <less than Vdc target value (extra height), and Vdc target value (standard) −δ2−Vdcr maximum value> Vdc lower limit value.
Further, in order to satisfy the maximum value of Vdcr, if the idea of realizing the Cdc total value only by the AC power system DC / AC converter 13 is adopted, each AC power system DC / AC The Cdc / Pio rated value of the conversion device 13 may be 1.23 mF / kW or more with fs ≧ 50 Hz.

[Functional configuration of DC / DC converter for power generator]
FIG. 2 is a functional block diagram of the DC / DC converter 2 for the power generator.
As shown in FIG. 2, the DC / DC converter 2 for a power generator according to this embodiment includes, in order from the left in the figure, a transmission / reception unit 21, a measurement unit 22, a storage unit 23, a Pi calculation unit 24, a minimum value selection unit 25, A Pi controller 26, a PWM circuit 27, and a boost chopper circuit 28 are included.

The transmission / reception unit 21 includes a communication interface that communicates with the system management device 12, and the measurement unit 22 measures the current Ig and voltage Vg on the power generation device 6 side, and the current Idci and voltage Vdc on the DC distribution line 1 side. Has sensors.
The storage unit 23 includes a memory that stores setting values notified from the system management apparatus 12 via the transmission / reception unit 21.

In response to an acquisition request from the system management device 12, the transmission / reception unit 21 transmits the values of Vdc and Pi (= Vdc × Idci) acquired from the measurement unit 22 to the system management device 12. Further, the measurement unit 22 passes the value of Vdc to the subsequent Pi calculation unit 24, and passes the measurement values of Vdc, Pi, Vg, and Ig to the subsequent Pi control unit 26.
The storage unit 23 stores the Vdch and Pi limit value notified from the system management apparatus 12, passes the stored Vdch to the Pi calculation unit 24, and passes the Pi limit value to the minimum value selection unit 25.

The Pi calculation unit 24 performs PI control (proportional integral control) on Pi necessary for performing power control in which the value of Vdc input from the measurement unit 22 becomes Vdcch (higher target value) acquired from the storage unit 23. And the calculation result is output to the minimum value selection unit 25.
The minimum value selection unit 25 selects the minimum value from the Pi calculated by the Pi calculation unit 24 and the Pi limit value input from the storage unit 23, and sets the selected minimum value as the “Pi target value”, and the Pi control unit 26.

The Pi control unit 26 calculates the duty ratio necessary for the Pi value input from the measurement unit 22 to become the Pi target value by PI control (proportional integration control), and outputs the calculated value to the PWM circuit 27. To do.
However, if the Pi target value exceeds the Pi maximum possible value, the Pi control unit 26 PI-controls the duty ratio necessary for the Pi value input from the measurement unit 22 to be the Pi maximum possible value ( Calculate by proportional integral control).

The PWM circuit 27 switches the transistors of the boost chopper circuit 28 at the duty ratio calculated as described above.
As a result, the power Pi input to the DC distribution line 1 is within the range of the Pi limit value, or the power value at which Vdc becomes Vdch, or a slight loss due to conversion from the maximum Pg possible value that is the maximum generated power. It is controlled so as to be the smaller power value of Pi maximum possible value obtained by subtracting.

[Functional configuration of DC / AC converter for AC power system]
FIG. 3 is a functional block diagram of the DC / AC converter 13 for AC power system.
As shown in FIG. 3, the DC / AC converter 13 for an AC power system of this embodiment includes a transmission / reception unit 131, a measurement unit 132, a storage unit 133, a Pio calculation unit 134, a Pio control unit 136, in order from the left in the drawing. A PWM circuit 137 and a bidirectional inverter circuit 138 are included.

The transmission / reception unit 131 includes a communication interface that communicates with the system management device 12, the AC power system 14, the subordinate branch device 15, or the AC load device 16, and the measurement unit 132 includes the current Isfb and the voltage Vs on the AC power system 14 side. And sensors for measuring the current Idcio and the voltage Vdc on the DC distribution line 1 side.
The storage unit 133 includes a memory that stores setting values notified from the system management apparatus 12 via the transmission / reception unit 131.

In response to an acquisition request from the system management device 12, the transmission / reception unit 131 transmits the values of Vdc and Pio (= Vdc × Idcio) acquired from the measurement unit 132 to the system management device 12. In addition, the measurement unit 132 passes the value of Vdc to the subsequent stage Pio calculation unit 134, and passes the values of Vdc, Pio, Vs, and Isfb to the subsequent stage Pio control unit 136.
The storage unit 133 stores the Vdcm notified from the system management apparatus 12 and passes the stored Vdcm to the Pio calculation unit 134.
Further, the storage unit 133 notifies the acquisition request for the Psfb maximum possible value, the Pals subtotal value, Po (= Pals), or Psfb to the device having those parameters, and stores the notified parameter in response to the request.

For example, when the storage unit 133 transmits an acquisition request to the system management device 12, the system management device 12 collects the Psfb maximum possible value acquired from the AC power system 14 and the branching device 15 and the AC load device 16. The storage unit 133 is notified of the Pals subtotal value calculated based on Po (= Pals) or Psfb acquired from the AC power system 14.
In addition, when the storage unit 133 transmits an acquisition request to the AC power system 14, the AC power system 14 notifies the storage unit 133 of the Psfb maximum possible value and Psfb held by the storage unit 133.

  Further, when the storage unit 133 transmits an acquisition request to the subordinate branch device 15 or the AC load device 16, the values of Po (= Pals) held by the devices 15 and 16 themselves. Is notified to the storage unit 133.

  Further, the storage unit 133 passes the Psfb maximum possible value notified from the system management device 12 and other devices, and the Pals subtotal value, Po (= Pals) or Psfb, to the Pio control unit 136 at the subsequent stage.

  The Pio calculation unit 134 performs the power control so that the average value for each Ts of Vdc input from the measurement unit 132 becomes Vdcm (standard target value) acquired from the storage unit 133. The average value is calculated by PI control (proportional integral control), and the calculation result is output to the Pio control unit 136 as “Pio target value”.

The Pio control unit 136 calculates a duty ratio necessary for the average value of Pio for each Ts input from the measurement unit 132 to be the Pio target value by PI control (proportional integration control), and the calculated value is PWM. Output to the circuit 137.
However, when the Pio target value exceeds the Pio maximum possible value, the Pio control unit 136 determines the duty ratio necessary for the average value of Pio for each Ts input from the measurement unit 132 to be the Pio maximum possible value. Is calculated by PI control (proportional integral control).

 In addition, when the Pi maximum possible value ≦ 0, the Pio control unit 136 determines that the average value of Po for each Ts is − provided that the Pi target value ≧ 0 or the Po target value ≦ −Pi maximum possible value. The duty ratio necessary to reach the maximum Pi value is calculated by PI control (proportional integration control), and the calculated value is output to the PWM circuit 137.

Here, the Pio control unit 136 calculates “Po maximum possible value” by adding a slight loss due to conversion to (Psb maximum possible value + Pals subtotal value). That is, the Pio control unit 136 calculates the Po maximum possible value by the following equation.
Po maximum possible value = Psb maximum possible value + Pals subtotal value + slight loss due to conversion In the above equation, “slight loss due to conversion” is determined by the internal configuration of the DC / AC converter 13 for AC power system. It should be set to a value (the same applies hereinafter).

Further, the Pio control unit 136 calculates “Pi maximum possible value” by subtracting a slight loss due to conversion from (Psf maximum possible value−Pals subtotal value). That is, the Pio control unit 136 calculates the maximum Pi possible value by the following equation.
Pi maximum possible value = Psf maximum possible value−Pals subtotal value−Slight loss due to conversion

When the Pals subtotal value is not obtained from the system management device 12 or calculated based on Po (= Pals) acquired from the branch device 15 and the AC load device 16, the Pio control unit 136 The Pals subtotal value is calculated by the following calculation method according to the power flow state of the grid 14 and the power state of the own device.
When Psf ≧ 0 (forward current) and Pi ≧ 0:
A value obtained by subtracting a slight loss due to conversion from (Psf−Pi) is defined as a Pals subtotal value. That is, Pals subtotal value≈Psf−Pi.

When Psf ≧ 0 (forward current) and Po ≧ 0:
A value obtained by subtracting a slight loss due to conversion from (Po + Psf) is defined as a Pals subtotal value. That is, Pals subtotal value≈Po + Psf.
When Psb ≧ 0 (reverse power flow) and Po ≧ 0:
A value obtained by subtracting a slight loss due to conversion from (Po−Psb) is defined as a Pals subtotal value. That is, Pals subtotal value≈Po−Psb.

The PWM circuit 137 switches the transistors of the bidirectional inverter circuit 138 at the duty ratio calculated as described above.
Thereby, the electric power Pi input to the DC distribution line 1 is either the electric power at which the average value of Vdc for each Ts becomes Vdcm or the maximum Pi possible value that can be input from the DC / AC converter 13 is smaller. Or the power Po output from the DC distribution line 1 is the power at which the average value of Vdc for each Ts is Vdcm, or the maximum possible Po value that can be output to the DC / AC converter 13 The power value is controlled so as to be smaller.

[Functional configuration of DC / DC converter for DC load device]
FIG. 4 is a functional block diagram of the DC / DC converter 4 for the DC load device.
As shown in FIG. 4, the DC / DC converter 4 for a DC load device according to the present embodiment includes a transmission / reception unit 41, a measurement unit 42, a storage unit 43, a deparallel control unit 44, and a Vdl control unit 45 in order from the left in the figure. , A PWM circuit 46 and a step-down chopper circuit 47.

The transmission / reception unit 41 includes a communication interface that communicates with the system management device 12. The measurement unit 42 includes a current Idl and a voltage Vdl on the DC load device 10 or the DC load device branch device 8 side, and a DC distribution line 1 side. Sensors for measuring current Idco and voltage Vdc are included.
The storage unit 43 includes a memory that stores a setting value notified from the system management apparatus 12 via the transmission / reception unit 41.

In response to an acquisition request from the system management device 12, the transmission / reception unit 41 transmits the values of Vdc and Po (= Vdc × Idco) acquired from the measurement unit 42 to the system management device 12. In addition, the measurement unit 42 passes the Po value to the subsequent-stage solution parallel control unit 44, and passes the measured values of Vdl and Idl to the subsequent Vdl control unit 45.
The storage unit 43 stores the Vdl target value and Po limit value notified from the system management apparatus 12, passes the stored Vdl target value to the Vdl control unit 45, and passes the Po limit value to the solution parallel control unit 44. In addition, the transmission / reception unit 41 passes the disconnection request or parallel request received from the system management apparatus 12 to the solution parallel control unit 44.

The Vdl control unit 45 calculates the duty ratio necessary for the value of Vdl input from the measurement unit 42 to be the Vdl target value acquired from the storage unit 43 by PI control (proportional integration control), and the calculated value Is output to the PWM circuit 46.
The PWM circuit 46 switches the transistor of the step-down chopper circuit 47 at the duty ratio calculated as described above. As a result, the terminal voltage of the DC load device 10 or the DC load device branch device 8 is controlled to be the Vdl target value.

When there is a request for disconnection from the system management device 12, the solution parallel control unit 44 disconnects the subordinate DC load device 10 or the DC load device branch device 8 and when there is a parallel request, The subordinate DC load device 10 or the DC load device branch device 8 is arranged in parallel.
In addition, when the value of Po input from the measurement unit 42 is larger than the Po limit value acquired from the storage unit 43, the solution parallel control unit 44 controls the subordinate DC load device 10 or the DC load device branch device 8. Are separated, and the subordinate direct current load device 10 or the direct current load device branch device 8 is arranged in parallel.

[Functional configuration of DC / AC converter for AC load device]
FIG. 5 is a functional block diagram of the DC / AC converter 5 for an AC load device.
As shown in FIG. 5, the DC / AC conversion device 5 for an AC load device according to this embodiment includes a transmission / reception unit 51, a measurement unit 52, a storage unit 53, a deparallel control unit 54, and a Val control unit 55 in order from the left in the drawing. , A PWM circuit 56 and an inverter circuit 57.

The transmission / reception unit 51 includes a communication interface that communicates with the system management device 12. The measurement unit 52 includes the current Ial and voltage Val on the AC load device 11 or the AC load device branch device 9 side, and the DC distribution line 1 side. Sensors for measuring current Idco and voltage Vdc are included.
The storage unit 53 includes a memory that stores setting values notified from the system management apparatus 12 via the transmission / reception unit 51.

The transmission / reception unit 51 transmits the values of Vdc and Po (= Vdc × Idco) acquired from the measurement unit 52 to the system management device 12 in response to an acquisition request from the system management device 12. In addition, the measurement unit 52 passes the value of Po to the subsequent-stage solution parallel control unit 54, and passes the measurement values of Val and Ial to the subsequent-stage Val control unit 55.
The storage unit 53 stores the Val target value and the Po limit value notified from the system management apparatus 12, passes the stored Val target value to the Val control unit 55, and passes the Po limit value to the solution parallel control unit 54. In addition, the transmission / reception unit 51 passes the disconnection request or parallel request received from the system management device 12 to the solution parallel control unit 54.

The Val control unit 55 calculates a duty ratio necessary for the Val value input from the measurement unit 52 to be the Val target value acquired from the storage unit 53 by PI control (proportional integration control), and the calculated value Is output to the PWM circuit 56.
The PWM circuit 56 switches the transistors of the inverter circuit 57 at the duty ratio calculated as described above. As a result, the terminal voltage of the AC load device 11 or the AC load device branch device 9 is controlled to be the Val target value.

When there is a request for disconnection from the system management device 12, the solution parallel control unit 54 disconnects the subordinate AC load device 11 or the branch device for AC load device 9 and when there is a parallel request, The subordinate AC load device 11 or the branch device 9 for AC load device is arranged in parallel.
In addition, when the value of Po input from the measurement unit 52 is larger than the Po limit value acquired from the storage unit 53, the solution parallel control unit 54 controls the subordinate AC load device 11 or the AC load device branch device 9. Are separated, and the subordinate AC load device 11 or the AC load device branch device 9 is arranged in parallel.

[Functional configuration of branch device for DC load device or branch device for AC load device under non-system]
FIG. 6 is a functional block diagram of the DC load device branch device 8 or the AC load device branch device 9 that is not subordinate to the system.
As shown in FIG. 6, the DC load device branch device 8 or the AC load device branch device 9 that is not subordinate to the system of the present embodiment includes a transmission / reception unit 81, a measurement unit 82, a storage unit 83, and a branch in order from the left in the figure. Each solution parallel control unit 84 is provided.

The transmission / reception unit 81 includes a communication interface that communicates with the system management device 12, and the measurement unit 82 measures the current Idl or Ial and the voltage Vdl or Val for each branch on the load devices 10 and 11 or the branch devices 8 and 9 side. Sensor.
The storage unit 83 includes a memory that stores setting values notified from the system management apparatus 12 via the transmission / reception unit 81.

  The transmission / reception unit 81 responds to an acquisition request from the system management apparatus 12 and determines the value of Po (= Pdl = Vdl × Idl or = Pal = Val × Ial) for each branch acquired from the measurement unit 82 or Po on the non-branch side. A value of (= Pdl = Vdl × Idl or = Pal = Val × Ial) is transmitted to the system management apparatus 12. Further, the measuring unit 82 passes the value of Po for each branch to the solution parallel control unit 84 for each branch in the subsequent stage.

  The storage unit 83 stores the Po limit value for each branch notified from the system management apparatus 12 and passes the stored Po limit value for each branch to the solution parallel control unit 84 for each branch. Further, the transmission / reception unit 81 passes the branch release request for each branch or the parallel request for each branch received from the system management apparatus 12 to the solution parallel control unit 84 for each branch.

  When there is a request for disconnection for each branch from the system management device 12, the solution parallel control unit 84 for each branch disconnects the load devices 10 and 11 or the branch devices 8 and 9 connected to the branch, and for each branch. When there is a parallel request, the load devices 10 and 11 or the branch devices 8 and 9 connected to the branch are paralleled.

  In addition, when the branch-to-branch solution parallel control unit 84 has a Po value for each branch input from the measurement unit 82 larger than the Po limit value for each branch acquired from the storage unit 83, the load connected to the branch. The devices 10 and 11 or the branching devices 8 and 9 are disconnected, and when they are equal or smaller, the load devices 10 and 11 or the branching devices 8 and 9 connected to the branch are arranged in parallel.

[Functional configuration of DC load device or AC load device under non-system]
FIG. 7 is a functional block diagram of the DC load device 10 or the AC load device 11 that is not subordinate to the system.
As shown in FIG. 7, the DC load device 10 or the AC load device 11 not under the system of the present embodiment includes, in order from the left in the figure, a transmission / reception unit 101, a measurement unit 102, a storage unit 103, a deparallel control unit 104, and Po. A control unit 105 is included.

The transmission / reception unit 101 includes a communication interface that communicates with the system management device 12, and the measurement unit 102 includes sensors that measure the current Idl or Ial and the voltage Vdl or Val on the branching devices 8 and 9 or the conversion devices 4 and 5 side. Have
The storage unit 103 includes a memory that stores setting values notified from the system management apparatus 12 via the transmission / reception unit 101.

In response to the acquisition request from the system management device 12, the transmission / reception unit 101 transmits the value Po (= Pdl = Vdl × Idl or = Pal = Val × Ial) acquired from the measurement unit 102 to the system management device 12. In addition, the measurement unit 102 passes the Po value to the subsequent-stage solution parallel control unit 104 and the subsequent-stage Po control unit 105.
The storage unit 103 stores the Po limit value notified from the system management apparatus 12, and passes the stored Po limit value to the solution parallel control unit 104 and the Po control unit 105. In addition, the transmission / reception unit 101 passes the removal request or parallel request received from the system management apparatus 12 to the solution parallel control unit 104.

  The Po control unit 105 controls the load so that the value of Po input from the measurement unit 102 is equal to or less than the Po limit value acquired from the storage unit 103.

When there is a disconnection request from the system management device 12, the parallel cancellation control unit 104 disconnects from the branching devices 8 and 9 or the conversion devices 4 and 5, and when there is a parallel request, the branching device 8. , 9 or converters 4 and 5 in parallel.
In addition, when the value of Po input from the measurement unit 102 is larger than the Po limit value acquired from the storage unit 103, the solution parallel control unit 104 performs the disconnection from the branching devices 8 and 9 or the conversion devices 4 and 5. If they are equal or smaller, they are parallel to the branching devices 8 and 9 or the conversion devices 4 and 5.

