JP6109380B2 - Distributed power system - Google Patents

Description

  The present invention relates to a power line connected to a power system, a charge / discharge device having a power storage unit connected to the power line at a first connection location, and a power generation device connected to the power line at a second connection location. And a first power consuming device connected to the power line at a third connection location.

  Patent Document 1 describes a distributed power supply system including a power line connected to an electric power system, and a power generation device, a charge / discharge device, and a power consumption device connected to the power line. In this distributed power system, the power system is connected to the most upstream side of the power line and the power line is connected to the most downstream side of the power line. A consumer device is connected. And the charging / discharging apparatus and the electric power generating apparatus are connected in order from the upstream of the power line toward the downstream. Further, the operation of the power generator is controlled under the condition that the power flow is not directed from the power generator to the upstream side (that is, the power system side) (so-called reverse power flow is prohibited).

FIG. 5A shows a distributed power supply system having a configuration similar to that of Patent Document 1 shown as a comparative example. The distributed power supply system shown in FIG. 5A includes a power line 2 connected to the power system 1, a charge / discharge device 10 connected to the power line 2 at a first connection location P 1, and a power line 2 connected to the power line 2. A power generation device 11 connected at two connection points P2 and a first power consuming device 12 connected at a third connection point P3 with respect to the power line 2, and downstream from the connection point of the power system 1 with respect to the power line 2 The 1st connection location P1, the 3rd connection location P3, and the 2nd connection location P2 are provided in the arrangement order toward the side. Furthermore, the second power consuming device 13 is connected to the power line 2 at the fourth connection point P4 closer to the power system 1 than the first connection point P1. Then, the power generation apparatus 11, with reference to the detection result of the current transformer CT2 (i.e., the first connection point P1 on the power line 2, between the third connection point P3 on the upstream side of the second connection point P2 Supply the maximum generated power to the power line 2 under the condition that the power flow is not directed to the power system 1 side than the third connection point P3 ) (see the power that can be derived based on the flowing current value) In addition, the charging / discharging device 10 refers to the detection result of the current transformer CT1 (that is, refers to the power that can be derived based on the current value on the power system 1 side from the fourth connection point P4). The maximum discharge power is supplied to the power line 2 under the condition that the power flow is not directed toward the power system 1 from the four connection points P4.

By configuring as shown in FIG. 5A, if the power system 1 is in a non-power failure state, the first power consuming device 12 is at least one of the power system 1, the charge / discharge device 10, and the power generation device 11. The power can be supplied from one, and the second power consuming device 13 can be supplied from at least one of the power system 1 and the charge / discharge device 10. Further, even when the power system 1 is in a power failure state and the circuit breaker 3 is opened, the first power consuming device 12 is supplied from at least one of the charge / discharge device 10 and the power generation device 11. Can supply power.
Therefore, an important electrical device that needs to stably supply power even during a power failure may be connected to the position of the first power consuming device 12 shown in FIG.

JP 2011-188607 A

The distributed power supply system having the configuration described in FIG. 5A can achieve the purpose of supplying stable power to, for example, the first power consuming device 12, but the power generating device 11 is connected to the power system more than the third connection point P3. Since power cannot be supplied to the 1 side, the generated power of the power generation device 11 cannot be charged into the charge / discharge device 10 or supplied to the second power consumption device 13. Therefore, there is a problem in that the operating rate (the size of the power generation output, the length of the power generation time, etc.) of the power generation device 11 is lowered. As a result, the merit (energy saving property, environmental property, economical efficiency) by operation of the power generation device 11 is limited. In addition, the merit of introducing a power generator that is desired to be operated in such an emergency is limited.

When it aims at making the operation rate of the electric power generating apparatus 11 high, the system structure of the comparative example shown in FIG.5 (b) can be assumed. In the distributed power supply system of FIG. 5B, in the distributed power supply system shown in FIG. 5A, for example, the second power consuming device 13 that is relatively less important and has not been supplied with power during a power failure. In addition, since the electric power is always supplied from the power generation device 11, the operating rate of the power generation device 11 is increased.
However, when the power system 1 is in a power failure state, the power supply from the power system 1 cannot be received. As a result, at least one of the charge / discharge device 10 and the power generation device 11 is connected to the first power consumption device 12 and Since all the power consumption of the second power consuming device 13 has to be supplied, the power generation device 11 and the charge / discharge device 10 are overloaded, and for example, the power generation device 11 can not normally perform a power generation operation.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a distributed power supply system capable of avoiding overloading of the power generation device and the charge / discharge device while increasing the operating rate of the power generation device. It is in.

