JP2024033997A - power system - Google Patents

Abstract

An object of the present invention is to provide a power system that can perform appropriate energy management even when power is transmitted via a power system. SOLUTION: A power system S1 is a power system S1 that supplies power to a power consumer facility L1 via a power system, in which at least one first power device Y1 is individually connected to each connected first power device Y1. At least one first power control device B1 that can control the first output power from one power device Y1 to the power grid, a monitoring device D1 that monitors power consumption of the power consumer equipment L1, and a monitoring device D1 and at least one The first power control device B1 includes a processing device A1 that can communicate with the first power control device B1. The processing device A1 calculates a control command value for each of the at least one first power control device B1, taking into consideration power consumption and transmission loss that occurs in power transmission via the power system. At least one first power control device B1 controls the first output power based on the control command value. [Selection diagram] Figure 1

Description

TECHNICAL FIELD This disclosure relates to power systems.

BACKGROUND ART Power systems that supply power to loads from a plurality of power devices (distributed power sources) are conventionally known. For example, Patent Document 1 discloses a power system that performs power control using a plurality of power devices. The power system described in Patent Document 1 includes a plurality of power control devices. A corresponding power device is connected to each of the plurality of power control devices. Each power control device controls the output power of the connected power equipment and supplies power to the load. In the power system described in Patent Document 1, solar cells, storage batteries, electric vehicles, and the like are used as power devices, for example. Further, Patent Document 2 discloses an electric power system that takes into consideration power interchange between regions. In the power system described in Patent Document 2, power is transmitted between two power systems connected by an interregional interconnection line.

Japanese Patent Application Publication No. 2020-150690 Japanese Patent Application Publication No. 2012-5302

When transmitting power via a power grid as in Patent Document 2, a transmission loss occurs during power transmission via the power grid. This transmission loss causes a difference between the power at the transmission source and the power at the transmission destination. In conventional power systems, such transmission losses are not taken into account, and therefore a difference occurs between the power transmitted from the power equipment and supplied to the load and the power required by the load. For this reason, it becomes necessary to purchase electricity from, for example, an electric power company for such a power difference. As described above, in conventional power systems, there is room for improvement in energy management that effectively utilizes power from power equipment.

The present disclosure was devised in view of the above circumstances, and its purpose is to provide an electric power system that can perform appropriate energy management even when transmitting electric power via an electric power system. There is a particular thing.

The power system of the present disclosure is a power system that supplies power to power consumer equipment via a power system, in which at least one first power device is individually connected to the connected first power device. at least one first power control device capable of controlling first output power to the power system; a monitoring device that monitors power consumption of the power consumer equipment; the monitoring device and the at least one first power control device; a processing device capable of communicating with the device, the processing device controlling each of the at least one first power control device in consideration of the power consumption and a transmission loss occurring in power transmission via the power system. A command value is calculated, and the at least one first power control device controls the first output power based on the control command value.

In a preferred embodiment of the power system, at least one second power device is each individually connected, and at least one second power device monitors a second output power from the connected second power device to the power grid. The processing device further includes a power control device, wherein the processing device is capable of communicating with each of the at least one second power control device, and the processing device includes a target setting unit that sets a target power by taking the consignment loss into account. , the first output power of each of the at least one first power control device, the second output power of each of the at least one second power control device, and the power consumption are acquired, and the power system a first calculation unit that calculates the overall output power of the power output device; and a second calculation unit that calculates the control command value for making the overall output power equal to the target power.

In a preferred embodiment of the power system, the at least one first power control device includes a storage battery control device to which a storage battery is connected and which controls charging and discharging of the storage battery, and a storage battery control device to which an electric vehicle is connected and which controls charging and discharging of the electric vehicle. It includes at least one of an EV control device that controls an EV, and a solar power generation control device that is connected to a solar cell and controls the amount of power generated by the solar cell.

In a preferred embodiment of the power system, the at least one first power control device includes a comprehensive control device, and the comprehensive control device includes a plurality of lower control devices to which the first power equipment is connected; a management device that manages a plurality of lower-order control devices, the management device calculating a lower-order target power based on the control command value, and controlling each of the plurality of lower-order control devices based on the calculated lower-order target power. and each of the plurality of lower-order control devices calculates a lower-order control command value for the first output of the connected first power device based on the lower-order control command value calculated by the comprehensive control device. Control power.