  Note that both the Po control unit 105 and the solution parallel control unit 104 are not essential, and only one of them may be provided.

[Functional configuration of branch device for AC load device under system]
FIG. 8 is a functional block diagram of the branch device 15 for an AC load device under the system.
As illustrated in FIG. 8, the branch device 15 for an AC load device under the system of the present embodiment includes a transmission / reception unit 151, a measurement unit 152, a storage unit 153, and a deparallel control unit 154 for each branch in order from the left in the drawing. .

The transmission / reception unit 151 includes a communication interface that communicates with the system management device 12 or the DC / AC conversion device 13 for AC power system, and the measurement unit 152 includes the current Ials for each branch on the AC load device 16 or the branch device 15 side, and It has sensors for measuring the voltage Vals.
The storage unit 153 includes a memory that stores setting values notified from the system management apparatus 12 or the like via the transmission / reception unit 151.

  The transmission / reception unit 151 responds to an acquisition request from the system management apparatus 12 and receives the value of Po (= Pals = Vals × Ials) for each branch acquired from the measurement unit 152 or Po (= Pals = Vals × Ials) on the non-branch side. ) Is transmitted to the system management device 12. Further, the measurement unit 152 passes the value of Po for each branch to the solution parallel control unit 154 for each subsequent branch.

The storage unit 153 stores the Po limit value for each branch notified from the system management apparatus 12 and passes the stored Po limit value for each branch to the solution parallel control unit 154 for each branch.
In addition, the transmission / reception unit 151 passes the permutation request for each branch or the parallel request for each branch received from the system management apparatus 12 to the per-branch solution parallel control unit 154.

  When there is a branching request for each branch from the system management device 12, the solution parallel control unit 154 for each branch solves the AC load device 16 or the branching device 15 connected to the branch from the conversion device 13 or the branching device 15. When there is a parallel request for each branch, the AC load device 16 or the branch device 15 connected to the branch is paralleled to the conversion device 13 or the branch device 15.

  Further, the deparallel control unit 154 for each branch determines that the value of Po for each branch input from the measurement unit 152 is larger than the Po limit value for each branch acquired from the storage unit 153, and the AC connected to the branch. When the load device 16 or the branch device 15 is disconnected from the conversion device 13 or the branch device 15 and is equal or smaller, the AC load device 16 or the branch device 15 connected to the branch is arranged in parallel with the conversion device 13 or the branch device 15. .

[Functional configuration of AC load device under system]
FIG. 9 is a functional block diagram of the AC load device 16 under the system.
As illustrated in FIG. 9, the AC load device 16 under the system of the present embodiment includes a transmission / reception unit 161, a measurement unit 162, a storage unit 163, a deparallel control unit 164, and a Po control unit 165 in order from the left in the drawing.

The transmission / reception unit 161 includes a communication interface that communicates with the system management device 12 or the DC / AC conversion device 13 for AC power system. The measurement unit 162 measures the current Ials and the voltage Vals on the branch device 15 or the conversion device 13 side. Sensor.
The storage unit 163 includes a memory that stores setting values notified from the system management apparatus 12 or the like via the transmission / reception unit 161.

In response to the acquisition request from the system management device 12, the transmission / reception unit 161 transmits the value of Po (= Pals = Vals × Ials) acquired from the measurement unit 162 to the system management device 12. In addition, the measurement unit 162 passes the value of Po to the post-stage deparallel control unit 164 and the post-stage Po control unit 165.
The storage unit 163 stores the Po limit value notified from the system management apparatus 12 and passes the stored Po limit value to the solution parallel control unit 164 and the Po control unit 165. In addition, the transmission / reception unit 161 passes the disconnection request or parallel request received from the system management device 12 to the solution parallel control unit 164.

  The Po control unit 165 controls the load so that the Po value input from the measurement unit 162 is equal to or less than the Po limit value acquired from the storage unit 163.

The de-parallel control unit 164 disconnects from the branching device 15 or the conversion device 13 when there is a disconnection request from the system management device 12, and when there is a parallel request, the branching device 15 or the conversion device 13. In parallel.
In addition, when the value of Po input from the measurement unit 162 is greater than the Po limit value acquired from the storage unit 163, the solution parallel control unit 164 disconnects from the branching device 15 or the conversion device 13 and is equal. If it is smaller, it is parallel to the branch device 15 or the conversion device 13.

  Both the Po control unit 165 and the solution parallel control unit 164 are not essential, and only one of them may be provided.

[Change in Vdc for each power supply / demand situation]
FIGS. 13 and 14 are graphs showing an example of a temporal change in Vdc. FIG. 13 shows a case where the total Pdcp value ≧ 0 (in the case of excess power), and FIG. 14 shows a case where the total Pdcn value ≧ 0 (power) Indicates a shortage).
FIGS. 15 to 19 are explanatory diagrams showing the power supply and demand status of the system in the states 1 to 5 in FIGS. 13 and 14, respectively.

That is, FIG. 15 shows the power supply and demand situation in state 1 in FIG. 13, which satisfies the following inequality and equality, and for each Tdc of Vdc by the DC / AC converter 13 for AC power system. This is a power supply and demand situation when the power control (second Vdc control) for setting the average value of Vdcm to Vdcm is successful.
Pdcp total value ≥ 0 (excessive power state)
Pdcp total value ≦ total value of Po maximum possible value of DC / AC conversion device 13 for AC power system AC Po value of DC / AC conversion device 13 for AC power system = Pdcp total value

As shown in FIG. 15, in this case, the generated power exceeds the load power, but as a result of the second Vdc control by the AC power system DC / AC converter 13, the surplus power is reversely flowed to the AC power system 14. The
In this case, the average value of Vdc for each Ts is maintained at Vdcm, and the value of (Vdch−Vdc) does not decrease. For this reason, in the power control (first Vdc control) in which Vdc is set to Vdch by the DC / DC converter 2 for the power generator, the necessary Pi becomes large due to the effect of the I control of the PI control, and the Pi maximum possible value is DC. Input to distribution line 1.

FIG. 16 shows the power supply and demand situation in state 2 of FIG. 13, which satisfies the following inequality and equation, and is the average of Vdc for each Ts by the DC / AC converter 13 for AC power system. This is a power supply / demand situation when the power control (second Vdc control) for setting the value to Vdcm is about to fail.
Pdcp total value ≥ 0 (excessive power state)
Pdcp total value> Total value of Po maximum possible value of DC / AC conversion device 13 for AC power system AC Total value of Po of DC / AC conversion device 13 for AC power system = Total value of Po maximum possible value of the conversion device 13

  As shown in FIG. 16, in this case, the generated power exceeds the load power, and as a result of the second Vdc control by the DC / AC converter 13 for AC power system, the excess power is reversely flowed to the AC power system 14. However, excess electric power that cannot be treated yet is supplied to the DC distribution line 1, and this causes an increase in Vdc.

FIG. 17 shows the power supply and demand situation in state 3 of FIG. 13, which satisfies the following inequality and equation and is the average of Vdc for each Ts by the DC / AC converter 13 for AC power system. Although the power control (second Vdc control) for setting the value to Vdcm has failed, the power control (first Vdc control) for setting Vdc to Vdch by the DC / DC converter 2 for the power generator has succeeded. This is the situation of electricity supply and demand.
Pdcp total value ≥ 0 (excessive power state)
Pdcp total value = total value of Po maximum possible value of DC / AC conversion device 13 for AC power system AC total value of Po of DC / AC conversion device 13 for AC power system = total value of Po maximum possible value of conversion device 13

  As shown in FIG. 17, in this case, even if the generated power exceeds the load power and Vdc rises due to excess power that cannot be processed even by the second Vdc control by the DC / AC converter 13 for AC power system, power generation As a result of the first Vdc control by the apparatus DC / DC converter 2, the generated power corresponding to the excess power that could not be processed by the AC power system DC / AC converter 13 is suppressed.

FIG. 18 shows the power supply and demand situation in state 4 in FIG. 14, which satisfies the following inequality and equation and is an average of Vdc for each Ts by the DC / AC converter 13 for AC power system. This is the power supply / demand situation when the power control (second Vdc control) for setting the value to Vdcm is successful.
Pdcn total value ≧ 0 (power shortage state)
Pdcn total value ≦ total value of Pi maximum possible value of DC / AC converter 13 for AC power system Pi total value of DC / AC converter 13 for AC power system = Pdcn total value

As shown in FIG. 18, in this case, the generated power is less than the load power, but as a result of the second Vdc control by the AC power system DC / AC converter 13, the shortage power is forward-flowed from the AC power system 14. Thus, the average value of Vdc for each Ts is maintained at Vdcm.
In this case, the average value of Vdc for each Ts is maintained at Vdcm, and the value of (Vdch−Vdc) does not decrease. For this reason, in the power control (first Vdc control) in which the DC / DC converter 2 for power generator sets Vdc to Vdch, the necessary Pi becomes large due to the effect of the I control of the PI control, and the Pi maximum possible value is DC. Input to distribution line 1.

FIG. 19 shows the power supply and demand situation in state 5 in FIG. 14, which satisfies the following inequality and equation, and is the average of Vdc for each Ts by the DC / AC converter 13 for AC power system. This is the power supply / demand situation when the power control (second Vdc control) for setting the value to Vdcm has failed.
Pdcn total value ≧ 0 (power shortage state)
Pdcn aggregate value> Pi maximum possible value of AC power system DC / AC converter 13 Pi total value of AC power system DC / AC converter 13 = Pi maximum possible value of the converter 13 In this case, the generated power is lower than the load power, and as a result of the second Vdc control by the DC / AC converter 13 for AC power system, the insufficient power is flowing forward from the AC power system 14, but still cannot be processed. Insufficient power is generated, and this is a cause of a decrease in Vdc.

  Further, when Vdc falls, (Vdc−Vdc) increases, so Pi required for power control (first Vdc control) for DC / DC converter 2 for the power generator to change Vdc to Vdc increases. Power control is performed so that the Pi maximum possible value is input to the DC distribution line 1 while exceeding the Pi maximum possible value. Therefore, in this case, Vdc is not maintained at Vdch.

[Effect of Vdc control]
As described above, according to the DC power distribution system of the present embodiment, the first Vdc control and the second Vdc control are performed independently of each other. Therefore, the second Vdc control by the AC power system converter 13 is successful. In the power supply and demand situation, the average value of Vdc for each Ts is maintained at Vdcm, and (Vdch−Vdc) does not decrease.
For this reason, Pi required for the 1st Vdc control by the converter 2 for power generators becomes large, and the converter 2 for power generators inputs the Pi maximum possible value into the DC distribution line 1.

On the other hand, when the second Vdc control by the AC power system converter 13 fails and the average value of Vdc for each Ts is not maintained at Vdcm and Vdc rises, (Vdch−Vdc) becomes small. . In this case, the first Vdc control for changing Vdc to Vdcch by the power generating device conversion apparatus 2 is successful, and Vdc is maintained so as not to exceed Vdcch.
As described above, according to the DC power distribution system of the present embodiment, Vdc can be maintained within a predetermined range by the first and second Vdc control performed independently by each of the converters 2 and 13, so that communication delays and communication abnormalities can be maintained. Therefore, it is possible to reliably perform control to maintain Vdc within a predetermined range.

  Further, in the case of a DC power distribution system that employs a plurality of conversion devices 2 and 13 that perform power control, the Vdc target value (Vdc) of the power generation device conversion device 2 is greater than the Vdc target value (Vdcm) of the AC power system conversion device 13. It can be mounted simply by setting it higher, and there is an advantage that a system capable of controlling the voltage Vdc of the DC distribution line 1 within a predetermined range can be easily constructed.

  Furthermore, in the DC power distribution system of the present embodiment, in the first Vdc control by the power generator conversion device 2, when the power target value corresponding to Vdc exceeds the maximum power Pg that can be generated by the power generator 6, Since the maximum power Pg is set as a target value for power control, it is possible to prevent the first Vdc control from being executed by setting the power target value to a value exceeding the maximum power Pg of the power generator 6. Can be prevented.

  Control is performed such that Vdc becomes the Vdc target value (extra high) as the difference between Vdc target value (extra high) (Vdc) is large and the difference between Vdc target value (standard) (Vdcm) + allowable error δ2 is large. The Pi required for the operation increases, and the efficiency of control for inputting the Pi maximum possible value to the DC distribution line 1 (the probability of Pi = Pi maximum possible value) is improved.

  Further, in the DC power distribution system of the present embodiment, in the second Vdc control by the AC power system conversion device 13, the power target value corresponding to Vdcm is the maximum power that can be output from the DC power distribution line 1 to the device 13. When a certain Po maximum possible value is exceeded, the Po maximum possible value is set as a target value for power control, so that the second Vdc is set by setting the power target value to a value exceeding the Po maximum possible value. It is possible to make control impossible.

  Similarly, in the DC power distribution system of the present embodiment, in the second Vdc control by the AC power system conversion device 13, the power target value corresponding to Vdcm is the maximum power that can be input from the own device 13 to the DC power distribution line 1. When the Pi maximum possible value is exceeded, the Pi maximum possible value is set as the target value for power control. Therefore, by setting the power target value to a value exceeding the Pi maximum possible value, the second It is possible to prevent the Vdc control from being executed.

Furthermore, in the DC power distribution system of the present embodiment, in the second Vdc control by the AC power system conversion device 13, the control target is not Vdc itself but the average value of Vdc for each Ts.
For this reason, the second Vdc control can be performed without causing distortion of the current (Isfb) on the AC power system 14 side, which becomes a problem when controlling the Vdc itself to become the Vdc target value (standard). There is an advantage.

[Outline of power supply and demand control by system management equipment]
FIG. 20 is a flowchart of power supply and demand control by the system management device 12.
The power supply / demand control by the system management device 12 (hereinafter also simply referred to as “management device 12”) is control for changing the power supply / demand for each device in the system, and the first and second supply / demand control shown in FIG. It becomes more. The management apparatus 12 performs these supply and demand controls at a constant cycle of several seconds to several minutes. In addition, the average value for every period is employ | adopted for measured values, such as an electric power value used for electric power supply-and-demand control, a voltage value, and an electric current value.

The system management device 12 includes a control unit including a CPU and the like, a storage unit including a memory, an HDD, and other storage media, and a communication unit that communicates with various devices, and controls the computer program stored in the storage unit. Are read out and executed to realize the first and second supply-demand control.
In addition, a predetermined reduction list (see FIGS. 23 and 24) necessary for the first and second supply and demand control is recorded in the storage unit.

In both the first and second supply and demand control, the power supply and demand situation in the system is changed to support the establishment of the Vdc control (second Vdc control) by the DC / AC converter 13 for the AC power system. Control.
In other words, the first and second supply and demand control is performed in order to establish a “requirement”, which will be described later, which is a precondition for the successful Vdc control by the DC / AC converter 13 for the AC power system, so that the PdcpnPals total value (PdcpPals total Value or PdcnPals total value).

(Power total value replacement process)
Here, the reduction target by supply and demand control is not “Pdcnp total value” but “PdcpnPals total value”. In this embodiment, the AC load device 16 under the DC / AC conversion device 13 for the AC power system is used. This is because load power is also included in the reduction target.
That is, in the power supply and demand control of the present embodiment, the connection point SP of the AC load device DC / AC converter 5 that is out of the series of the AC power system 14 is used as the connection point of the AC load device 16 under the system in FIG. (See FIG. 1) A virtual shift in calculation is performed.

As a specific process, the total value is replaced as follows.
Pdcn total value (= Po total value of conversion device 4 + Po total value of conversion device 5−Pi total value of conversion device 2) → “Pdcn total value + Pals total value”
Pdcp total value (= Pi total value of the conversion device 2−Po total value of the conversion device 4−Po total value of the conversion device 5) → “Pdcp total value−Pals total value”

Pi (= Psf−Pals subtotal value of conversion device 13) of interest → Slight loss due to conversion → Pi + Pals subtotal value of conversion device 13 (= Psf−small loss due to conversion)
The Po (= Psb + Pals subtotal value + slight loss due to conversion) of the conversion device 13 of interest is replaced with the Po-Pals subtotal value (= Psb + slight loss due to conversion) of the conversion device 13.

(Addition of term definitions)
With the replacement of the above power value, the following parameter definition is added in the following description.
PdcnPals total value: “Pdcn total value + Pals total value”.
PdcpPals total value: “Pdcp total value−Pals total value”.
PdcnPPals total value: PdcnPals total value or PdcpPals total value.

PiPals: “Pi + Pals subtotal value”.
It should be noted that if a slight loss due to conversion is subtracted from Psf, PiPals is obtained, and both are substantially equal.
PiPals maximum possible value: “Pi maximum possible value + Pals subtotal value”.
If a slight loss due to conversion is subtracted from the maximum possible value of Psf, the maximum possible value of PiPals is obtained, and both are substantially equal.

PoPals: “Po-Pals subtotal value”.
If a slight loss due to conversion is subtracted from PoPals, Psb is obtained, and both are substantially equal.
PoPals maximum possible value: “Po maximum possible value−Pals subtotal value”.
If a slight loss due to conversion is subtracted from the maximum possible value of PoPals, the maximum possible value of Psb is obtained, and both are substantially equal.

PioPals: refers to PiPals or PoPals.
PioPals maximum possible value: PiPals maximum possible value or PoPals maximum possible value.

(Requirements for successful second Vdc control)
Necessary conditions for establishing the Vdc control of the DC / AC converter 13 for the AC power system in consideration of the Pals total value are as follows.
PdcnPPals total value ≦ PioPals maximum possible value total value of DC / AC converter 13 for AC power system If this requirement is satisfied, PioPals total value of DC / AC converter 13 for AC power system = PdcnPPals total Value. Further, since this relational expression is a relational expression regarding the maximum possible Pio value, an average value for each Ts is assumed.