The characteristic configuration of the distributed power supply system according to the present invention for achieving the above object includes: a power line connected to a power system; and a charge / discharge device having a power storage unit connected to the power line at a first connection location; A distributed power supply system comprising: a power generation device connected to the power line at a second connection location; and a first power consumption device connected to the power line at a third connection location,
A second power consuming device connected to the power line at a fourth connection point;
Wherein said first connection point toward the downstream side as viewed from the connection point of the power system and the third connecting portion and the second connecting portion is provided at its sorted with respect to the power line, the fourth connecting portion has the Provided on the power system side from the third connection location ,
The power generation device controls the generated power under a condition that when the power system is in a power failure state, the power flow in the power line is not directed toward the power system side than the third connection point , the power system When the power is in a non-power failure state, the generated power is controlled under the condition that the power flow in the power line is not directed to the power system side rather than the predetermined part on the power system side than the fourth connection place. Configured,
When the power system is in a power failure state, the charge / discharge device, the power generation device, and the first power consumption device are electrically connected to each other via the power line, and the second power consumption device is Electrically disconnected from the discharge device, the power generation device and the first power consuming device;
When the power system is in a non-power failure state, the charge / discharge device, the power generation device, the first power consumption device, and the second power consumption device are electrically connected to each other via the power line. .

According to the above characteristic configuration, the power generation device controls the generated power under the condition that the power flow in the power line is not directed from the third connection location to the power system side when the power system is in a power failure state. That is, the power is supplied to the first power consuming device that is connected to the power line in the range including the third connection point and the downstream side thereof, that is, in the range including the third connection point and further away from the power system. Can be used to continuously supply power.
In addition, when the power system is in an uninterruptible state, the power generator generates power under the condition that the power flow on the power line is not directed to the power system side from the predetermined location on the power system side rather than the fourth connection location. To control. That is, the first power consuming device and the first power consuming device connected to the power line in the range including the fourth connection location and the downstream side thereof, that is, the range including the fourth connection location and further away from the power system. In order to supply power to the two power consuming devices, the power generator can be used effectively.

Furthermore, when the power system is in a non-power failure state, the charging / discharging device, the power generation device, the first power consumption device, and the second power consumption device are electrically connected to each other via the power line. Power can be supplied from at least one of the power system, the charge / discharge device, and the power generation device, and the second power consumption device can be supplied with at least one of the power system, the charge / discharge device, and the power generation device. Power can be supplied from one.
In addition, when the power system is in a power failure state, the charging / discharging device, the power generation device, and the first power consuming device are electrically connected to each other via the power line. The power can be supplied from at least one of the power generation device. That is, since it is only necessary to share the power consumption of the first power consuming device between the charging / discharging device and the power generation device, it is possible to avoid overloading the charging / discharging device and the power generation device.

In addition, even if it is necessary to supply power from the power generator to the second power consuming device when the power system is in a non-power failure state, when the power system is in a power failure state, the second power consuming device is It is electrically disconnected from the power generation device, and power supply from the power generation device to the second power consuming device becomes unnecessary. As a result, when the power system is in a power failure state, the load on the charging / discharging device and the power generation device can be reduced, and power can be supplied from the charging / discharging device to the first power consuming device for a relatively long time. . Therefore, even if a mechanism for preventing the single operation of the power generation device is provided, the operation of the power generation device is not immediately stopped when the power system is in a power failure state, but the charge / discharge device is connected from the power system to the power line. As long as the power supply is continued and power supply to the power line is continued, the power generator can continue to operate.
Therefore, it is possible to provide a distributed power supply system that can avoid overloading of the power generation device and the charge / discharge device while increasing the operating rate of the power generation device.

  Another characteristic configuration of the distributed power supply system according to the present invention is that the charge / discharge device is connected to the power line at the fourth connection point where the second power consuming device is connected to the power line. It exists in the point which exists in the said electric power system side rather than the said 1st connection location.

  According to the above characteristic configuration, when the power system is in a non-power failure state, the generated power of the power generator can be supplied also to the charge / discharge device. As a result, the operating rate of the power generator can be increased.