In a preferred embodiment of the power system, there are a plurality of first power control devices, and the control command value is a guidance command value that is common to each of the plurality of first power control devices; Each of the first power control devices calculates a target value of the first output power using the received guidance command value, and controls the first output power so as to reach the target value.

In the power system of the present disclosure, the control command value for each first power control device is calculated in consideration of the transmission loss that occurs in power transmission via the power system. Therefore, each first power control device controls the first output power based on the control command value, thereby performing power control in consideration of transmission loss. This suppresses the difference between the power transmitted from the power equipment and supplied to the load and the power required by the load. Therefore, the power system of the present disclosure can perform appropriate energy management even when power is transmitted via the power grid.

FIG. 1 is an overall configuration diagram showing a power system according to a first embodiment. 3 is a flowchart showing power control performed by the power system according to the first embodiment. FIG. 2 is an overall configuration diagram showing a power system according to a second embodiment. It is a flowchart which shows the control performed by the comprehensive control apparatus of the electric power system based on 2nd Embodiment. FIG. 7 is an overall configuration diagram showing a power system according to a third embodiment.

A preferred embodiment of the power system of the present disclosure will be described below with reference to the drawings. Hereinafter, the same or similar components will be denoted by the same reference numerals, and redundant explanation will be omitted.

FIG. 1 shows an example of the overall configuration of a power system S1 according to the first embodiment. The power system S1 includes a processing device A1, at least one first power control device B1, at least one second power control device C1, and at least one monitoring device D1. In the illustrated example, the power system S1 includes three first power control devices B1, one second power control device C1, and one monitoring device D1. and the number of monitoring devices D1 are not limited to this example. In FIG. 1, thick lines indicate power networks and dashed lines indicate communication networks.

Power system S1 supplies power to power consumer equipment L1 via power line 99. Power line 99 is connected to the power grid. In the present disclosure, power transmission via the power system includes power transmission via power line 99. The power consumer equipment L1 is connected to the power line 99 by a connection line 93, and is supplied with power from either or both of the power grid and the power system S1. The power consumer equipment L1 may have a configuration including one power load, or may have a configuration including a plurality of power loads. Power loads include general loads, important loads, and the like. General loads include, for example, electrical equipment that is relatively unaffected even if power is cut off during a disaster. Important loads are important loads that require continuous power supply even in the event of a disaster, and include, for example, emergency elevators, electrical equipment that requires continuous operation, building lighting and air conditioning equipment, etc.

In the power system S1, the processing device A1, each first power control device B1, each second power control device C1, and the monitoring device D1 perform power control in cooperation. In the power control, the processing device A1 acquires the output power of the power device (first power device Y1) from each first power control device B1. Furthermore, the processing device A1 acquires the output power of the power device (second power device Y2) from each second power control device C1. Furthermore, the processing device A1 acquires the output power (power consumption) of the power consumer equipment L1 from the monitoring device D1. Then, the processing device A1 calculates a control command value for each first power control device B1, taking into consideration the power information and the transmission loss. The transmission loss is a loss that occurs during power transmission via the power system (power line 99). In this embodiment, the processing device A1 calculates, as the control command value, a guidance command value that has a common value in each first power control device B1. The guidance command value is the same as that described in Patent Document 1. Each first power control device B1 calculates an output target value of a connected power device (first power device Y1) based on the control command value (guidance command value) calculated by the processing device A1, and outputs the calculated output. Based on the target value, the output power of the connected power device (first power device Y1) is controlled. Through such power control, the power supplied from the power system S1 to the power consumer equipment L1 is adjusted.

Each of the plurality of first power control devices B1 is connected to a power line 99 through a connection line 91, as shown in FIG. A first power device Y1 is connected to each of the plurality of first power control devices B1. Each of the plurality of first power control devices B1 controls the output power (hereinafter referred to as "first output power") of the first power device Y1 to which it is connected. In the illustrated example, one first power device Y1 is connected to one first power control device B1, but unlike this example, one first power control device B1 is connected to one first power device Y1. A plurality of first power devices Y1 may be connected.