The “first supply and demand control” is a so-called “post-mortem” control that is performed when the Vdc control of the DC / AC converter 13 for AC power system has failed. The case where the Vdc control of the conversion device 13 has failed means a case where the average value of Vdc for each Ts deviates from the allowable error δ2 of the second Vdc control by the conversion device 13, for example, FIG. This is the case of “state 2” and “state 3” and “state 5” in FIG.
In the first supply-demand control, PdcnPPals total value reduction amount target value = PdcnpPals total value × df, and until the Vdc control of the DC / AC converter 13 for AC power system succeeds, the PdcnPPals total value is reduced by the target value. repeat. “Df” is a reduction rate, for example, 0.1.

Here, when the Vdc control of the DC / AC converter 13 for AC power system fails, the generated power and load power in the system may be suppressed.
For example, when the PdcpPals total value ≧ 0, the generated power is suppressed as a result of the Vdc control of the DC / DC converter 2 for the power generator. Further, when the PdcnPals total value ≧ 0, the load power is suppressed as a result of the DC load converter DC / DC converter 4 and the AC load apparatus DC / AC converter 5 being stopped due to a decrease in Vdc.

Therefore, when the PdcnpPals total value is reduced, the suppression of the generated power and the load power changes, and the PdcnpPals total value reduction amount target value cannot be accurately estimated at one time.
Therefore, in the first supply-demand control, the PdcnPPals total value reduction amount target value obtained by multiplying the fixed value reduction rate is repeatedly subtracted from the current PdcnPPals total value until the second Vdc control succeeds, thereby 2 Vdc control is established.

The “second supply and demand control” is a so-called “preventive” control that is performed when the Vdc control of the DC / AC converter 13 for the AC power system is successful. The case where the Vdc control of the conversion device 13 is successful is a case where the average value of Vdc for each Ts is within the range of the allowable error δ2 of the second Vdc control by the conversion device 13, for example, FIG. This is the case of “state 1” or “state 4” in FIG.
In the second supply and demand control, the PdcnPPals total value is reduced in advance as PdcnPPals total value reduction amount target value = PdcnPPals total value−PioPals maximum possible value total value / sf of the DC / AC converter 13 for AC power system. “Sf” is a safety factor, for example, sf = 1.1.

That is, in this case, the PdcnpPals total value after reduction is calculated by the following equation.
PdcnpPals total value after reduction = PdcnPPals total value−PdcnpPals total value reduction amount target value = PioPals maximum possible value total value / sf of DC / AC converter 13 for AC power system
Note that when the PdcnPPals total value reduction amount target value <0, the reduction becomes excessive. In this case, the excessive reduction of the PdcnpPals total value is canceled (step ST14 in FIG. 25 and the subroutine CLp ( 28), and step ST24 of FIG. 26 and the subroutine CLn below (see FIG. 30)).

The second supply and demand control will be described from another viewpoint as follows.
That is, as described above, the “total PdcnPPals value after reduction” is a value obtained by multiplying the “total PioPals maximum possible value” by 1 / sf (sf> 1). In other words, the PdcnPPals total value The maximum reduction amount is PioPals maximum possible value total value × (1-1 / sf).

Therefore, if the PioPals maximum possible value total value × (1-1 / sf) = threshold value Th is replaced, the second supply and demand control is such that (PioPals maximum possible value total value−PdcnpPals total value) is equal to or greater than the threshold value Th. , Equivalent to reducing the PdcnpPals aggregate value.
When this is divided into Po and Pi, the second supply-demand control reduces the PdcpPals total value so that (PoPals maximum possible value total value-PdcpPals total value) is equal to or greater than the first threshold Th1, and (PiPals This is control for reducing the PdcnPals total value so that the maximum possible value total value−PdcnPals total value) is equal to or greater than the second threshold Th2.

Or if it replaces with PioPals maximum possible value total value x1 / sf = threshold value Thh, 2nd supply-and-demand control is equivalent to reducing PdcnpPals total value so that PdcnpPals total value may become below threshold value Thh.
When this is divided into Po and Pi, the second supply-demand control reduces the PdcpPals total value so that the PdcpPals total value is equal to or less than the first threshold Thh1, and the PdcnPals total value is equal to or less than the second threshold Thh2. Thus, the control is to reduce the PdcnPals total value.

In the present embodiment, the same safety factor sf is applied to the first and second threshold values Th1 and Th2 (PioPals maximum possible value total value × (1-1 / sf)). Different safety factors sf1 and sf2 may be applied to Th2.
Also, when the safety factor is applied to the first and second thresholds Thh1 and Thh2 (PioPals maximum possible total value × 1 / sf), different safety factors sf1 and sf2 are applied to these thresholds Thh1 and Thh2. May be.

The system management device 12 exchanges information with the conversion devices 2, 4, 5, 13, the branch devices 8, 9, 15, the load devices 10, 11, 16, the AC power system 14, and the power generation device 6 through communication, Based on the measured value obtained by the information exchange, the above-described first and second supply / demand control is performed.
The measured values and calculated values used by the system management device 12 for power supply and demand control are summarized as follows.
・ Vdc measurement value of any converter 2, 4, 5, 13 ・ Po measurement of DC / DC converter 4 for DC load device ・ Po measurement of DC / AC converter 5 for AC load device ・ For power generator Pi measurement value of DC / DC converter 2-Pals subtotal value under DC / AC converter 13 for AC power system. This calculation is as described above. Therefore, the measured value of Po (= Pals) of the AC load device 16, the measured value of Po (= Pals) on the non-branch side of the branch device for AC load device 15, and each branch The measurement value of Po (= Pals), the Pio measurement value of the DC / AC converter 13 for AC power system, the Psfb measurement value of the AC power system 14 and the like are used.

PdcnPals total value = −PdcpPals total value This is calculated by the following equation.
PdcnPals total value = Σ (Po measurement value of DC / DC converter 4 for DC load device)
+ Σ (Po measured value of DC / AC converter 5 for AC load device)
-Σ (Pi measurement value of DC / DC converter 2 for power generator)
+ Σ (Pals subtotal value under DC / AC converter 13 for AC power system)

・ Psfb maximum possible value of AC power system 14 ・ PioPals maximum possible value total value of DC / AC converter 13 for AC power system = Σ (PioPals maximum possible value of DC / AC converter 13 for AC power system)
The PiPals maximum possible value of each DC / AC converter 13 for AC power system 13 is calculated by subtracting a slight loss due to conversion from the Psf maximum possible value, and the PoPals maximum possible value is the Psb maximum possible value, Calculate by adding a small loss due to conversion.

When reducing the PdcnpPals total value, the system management device 12 transmits at least one command of “Pio limit value”, “disconnection request”, and “parallel request” to the corresponding device.
Specifically, when reducing the PdcnpPals total value, the management device 12 transmits a “Pi limit value” to at least one of the DC / DC converter 2 for power generation device 2 and the power generation device 6.

  Alternatively, when the management device 12 reduces the PdcnPPals total value, the DC load device DC / DC converter 4, the DC load device branch device 8, the DC load device 10, and the AC load device DC / AC converter 5, Transmit Po limit value, disconnection request, or parallel request to at least one of branch device 9 for AC load device, AC load device 11, branch device 15 of AC power system 14 series, and AC load apparatus 16 of the series. To do.

[List used for PdcnpPals total value reduction processing]
The system management apparatus 12 stores a “PdcpPals total value reduction list” (the upper list in FIG. 23) and a “PdcnPals total value reduction list” (the upper list in FIG. 24) in the storage device in advance. The management device 12 reduces the PdcnPPals total value according to these lists.

The “PdcpPals total value reduction list” in the upper part of FIG. 23 is for “excessive power mitigation” of the DC distribution line 1.
As shown in the operation table in the lower part of FIG. 23, the target of the PdcpPals total value reduction list includes the DC / DC converter 2 for a natural energy power generator and the natural energy power generator 6. The system management apparatus 12 reduces the generated power limit value in a range from the normal value (maximum) to the emergency limit value (minimum) by transmitting the Pi limit value to these devices.

Further, the PdcpPals total value reduction list further includes the DC load device DC / DC converter 4, the DC load device branch device 8, the power supply / demand control DC load device 10, and the AC load device DC / DC. AC conversion device 5, branching device for AC load device 9 and 15 and AC load devices 11 and 16 for power supply and demand control are included.
The system management device 12 increases the load power limit value in the range from the normal value (minimum) to the emergency limit value (maximum) by transmitting a Po limit value or a parallel request to these devices.

In the reduction list of FIG. 23, “current line” indicates a line that is an operation target. Therefore, in the case of the line before the current line, the operation has been performed, so the current value = the emergency limit value. In the case of the current line, the current value = normal value when the operation is not performed, and the current value = a value between the normal value and the emergency limit value when the operation is being performed.
Further, in the case of a line after the current line, the operation has not been performed, so the current value = normal value. Note that the initial value = 0 means that the PdcpPals total value reduction process is not performed at all, that is, the first line is not performed.

The devices and operations listed in each row number of the PdcpPals total value reduction list are considered to be advantageous from the viewpoint of reducing the PdcpPals total value in terms of devices and operations that increase load power and devices and operations that reduce generated power. Are lined up.
For example, in the list of FIG. 23, “DC power tap” of row number 1 and “DC / DC for charging mobile device” of row number 2 are load powers that can be used for the current control. It is preferable to perform an operation of increasing the load power at the beginning.

Therefore, the reduction process operation (operation execution) using the PdcpPals total value reduction list is performed in ascending order from the first line of the line number.
That is, in the case of performing the operation of the PdcpPals total value reduction list, the system management device 12 performs the operation described in the “operation” column of the “current row” of the list to set the current value of the current row to the emergency limit value. A process of replacing the current value with a value within a range from the normal value to the emergency limit value (in the case of Po limit value transmission or Pi limit value transmission) is performed.

Conversely, the operation (operation cancellation) for canceling the reduction process using the PdcpPals total value list is performed in descending order from the current line.
That is, in the case of canceling the operation of the PdcpPals total value reduction list, the system management device 12 cancels the operation described in the “Operation” column of the “Current Row” of the list, thereby making the current value of the current row normal. A process of returning to a value (in the case of parallel request transmission) or a process of replacing the current value with a value within the normal value from the emergency limit value (in the case of Po limit value transmission or Pi limit value transmission) is performed.

The “PdcnPals total value reduction list” in the upper part of FIG. 24 is for “underpower reduction” of the DC distribution line 1.
As shown in the lower table of FIG. 24, the PdcnPals total value reduction list includes the power supply / demand control power generator DC / DC converter 2 and the power supply / demand control power generator 6. The system management device 12 transmits the Pi limit value to these devices, thereby expanding the limit value of the generated power in the range from the normal value (minimum) to the emergency limit value (maximum).

Further, the PdcnPals total value reduction list further includes a DC / DC conversion device 4 for a DC load device, a branch of a branch device 8 for a DC load device, a normal DC load device 10, and a DC / AC conversion for an AC load device. The apparatus 5, the branch of the branch devices 9 and 15 for AC load devices, and the normal AC load devices 11 and 16 are included.
The system management apparatus 12 reduces the load power limit value in the range from the normal value (maximum) to the emergency limit value (minimum) by transmitting a Po limit value or a disconnection request to these devices. .

The devices and operations listed in each row number of the PdcnPals total value reduction list are considered to be advantageous from the viewpoint of reducing the PdcnPals total value in terms of devices and operations that reduce load power and devices and operations that increase generated power. Are lined up.
For example, in the list of FIG. 24, “gas power generation” of line number 1 and “DC / DC for diesel power generation” of line number 2 are generated powers that can be used for the current control. It is preferable to perform an operation to increase the generated power first.

  Therefore, the operation (operation execution) of the reduction process using the PdcnPals total value reduction list and the cancellation (operation release) of the reduction process are the same as those using the PdcpPals total value reduction list. It is performed in ascending order from the line, and in the case of canceling the operation, it is performed in descending order from the current line.

[First supply and demand control]
FIG. 21 is a flowchart illustrating a specific example of the first supply and demand control.
As shown in FIG. 21, when performing the first supply and demand control, the system management device 12 first has the current Vdc of the DC distribution line 1 (Vdc measurement values at arbitrary conversion devices 2, 4, 5, 13). (Step S1), and a PdcnPals total value (= −PdcpPals total value) is calculated (step S2).

The calculation formula of the PdcnPals total value (= −PdcpPals total value) is as follows.
PdcnPals total value (= -PdcpPals total value)
= Σ (Po measurement value of DC / DC converter 4 for DC load device)
+ Σ (Po measured value of DC / AC converter 5 for AC load device)
-Σ (Pi measurement value of DC / DC converter 2 for power generator)
+ Σ (Pals subtotal value under DC / AC converter 13 for AC power system)

Next, the management device 12 determines which of the PdcnPPals total values is a positive number (step S3), and if PdcpPals total value ≧ 0, determines whether or not the following inequality holds ( Step S4).
Average value of Vdc for each Ts> Vdc target value (standard)
+ Allowable error δ2 of Vdc control of DC / AC converter 13 for AC power system

If the above inequality in step S4 does not hold, the management apparatus 12 ends the processing. If it does, the management device 12 multiplies the PdcpPals total value at that time by the reduction rate df to calculate the PdcpPals total value reduction amount target value, Is transferred to a subroutine RDp (flowchart in FIG. 25) for reducing the PdcpPals total value.
Note that after the subroutine RDp is completed, the management device 12 returns the process to before step S1.

Moreover, the management apparatus 12 determines whether the following inequality is materialized, when PdcnPals total value> = 0 (step S6).
Average value of Vdc for each Ts <Vdc target value (standard)
-Allowable error δ2 of Vdc control of DC / AC converter 13 for AC power system

If the above inequality in step S6 does not hold, the management apparatus 12 ends the processing, and if it does, the PdcnPals total value at that time is multiplied by the reduction rate df to calculate a PdcnPals total value reduction amount target value, and processing Is transferred to a subroutine RDn (the flowchart in FIG. 26) for reducing the PdcnPals total value.
Note that after the subroutine RDn is completed, the management apparatus 12 returns the process to step S1.

[Second supply and demand control]
FIG. 22 is a flowchart showing a specific example of the second supply and demand control.
As shown in FIG. 22, when performing the second supply and demand control, the system management device 12 first calculates a PdcnPals total value (= −PdcpPals total value) (step S11).

The calculation formula of the PdcnPals total value (= −PdcpPals total value) is as follows.
PdcnPals total value (= -PdcpPals total value)
= Σ (Po measurement value of DC / DC converter 4 for DC load device)
+ Σ (Po measured value of DC / AC converter 5 for AC load device)
-Σ (Pi measurement value of DC / DC converter 2 for power generator)
+ Σ (Pals subtotal value under DC / AC converter 13 for AC power system)

  Next, the management device 12 determines which of the PdcnPPals total values is a positive number (step S12). If the PdcpPals total value ≧ 0, the PoPals maximum of the DC / AC conversion device 13 for AC power system is determined. A possible total value is calculated (step S13).

Thereafter, the management device 12 subtracts a value obtained by dividing the PoPals maximum possible value total value of the DC / AC converter 13 for the AC power system by the safety factor sf from the PdcpPals total value at that time, thereby reducing the PdcpPals total value reduction amount. A target value is calculated (step S14), and the process proceeds to a subroutine RDp (the flowchart in FIG. 25) for reducing the PdcpPals total value.
Note that after the subroutine RDp ends, the management device 12 ends the process.

  Moreover, the management apparatus 12 calculates the PiPals maximum possible value total value of the DC / AC converter 13 for alternating current power systems, when PdcnPals total value> = 0 (step S15).

Thereafter, the management device 12 subtracts a value obtained by dividing the PiPals maximum possible value total value of the DC / AC conversion device 13 for the AC power system by the safety factor sf from the PdcnPals total value at that time, thereby reducing the PdcnPals total value reduction amount. The target value is calculated (step S16), and the process proceeds to a subroutine RDn (flowchart in FIG. 26) for reducing the PdcnPals total value.
Note that after the subroutine RDn ends, the management device 12 ends the process.

[PdcpPals total value reduction processing]
FIG. 25 is a flowchart illustrating a specific example of PdcpPals total value reduction processing.
As shown in FIG. 25, in the subroutine RDp for the PdcpPals total value reduction process, the management device 12 first determines whether or not the PdcpPals total value reduction amount target value is a positive number (step ST11).

When the determination result of step ST11 is affirmative, that is, when the PdcpPals total value reduction amount target value is a positive number, it is necessary to alleviate excess power in the DC distribution line 1.
Therefore, the management device 12 performs a loop process that repeats the subroutine CLn until the determination in step ST12 becomes negative, and then performs a loop process that repeats the subroutine DLp until the determination in step ST13 becomes negative. finish.

That is, the management device 12 cancels the operation of the current line of the PdcnPals total value reduction list while PdcpPals total value reduction amount target value> 0 and the current line of the PdcnPals total value reduction list> 0 (Yes in step ST12). (Subroutine CLn: FIG. 30) is executed, and when the determination result in step ST12 is negative, the process proceeds to step ST13.
The subroutine CLn in this case is a process for canceling the operation for alleviating past insufficient power that has already been performed. In this process, for example, the expansion of the generated power limit value of the power supply / demand control power generation device 6 performed in the past is canceled, or the load power limit values of the normal load devices 10, 11, 16 performed in the past The process of canceling the reduction is included.

In addition, while the PdcpPals total value reduction amount target value> 0 (Yes in step ST13), the management device 12 executes the operation of the current line in the PdcpPals total value reduction list (subroutine DLp: FIG. 27), and the step If the determination result in ST13 is negative, the process ends.
The subroutine DLp in this case is a process for alleviating excess power. This process includes, for example, a process of reducing the generated power limit value of the natural energy power generation device 6 or increasing the load power limit value of the load devices 10, 11, 16 for power supply and demand control.

When the determination result of step ST11 is negative, that is, when the PdcpPals total value reduction amount target value is a negative number, the degree of excess power in the DC distribution line 1 is reduced, and it is necessary to mitigate excess power. Absent.
Therefore, the management apparatus 12 performs a loop process that repeats the subroutine CLp until the determination in step ST14 becomes negative, and ends the process.

  That is, the management device 12 cancels the operation of the current line of the PdcpPals total value reduction list while PdcpPals total value reduction amount target value <0 and the current line of the PdcpPals total value reduction list> 0 (Yes in step ST14). (Subroutine CLp: FIG. 28) is executed, and when the determination result of step ST14 is negative, the process is terminated.