Still another characteristic configuration of the distributed power supply system according to the present invention includes a system information detection device that detects system information capable of determining whether the power system is in a power outage state or a non-power outage state,
The power generator is in a point of determining whether the power system is in a power failure state or a non-power failure state based on the system information received from the system information detection device.

According to the above-described characteristic configuration, the power generator generates power from a predetermined location on the power system side from the third connection location based on whether the power system is in a power failure state or a non-power failure state. Generate power under the condition that the generated power is controlled under the condition that it is not directed to the grid side, or the power flow on the power line is not directed from the predetermined location on the power system side to the power system side rather than the fourth connection location. Whether to control power can be switched spontaneously.

Still another characteristic configuration of the distributed power supply system according to the present invention is a first configuration in which the power generation device represents a power flow from the predetermined location on the power system side toward the power system side with respect to the fourth connection location. A signal and a second signal representing a power flow from the third connection point toward the power system side are received, and the power system is determined to be in a power failure state based on the system information received from the system information detection device When the generated power is controlled with reference to the second signal, the generated power is controlled with reference to the first signal when it is determined that the power system is in a non-power failure state.

According to the above characteristic configuration, the power generation device refers to the second signal representing the power flow from the third connection point toward the power system, based on whether the power system is in a power failure state or a non-power failure state. Then, the generated power is controlled under the condition that the power flow in the power line is not directed from the predetermined location on the power system side to the power system side from the third connection location , or the power system side from the fourth connection location. The condition that the power flow in the power line is not directed from the predetermined location on the power system side to the power system side from the fourth connection location with reference to the first signal representing the power flow from the predetermined location to the power system side. It is possible to voluntarily switch whether to control the generated power.

Still another characteristic configuration of the distributed power supply system according to the present invention is a system information detection device that detects system information capable of determining whether the power system is in a power outage state or a non-power outage state,
A first signal line to which a first signal representing a power flow from the predetermined location on the power system side to the power system side than the fourth connection location is input, and from the third connection location to the power system. A switch to which a second signal line to which a second signal representing a power flow toward the side is input is connected; a first switching state in which the first signal line is connected to the power generator; and the second signal line A switching device having a switching control unit that switches the switch to any one of the second switching states connected to the power generation device;
The switching control unit switches the switch to the first switching state when the power system is in a non-power failure state based on the system information received from the system information detection device, and the power system is in a power failure state. The switching device is switched to the second switching state.

According to the above characteristic configuration, the switching device transmits the first signal or the second signal to the power generation device based on whether the power system is in a power failure state or a non-power failure state. Switch between. In other words, the power generator automatically connects the power flow on the power line to the third line when the power system is in a power outage state automatically without determining whether the power system is in a power outage state or in a non-power outage state. The generated power is controlled under the condition that it does not go from the predetermined location on the power system side to the power system side rather than the location, and when the power system is in an uninterruptible state, the power flow in the power line is more power than the fourth connection location. It operates to control the generated power under the condition that it does not go from the predetermined location on the grid side to the power grid side.

It is a figure explaining the structure of the distributed power supply system of 1st Embodiment. It is a figure explaining the structure of the distributed power supply system of 2nd Embodiment. It is a figure explaining the structure of the distributed power supply system of 3rd Embodiment. It is a figure explaining the structure of the distributed power supply system of 4th Embodiment. It is a figure explaining the structure of the distributed power supply system of a comparative example.

<First Embodiment>
The distributed power supply system according to the first embodiment will be described below with reference to the drawings.
FIG. 1 is a diagram illustrating the configuration of the distributed power supply system according to the first embodiment. As shown in FIG. 1, the distributed power supply system includes a power line 2 connected to the power system 1, a charging / discharging device 10 having a power storage unit 10 b connected to the power line 2 at a first connection location P 1, and a power line 2 is connected to the power line 2 at the second connection point P2 and the first power consuming device 12 is connected to the power line 2 at the third connection point P3. A first connection point P1, a third connection point P3, and a second connection point P2 are provided in the arrangement order toward the downstream side as viewed from the point. Furthermore, the second power consuming device 13 is connected to the power line 2 at the fourth connection point P4 closer to the power system 1 than the first connection point P1. In the present embodiment, the side closer to the power system 1 in the power line 2 is referred to as the upstream side, and the side away from the power system 1 in the power line 2 is referred to as the downstream side.

  In this embodiment, the circuit breaker 3 is provided in the power line 2 on the power system 1 side from the first connection point P1. Moreover, the system information detection apparatus 15 which detects the system information which can determine whether the electric power system 1 is in the power failure state or the non-power failure state is provided on the power system 1 side from the circuit breaker 3. For example, the system information detection device 15 is a device that detects the voltage of power on the power line 2 as system information. In this case, if the voltage of the power line 2 on the power system 1 side of the circuit breaker 3 is less than a predetermined voltage, it can be determined that the power system 1 is in a power failure state, and if the voltage is higher than the predetermined voltage, the power system 1 is in a non-power failure state. Can be determined. Here, the system information detection device 15 itself is configured to determine whether the power system 1 is in a power failure state or a non-power failure state based on the voltage of the power line 2 and to transmit the determination result to each device. May be.

  Specifically, when the voltage of the power line 2 transmitted from the system information detection device 15 is equal to or higher than a predetermined voltage, the power generation device 11 can determine that the power system 1 is in a non-power failure state. On the other hand, if the voltage of the power line 2 transmitted from the system information detection device 15 is less than the predetermined voltage, the power generation device 11 can determine that the power system 1 is in a power failure state.

  The circuit breaker 3 refers to the detection result of the system information detection device 15, and if the power system 1 is in a non-power failure state, the circuit breaker 3 is closed to electrically connect the power system 1 and the first connection location P1. Thus, the power supplied from the power system 1 is supplied to the downstream side of the first connection point P1. Moreover, the circuit breaker 3 refers to the detection result of the system information detection device 15, and if the power system 1 is in a power failure state, the circuit breaker 3 is opened to electrically disconnect the power system 1 and the first connection location P1. .

  The charging / discharging device 10 includes a power storage unit 10b capable of storing electricity, and a power conversion unit 10a capable of controlling discharge power from the power storage unit 10b to the power line 2 and charge power from the power line 2 to the power storage unit 10b. . The power storage unit 10b can be composed of various devices having a power storage function, such as a storage battery or an electric double layer capacitor. Moreover, the detection result of the system | strain information detection apparatus 15 is comprised so that it may be transmitted to the charging / discharging apparatus 10. FIG.

In the present embodiment, the first signal and the second signal, which are detection results of the current transformers CT1 and CT2, are current values in the power line 2. As a result, the power in the power line 2 can be derived from the detection results of the current transformers CT1 and CT2 and the voltage value of the power line 2 detected separately. Specifically, the power generation device 11 uses the first signal, which is the detection result of the current transformer CT1, and the voltage value of the power of the power line 2 so that the power is higher than a predetermined location on the power system 1 side from the fourth connection location P4. It is possible to know the power flow toward the grid 1 side, and from the second signal, which is the detection result of the current transformer CT2, and the voltage value of the power on the power line 2, from the third connection point P3 to the grid 1 side. You can know the power flow toward

  For example, the power conversion unit 10a of the charging / discharging device 10 charges the power storage unit 10b in the midnight time zone when the power purchase fee from the power system 1 is relatively low, and the power purchase fee from the power system 1 is relatively To the power storage unit 10b when the total power consumption of the first power consuming device 12 and the second power consuming device 13 is relatively small. It is possible to adopt an operation mode in which charging is performed and discharging from the power storage unit 10b is performed in a time zone in which the total power consumption is relatively large. Among these, the power conversion unit 10a of the charging / discharging device 10 is configured to charge the power storage unit 10b in a time zone in which the total power consumption of the first power consumption device 12 and the second power consumption device 13 is relatively small. Then, in order to charge the charging / discharging device 10, the power generation device 11 is operated, and as a result, the operating rate of the power generation device 11 can be increased. In addition, when the generated power of the power generator 11 cannot be charged to the charge / discharge device 10, the power supplied to the power system 1 from a thermal power plant or the like whose power generation efficiency (that is, energy efficiency) is not so high is supplied to the charge / discharge device 10. It must be charged, the power discharged and supplied to the power consuming devices 12, 13, etc. That is, the operating rate of the power generation device 11 is relatively low, and the charge / discharge device 10 is also apparently low in energy efficiency (that is, power generation efficiency (about 37%) × charging efficiency × discharge efficiency of a thermal power plant). Must drive. On the other hand, if the charge / discharge device 10 can be charged with the power generated by the power generation device 11, the operating rate of the power generation device 11 can be improved, and the power generation device 11 can generate, for example, thermoelectric power combined with heat and electricity. In the case of using a combined supply device, the energy efficiency is about 90% (power generation efficiency (about 35%) + exhaust heat efficiency (about 55%)), so the charging / discharging device 10 also appears to have high energy efficiency (cogeneration) Operation with the power generation efficiency of the device (about 35%) × charge efficiency × discharge efficiency + exhaust heat efficiency of the combined heat and power supply device (about 55%) can be performed.