The subroutine CLp in this case is a process for canceling the excessive power mitigation operation performed in the subroutine DLp.
In this process, for example, the reduction of the generated power limit value of the natural energy power generation device 6 performed in the past is canceled, or the load power limit value of the load devices 10, 11, 16 for power supply and demand control performed in the past is performed. The process of canceling the enlargement of is included.

[PdcnPals total value reduction processing]
FIG. 26 is a flowchart illustrating a specific example of the PdcnPals total value reduction process.
As shown in FIG. 26, in the subroutine RDn of the PdcnPals total value reduction process, the management device 12 first determines whether or not the PdcnPals total value reduction amount target value is a positive number (step ST21).

When the determination result of step ST21 is affirmative, that is, when the PdcnPals total value reduction amount target value is a positive number, it is necessary to alleviate the insufficient power in the DC distribution line 1.
Therefore, the management apparatus 12 performs a loop process that repeats the subroutine CLp until the determination in step ST22 is negative, and then performs a loop process that repeats the subroutine DLn until the determination in step ST23 is negative. finish.

That is, the management device 12 cancels the operation of the current line of the PdcpPals total value reduction list while PdcnPals total value reduction amount target value> 0 and the current line of the PdcpPals total value reduction list> 0 (Yes in step ST22). (Subroutine CLp: FIG. 28) is executed, and when the determination result of step ST22 is negative, the process proceeds to step ST23.
The subroutine CLp in this case is a process for canceling the past excessive power mitigation operation that has already been performed. In this process, for example, the reduction of the generated power limit value of the natural energy power generation device 6 performed in the past is canceled, or the load power limit value of the load devices 10, 11, 16 for power supply and demand control performed in the past is performed. The process of canceling the enlargement of is included.

In addition, while the PdcnPals total value reduction amount target value> 0 (Yes in step ST23), the management apparatus 12 executes the execution of the current line in the PdcnPals total value reduction list (subroutine DLn: FIG. 29), and the step If the determination result in ST23 is negative, the process ends.
The subroutine DLn in this case is a process for alleviating insufficient power. This process includes, for example, a process of expanding the generated power limit value of the power supply / demand control power generator 6 or reducing the load power limit value of the normal load devices 10, 11, 16.

When the determination result of step ST21 is negative, that is, when the PdcnPals total value reduction amount target value is a negative number, the degree of insufficient power in the DC distribution line 1 is reduced, and it is necessary to mitigate the insufficient power. Absent.
Therefore, the management apparatus 12 performs a loop process that repeats the subroutine CLn until the determination in step ST24 becomes negative, and ends the process.

  In other words, the management device 12 cancels the operation of the current line of the PdcnPals total value reduction list while the PdcnPals total value reduction amount target value <0 and the current line of the PdcnPals total value reduction list> 0 (Yes in step ST24). (Subroutine CLn: FIG. 30) is executed, and when the determination result of step ST24 is negative, the process is terminated.

  The subroutine CLn in this case is a process for canceling the excessive power reduction operation performed in the subroutine DLn. In this process, for example, the expansion of the generated power limit value of the power supply / demand control power generation device 6 performed in the past is canceled, or the load power limit values of the normal load devices 10, 11, 16 performed in the past The process of canceling the reduction is included.

[Operation of the current line in the PdcpPals total value reduction list (subroutine DLp)]
FIG. 27 is a flowchart showing a specific example of “operation execution” (subroutine DLp) on the current line of the PdcpPals total value reduction list.
As shown in FIG. 27, in the subroutine DLp, the system management apparatus 12 first determines whether or not the current line of the PdcpPals total value reduction list (FIG. 23) is “0” (step S101).

When the current row is 0, the management device 12 sets the current row of the list to “1” (step S102), determines the operation content of the first row of the list (step S103), and the current row is “0”. If not, the operation content of the current line is determined (step S103).
If it is determined in step S103 that the operation content of the current line is “transmission of parallel request”, the management apparatus 12 executes the operation content (that is, “transmission of parallel request”) (step S104). This has the same effect as the operation of transmitting the Po limit value with the “Po limit value emergency limit value (maximum)” in the current line as the transmission value. Thereby, the load devices 10, 11, and 16 for power supply and demand control are arranged in parallel, and the Po limit value there becomes an emergency limit value (maximum).

Next, the management device 12 sets the PdcpPals total value reduction amount target value from the current value (“Po limit value emergency limit value (maximum)” of the current line corresponding to the transmission equivalent value) — “Po limit value current value of the current line” ")" Is substituted (step S105), and "Po limit value current value" of the current line is replaced with "Po limit value emergency limit value (maximum)" of the current line corresponding to the transmission equivalent value (step S106).
Thereafter, the management device 12 increments the current line of the PdcpPals total value reduction list by one (step S107), and ends the process.

If it is determined in step S103 that the operation content on the current line is “Po limit value transmission”, the management apparatus 12 determines whether or not the following inequality is satisfied (step S108).
PdcpPals total value reduction amount target value>"Po limit value emergency limit value (maximum)" of the current line-"Po limit value current value" of the current line
If the above inequality holds, the target value cannot be achieved even if the reduction by the current line is maximized. If not, the target value can be achieved by performing the reduction by the current line to the maximum extent.

Therefore, if the determination result in step S108 is affirmative, the management device 12 uses the “emergency limit value (maximum limit value) of Po limit value” of the current line as a transmission value, and the operation content (that is, “Po limit value”) Value transmission ") is performed (step S109).
After performing step S109, the management apparatus 12 performs the processing from step S105 to step S107.

On the other hand, if the determination result in step S108 is negative, the management device 12 uses the value obtained by adding the PdcpPals total value reduction amount target value to the “Po limit value current value” of the current row as the transmission value. The operation content (ie, “Po limit value transmission”) is executed (step S110).
Thereafter, the management device 12 replaces the “Po limit value current value” of the current row with a transmission value (a value obtained by adding the “Po limit value current value” of the current row to the PdcpPals total value reduction target value) (step). S111), the PdcpPals total value reduction amount target value is set to “0” (step S112), and the process ends.

If it is determined in step S103 that the operation content of the current line is “Pi limit value transmission”, the management device 12 determines whether or not the following inequality is satisfied (step S113).
PdcpPals total value reduction amount target value>"Pi limit value current value" of the current line-"Pi limit value emergency limit value (minimum)" of the current line
If the above inequality holds, the target value cannot be achieved even if the reduction by the current line is maximized. If not, the target value can be achieved by performing the reduction by the current line to the maximum extent.

Therefore, if the determination result in step S113 is affirmative, the management device 12 uses the “Pi limit value emergency limit value (minimum)” of the current line as a transmission value, and the operation details of the current line (ie, “Pi limit”). Value transmission ") is performed (step S114).
After performing step S114, the management apparatus 12 calculates the PdcpPals total value reduction amount target value from the current value (“Pi limit value current value” of the current line− “Pi limit value of the current line that is the transmission value”). (Emergency limit value (minimum) ") is replaced with a value obtained by subtracting the value (step S115). Replace (step S116).

  Thereafter, the management device 12 increments the current line of the PdcpPals total value reduction list by one (step S117), and ends the process.

On the other hand, when the determination result of step S113 is negative, the management device 12 uses the value obtained by subtracting the PdcpPals total value reduction target value from the “Pi limit value current value” of the current row as the transmission value. The operation content (that is, “Pi limit value transmission”) is executed (step S118).
Thereafter, the management device 12 replaces the “Pi limit value current value” of the current row with a transmission value (a value obtained by subtracting the PdcpPals total value reduction amount target value from the “Pi limit value current value” of the current row) (step S119), the PdcpPals total value reduction amount target value is set to “0” (step S120), and the process ends.

[Release operation of current line in PdcpPals total value reduction list (subroutine CLp)]
FIG. 28 is a flowchart showing a specific example of “operation cancellation” (subroutine CLp) of the current line in the PdcpPals total value reduction list.

  In the PdcpPals total value reduction process (subroutine RDp: FIG. 25), if the determination result in step ST11 is negative, that is, if the “PdcpPals total value reduction amount target value” is a negative number, “−PdcpPals total value” In this state, excessive power relaxation has been excessively performed by the “reduction amount target value”, and in order to cancel it, the subroutine CLp is repeated until the determination in step ST14 becomes negative. Accordingly, in the subroutine CLp in this case, “-PdcpPals total value reduction amount target value” is set as “expansion target value”, and the operation content of the current line in the PdcpPals total value reduction list is canceled.

  On the other hand, in the PdcnPals total value reduction process (subroutine RDn: FIG. 26), if the determination result in step ST21 is affirmative, that is, “PdcnPals total value reduction amount target value” is a positive number, In order to cancel the past excessive power reduction operation that has already been performed, the subroutine CLp is repeated until the determination in step ST22 becomes negative. Accordingly, in the subroutine CLp in this case, “PdcnPals total value reduction amount target value” is set as “expansion target value”, and the operation content of the current line in the PdcpPals total value reduction list is canceled.

  As shown in FIG. 28, in the subroutine CLp, the system management apparatus 12 first determines the operation content in the current line of the PdcpPals total value reduction list (FIG. 23) (step S201).

  If it is determined in step S201 that the operation content of the current row is “transmission of parallel request”, the management device 12 cancels the operation content (that is, “transmission request release”) (step S202). This has the same effect as the operation of transmitting the Po limit value using the “Po limit value normal value (minimum)” of the current row as the transmission value. As a result, the power supply / demand control load devices 10, 11, and 16 are disconnected, and the Po limit value becomes the normal value (minimum).

Next, the management device 12 subtracts the expansion target value from the current value (“Po limit value current value of the current row” − “Po limit value normal value (minimum)” of the current row corresponding to the transmission equivalent value). It is replaced with a value (step S203), and “Po limit value current value” of the current line is replaced with “Po limit value normal value (minimum)” of the current line corresponding to the transmission equivalent value (step S204).
Thereafter, the management device 12 decrements the current line in the PdcpPals total value reduction list by one (step S205), and ends the process.

If it is determined in step S201 that the operation content on the current line is “Po limit value transmission”, the management apparatus 12 determines whether or not the following inequality is satisfied (step S206).
Expansion target value>"Po limit value current value" of the current line-"Po limit value normal value (minimum)" of the current line
If the above inequality holds, the target value cannot be achieved even if the reduction of the current line is maximized. If not, the target value can be achieved if the reduction of the current line is canceled to the maximum extent. Can be achieved.

Therefore, if the determination result in step S206 is affirmative, the management apparatus 12 sets the normal value (minimum) of the Po limit value as the transmission value (that is, cancels the PdcpPals total value reduction), and the operation content (that is, the current line). “Po limit value transmission”) is performed (step S207).
After performing step S207, the management apparatus 12 performs processing from step S203 to step S205.

On the other hand, if the determination result of step S206 is negative, the management device 12 uses the value obtained by subtracting the expansion target value from the “Po limit value current value” of the current row as the transmission value (that is, canceling the PdcpPals total value reduction). ), The operation content of the current line (that is, “Po limit value transmission”) is executed (step S208).
Thereafter, the management device 12 replaces the “Po limit value current value” of the current line with a transmission value (a value obtained by subtracting the expansion target value from the “Po limit value current value” of the current line) (step S209). The target value is set to “0” (step S210), and the process ends.

If it is determined in step S201 that the operation content on the current line is “Pi limit value transmission”, the management apparatus 12 determines whether or not the following inequality is satisfied (step S211).
Expansion target value>"Pi limit value normal value (maximum)" of the current line-"Pi limit value current value" of the current line
If the above inequality holds, the target value cannot be achieved even if the reduction of the current line is maximized. If not, the target value can be achieved if the reduction of the current line is canceled to the maximum extent. Can be achieved.

Therefore, if the determination result in step S211 is affirmative, the management apparatus 12 sets the “Pi limit value normal value (maximum)” of the current row as the transmission value (that is, cancels the reduction), and the operation content of the current row. (That is, “Pi limit value transmission”) is performed (step S212).
After performing step S212, the management apparatus 12 sets the expansion target value from the current value ("Pi limit value normal value (maximum)" of the current line, which is the transmission value)-"Pi limit value of the current line". “Current value”) is replaced with a value obtained by subtracting (current value “Pi limit value current value” in the current line), and “Pi limit value normal value (maximum value)” in the current line as a transmission value (step S214). .

  Thereafter, the management device 12 decrements the current line of the PdcpPals total value reduction list by one (step S215), and ends the process.

On the other hand, if the determination result in step S211 is negative, the management device 12 uses a value obtained by adding the expansion target value to the “Pi limit value current value” in the current row as a transmission value (that is, canceling the PdcpPals total value reduction). ), The operation content of the current line (that is, “Pi limit value transmission”) is executed (step S216).
Thereafter, the management device 12 replaces the “Pi limit value current value” of the current row with a transmission value (a value obtained by adding the enlargement target value to the “Pi limit value current value” of the current row) (step S217), and enlarges. The target value is set to “0” (step S218), and the process is terminated.

[Operation of the current line of the PdcnPals total value reduction list (subroutine DLn)]
FIG. 29 is a flowchart showing a specific example of “execute operation” (subroutine DLn) on the current line of the PdcnPals total value reduction list.
As shown in FIG. 29, in the subroutine DLn, the system management apparatus 12 first determines whether or not the current line of the PdcnPals total value reduction list (FIG. 24) is “0” (step S301).

When the current row is 0, the management device 12 sets the current row of the list to “1” (step S302), determines the operation content of the first row of the list (step S303), and the current row is “0”. If not, the operation content of the current line is determined (step S303).
If it is determined in step S303 that the operation content of the current row is “transmission request transmission”, the management apparatus 12 performs the operation content (that is, “transmission request transmission”) (step S304). This has the same effect as performing the operation of transmitting the Po limit value with the “Po limit value emergency limit value (minimum)” of the current line as the transmission value. As a result, the normal load devices 10, 11, and 16 are disconnected, and the Po limit value there becomes the emergency limit value (minimum).

Next, the management apparatus 12 sets the PdcnPals total value reduction amount target value from the current value (“Po limit value current value of the current row” − “Po limit value emergency limit value (minimum) of the current row corresponding to the transmission equivalent value). ")" Is replaced with a value obtained by subtracting ("Po limit value current value" in the current line), and "Po limit value emergency limit value (minimum)" in the current line corresponding to the transmission equivalent value (step S306).
Thereafter, the management device 12 increments the current line in the PdcnPals total value reduction list by one (step S307), and ends the process.

If it is determined in step S303 that the operation content on the current line is “Po limit value transmission”, the management apparatus 12 determines whether or not the following inequality is satisfied (step S308).
PdcnPals total value reduction amount target value>"Po limit value current value" of the current line-"Po limit value emergency limit value (minimum)" of the current line
If the above inequality holds, the target value cannot be achieved even if the reduction by the current line is maximized. If not, the target value can be achieved by performing the reduction by the current line to the maximum extent.

Therefore, if the determination result in step S308 is affirmative, the management apparatus 12 uses the “emergency limit value (minimum) of Po limit value” of the current line as a transmission value, and the operation content of the current line (ie, “Po limit). Value transmission ") is performed (step S309).
After performing step S309, the management apparatus 12 performs processing from step S305 to step S307.

On the other hand, when the determination result of step S308 is negative, the management device 12 uses the value obtained by subtracting the PdcnPals total value reduction target value from the “Po limit value current value” of the current row as the transmission value. The operation content (ie, “Po limit value transmission”) is executed (step S310).
Thereafter, the management device 12 replaces the “Po limit value current value” of the current row with a transmission value (a value obtained by subtracting the PdcnPals total value reduction amount target value from the “Po limit value current value” of the current row) (step S311), the PdcnPals total value reduction amount target value is set to “0” (step S312), and the process is terminated.

If it is determined in step S303 that the operation content on the current line is “Pi limit value transmission”, the management apparatus 12 determines whether or not the following inequality is satisfied (step S313).
PdcnPals total value reduction amount target value>"Pi limit value emergency limit value (maximum)" of the current line-"Pi limit value current value" of the current line
If the above inequality holds, the target value cannot be achieved even if the reduction by the current line is maximized. If not, the target value can be achieved by performing the reduction by the current line to the maximum extent.

Therefore, if the determination result in step S313 is affirmative, the management apparatus 12 uses the “Pi limit value emergency limit value (maximum)” of the current line as the transmission value, and the operation contents of the current line (ie, “Pi limit”). Value transmission ") is performed (step S314).
After performing step S314, the management apparatus 12 sets the PdcnPals total value reduction amount target value from the current value ("Emergency limit value of Pi limit value (maximum)" of the current line, which is the transmission value)-current line (“Pi limit value current value”) of the current line is replaced with a value obtained by subtracting “Pi limit value current value” of the current line (step S315), and “Pi limit value emergency limit value (maximum)” of the current line as the transmission value. (Step S316).

  Thereafter, the management device 12 increments the current line of the PdcnPals total value reduction list by one (step S317), and ends the process.

On the other hand, if the determination result of step S313 is negative, the management device 12 uses the value obtained by adding the PdcnPals total value reduction amount target value to the “Pi limit value current value” of the current row as the transmission value, and The operation content (that is, “Pi limit value transmission”) is executed (step S318).
Thereafter, the management device 12 replaces the “Pi limit value current value” of the current row with a transmission value (a value obtained by adding the “PicnPals total value reduction amount target value” to the “Pi limit value current value” of the current row) (step S319), the PdcnPals total value reduction amount target value is set to “0” (step S320), and the process is terminated.

[PdcnPals Total Value Reduction List Operation Cancellation (Subroutine CLn)]
FIG. 30 is a flowchart showing a specific example of “operation cancellation” (subroutine CLn) of the current line in the PdcnPals total value reduction list.

  In the PdcnPals total value reduction process (subroutine RDn: FIG. 26), if the determination result in step ST21 is negative, that is, if “PdcnPals total value reduction amount target value” is a negative number, “−PdcnPals total value” The underpower reduction has been excessively performed by the “reduction amount target value”, and in order to cancel it, the subroutine CLn is repeated until the determination in step ST24 becomes negative. Therefore, in the subroutine CLn in this case, “-PdcnPals total value reduction amount target value” is set as “expansion target value”, and the operation content of the current line in the PdcnPals total value reduction list is canceled.