Since the circuit breaker 3 is closed when the power system 1 is in an uninterrupted state, the charging / discharging device 10, the power generation device 11, the first power consumption device 12, and the second power consumption device 13 are mutually connected via the power line 2. Electrically connected. At this time, power is supplied from at least one of the power system 1, the charge / discharge device 10, and the power generation device 11 to the first power consumption device 12, and power is supplied to the second power consumption device 13. Power is supplied from at least one of the system 1 and the charge / discharge device 10.
Since the circuit breaker 3 is opened when the power system 1 is in a power failure state, the charging / discharging device 10, the power generation device 11, and the first power consumption device 12 are electrically connected to each other via the power line 2, and The second power consumption device 13 is electrically disconnected from the charge / discharge device 10, the power generation device 11, and the first power consumption device 12.

The first power consuming device 12 is an important electrical device that needs to supply power even when the power system 1 is in a power failure state. For example, a lighting device that needs to be lit in an emergency such as a power outage or an information device that needs to be always operated is connected to the third connection point P3 of the power line 2 as the first power consuming device 12. Yes. On the other hand, the second power consuming device 13 is an electrical device that is not supplied with power if the power system 1 is in a power failure state. For example, an electric device that is less important than the first power consuming device 12 such as an air conditioner that does not have to be supplied with power in an emergency such as a power outage or a lighting device that is not so important is the second power. The consumer device 13 is connected to the fourth connection point P4 of the power line 2.
In addition, it can be set suitably what kind of electric equipment is made into the 1st power consuming apparatus 12 and the 2nd power consuming apparatus 13. FIG.

The power generation device 11 can be configured using a device capable of controlling its own generated power, such as a fuel cell or a generator that operates by the driving force of the engine. And the electric power generating apparatus 11 controls generated electric power on the conditions that the electric power flow in the electric power line 2 is not made to go to the electric power system 1 side rather than the 3rd connection location P3, when the electric power system 1 is in a power failure state ( That is, the maximum generated power is supplied to the power line 2 under the conditions), and when the power system 1 is in a non-power-out state, the power flow in the power line 2 is set to a predetermined value closer to the power system 1 than the fourth connection point P4 It is configured to control the generated power under the condition that it is not directed toward the power system 1 rather than the location (that is, supply the maximum generated power to the power line 2 under the condition).

  Specifically, when the power system 1 is in a non-power failure state, the power generation apparatus 11 refers to the detection result (first signal) of the current transformer CT1 to change the power flow in the power line 2 to the fourth connection point P4. The generated power is controlled under the condition that the power system 1 does not go from the predetermined location on the power system 1 side to the power system 1 side.

On the other hand, when the power system 1 is in a power failure state, the power generation device 11 refers to the detection result (second signal) of the current transformer CT2 to change the power flow in the power line 2 from the third connection point P3. The generated power is controlled under the condition that it is not directed to the power system 1 side. That is, the power generation device 11 supplies the power line 2 with power corresponding to the power consumption of the first power consumption device 12 or power less than the power consumption.

As described above, when the power system 1 is in a power failure state , the power generator 11 is used to continuously supply power to the first power consuming device 12 connected to the power line 2 at the third connection point P3. it can. In addition, when the power system 1 is in a non-power failure state, the first power consuming device 12 and the second power consuming device that are connected to the power line 2 in the range downstream from the fourth connecting point P4. In order to supply power to 13, the power generation device 11 can be effectively used.

  Further, when the power system is in a power failure state, the charging / discharging device 10 and the power generation device 11 can serve as a power supply source for the first power consuming device 12, that is, the power consumption of the first power consuming device 12 is changed to the charging / discharging device 10 And since it can supply by sharing with the electric power generating apparatus 11, it can avoid that the charging / discharging apparatus 10 and the electric power generating apparatus 11 become overload. In addition, when the power system 1 is in a power failure state, the second power consuming device 13 is electrically disconnected from the power generating device 11, and power supply from the power generating device 11 to the second power consuming device 13 becomes unnecessary. . As a result, when the power system 1 is in a power failure state, the load on the charging / discharging device 10 and the power generation device 11 can be reduced, and is relatively long from the charging / discharging device 10 to the first power consuming device 12. Time power can be supplied. Therefore, even if a mechanism for preventing the power generator 11 from being operated alone is provided, the operation of the power generator 11 is not immediately stopped when the power system 1 is in a power failure state. As long as power supply from the system 1 to the power line 2 is simulated and power supply to the power line 2 is continued, the power generation apparatus 11 can also continue to operate.

Second Embodiment
The distributed power supply system of the second embodiment is different from the distributed power supply system of the first embodiment in that a switching device 14 is provided. Although the distributed power supply system of 2nd Embodiment is demonstrated below, description is abbreviate | omitted about the structure similar to 1st Embodiment.

FIG. 2 is a diagram illustrating the configuration of the distributed power supply system according to the second embodiment. As shown in the figure, the distributed power supply system of the second embodiment includes a switching device 14. The switching device 14 includes a first signal line 4 to which a first signal representing a power flow from a predetermined location closer to the power system 1 than the fourth connection location P4 to the power system 1 side is input, and a third signal line 4 The switch 14a to which the second signal line 5 to which the second signal representing the power flow from the connection point P3 toward the power system 1 is input is connected, and the first signal line 4 is connected to the power generator 11. It has the switching control part 14b which switches the switch 14a to either a 1st switching state and the 2nd switching state which connects the 2nd signal wire | line 5 to the electric power generating apparatus 11. FIG. And the switching control part 14b receives the system | strain information which shows whether the electric power grid | system 1 is a non-power-out state or a power-out state from the system | strain information detection apparatus 15, and when the power system 1 is in a non-power-out state. The switching device 14a is switched to the first switching state, and when the power system 1 is in the power failure state, the switching device 14a is switched to the second switching state.

That is, when the power system 1 is in a power failure state, the switching control unit 14b switches to the second switching state in which the second signal line 5 is connected to the power generation device 11 based on the system information transmitted from the system information detecting device 15. 14a is switched. As a result, the detection result of the current transformer CT2 is transmitted to the power generation device 11, and the power generation device 11 generates generated power under the condition that the power flow is not directed to the power system 1 side from the third connection point P3. Control.
In contrast, when the power system 1 is in a non- power failure state, the switching control unit 14b connects the first signal line 4 to the power generation device 11 based on the system information transmitted from the system information detection device 15. The switch 14a is switched to the switching state. As a result, the detection result of the current transformer CT1 is transmitted to the power generation device 11, and the power generation device 11 transmits power flow to the power system 1 side from a predetermined location on the power system 1 side than the fourth connection location P4. The generated power is controlled under the condition that it is not directed.

By providing such a switching device 14, the power generation device 11 automatically has the power system 1 in the power outage state without determining whether the power system 1 is in the power outage state or the non-power outage state. In some cases, the generated power is controlled under the condition that the power flow in the power line 2 is not directed from the predetermined location on the power system 1 side to the power system 1 side relative to the third connection location P3. Operates to control the generated power under the condition that the power flow in the power line 2 is not directed from the predetermined location on the power system 1 side to the power system 1 side than the fourth connection location P4 when in a power failure state. To do.

<Third Embodiment>
The distributed power supply system of the third embodiment is different from the above embodiment in the connection location of the second power consuming device 13 with respect to the power line 2. The configuration of the distributed power supply system according to the third embodiment will be described below, but the description of the same configuration as the above embodiment will be omitted.

FIG. 3 is a diagram illustrating the configuration of the distributed power supply system according to the third embodiment. As shown in the figure, the fourth connection point P4 where the second power consuming device 13 is connected to the power line 2 is the third connection point P3 where the first power consuming device 12 is connected to the power line 2, and the power generator 11 is the power line 2. And the downstream side of the first connection point P1 where the charging / discharging device 10 is connected to the power line 2 (that is, the side away from the power system 1). ).