  On the other hand, in the PdcpPals total value reduction process (subroutine RDp: FIG. 25), if the determination result in step ST11 is affirmative, that is, “PdcpPals total value reduction amount target value” is a positive number, In order to cancel the past operation of reducing the insufficient power, the subroutine CLn is repeated until the determination in step ST12 becomes negative. Therefore, in the subroutine CLn in this case, “PdcpPals total value reduction amount target value” is set as “expansion target value”, and the operation content of the current line in the PdcnPals total value reduction list is canceled.

  As shown in FIG. 30, in the subroutine CLn, the system management apparatus 12 first determines the operation content in the current line of the PdcnPals total value reduction list (FIG. 24) (step S401).

  If it is determined in step S401 that the operation content of the current row is “transmission request transmission”, the management apparatus 12 cancels the operation content (that is, “parallel request transmission”) (step S402). This has the same effect as the operation of transmitting the Po limit value using the “Po limit value normal value (maximum)” in the current row as the transmission value. As a result, the normal load devices 10, 11, and 16 are arranged in parallel, and the Po limit value there becomes a normal value (maximum).

Next, the management device 12 subtracts the expansion target value from the current value (“Po limit value normal value (maximum)” of the current line corresponding to the transmission equivalent value− “Po limit value current value” of the current line). It is replaced with a value (step S403), and “Po limit value current value” of the current line is replaced with “Po limit value normal value (maximum)” of the current line corresponding to the transmission equivalent value (step S404).
Thereafter, the management apparatus 12 decrements the current line of the PdcnPals total value reduction list by one (step S405), and ends the process.

If it is determined in step S401 that the operation content of the current line is “Po limit value transmission”, the management apparatus 12 determines whether or not the following inequality is satisfied (step S406).
Expansion target value>"Po limit value normal value (maximum)" of the current line-"Po limit value current value" of the current line
If the above inequality holds, the target value cannot be achieved even if the reduction of the current line is maximized. If not, the target value can be achieved if the reduction of the current line is canceled to the maximum extent. Can be achieved.

Therefore, if the determination result in step S406 is affirmative, the management apparatus 12 sets the normal value (maximum) of the Po limit value as the transmission value (that is, cancels the PdcnPals total value reduction), and the operation content (that is, the current line) “Po limit value transmission”) is performed (step S407).
After performing step S407, the management apparatus 12 performs processing from step S403 to step S405.

On the other hand, when the determination result of step S406 is negative, the management apparatus 12 uses the value obtained by adding the expansion target value to the “Po limit value current value” of the current row as a transmission value (that is, canceling the PdcnPals total value reduction). ), The operation content of the current line (ie, “Po limit value transmission”) is executed (step S408).
Thereafter, the management device 12 replaces “Po limit value current value” of the current row with a transmission value (a value obtained by adding the enlargement target value to “Po limit value current value” of the current row) (step S409), and enlargement The target value is set to “0” (step S410), and the process ends.

If it is determined in step S401 that the operation content on the current line is “Pi limit value transmission”, the management apparatus 12 determines whether or not the following inequality is satisfied (step S411).
Expansion target value>"Pi limit value current value" of the current line-"Pi limit value normal value (minimum)" of the current line
If the above inequality holds, the target value cannot be achieved even if the reduction of the current line is maximized. If not, the target value can be achieved if the reduction of the current line is canceled to the maximum extent. Can be achieved.

Therefore, if the determination result in step S411 is affirmative, the management device 12 sets the “normal value (minimum) of the Pi limit value” of the current row as the transmission value (that is, cancels the PdcnPals total value reduction), and (I.e., “Pi limit value transmission”) is executed (step S412).
After performing step S412, the management apparatus 12 calculates the expansion target value from the current value ("Pi limit value current value of the current line"-"Pi limit value normal value of the current line that is the transmission value ( (Minimum) ”) is replaced with a value obtained by subtracting“ min. .

  Thereafter, the management device 12 decrements the current line in the PdcnPals total value reduction list by one (step S415), and ends the process.

On the other hand, if the determination result in step S411 is negative, the management device 12 uses the value obtained by subtracting the expansion target value from the “Pi limit value current value” in the current row as a transmission value (that is, canceling the PdcnPals total value reduction). ), The operation content of the current line (that is, “Pi limit value transmission”) is executed (step S416).
Thereafter, the management device 12 replaces the “Pi limit value current value” of the current row with a transmission value (a value obtained by subtracting the enlargement target value from the “Pi limit value current value” of the current row) (step S417). The target value is set to “0” (step S418), and the process ends.

[Execution example of PdcpPals total value reduction]
FIG. 31 is an explanatory diagram illustrating an execution example of the reduction of the PdcpPals total value.
As described above, in the subroutine RDp (FIG. 25) of the PdcpPals total value reduction process, when it is necessary to mitigate excess power in the DC distribution line 1 (Yes in step ST11), the management device 12 uses the PdcnPals After canceling the operation of the current line of the total value reduction list (subroutine CLn: FIG. 30) (provided that the current line of the list> 0 is satisfied), execute the operation of the current line of the PdcpPals total value reduction list (subroutine DLp : FIG. 27) is executed.

In other words, using the explanatory diagram of FIG. 31, the management apparatus 12 first starts with the current value in order from the current row (row number = 8 in the example) of the PdcnPals total value reduction list, as indicated by an arrow A1. Release the operation from the emergency limit value to the normal value in descending order.
Thereafter, the management device 12 performs the operation from the normal value to the emergency limit value in ascending order in order from the first line (line number = 1) of the PdcpPals total value reduction list as indicated by an arrow A2. .

Here, in the PdcpPals total value reduction list, so-called “unnecessary and imminent” load devices that are not particularly essential for the user are selected for the target devices of row numbers = 1 to 6, and the subsequent row numbers 7 and A natural energy power generation device (in the illustrated example, solar power generation and wind power generation) is selected as the target device 8.
Further, in the PdcnPals total value reduction list, a power generation device other than the natural energy power generation device (in the illustrated example, gas power generation and diesel power generation) is selected as the target device of line numbers = 1 and 2, and the subsequent line numbers 3 to 3 are selected. For the target device 8, a normal load device that is not unnecessary and urgent is selected.

Therefore, when the PdcpPals total value is reduced in the order of arrow A1 → arrow A2 in FIG. 31 in accordance with the row numbers of both lists, the following priorities a1) to a4) for each target device in the system: The process will be executed.
a1) Increase the load power of a normal load device (PdcnPals total value reduction list line number = 8 to 3) whose use has been restricted for the current control.

a2) Reduce the generated power of the power generation devices other than the natural energy power generation devices (PdcnPals total value reduction list line numbers = 2 to 1).
a3) Increasing the load power of the unnecessary load device (PdcpPals total value reduction list line numbers = 1 to 6).
a4) Reduce the generated power of the natural energy power generation apparatus (PdcpPals total value reduction list row numbers = 7 to 8).

  Thus, in this embodiment, since the priority (a2) for reducing the generated power of the power generator other than the natural energy power generator is higher than the priority (a4) for reducing the generated power of the natural energy power generator, the generated power When the PdcpPals total value (excessive power in the DC distribution line 1) is reduced by reducing the power generation power generated without using natural energy is preferentially reduced. Therefore, it is a preferred priority from the viewpoint of environmental protection.

  In addition, since the priority (a1) for increasing the load power of a normal load device that is not unnecessary and urgent is higher than the priority (a3) for increasing the unnecessary and urgent load power, the load power is increased and the PdcpPals total value (DC When the excess power in the distribution line 1 is reduced, the load power of a normal load device that is not unnecessary and urgent is preferentially increased. Therefore, it is a priority that can improve user convenience.

[Execution example of reduction of PdcnPals total value]
FIG. 32 is an explanatory diagram of an execution example of the PdcnPals total value reduction.
As described above, in the subroutine RDn (FIG. 26) of the PdcnPals total value reduction process, when it is necessary to mitigate insufficient power in the DC distribution line 1 (Yes in step ST21), the management device 12 uses the PdcpPals After the operation cancellation of the current line of the total value reduction list (subroutine CLp: FIG. 28) is executed (provided that the current line of the list is> 0), the operation of the current line of the PdcnPals total value reduction list is performed (subroutine DLn). : FIG. 29) is executed.

In other words, using the explanatory diagram of FIG. 32, the management device 12 starts with the current value in order from the current row (row number = 8 in the example) of the PdcpPals total value reduction list, as indicated by an arrow A3. Release the operation from the emergency limit value to the normal value in descending order.
Thereafter, the management device 12 performs the operation from the normal value to the emergency limit value in ascending order in order from the first line (line number = 1) of the PdcnPals total value reduction list, as indicated by an arrow A4. .

Therefore, when the reduction of the PdcnPals total value is executed in the order of arrow A3 → arrow A4 in FIG. 32 in accordance with the row numbers of both lists, the following priorities b1) to b4) are applied to each target device in the system. Processing will be executed.
b1) Increasing the generated power of the natural energy power generation device (PdcpPals total value reduction list line numbers = 8 to 7) that has limited power generation for the current control.

b2) Reduce the load power of the unnecessary load device (PdcpPals total value reduction list line number = 6 to 1).
b3) Increasing the generated power of the power generation devices other than the natural energy power generation devices (line numbers of the PdcnPals total value reduction list = 1 to 2).
b4) Reduce the load power of normal load devices other than b2) (PdcnPals total value reduction list line number = 3 to 8).

  Thus, in this embodiment, the priority (b1) for increasing the generated power of the natural energy power generation apparatus is higher than the priority (b3) for increasing the generated power of the power generation apparatuses other than the natural energy power generation apparatus. When the total value of PdcnPals (insufficient power in the DC distribution line 1) is reduced by increasing the power generation power generated using natural energy is preferentially increased. Therefore, it is a preferred priority from the viewpoint of environmental protection.

  In addition, since the priority (b2) for reducing the load power of the unnecessary and urgent load device is higher than the priority (b4) for increasing the normal load power that is not unnecessary and urgent, the load power is reduced and the PdcnPals total value ( When the power shortage in the DC distribution line 1 is reduced, the load power of the unnecessary load device is preferentially reduced. Therefore, the priority order is such that the load power can be reduced without significantly affecting the convenience of the user.

[Effect of power supply and demand control]
As described above, according to the DC power distribution system of the present embodiment, the system management device 12 performs the first supply and demand control (see FIG. 21), so the DC power distribution line 1 is caused by excess power or insufficient power with respect to the DC power distribution line 1. Even if the voltage Vdc deviates from the standard value, either the PdcpPals total value or the PdcnPals total value is reduced, and the voltage of the DC distribution line 1 is returned to within the predetermined range of the standard value.
Therefore, the failure of the second Vdc control by the DC / AC converter 13 for AC power system can be stopped in a short time, and the voltage Vdc of the DC distribution line 1 can be maintained within a predetermined range.

In addition, according to the DC power distribution system of the present embodiment, the system management device 12 performs the second supply / demand control (see FIG. 22) even when the second Vdc control is successful. The power supply and demand state of PoPals maximum possible value> PdcpPals total value and PiPals maximum possible value> PdcnPals total value is maintained with a margin of two threshold values Th1 and Th2.
Therefore, the excess power PdcpPals or the insufficient power PdcnPals in the DC distribution line 1 can be reliably covered by the reverse power flow to the AC power system 14 or the forward power power from the AC power system 14. Vdc can be more reliably stabilized.

[Other variations]
The above-described embodiments are merely examples, and do not limit the scope of rights of the present invention. The scope of the present invention is defined by the terms of the claims, and all modifications within the scope and equivalents of the claims are included in the present invention.

  For example, in the above-described embodiment, in the first supply and demand control by the system management device 12, whether or not to reduce the PdcpPals total value or the PdcnPals total value is determined based on the voltage Vdc of the DC distribution line 1. (Steps S4 and S6 in FIG. 21), based on the output power to the AC power system converter 13 and the input power from the converter 13, it may be determined whether or not to reduce them.

  That is, when the PoPals maximum possible total value of the DC / AC converter 13 for the AC power system is smaller than the PdcpPals total value, the system management device 12 sets the PoPals maximum possible value total value to be equal to or greater than the PdcpPals total value. If the PdcpPals total value is reduced and the PiPals maximum possible value total value of the DC / AC converter 13 for the AC power system is smaller than the PdcnPals total value, the PiPals maximum possible value total value is equal to or greater than the PdcnPals total value. You may decide to perform 1st supply-and-demand control by reducing the said PdcnPals total value.

Further, in the above-described embodiment, the system management device 12 can perform both the first and second supply / demand control. However, the system management device 12 can perform any of the first and second supply / demand control. Only one of them may be performed.
Furthermore, in the above-described embodiment, the system that performs both the first and second Vdc control by the conversion devices 2 and 13 and the first and second supply and demand control by the system management device 12 is exemplified. You may decide to do only.

In the above-described embodiment, since the system configuration includes the AC load device 16 under the grid, the Pio maximum possible value of the DC / AC conversion device 13 for the AC power system of interest is considered in consideration of the variation of the load power Pals. Po maximum possible value≈Psb maximum possible value + Pals subtotal value, Pi maximum possible value≈Psf maximum possible value−Pals subtotal value (calculation body is system management device 12 or DC / AC converter for AC power system) 13).
However, the DC power distribution system of the present invention may have a system configuration that does not have the AC load device 16 under the system. In this case, Po maximum possible value≈Psb maximum possible value, Pi maximum possible value≈Psf maximum Possible value.

In the above-described embodiment, the load power Pals of the AC load device 16 under the DC / AC conversion device 13 for the AC power system is reduced by the excess power Pdcp total value or the insufficient power Pdcn total value in the DC distribution line 1. Therefore, the Pdcnp total value is replaced with a PdcnpPals total value considering the Pals total value.
Therefore, when there is no AC load device 16 under the system or when the load power of the AC load device 16 is not targeted for reduction, the supply and demand for reducing the Pdcp total value and the Pdcn total value without performing the replacement process. Control may be performed.

Specifically, the supply and demand control that does not reduce the load power Pals of the AC load device 16 under the system is specifically the processing content in which the term “Pals” is omitted from the flowcharts included in FIGS. Can be realized.
In this case, in the first supply and demand control, when the voltage Vdc of the DC distribution line 1 falls outside the predetermined range from the Vdc target value (standard), the Pdcp total value or Pdcn is set so that the voltage falls within the predetermined range. The control is to reduce the total value.

  In the first supply and demand control, when the Po maximum possible value total value is smaller than the Pdcp total value, the Pdcp total value is reduced so that the Po maximum possible value total value is equal to or greater than the Pdcp total value, and Pi maximum is possible. When the value total value is smaller than the Pdcn total value, the Pdcn total value may be reduced so that the Pi maximum possible value total value is equal to or greater than the Pdcn total value.

  Further, the second supply-demand control reduces the Pdcp total value so that the difference obtained by subtracting the Pdcp total value from the Po maximum possible value total value is equal to or greater than the first threshold, and the Pdcn total value is calculated from the Pi maximum possible value total value. The Pdcn total value is reduced so that the subtracted difference is equal to or greater than the second threshold.

  In the above-described embodiment, since the system configuration includes the AC load device 16 under the grid, the Pio maximum possible value of the DC / AC conversion device 13 for the AC power system of interest is considered in consideration of the variation of the load power Pals. Po maximum possible value≈Psb maximum possible value + Pals subtotal value, Pi maximum possible value≈Psf maximum possible value−Pals subtotal value (calculation body is system management device 12 or DC / AC converter for AC power system) 13).

However, the DC power distribution system of the present invention does not consider the fluctuation of the Pals subtotal value one by one, but instead considers the “lower limit (= 0)” and “upper limit” of the Pals subtotal value. Also good.
In this case, Po maximum possible value≈Psb maximum possible value + Pals subtotal value lower limit value = Psb maximum possible value, Pi maximum possible value≈Psf maximum possible value−Pals subtotal value upper limit value. Note that the upper limit value of the Pals subtotal value is a value equal to or less than the maximum Psf possible value.

The AC power system DC / AC conversion device 13 acquires the upper limit value of the Pals subtotal value for the AC load device 16 under its control from the system management device 12 by communication.
Also, the AC load device 16 directly connected to the AC power system DC / AC converter 13 acquires the upper limit value of the Pals subtotal value from the system management device 12 by communication, and Po exceeds the upper limit value of the Pals subtotal value. The upper limit value of the Pals subtotal value may be set to be equal to or greater than the maximum possible value of Po of the AC load device 16, so that the Po of the AC load device 16 sets the upper limit value of the Pals subtotal value. You may make it not exceed.

  Similarly, the AC load device branch device 15 directly connected to the AC power system DC / AC converter 13 acquires the upper limit value of the Pals subtotal value from the system management device 12 through communication, and the Po on the non-branch side is The branch device 15 may be operated so as not to exceed the upper limit value of the Pals subtotal value, or by setting the upper limit value of the Pals subtotal value to be equal to or greater than the maximum possible value of Po on the non-branch side of the branch device 15. The Po on the non-branching side may not exceed the upper limit of the Pals subtotal value.

  In the above-described embodiment, the load power Pals of the AC load device 16 under the DC / AC conversion device 13 for the AC power system is reduced by the excess power Pdcp total value or the shortage power Pdcn total value in the DC distribution line 1. Therefore, the Pdcnp total value is replaced with a PdcnpPals total value considering the Pals total value.

  In the case where the lower limit value (= 0) and upper limit value of the Pals subtotal value are taken into account instead of considering the fluctuation of the Pals subtotal value one by one, the subordinate of the DC / AC converter 13 for the AC power system Since the load power Pals of the AC load device 16 cannot be included in the reduction target of the excess power Pdcp total value or the shortage power Pdcn total value in the DC distribution line 1, the Pdcp total value or Pdcn is not performed without performing the above replacement process. Supply and demand control that reduces the total value may be performed.

Specifically, the supply and demand control that does not reduce the load power Pals of the AC load device 16 under the system is specifically the processing content in which the term “Pals” is omitted from the flowcharts included in FIGS. Can be realized.
In this case, in the first supply and demand control, when the voltage Vdc of the DC distribution line 1 falls outside the predetermined range from the Vdc target value (standard), the Pdcp total value or Pdcn is set so that the voltage falls within the predetermined range. The control is to reduce the total value.