  Further, the second power consuming device 13 is connected to the fourth connection point P4 of the power line 2 via the circuit breaker 6. Then, like the circuit breaker 3, the circuit breaker 6 refers to the detection result of the system information detection device 15 and is closed when the power system 1 is in a non-power failure state. By electrically connecting the power line 2, power is supplied from the power line 2 to the second power consuming device 13. Moreover, the circuit breaker 6 refers to the detection result of the system information detection device 15 and opens the power system 1 if the power system 1 is in a power outage state to electrically disconnect the second power consuming device 13 and the power line 2. Thus, power is not supplied from the power line 2 to the second power consuming device 13.

With this configuration, when the power system 1 is in a non-power failure state, the power generation device 11 refers to the detection result of the current transformer CT1 and uses the power consumption of the first power consumption device 12 and the second power consumption device. The power corresponding to the total power with the 13 power consumption or the power equal to or lower than the total power is supplied to the power line 2. That is, the operating rate of the power generator 11 can be increased. In addition, when the total power of the power consumption of the first power consumption device 12 and the power consumption of the second power consumption device 13 exceeds the power generation power of the power generation device 11, the power generation device 11 supplies only less than the total power. Although it is not possible, the insufficient power can be provided for either or both of the discharge power of the charging / discharging device 10 and the power supplied from the power system 1.
On the other hand, when the power system 1 is in a power failure state, the power generation device 11 refers to the detection result of the current transformer CT2 and supplies the power consumption of the first power consumption device 12 or power less than the power consumption to the power line 2. To supply. That is, it can avoid that the electric power generating apparatus 11 becomes overloaded. In this case as well, when the power consumed by the first power consuming device 12 exceeds the power generated by the power generating device 11, the power generating device 11 can supply only the power less than the power consumed, but the insufficient power is charged / discharged. it can be covered by the discharge power of the device 10.

<Fourth embodiment>
In the distributed power supply system of the fourth embodiment, the detection position of the current transformer CT1 is different from that of the third embodiment. The configuration of the distributed power supply system of the fourth embodiment will be described below, but the description of the same configuration as that of the third embodiment will be omitted.

FIG. 4 is a diagram illustrating the configuration of the distributed power supply system according to the fourth embodiment. In the present embodiment, the fourth connection point P4 where the second power consuming device 13 is connected to the power line 2 is the third connection point P3 where the first power consuming device 12 is connected to the power line 2, and the power generator 11 is the power line 2. And the downstream side of the first connection point P1 where the charging / discharging device 10 is connected to the power line 2 (that is, the side away from the power system 1). ). Furthermore, the detection position of the current transformer CT1 is closer to the power system 1 than the first connection point P1 where the charging / discharging device 10 is connected to the power line 2.

Specifically, when the power system 1 is in a non-power failure state, the power generation device 11 refers to the detection result (first signal) of the current transformer CT1 to change the power flow in the power line 2 from the fourth connection point P4. Also, the generated power is controlled under the condition that the power system 1 does not go from the predetermined location (first connection location P1) on the power system 1 side. That is, the power generated by the power generation device 11 can be supplied to the charging / discharging device 10 as well.
On the other hand, when the power system 1 is in a power failure state, the power generation device 11 refers to the detection result (second signal) of the current transformer CT2 and transmits the power flow on the power line 2 from the third connection point P3. The generated power is controlled under the condition that it does not go to the grid 1 side.

<Another embodiment>
<1>
In the above embodiment, several configurations of the distributed power supply system are illustrated, but the configuration may be further changed. For example, another power consuming device may be additionally provided.

<2>
In the above embodiment, the system information detection apparatus 15 is an apparatus that detects the voltage of power on the power line 2 as system information. However, the system information detection apparatus 15 having another configuration can also be used. For example, a device that detects the zero-cross point of the AC voltage of the power system 1 as system information can be used as the system information detection device 15. For example, when the frequency of the AC voltage is 60 Hz, the zero cross point is detected every half cycle of the AC voltage, that is, about every 8 msec. Therefore, after the zero cross point is detected, the grid information detection device 15 determines that the power system 1 is in a power failure state when the next zero cross point cannot be detected even after elapse of 9 msec, for example. To communicate. In addition, after the zero cross point is detected, for example, when the next zero cross point can be detected before 9 msec has elapsed, the grid information detection device 15 determines that the power grid 1 is in a non-power failure state, and the determination result is You may transmit to each apparatus.