  In the first supply and demand control, when the Po maximum possible value total value is smaller than the Pdcp total value, the Pdcp total value is reduced so that the Po maximum possible value total value is equal to or greater than the Pdcp total value, and Pi maximum is possible. When the value total value is smaller than the Pdcn total value, the Pdcn total value may be reduced so that the Pi maximum possible value total value is equal to or greater than the Pdcn total value.

  Further, the second supply-demand control reduces the Pdcp total value so that the difference obtained by subtracting the Pdcp total value from the Po maximum possible value total value is equal to or greater than the first threshold, and the Pdcn total value is calculated from the Pi maximum possible value total value. The Pdcn total value is reduced so that the subtracted difference is equal to or greater than the second threshold.

[Second Embodiment]
33 to 49 show a second embodiment of the present invention.
The difference between the second embodiment and the first embodiment shown in FIGS. 1 to 32 in the system configuration is that the DC / DC conversion device 3 for power storage device and the power storage device are clear as compared with FIG. 1 and FIG. 33. 7 is added.

However, also in the second embodiment, it is the DC / DC converter 2 for the power generator and the DC / AC converter 13 for the AC power system that performs the “Vdc control” that holds the voltage of the DC distribution line 1. The power storage device DC / DC conversion device 3 does not perform Vdc control.
Further, in the second embodiment, the system management device 12 regards the power storage device 7 in the case of “discharge” to supply power to the DC distribution line 1 as “power generation device” and returns “power” from the DC distribution line 1. The power storage device 7 in the case of "" is regarded as a "load device" and the above-described power supply and demand control is performed.

Hereinafter, the contents of the second embodiment will be described focusing on the differences from the first embodiment.
[Overall system configuration]
FIG. 33 is an overall configuration diagram of a DC power distribution system according to the second embodiment of the present invention.
As shown in FIG. 33, in the DC power distribution system of the second embodiment, the power storage device 7 is further connected to the DC power distribution system of the first embodiment shown in FIG. Is connected to the DC distribution line 1.

Also in the second embodiment, the “conversion device” denoted by reference numerals “2 to 5, 13” in FIG. 33 is identified only by the reference numerals (for example, “conversion device 2”). There are also cases where the use of each of the conversion devices 2 to 5 and 13 is referred to with a prefix as follows.
2: “DC / DC converter 2 for power generator” or “converter 2 for generator”
3: “DC / DC converter 3 for power storage device” or “converter 3 for power storage device”
4: "DC / DC converter 4 for DC load device" or "DC load device converter 4"
5: “DC / AC converter 5 for AC load device” or “AC device 5”
13: “AC / DC converter for AC power system 13” or “AC power system converter 13”

Also in the second embodiment, each “branch device” given the reference symbol “8, 9, 15” in FIG. 33 is also identified only by the reference symbol (for example, “branch device 8”). In some cases, the use of each branching device 8, 9, and 15 is designated with a prefix as follows.
8: “Branch device for DC load device 8”
9: “Branch device for AC load device 9”
15: “Branch device for AC load device 15”

Further, in the second embodiment, the branch device 15 and the AC load device 16 directly connected to the AC power system 14 without passing through the DC distribution line 1 are connected to the branch device 15 of “under system” and It may be referred to as an AC load device 16 under “system subordinate”.
Similarly, with respect to the branch device 9 and the AC load device 11 that are indirectly connected to the AC power system 14 via the DC distribution line 1 and are not under the system, the branch device 9 that is “under the system” and the “under the system” The AC load device 11 may be called.

  The power storage device 7 includes, for example, a redox flow battery, a lead battery, a Li ion battery, a NAS battery, a NI-Cd battery, a Ni-MH battery, an electric double layer capacitor, a Li ion capacitor, and the like.

The power storage device 7 is connected to the DC distribution line 1 via the DC / DC conversion device 3 for the power storage device.
The power storage device DC / DC conversion device 3 includes, for example, a bidirectional buck-boost chopper circuit. The step-up / step-down chopper circuit boosts the output voltage when the power storage device 7 is discharged and supplies power to the DC distribution line 1, and supplies the output voltage of the DC distribution line 1 when the power storage device 7 is charged. The power is supplied to the power storage device 7 by stepping down.

[System management device]
The system management device 12 according to the present embodiment has a communication function for exchanging information with the conversion device 3 in addition to the conversion devices 2, 4, 5, and 13. Information acquired from the conversion devices 2 to 5, and 13 Based on the above, power supply and demand control in the system is performed.
In addition, when the power generation device 6, the branching devices 8, 9, 15 or the load devices 10, 11, 16 are devices capable of power control, the system management device 12 uses one of them for power supply / demand control in the system. Exchange information with departments or all.

Furthermore, the system management device 12 can exchange information with the AC power system 14 through communication.
In this case, the system management device 12 and the AC power system 14 may exchange information by direct communication, or may exchange information by communication via the DC / AC conversion device 13 for AC power system.

Furthermore, the system management device 12 can also exchange information with the power storage device 7 through communication.
In this case, the system management device 12 and the power storage device 7 may exchange information through direct communication, or may exchange information through communication via the DC / DC conversion device 3 for power storage device.

That is, among the DC / DC conversion device 3 for power storage device 3 and the power storage device 7 added in the second embodiment, a device capable of exchanging information with the system management device 12 performs communication, power measurement, power control, and the like. And functions as means for executing power supply and demand control by the system management device 12.
As a communication method with the system management apparatus 12, for example, wired or wireless communication such as Ethernet (registered trademark), wireless LAN, and PLC (Power Line Communication) is used.

  The system management device 12 includes, as information necessary for power supply and demand control, input power Pi from the DC / DC converter 2 for the power generator to the DC distribution line 1, and DC / DC converter 4 for the DC load device from the DC distribution line 1. , Output power Po to the AC load device DC / AC converter 5, input / output power Pio between the DC distribution line 1 and the AC power system DC / AC converter 13, load power Po of the AC load device 16 under the system In addition to (= Pals), the input / output power Pio between the DC distribution line 1 and the DC / DC conversion device 3 for the power storage device is acquired.

  The system management device 12 includes the total value of the input power Pi acquired from the DC / DC conversion device 2 for power generation device, the DC / DC conversion device 3 for power storage device, the DC / DC conversion device 4 for DC load device, and the AC load device. The power generation amount of the power generation device 6 is set so that the deviation from the total value of the output power Po acquired from the DC / AC conversion device 5 for power storage and the DC / DC conversion device 3 for power storage device falls within a predetermined range. The DC conversion device 2 is adjusted, the discharge power or the charging power of the power storage device 7 is adjusted to the power storage device DC / DC conversion device 3, the load devices 10, 11, 16, the branch devices 8, 9, 15, DC Balance the power supply and demand in the system by de-paralleling the load device DC / DC conversion device 4 or the AC load device DC / AC conversion device 5 or adjusting the load power to the load devices 10, 11, 16. Electricity demand It performs control.

[Parameter definition]
(1) Parameters related to DC distribution line 1 Parameters related to DC distribution line 1 are basically the same as those in the first embodiment. However, the definition of the Pdcnp total value is different from that in the first embodiment due to the addition of a series of power storage device DC / DC converters 3 that do not perform Vdc control. That is, in the second embodiment, the calculation formulas for the Pdcn total value and the Pdcp total value are as follows, respectively.

Pdcn total value = Po total value of DC / DC converter 4 for DC load device
+ Po total value of DC / AC converter 5 for AC load device
+ Po total value of DC / DC converter 3 for power storage device
-Pi total value of DC / DC converter 2 for power generators
-Pi total value of DC / DC conversion device 3 for power storage device Pdcp total value = Pi total value of DC / DC conversion device 2 for power generation device
+ Pi total value of DC / DC converter 3 for power storage device
-Po total value of DC / DC converter 4 for DC load device
-Po total value of DC / AC converter 5 for AC load device
-Po total value of DC / DC converter 3 for power storage devices

The following parameters (2) to (6) are the same as those in the first embodiment.
(2) Parameters related to the power generator 6 (3) Parameters related to the DC load device 10 or the DC load device branch device 8 (4) Parameters related to the AC load device 11 or the AC load device branch device 9 not under the system (5) System Parameters related to subordinate AC load device 16 or AC load device branch device 15 (6) Parameters related to AC power system 14

(7) Parameter Pbd for power storage device 7: Discharge power of power storage device 7.
If a slight loss due to conversion is subtracted from Pbd, it becomes Pi of the DC / DC converter 3 for power storage device, and Pbd and Pi of the DC / DC converter 3 for power storage device are almost equal.
Pbd maximum possible value: the maximum discharge power that the power storage device 7 can discharge.
Under the control of the DC / DC conversion device 3 for power storage device, the actual discharge power Pbd becomes equal to or less than the maximum possible value of Pbd, and the Pi of the actual DC / DC conversion device 3 for power storage device is also the DC / DC conversion device 3 for power storage device. Pi is less than the maximum possible value.

The maximum possible value of Pbd can vary according to the internal electromotive force of power storage device 7. Since the internal electromotive force of the power storage device 7 increases or decreases in proportion to the amount of power stored in the power storage device 7, the maximum possible Pbd value can vary depending on the amount of power stored in the power storage device 7.
If a slight loss due to conversion is subtracted from the Pbd maximum possible value, the Pi maximum possible value of the power storage device DC / DC conversion device 3 is obtained, and the Pbd maximum possible value and the Pi maximum possible value of the power storage device DC / DC conversion device 3 are obtained. Are almost equal.

Pbc: charging power of the power storage device 7.
If a slight loss due to conversion is subtracted from Po of power storage device DC / DC conversion device 3, Pbc is obtained, and Po of power storage device DC / DC conversion device 3 is substantially equal.
Pbc maximum possible value: maximum charging power that can be charged by the power storage device 7.
Under the control of the DC / DC conversion device 3 for power storage device, the actual charging power Pbc becomes equal to or less than the maximum possible value of Pbc, and Po of the actual DC / DC conversion device 3 for power storage device is also the DC / DC conversion device 3 for power storage device. Po below the maximum possible value.

The maximum possible value of Pbc can vary according to the internal electromotive force of power storage device 7. Since the internal electromotive force of power storage device 7 increases or decreases in proportion to the amount of power stored in power storage device 7, the maximum possible value of Pbc can vary according to the amount of power stored in power storage device 7.
If a slight loss due to conversion is subtracted from the Po maximum possible value of the DC / DC conversion device 3 for the power storage device, it becomes the Pbc maximum possible value, and the Pbc maximum possible value and the Po maximum possible value of the DC / DC conversion device 3 for the power storage device Are almost equal.

Pbdc: Pbd or Pbc.
Excluding a slight loss due to conversion, Pbdc is Pio of the power storage device DC / DC conversion device 3, and Pbdc and Pio of the power storage device DC / DC conversion device 3 are substantially equal.
Vb is a terminal voltage of the power storage device 7.
Eb is the internal electromotive force of the power storage device 7.
Wb: the amount of electricity stored in the electricity storage device 7.
Rb: Internal resistance of the power storage device 7
Ibd: the discharge current of the power storage device 7.
Ibc: charging current of the power storage device 7
Ibdc: Ibd or Ibc.

[Functional configuration of DC / DC converter for power storage device]
FIG. 34 is a functional block diagram of DC / DC conversion device 3 for power storage device.
As shown in FIG. 34, the DC / DC converter 3 for a power storage device according to this embodiment includes, in order from the left in the figure, a transmission / reception unit 31, a measurement unit 32, a storage unit 33, a Pio calculation unit 34, a Pio control unit 36, and a PWM. A circuit 37 and a step-up / down chopper circuit 38 are included.

The transmission / reception unit 31 includes a communication interface that communicates with the system management device 12 and the power storage device 7. The measurement unit 32 includes the current Ibdc and voltage Vb on the power storage device 7 side, and the current Idcio and voltage Vdc on the DC distribution line 1 side. Sensors that measure
The storage unit 33 includes a memory that stores setting values notified from the system management apparatus 12 via the transmission / reception unit 31.

The transmission / reception unit 31 transmits the values of Vdc, Pio (= Vdc × Idcio) and Eb acquired from the measurement unit 32 to the system management device 12 in response to an acquisition request from the system management device 12. Further, the measurement unit 32 passes the values of Vdc, Pio, Vb, Eb, and Ibdc to the Pio control unit 36 at the subsequent stage.
The storage unit 33 stores the Pio limit value notified from the system management apparatus 12 and passes the stored Pio limit value to the Pio calculation unit 34.
In FIG. 3, the value of Eb is held in the measurement unit 32, but this is calculated by the measurement unit 32 based on Vb or Ibdc, or a signal depending on Eb output from the power storage device 7. In other cases, the value of Eb may be acquired from the power storage device 7 by communication and held in the storage unit 33.

  The Pio calculation unit 34 determines a “Pio target value” according to the Pio limit value notified from the system management apparatus 12, and outputs the determined target value to the Pio control unit 36.

Specifically, the Pio calculation unit 34 sets Pi target value = Pi limit value when Pi limit value ≠ 0, and sets Po target value = Po limit value when Po limit value ≠ 0. Set. Also, the Pio calculation unit 34 sets Pio target value = 0 when Pi limit value = 0 and Po limit value = 0.
The system management device 12 sets at least one of the Pi limit value and the Po limit value to “0”, and neither of the Pio limit values is set to non- “0”.

The Pio control unit 36 calculates a duty ratio necessary for the Pio value input from the measurement unit 32 to be the Pio target value by PI control (proportional integration control), and outputs the calculated value to the PWM circuit 37. To do.
However, when the Pio target value exceeds the Pio maximum possible value, the Pio control unit 36 PI-controls the duty ratio necessary for the Pio value input from the measurement unit 32 to be the Pio maximum possible value ( Calculate by proportional integral control).

The PWM circuit 37 switches the transistors of the step-up / step-down chopper circuit 38 at the duty ratio calculated as described above.
As a result, the power Pi input to the DC distribution line 1 is the Pi maximum value obtained by subtracting a slight loss due to conversion from the Pi limit value notified from the system management device 12 or the maximum possible Pbd discharge value. The power value Po which is the smaller one of the possible values or the power Po output from the DC distribution line 1 is the Po limit value notified from the system management device 12 or the maximum charge power Pbc possible The power value is controlled to be the smaller one of the Po maximum possible value obtained by adding a slight loss due to conversion to the value.

[Change in Vdc for each power supply / demand situation]
35 to 39 are explanatory diagrams showing the power supply / demand situation of the DC power distribution system according to the second embodiment in the states 1 to 5 of FIGS. 13 and 14 described above, respectively.

That is, FIG. 35 shows the power supply / demand situation in state 1 of FIG. 13, which satisfies the following inequality and equality, and for each Vdc Ts by the DC / AC converter 13 for AC power system. This is a power supply and demand situation when the power control (second Vdc control) for setting the average value of Vdcm to Vdcm is successful.
Pdcp total value ≥ 0 (excessive power state)
Pdcp total value ≦ total value of Po maximum possible value of DC / AC conversion device 13 for AC power system AC Po value of DC / AC conversion device 13 for AC power system = Pdcp total value

As shown in FIG. 35, in this case, (generated power + discharge power) exceeds (load power + charge power), but as a result of the second Vdc control by the DC / AC converter 13 for AC power system, the surplus is obtained. Power is reversely flowed to the AC power system 14.
In this case, the average value of Vdc for each Ts is maintained at Vdcm, and the value of (Vdch−Vdc) does not decrease. For this reason, in the power control (first Vdc control) in which Vdc is set to Vdch by the DC / DC converter 2 for the power generator, the necessary Pi becomes large due to the effect of the I control of the PI control, and the Pi maximum possible value is DC. Input to distribution line 1.

FIG. 36 shows the power supply and demand situation in state 2 of FIG. 13, which satisfies the following inequality and equation and is the average of Vdc for each Ts by the DC / AC converter 13 for AC power system. This is a power supply / demand situation when the power control (second Vdc control) for setting the value to Vdcm is about to fail.
Pdcp total value ≥ 0 (excessive power state)
Pdcp total value> Total value of Po maximum possible value of DC / AC conversion device 13 for AC power system AC Total value of Po of DC / AC conversion device 13 for AC power system = Total value of Po maximum possible value of the conversion device 13

  As shown in FIG. 36, in this case, (generated power + discharge power) exceeds (load power + charge power), and as a result of the second Vdc control by the DC / AC converter 13 for AC power system, the excess power is obtained. Is supplied to the AC power system 14, but excess power that cannot be processed yet is supplied to the DC distribution line 1, which causes an increase in Vdc.

FIG. 37 shows the power supply and demand situation in state 3 of FIG. 13, which satisfies the following inequality and equation, and is the average of Vdc for each Ts by the DC / AC converter 13 for AC power system. Although the power control (second Vdc control) for setting the value to Vdcm has failed, the power control (first Vdc control) for setting Vdc to Vdch by the DC / DC converter 2 for the power generator has succeeded. This is the situation of electricity supply and demand.
Pdcp total value ≥ 0 (excessive power state)
Pdcp total value = total value of Po maximum possible value of DC / AC conversion device 13 for AC power system AC total value of Po of DC / AC conversion device 13 for AC power system = total value of Po maximum possible value of conversion device 13

  As shown in FIG. 37, in this case, (generated power + discharge power) exceeds (load power + charge power), and cannot be processed even by the second Vdc control by the DC / AC converter 13 for AC power system. Even if Vdc rises due to electric power, as a result of the first Vdc control by DC / DC converter 2 for power generators, the generated power for excess power that could not be processed by DC / AC converter 13 for AC power system Will be suppressed.

FIG. 38 shows the power supply and demand situation in state 4 of FIG. 14, which satisfies the following inequality and equation and is the average of Vdc for each Ts by the DC / AC converter 13 for AC power system. This is the power supply / demand situation when the power control (second Vdc control) for setting the value to Vdcm is successful.
Pdcn total value ≧ 0 (power shortage state)
Pdcn total value ≦ total value of Pi maximum possible value of DC / AC converter 13 for AC power system Pi total value of DC / AC converter 13 for AC power system = Pdcn total value

As shown in FIG. 38, in this case, (generated power + discharge power) is lower than (load power + charge power), but as a result of the second Vdc control by the DC / AC converter 13 for AC power system, the shortage is not achieved. Electric power is forward-flowed from the AC power system 14, and the average value of Vdc for each Ts is maintained at Vdcm.
In this case, the average value of Vdc for each Ts is maintained at Vdcm, and the value of (Vdch−Vdc) does not decrease. For this reason, in the power control (first Vdc control) in which the DC / DC converter 2 for power generator sets Vdc to Vdch, the necessary Pi becomes large due to the effect of the I control of the PI control, and the Pi maximum possible value is DC. Input to distribution line 1.

FIG. 39 shows the power supply / demand situation in state 5 in FIG. 14, which satisfies the following inequality and equation, and is the average of Vdc for each Ts by the DC / AC converter 13 for AC power system. This is the power supply / demand situation when the power control (second Vdc control) for setting the value to Vdcm has failed.
Pdcn total value ≧ 0 (power shortage state)
Pdcn aggregate value> Pi maximum possible value of AC power system DC / AC converter 13 Pi total value of AC power system DC / AC converter 13 = Pi maximum possible value of the converter 13 In such a case, (generated power + discharge power) is less than (load power + charge power), and as a result of the second Vdc control by the DC / AC converter 13 for the AC power system, the shortage of power flows forward from the AC power system However, there is still insufficient power that cannot be processed, and this causes a decrease in Vdc.

  Further, when Vdc falls, (Vdc−Vdc) increases, so Pi required for power control (first Vdc control) for DC / DC converter 2 for the power generator to change Vdc to Vdc increases. Power control is performed so that the Pi maximum possible value is input to the DC distribution line 1 while exceeding the Pi maximum possible value. Therefore, in this case, Vdc is not maintained at Vdch.

[Effect of Vdc control]
As described above, also in the DC power distribution system of the second embodiment to which the series of power storage device DC / DC conversion devices 3 is added, the power generation device DC / DC conversion device 2 and the AC power system DC / AC conversion device 13. In the case of the first embodiment in which the first Vdc control and the second Vdc control are performed independently of each other, so that the Vdc of the DC distribution line 1 can be maintained within a predetermined range and does not have the series. The same effect can be obtained.

[Power supply and demand control by system management device]
Also in the second embodiment, the system management device 12 is similar to the case of the first embodiment in order to support the establishment of Vdc control (second Vdc control) by the DC / AC converter 13 for AC power system. 1st and 2nd supply-and-demand control is performed.
However, in the second embodiment, since a series of power storage device DC / DC converters 3 is added, the contents of power supply and demand control are slightly different from those in the first embodiment. Hereinafter, the power supply and demand control in the second embodiment will be described focusing on the differences.

  In the second embodiment, the system management device 12 communicates with the conversion devices 2, 4, 5, 13, branch devices 8, 9, 15, load devices 10, 11, 16, the power generation device 6, the AC power system 14, and the like. In addition, information is also exchanged with the conversion device 3 and the power storage device 7, and the above-described first and second supply / demand control is performed based on the measured values obtained by the information exchange.

The measured values and calculated values used by the system management device 12 for power supply and demand control are summarized as follows.
・ Vdc measurement values of arbitrary converters 2 to 5 and 13 ・ Po measurement value of DC / DC conversion device 4 for DC load device ・ Po measurement value of DC / AC conversion device 5 for AC load device ・ DC / DC for power generation device Pi measurement value of DC converter 2-Pals subtotal value under DC / AC converter 13 for AC power system. This calculation method is the same as that in the first embodiment.

-PdcnPals total value = -PdcpPals total value In the second embodiment, the above calculation formula is calculated by the following formula.
PdcnPals total value = Σ (Po measurement value of DC / DC converter 4 for DC load device)
+ Σ (Po measured value of DC / AC converter 5 for AC load device)
+ Σ (Po measured value of DC / DC converter 3 for power storage device)
-Σ (Pi measurement value of DC / DC converter 2 for power generator)
-Σ (Pi measurement value of DC / DC converter 3 for power storage device)
+ Σ (Pals subtotal value under DC / AC converter 13 for AC power system)

・ Psfb maximum possible value of AC power system 14 ・ PioPals maximum possible value total value of DC / AC converter 13 for AC power system = Σ (PioPals maximum possible value of DC / AC converter 13 for AC power system)
The PiPals maximum possible value of each DC / AC converter 13 for AC power system 13 is calculated by subtracting a slight loss due to conversion from the Psf maximum possible value, and the PoPals maximum possible value is the Psb maximum possible value, Calculate by adding a small loss due to conversion.

When reducing the PdcnpPals total value, the system management device 12 transmits at least one command of “Pio limit value”, “disconnection request”, and “parallel request” to the corresponding device.
Specifically, when the PdcpnPals total value is reduced, the management device 12 transmits a “Pi limit value” to at least one of the DC / DC conversion device 2 for power generation device 2 and the power generation device 6 or for the power storage device. A “Pio limit value” is transmitted to the DC / DC converter 3.

  Alternatively, when the management device 12 reduces the PdcnPPals total value, the DC load device DC / DC converter 4, the DC load device branch device 8, the DC load device 10, and the AC load device DC / AC converter 5, Transmit Po limit value, disconnection request, or parallel request to at least one of branch device 9 for AC load device, AC load device 11, branch device 15 of AC power system 14 series, and AC load apparatus 16 of the series. To do.

[List used for PdcnpPals total value reduction processing]
40 shows the “PdcpPals total value reduction list” stored in the system management apparatus 12 of the second embodiment, and the upper list of FIG. 41 is stored in the system management apparatus 12 of the second embodiment. The “PdcnPals total value reduction list” is shown.

As apparent from a comparison between FIG. 40 and FIG. 23, the “PdcpPals total value reduction list” (FIG. 40) of the second embodiment is the row number of the “PdcpPals total value reduction list” (FIG. 23) of the first embodiment. = 1, a Po limit value transmission operation for the power storage device DC / DC conversion device 3 is inserted.
Therefore, as shown in the operation table in the lower part of FIG. 40, the target of the PdcpPals total value reduction list includes the DC / DC converter 3 for power storage device. When the “Po limit value” is transmitted to the DC / DC converter 3 for the power storage device, the limit value of the charging power is expanded in the range from the normal value (minimum) to the emergency limit value (maximum), and the PdcpPals total value Contributes to reduction.

41 and 24, the “PdcnPals total value reduction list” (FIG. 41) of the second embodiment is the same as the “PdcnPals total value reduction list” (FIG. 24) of the first embodiment. In this configuration, the operation of transmitting the Pi limit value to the DC / DC converter 3 for power storage device is inserted in the row number = 1.
Therefore, as shown in the operation table in the lower part of FIG. 41, the target of the PdcnPals total value reduction list includes the DC / DC converter 3 for power storage device. When the “Pi limit value” is transmitted to the DC / DC conversion device 3 for the power storage device, the limit value of the discharge power is expanded in the range from the normal value (minimum) to the emergency limit value (maximum), and the PdcnPals total value Contributes to reduction.

[First supply and demand control]
The contents of “first supply and demand control” in the second embodiment are the same as those in FIG.
However, in the second embodiment, the calculation formula of the PdcnPals total value (= −PdcpPals total value) in step S2 of FIG. 21 needs to be read as follows.
PdcnPals total value (= -PdcpPals total value)
= Σ (Po measurement value of DC / DC converter 4 for DC load device)
+ Σ (Po measured value of DC / AC converter 5 for AC load device)
+ Σ (Po measured value of DC / DC converter 3 for power storage device)
-Σ (Pi measurement value of DC / DC converter 2 for power generator)
-Σ (Pi measurement value of DC / DC converter 3 for power storage device)
+ Σ (Pals subtotal value under DC / AC converter 13 for AC power system)

[Second supply and demand control]
The contents of “second supply and demand control” in the second embodiment are the same as those in FIG.
However, in the second embodiment, the calculation formula for the PdcnPals total value (= −PdcpPals total value) in step S11 of FIG. 22 needs to be read as follows.
PdcnPals total value (= -PdcpPals total value)
= Σ (Po measurement value of DC / DC converter 4 for DC load device)
+ Σ (Po measured value of DC / AC converter 5 for AC load device)
+ Σ (Po measured value of DC / DC converter 3 for power storage device)
-Σ (Pi measurement value of DC / DC converter 2 for power generator)
-Σ (Pi measurement value of DC / DC converter 3 for power storage device)
+ Σ (Pals subtotal value under DC / AC converter 13 for AC power system)

[PdcpPals total value reduction processing]
The contents of “PdcpPals total value reduction processing” (subroutine RDp) in the second embodiment are the same as those in FIG.
However, in the second embodiment, when the operation of the current line of the PdcnPals total value reduction list (subroutine CLn: FIG. 30) performed when step ST12 of FIG. The process of canceling the expansion of the discharge power limit value from the power storage device 7 for reducing the shortage of electric power performed in the above is included.

Further, in the second embodiment, the operation of the current line of the PdcpPals total value reduction list (subroutine DLp: FIG. 27) performed when step ST13 in FIG. 7 includes a process of expanding the charging power limit value to 7.
Furthermore, in the second embodiment, excessive power mitigation performed in the subroutine DLp is performed to cancel the operation of the current line in the PdcpPals total value reduction list (subroutine CLp: FIG. 28) performed when Step ST14 in FIG. 25 is Yes. In order to cancel the overshoot of the operation, the process of canceling the expansion of the charge power limit value for the power storage device 7 for alleviating excess power performed in the past is included.

[PdcnPals total value reduction processing]
The contents of the “PdcnPals total value reduction process” (subroutine RDn) in the second embodiment are the same as those in FIG.
However, in the second embodiment, when the operation of the current line in the PdcpPals total value reduction list (subroutine CLp: FIG. 28) performed when step ST22 in FIG. The process of canceling the expansion of the charging power limit value for the power storage device 7 for excess power mitigation performed in the above is included.

Further, in the second embodiment, the operation of the current line of the PdcnPals total value reduction list (subroutine DLn: FIG. 29) performed when step ST23 in FIG. The process of expanding the discharge power limit value from 7 is included.
Furthermore, in the second embodiment, when the operation of the current line in the PdcnPals total value reduction list (subroutine CLn: FIG. 30) performed when step ST24 in FIG. In order to cancel the overshoot of the operation, the process of canceling the expansion of the discharge power limit value from the power storage device 7 for alleviating insufficient power performed in the past is included.

[Execution and cancellation of the current line of the list]
Since the following processes (FIGS. 27 to 30) in the second embodiment are the same as those in the first embodiment, detailed description thereof is omitted.
-PdcpPals total line value reduction list operation execution (subroutine DLp: FIG. 27)
Canceling the operation of the current line in the PdcpPals total value reduction list (subroutine CLp: FIG. 28)
・ Operation of the current line in the PdcnPals total value reduction list (subroutine DLn: FIG. 29)
Canceling the operation of the current line in the PdcnPals total value reduction list (subroutine CLn: FIG. 30)

[Execution example of PdcpPals total value reduction]
FIG. 42 is an explanatory diagram illustrating an execution example of the Pdcp total value reduction according to the second embodiment.
As described above, in the subroutine RDp (FIG. 25) of the PdcpPals total value reduction process, when it is necessary to mitigate excess power in the DC distribution line 1 (Yes in step ST11), the management device 12 uses the PdcnPals After canceling the operation of the current line of the total value reduction list (subroutine CLn: FIG. 30) (provided that the current line of the list> 0 is satisfied), execute the operation of the current line of the PdcpPals total value reduction list (subroutine DLp : FIG. 27) is executed.

In other words, the management device 12 starts with the current value in order from the current row (row number = 9 in the example) of the PdcnPals total value reduction list, as indicated by an arrow A1. Release the operation from the emergency limit value to the normal value in descending order.
Thereafter, the management device 12 performs the operation from the normal value to the emergency limit value in ascending order in order from the first line (line number = 1) of the PdcpPals total value reduction list as indicated by an arrow A2. .

  Here, in the PdcpPals total value reduction list, the DC / DC conversion device 3 for the power storage device is selected as the target device with the row number = 1, and is particularly essential for the user with the target devices with the row numbers = 2-7. A so-called “unnecessary and imminent” load device is selected, and a natural energy power generation device (solar power generation and wind power generation in the illustrated example) is selected for the target devices in the subsequent row numbers 8 and 9. Yes.

  Further, in the PdcnPals total value reduction list, the DC / DC conversion device 3 for the power storage device is selected as the target device with the row number = 1, and the target devices with the row numbers = 2 and 3 are other than the natural energy power generation device. A power generation device (in the illustrated example, gas power generation and diesel power generation) is selected, and a normal load device that is not unnecessary and urgent is selected for the target devices of subsequent row numbers 4 to 9.

  Therefore, when the reduction of the PdcpPals total value is executed in the order of arrow A1 → arrow A2 in FIG. 42 according to the row numbers of both lists, the following priorities a1) to a6) for each target device in the system: The process will be executed.

a1) Increase the load power of a normal load device (PdcnPals total value reduction list line number = 9 to 4) whose use has been restricted for the current control.
a2) Reduce the generated power of a power generation device other than the natural energy power generation device (PdcnPals total value reduction list line number = 3 to 2).
a3) The discharge power of the power storage device (PdcnPals total value reduction list row number = 1) is reduced.

a4) Increase the charging power of the power storage device (PdcpPals total value reduction list row number = 1).
a5) Increase the load power of the unnecessary load device (PdcpPals total value reduction list line numbers = 2 to 7).
a6) Reduce the generated power of the natural energy power generation device (PdcpPals total line number reduction list row numbers = 8 to 9).

  Thus, also in the second embodiment, the priority order (a2) for reducing the generated power of the power generation apparatus other than the natural energy power generation apparatus is higher than the priority order (a6) for reducing the generated power of the natural energy power generation apparatus. When the generated power is reduced to reduce the PdcpPals total value (excess power in the DC distribution line 1), the generated power not using natural energy is preferentially reduced. Therefore, it is a preferred priority from the viewpoint of environmental protection.

  In addition, since the priority (a1) for increasing the load power of a normal load device that is not unnecessary and urgent is higher than the priority (a5) for increasing the unnecessary and urgent load power, the load power is increased and the PdcpPals total value (DC When the excess power in the distribution line 1 is reduced, the load power of a normal load device that is not unnecessary and urgent is preferentially increased. Therefore, it is a priority that can improve user convenience.

  Furthermore, in the second embodiment, the priority order (a3) for reducing the discharge power of the power storage device and the priority order (a4) for increasing the charging power are higher than the priority order (a6) for reducing the generated power of the natural energy power generation device. When the PdcpPals total value (excessive power in the DC distribution line 1) is reduced, the power adjustment for the power storage device is preferentially performed over the process of reducing the generated power of the natural energy power generation device. Therefore, it is a preferred priority from the viewpoint of environmental protection.

  In the second embodiment, the priority order (a3) for reducing the discharge power of the power storage device and the priority order (a4) for increasing the charging power are lower than the priority order (a1) for increasing the load power of the normal load device. When the PdcpPals total value (excessive power in the DC distribution line 1) is reduced, the process of increasing the load power of a normal load device is performed with priority over the power adjustment for the power storage device. Therefore, it is a priority that can improve user convenience.

[Execution example of reduction of PdcnPals total value]
FIG. 43 is an explanatory diagram illustrating an execution example of reducing the PdcnPals total value in the second embodiment.
As described above, in the subroutine RDn (FIG. 26) of the PdcnPals total value reduction process, when it is necessary to mitigate insufficient power in the DC distribution line 1 (Yes in step ST21), the management device 12 uses the PdcpPals After the operation cancellation of the current line of the total value reduction list (subroutine CLp: FIG. 28) is executed (provided that the current line of the list is> 0), the operation of the current line of the PdcnPals total value reduction list is performed (subroutine DLn). : FIG. 29) is executed.

In other words, using the explanatory diagram of FIG. 43, the management device 12 first starts from the current row (row number = 9 in the example) of the PdcpPals total value reduction list in order from the current value, as indicated by an arrow A3. Release the operation from the emergency limit value to the normal value in descending order.
Thereafter, the management device 12 performs the operation from the normal value to the emergency limit value in ascending order in order from the first line (line number = 1) of the PdcnPals total value reduction list, as indicated by an arrow A4. .

  Therefore, if the reduction of the PdcnPals total value is executed in the order of arrow A3 → arrow A4 in FIG. 43 according to the row numbers of both lists, the following priorities b1) to b6) are applied to each target device in the system. Processing will be executed.

b1) Increasing the generated power of the natural energy power generation device (PdcpPals total value reduction list line numbers = 9 to 8) that has limited power generation for the current control.
b2) The load power of the unnecessary load device (PdcpPals total value reduction list line number = 7 to 2) is reduced.
b3) The charging power of the power storage device (PdcpPals total value reduction list row number = 1) is reduced.

b4) Increase the discharge power of the power storage device (PdcnPals total value reduction list row number = 1).
b5) Increase the generated power of the power generation devices other than the natural energy power generation devices (PdcnPals total value reduction list line numbers = 2 to 3).
b6) The load power of normal load devices other than b2) (from PdcnPals total value reduction list line numbers = 4 to 9) is reduced.

  Thus, also in the second embodiment, the priority (b1) for increasing the generated power of the natural energy power generation device is higher than the priority (b5) for increasing the generated power of the power generation devices other than the natural energy power generation device. When the generated power is increased to reduce the PdcnPals total value (insufficient power in the DC distribution line 1), the generated power using natural energy is preferentially increased. Therefore, it is a preferred priority from the viewpoint of environmental protection.

  In addition, since the priority (b2) for reducing the load power of the unnecessary and urgent load device is higher than the priority (b6) for increasing the normal load power that is not unnecessary and urgent, the load power is reduced and the PdcnPals total value ( When the power shortage in the DC distribution line 1 is reduced, the load power of the unnecessary load device is preferentially reduced. Therefore, the priority order is such that the load power can be reduced without significantly affecting the convenience of the user.

  Furthermore, in the second embodiment, the priority (b3) for reducing the charging power of the power storage device and the priority (b4) for increasing the discharging power are lower than the priority (b1) for increasing the generated power of the natural energy power generation device. In the case of reducing the PdcnPals total value (insufficient power in the DC distribution line 1), the process of increasing the generated power of the natural energy power generation apparatus is preferentially performed over the power adjustment for the power storage apparatus. Therefore, it is a preferred priority from the viewpoint of environmental protection.