<3>
1 and 2 of the above-described embodiment, the system information detection device 15 may be configured to detect system information immediately upstream of the circuit breaker 3 (on the power system 1 side). 1-4 of the said embodiment, it is set as the structure by which the charging / discharging apparatus 10 contains the system | strain information detection apparatus 15 provided in the upstream immediately (the electric power system 1 side) of the circuit breaker 3 or the circuit breaker 3. FIG. Also good.

<4>
In the above embodiment, a natural energy power generation device such as a solar power generation device is connected to the power line 2 on the power system 1 side of the detection position of the current transformer CT1 of the distributed power supply system shown in FIGS. Also good. In this case, the power generation device 11 covers as much power consumption as possible on the downstream side (side away from the power system 1) from the detection position of the current transformer CT1, that is, power consumption on the downstream side of the natural energy power generation device. When it operates, the surplus of the generated power of the natural energy power generation device increases. As a result, the electric power that can be sold from the natural energy power generation apparatus to the electric power system 1 can be increased .

  INDUSTRIAL APPLICABILITY The present invention can be used in a distributed power supply system that can avoid overloading of a power generation device and a charge / discharge device while increasing the operating rate of the power generation device.

DESCRIPTION OF SYMBOLS 1 Power system 2 Power line 4 1st signal line 5 2nd signal line 10 Charging / discharging apparatus 10b Power storage part 11 Power generation apparatus 12 1st power consumption apparatus 13 2nd power consumption apparatus 14 Switching apparatus 14a Switching device 14b Switching control part 15 System information Detection device P1 1st connection location P2 2nd connection location P3 3rd connection location P4 4th connection location

Claims (5)

A power line connected to a power system, a charge / discharge device having a power storage unit connected to the power line at a first connection location, a power generation device connected to the power line at a second connection location, and the power line A distributed power supply system comprising a first power consuming device connected at a third connection location with respect to
A second power consuming device connected to the power line at a fourth connection point;
Wherein said first connection point toward the downstream side as viewed from the connection point of the power system and the third connecting portion and the second connecting portion is provided at its sorted with respect to the power line, the fourth connecting portion has the Provided on the power system side from the third connection location ,
The power generation device controls the generated power under a condition that when the power system is in a power failure state, the power flow in the power line is not directed toward the power system side than the third connection point , the power system When the power is in a non-power failure state, the generated power is controlled under the condition that the power flow in the power line is not directed to the power system side rather than the predetermined part on the power system side than the fourth connection place. Configured,
When the power system is in a power failure state, the charge / discharge device, the power generation device, and the first power consumption device are electrically connected to each other via the power line, and the second power consumption device is Electrically disconnected from the discharge device, the power generation device and the first power consuming device;
When the power system is in a non-power failure state, the charge / discharge device, the power generation device, the first power consumption device, and the second power consumption device are electrically connected to each other via the power line. system.   The fourth connection location where the second power consuming device is connected to the power line is closer to the power system than the first connection location where the charge / discharge device is connected to the power line. 2. A distributed power supply system according to 1. A system information detection device that detects system information capable of determining whether the power system is in a power outage state or a non-power outage state,
The distributed power supply system according to claim 1 or 2, wherein the power generation device determines whether the power system is in a power outage state or a non-power outage state based on the system information received from the system information detection device. . The power generator includes a first signal that represents a power flow from the predetermined location on the power system side to the power system side relative to the fourth connection location, and power that is directed from the third connection location to the power system side. Receiving a second signal representing a tidal current and controlling the generated power with reference to the second signal when it is determined that the power system is in a power failure state based on the system information received from the system information detecting device; The distributed power supply system according to claim 3, wherein when it is determined that the power system is in a non-power failure state, the generated power is controlled with reference to the first signal. A system information detection device for detecting system information capable of determining whether the power system is in a power outage state or in a non-power outage state;
A first signal line to which a first signal representing a power flow from the predetermined location on the power system side to the power system side than the fourth connection location is input, and from the third connection location to the power system. A switch to which a second signal line to which a second signal representing a power flow toward the side is input is connected; a first switching state in which the first signal line is connected to the power generator; and the second signal line A switching device having a switching control unit that switches the switch to any one of the second switching states connected to the power generation device;
The switching control unit switches the switch to the first switching state when the power system is in a non-power failure state based on the system information received from the system information detection device, and the power system is in a power failure state. 3. The distributed power supply system according to claim 1, wherein the switch is switched to the second switching state.

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