  In the second embodiment, the priority (b3) for reducing the charging power of the power storage device and the priority (b4) for increasing the discharging power are higher than the priority (b6) for reducing the load power of the normal load device. When reducing the PdcnPals total value (insufficient power in the DC distribution line 1), the power adjustment for the power storage device is performed preferentially over the process of reducing the load power of the normal load device. Therefore, it is a priority that can improve user convenience.

[Effect of power supply and demand control]
As described above, also in the DC power distribution system of the second embodiment, the system management device 12 performs the first supply and demand control (see FIG. 21), so the DC power distribution line 1 is caused by excess power or insufficient power with respect to the DC power distribution line 1. Even if the voltage Vdc deviates from the standard value, either the PdcpPals total value or the PdcnPals total value is reduced, and the voltage of the DC distribution line 1 is returned to within the predetermined range of the standard value.
Therefore, the failure of the second Vdc control by the DC / AC converter 13 for AC power system can be stopped in a short time, and the voltage Vdc of the DC distribution line 1 can be maintained within a predetermined range.

Also in the DC power distribution system of the second embodiment, the system management device 12 performs the second supply and demand control (see FIG. 22) even when the second Vdc control is successful. The power supply and demand state of Po maximum possible value> Pdcp total value and Pi maximum possible value> Pdcn total value is maintained with a margin of two threshold values Th1 and Th2.
For this reason, the excess power Pdcp or the insufficient power Pdcn in the DC power distribution line 1 can be reliably covered with the reverse power flow power to the AC power system 14 or the forward power power from the AC power system 14. Vdc can be more reliably stabilized.

Also in the second embodiment, when there is no AC load device 16 under the system, or when the load power of the AC load device 16 is not a reduction target, the Pdcnp total is taken into the PdcnpPals total value considering the Pals total value. What is necessary is just to perform supply-and-demand control which reduces Pdcp total value and Pdcn total value, without performing processing, such as replacing a value.
Specifically, the supply and demand control that does not reduce the load power Pals of the AC load device 16 under the system is specifically the processing content in which the term “Pals” is omitted from the flowcharts included in FIGS. Can be realized.

  In each of the above-described embodiments, the DC distribution line 1, some or all of the conversion devices 2 to 5, 13 and the system management device 12 (in addition, the power storage device 7 may optionally be included). You may decide to set it as the apparatus accommodated in one housing.

1 DC distribution line 2 DC / DC converter for power generator (converter for power generator)
3 DC / DC converter for power storage device (converter for power storage device)
4 DC / DC converter for DC load device (converter for DC load device)
5 DC / AC converter for AC load device (converter for AC load device)
6 Power generation device 7 Power storage device 8 DC load device branch device 9 Branch device for AC load device under non-system 10 DC load device 11 AC load device 12 under system non-system 12 System management device
13 DC / AC converter for AC power system (AC power system converter)
14 AC power system 15 Branch device for AC load device under the system 16 AC load device under the system

Claims (36)

A converter for a power generator that converts the power from the power generator into a DC distribution line by converting the voltage;
The power from the AC power system is voltage-converted and supplied to the DC power distribution line, or the power from the DC power distribution line is voltage-converted and supplied to the AC power system.
A conversion device for a load device that converts the power from the DC distribution line into a load device by converting the voltage, and
The DC power distribution system, wherein the power generator conversion device and the AC power system conversion device perform first and second power control defined below independently of each other.
First power control: Power control performed by the converter for power generator so that the power supplied to the DC distribution line becomes a target value corresponding to a set voltage higher than the standard value of the voltage of the DC distribution line. Control: Power control performed by the AC power system converter so that the power supplied to the DC distribution line or the power supplied from the DC distribution line becomes a target value corresponding to the standard value of the voltage of the DC distribution line.   When the power target value corresponding to the high set voltage exceeds the maximum power that can be generated by the power generation device, the power generator conversion device uses the maximum power as the target value for the first power control. The DC power distribution system according to claim 1.   If the power target value corresponding to the standard value exceeds the Po maximum possible value that is the maximum power that can be output from the DC distribution line to the own device, the AC power system conversion device has a Po maximum possible value. The DC power distribution system according to claim 1 or 2, wherein is a target value for the second power control. In the case of further comprising an AC load device under the system that is directly powered from the AC power system without going through the DC distribution line,
4. The DC power distribution system according to claim 3, wherein the AC power system conversion device adds the following Psb maximum possible value and the following Pals subtotal value to calculate the Po maximum possible value for the own device.
Psb maximum possible value: the maximum reverse power flow that the AC power system can reverse power flow Pals subtotal value: the total load power of the AC load devices under the grid for its own device   When the power target value corresponding to the standard value exceeds the Pi maximum possible value that is the maximum power that can be input from the own device to the DC distribution line, the AC power system conversion device has the Pi maximum possible value. The DC power distribution system according to any one of claims 1 to 4, wherein is a target value for the second power control. In the case of further comprising an AC load device under the system that is directly powered from the AC power system without going through the DC distribution line,
6. The DC power distribution system according to claim 5, wherein the AC power system conversion device calculates the Pi maximum possible value for its own device by subtracting the following Pals subtotal value from the following Psf maximum possible value.
Psf maximum possible value: maximum forward power that the AC power system can flow forward Pals subtotal value: total load power of the AC load devices under the grid for the own device   The AC power system conversion device according to any one of claims 1 to 6, wherein the voltage value and the power value, which are the objects of control of the second power control, use an average value of those values for each AC cycle. The described DC power distribution system.   The total value of the capacitance of the capacitor on the DC distribution line side is determined so that the maximum ripple that can occur in the voltage of the DC distribution line falls within an allowable range obtained by multiplying the standard value by a predetermined ratio. The DC power distribution system according to claim 7.   The DC distribution system according to claim 8, wherein a total value of the capacitance of the capacitor on the DC distribution line side is determined by adjusting the capacitance of the capacitor for the AC power system conversion device. It further includes a system management device that can control power supply and demand in the system.
The system management device includes:
When the voltage of the DC distribution line falls outside the predetermined range from the standard value, the first supply and demand control is performed to reduce the following Pdcp total value or Pdcn total value so that the voltage falls within the predetermined range. Item 10. The DC power distribution system according to any one of Items 1 to 9.
Pdcp aggregate value: excess power in DC distribution line Pdcn aggregate value: insufficient power in DC distribution line It further includes a system management device that can control power supply and demand in the system.
The system management device includes:
Reduce the Pdcp total value so that the following Po maximum possible value is equal to or greater than the following Pdcp total value,
The DC power distribution system according to any one of claims 1 to 9, wherein first supply and demand control is performed to reduce the Pdcn total value so that the following Pi maximum possible value is equal to or greater than the following Pdcn total value.
Pdcp total value: excess power in DC distribution line Pdcn total value: insufficient power in DC distribution line Po maximum possible value: maximum power that can be output from DC distribution line to converter for AC power system Pi maximum possible value: for AC power system Maximum power that can be input from converter to DC distribution line It further includes a system management device that can control power supply and demand in the system.
The system management device includes:
The Pdcp total value is reduced so that a difference obtained by subtracting the following Pdcp total value from the following Po maximum possible value is equal to or more than the first threshold value,
The second supply / demand control for reducing the Pdcn total value so that a difference obtained by subtracting the following Pdcn total value from the following Pi maximum possible value is equal to or greater than a second threshold value. The described DC power distribution system.
Pdcp total value: excess power in DC distribution line Pdcn total value: insufficient power in DC distribution line Po maximum possible value: maximum power that can be output from DC distribution line to converter for AC power system Pi maximum possible value: for AC power system Maximum power that can be input from converter to DC distribution line A converter for a power generator that converts the power from the power generator into a DC distribution line by converting the voltage;
The power from the AC power system is voltage-converted and supplied to the DC power distribution line, or the power from the DC power distribution line is voltage-converted and supplied to the AC power system.
A conversion device for a load device that converts the power from the DC distribution line into a load device after voltage conversion;
A system management device capable of controlling power supply and demand in the system,
The system management device includes:
When the voltage of the DC distribution line falls outside the predetermined range from the standard value, the first supply and demand control for reducing the following Pdcp total value or Pdcn total value is performed so that the voltage falls within the predetermined range. DC distribution system characterized by
Pdcp aggregate value: excess power in DC distribution line Pdcn aggregate value: insufficient power in DC distribution line A converter for a power generator that converts the power from the power generator into a DC distribution line by converting the voltage;
The power from the AC power system is voltage-converted and supplied to the DC power distribution line, or the power from the DC power distribution line is voltage-converted and supplied to the AC power system.
A conversion device for a load device that converts the power from the DC distribution line into a load device after voltage conversion;
A system management device capable of controlling power supply and demand in the system,
The system management device includes:
Reduce the Pdcp total value so that the following Po maximum possible value is equal to or greater than the following Pdcp total value,
A DC power distribution system that performs first supply and demand control for reducing the Pdcn total value so that the following maximum Pi possible value is equal to or greater than the following Pdcn total value.
Pdcp total value: excess power in DC distribution line Pdcn total value: insufficient power in DC distribution line Po maximum possible value: maximum power that can be output from DC distribution line to converter for AC power system Pi maximum possible value: for AC power system Maximum power that can be input from converter to DC distribution line A converter for a power generator that converts the power from the power generator into a DC distribution line by converting the voltage;
The power from the AC power system is voltage-converted and supplied to the DC power distribution line, or the power from the DC power distribution line is voltage-converted and supplied to the AC power system.
A conversion device for a load device that converts the power from the DC distribution line into a load device after voltage conversion;
A system management device capable of controlling power supply and demand in the system,
The system management device includes:
The Pdcp total value is reduced so that a difference obtained by subtracting the following Pdcp total value from the following Po maximum possible value is equal to or more than the first threshold value,
A DC power distribution system that performs second supply and demand control for reducing the Pdcn total value so that a difference obtained by subtracting the following Pdcn total value from the following Pi maximum possible value is equal to or greater than a second threshold value.
Pdcp total value: excess power in DC distribution line Pdcn total value: insufficient power in DC distribution line Po maximum possible value: maximum power that can be output from DC distribution line to converter for AC power system Pi maximum possible value: for AC power system Maximum power that can be input from converter to DC distribution line The system management device includes:
The second supply / demand control according to claim 12 or 15 can be executed, and the second supply / demand control is performed after the first supply / demand control. DC power distribution system.   The DC distribution according to any one of claims 10 to 16, wherein the reduction of the Pdcp total value is to increase load power in the system or reduce generated power in accordance with a predetermined priority order for Pdcp reduction. system.   The DC distribution according to any one of claims 10 to 17, wherein the reduction of the total Pdcn value is to reduce load power in the system or increase generated power in accordance with a predetermined priority order for reducing Pdcn. system. The system management device includes:
A Pdcp total value reduction list in which devices and operations for increasing load power and devices and operations for reducing generated power are arranged in a predetermined priority order;
A Pdcn total value reduction list in which devices and operations for reducing load power and devices and operations for increasing generated power are arranged in a predetermined priority order;
The DC distribution system according to any one of claims 10 to 18, wherein the Pdcp total value or the Pdcn total value is reduced by performing the operation described in the list according to the priority order.   A power storage device conversion device that further converts the voltage of power from the power storage device and supplies the power to the DC power distribution line, or converts the power from the DC power distribution wire to the power storage device after voltage conversion. Item 10. The DC power distribution system according to any one of Items 1 to 9.   A power storage device conversion device that further converts the voltage of power from the power storage device and supplies the power to the DC power distribution line, or converts the power from the DC power distribution wire to the power storage device after voltage conversion. Item 20. The DC power distribution system according to any one of Items 10 to 19.   The reduction in the Pdcp total value includes increasing charging power to the power storage device or decreasing discharge power from the power storage device according to a predetermined priority order for reducing Pdcp. DC power distribution system.   23. The reduction in the Pdcn total value includes reducing charging power to the power storage device or increasing discharge power from the power storage device according to a predetermined priority order for reducing Pdcn. The described DC power distribution system. The system management device includes:
A Pdcp total value reduction list in which equipment and operation for increasing load power, equipment and operation for reducing generated power, and equipment and operation for increasing charging power to the power storage device are arranged in a predetermined priority order;
A device and operation for reducing load power, a device and operation for increasing generated power, and a device and operation for increasing the discharge power to the power storage device, arranged in a predetermined priority order, and a Pdcn total value reduction list,
The DC power distribution system according to any one of claims 21 to 23, wherein the Pdcp total value or the Pdcn total value is reduced by performing the operation described in the list according to the priority order. The system management device includes:
Before performing the operation according to the Pdcp total value reduction list, cancel the operation according to the Pdcn total value reduction list that has already been performed,
The DC power distribution system according to claim 19 or 24, wherein the operation according to the Pdcp total value reduction list that has already been performed is canceled before the operation is performed according to the Pdcn total value reduction list. In the case of reduction of the Pdcp total value,
Of the power generation device using natural energy and the other power generation devices, the priority order of reducing the latter generated power is set higher than the priority order of reducing the former power generation power,
18. The priority of increasing the latter load power is set higher than the priority of increasing the former load power among the unnecessary load devices and the other load devices. The DC power distribution system according to any one of 18, 19, 21, 22, 23, 24 and 25. In the case of reduction of the Pdcn total value,
Among the power generation devices that use natural energy and the other power generation devices, the priority order of increasing the former generated power is set higher than the priority order of increasing the latter generated power,
The priority order for reducing the load power of the former is set higher than the priority order for reducing the load power of the latter among the unnecessary load device and the other load devices. 27. The DC power distribution system according to any one of 19, 21, 22, 23, 24, 25, or 26. In the case of reduction of the Pdcp total value,
The priority for reducing discharge power from the power storage device and the priority for increasing charging power to the power storage device are higher or unnecessary than the priority for reducing the power generation of the power generation device using natural energy. 28. The DC power distribution system according to claim 22, 23, 24, 25, 26 or 27, which is set lower than the priority order for increasing load power of the load device other than the emergency load device. In the case of reduction of the Pdcn total value,
The priority for reducing the charging power to the power storage device and the priority for increasing the discharge power from the power storage device are lower or unnecessary than the priority for increasing the generated power of the power generation device using natural energy. 29. The DC power distribution system according to claim 23, 24, 25, 26, 27 or 28, which is set higher than the priority order for reducing load power of the load device other than the emergency load device. In the case of further comprising an AC load device under the system that is directly powered from the AC power system without going through the DC distribution line,
The said system management apparatus adds the following Psb maximum possible value and the following Pals subtotal value, and calculates the said Po maximum possible value about the said converter for alternating current power systems. DC power distribution system described in 1.
Psb maximum possible value: maximum reverse power flow that the AC power system can reverse power flow Pals subtotal value: total value of the load power of the AC load device under the system for the converter for the AC power system In the case of further comprising an AC load device under the system that is directly powered from the AC power system without going through the DC distribution line,
The said system management apparatus subtracts the following Pals subtotal value from the following Psf maximum possible value, and calculates the said Pi maximum possible value about the said converter for alternating current power systems. DC power distribution system described in 1.
Psf maximum possible value: maximum forward power that the AC power system can flow forward Pals subtotal value: total value of load power of AC load devices under the system for the converter for AC power system The system management device uses the following PdcpPals total value and PdcnPals total value instead of the Pdcp total value and Pdcn total value,
Instead of the Po maximum possible value and Pi maximum possible value of the converter for AC power system, the following PoPals maximum possible value and PiPals maximum possible value of the converter for AC power system are used, and the first or second 32. The DC power distribution system according to claim 31, wherein supply and demand control is performed.
PdcpPals total value: Pdcp total value-Pals total value PdcnPals total value: Pdcn total value + Pals total value PoPals maximum possible value: Po maximum possible value-Pals subtotal value (≈Psb maximum possible value)
PiPals maximum possible value: Pi maximum possible value + Pals subtotal value (≈Psf maximum possible value)
Total value of Pals: Total load power of AC load devices under all systems A system management device that performs power supply and demand control in a DC power distribution system, capable of dealing with excess or shortage of power in a DC power distribution line by reverse power flow or forward power flow in an AC power system,
When the voltage of the DC distribution line falls outside the predetermined range from the standard value, the first supply and demand control for reducing the following Pdcp total value or Pdcn total value is performed so that the voltage falls within the predetermined range. A system management apparatus characterized by the above.
Pdcp aggregate value: excess power in DC distribution line Pdcn aggregate value: insufficient power in DC distribution line A system management device that performs power supply and demand control in a DC power distribution system, capable of dealing with excess or shortage of power in a DC power distribution line by reverse power flow or forward power flow in an AC power system,
Reduce the Pdcp total value so that the following Po maximum possible value is equal to or greater than the following Pdcp total value,
A system management apparatus that performs first supply and demand control for reducing the Pdcn total value so that the following maximum Pi possible value is equal to or greater than the following Pdcn total value.
Pdcp total value: excess power in DC distribution line Pdcn total value: insufficient power in DC distribution line Po maximum possible value: maximum power that can be output from DC distribution line to converter for AC power system Pi maximum possible value: for AC power system Maximum power that can be input from converter to DC distribution line A system management device that performs power supply and demand control in a DC power distribution system, capable of dealing with excess or shortage of power in a DC power distribution line by reverse power flow or forward power flow in an AC power system,
The Pdcp total value is reduced so that the difference obtained by subtracting the following Pdcp total value from the following Po maximum possible value is equal to or greater than the first threshold,
A system management apparatus that performs second supply and demand control for reducing the Pdcn total value so that a difference obtained by subtracting the following Pdcn total value from the following Pi maximum possible value is equal to or greater than a second threshold value.
Pdcp total value: excess power in DC distribution line Pdcn total value: insufficient power in DC distribution line Po maximum possible value: maximum power that can be output from DC distribution line to converter for AC power system Pi maximum possible value: for AC power system Maximum power that can be input from converter to DC distribution line A computer program for causing a computer to function as an apparatus for controlling power supply and demand in a DC power distribution system, capable of dealing with excess or shortage of power in a DC power distribution line by reverse power flow or forward power flow in an AC power system,
Determining whether the voltage of the DC distribution line is out of a predetermined range from a standard value;
When the determination result is affirmative, reducing the following Pdcp total value or Pdcn total value so that the voltage of the DC distribution line falls within a predetermined range;
A computer program comprising:
Pdcp aggregate value: excess power in DC distribution line Pdcn aggregate value: insufficient power in DC distribution line

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