The plurality of first power control devices B1 include a storage battery control device B11, an EV control device B12, and a solar power generation control device B13. Hereinafter, the solar power generation control device B13 will be referred to as "PV control device B13." EV is an abbreviation for Electric Vehicle. PV is an abbreviation for Photovoltaics. In addition, control devices that control power generation using other renewable energies (wind, water, biomass, geothermal, etc.), control devices that control power generation using fuel cells, control devices that control power generation using fossil fuels, It may also include a control device that controls virtual power generation that manages the load of consumers by the aggregator. Although aggregators do not actually generate electricity, they consider the electricity saved through negawatt trading as generated electricity.

A storage battery Y11 as a first power device Y1 is connected to the storage battery control device B11. The storage battery control device B11 charges and discharges the connected storage battery Y11. The storage battery control device B11 charges the storage battery Y11 by supplying power input from the power line 99 side to the storage battery Y11. Moreover, the storage battery control device B11 discharges the storage battery Y11 by outputting the electric power accumulated in the storage battery Y11 to the power line 99 side.

An electric vehicle Y12 as a first power device Y1 is connected to the EV control device B12. The EV control device B12 charges and discharges the connected electric vehicle Y12. Note that charging and discharging the electric vehicle Y12 means charging and discharging a storage battery (a storage battery that supplies power to the electric motor) mounted on the electric vehicle Y12. The EV control device B12 charges the electric vehicle Y12 by supplying electric power input from the power line 99 side to the electric vehicle Y12. Further, the EV control device B12 discharges the electric vehicle Y12 by outputting the electric power accumulated in the electric vehicle Y12 to the power line 99 side.

A solar cell Y13 as a first power device Y1 is connected to the PV control device B13. PV control device B13 performs power generation control of connected solar cell Y13. The PV control device B13 is capable of controlling the amount of power generated by the solar cell Y13 (suppression of power generation). PV control device B13 outputs the power generated by solar cell Y13 to the power line 99 side.

Each of the plurality of first power control devices B1 (storage battery control device B11, EV control device B12, and PV control device B13) includes a first measurement section 11, a first signal processing section 12, and a first power conversion section 13.

The first measurement unit 11 is installed on the connection line 91. In the illustrated example, the first measurement section 11 is installed closer to the power line 99 than the first power conversion section 13 in the connection line 91 . The first measuring section 11 measures the power (first output power) at the installation location and outputs it to the first signal processing section 12 .

The first signal processing unit 12 converts the measurement result (analog value) of the first measurement unit 11 into a measurement value (digital value) of the first output power, and transmits it to the processing device A1. When power is being output from the first power control device B1 to the power line 99 side, the measured value of the first output power is a positive value. On the other hand, when power is being output from the power line 99 side to the first power control device B1, the measured value of the first output power becomes a negative value.

The first signal processing unit 12 also receives a control command value from the processing device A1. The first signal processing section 12 calculates an output target value of the first output power based on the received control command value, and outputs it to the first power conversion section 13. In this embodiment, the first signal processing unit 12 receives the guidance command value as the control command value. Then, an output target value of the first output power is calculated based on an optimization problem using the guidance command value. This optimization problem includes an evaluation function and constraints. The evaluation function is the same as that described in Patent Document 1, for example. In this embodiment, the first signal processing unit 12 calculates the following equation (1) and the following equation (2) derived from the evaluation function, similarly to the description in Patent Document 1. In the following equation (1) and the following equation (2), P ^ref is the output target value of the first output power in the first power control device B1, pr is the guidance command value, pr ^lmt is the guidance command value limit, a ₁ to a ₄ are design parameters, respectively. The guidance command value limit pr ^lmt and the design parameters a ₁ to a ₄ are the same as those described in Patent Document 1. Then, similarly to the description in Patent Document 1, the output target value is calculated by correcting the calculation result using the constraint conditions. The constraint conditions are similar to those described in Patent Document 1. Note that the constraint conditions set in the storage battery PCS described in Patent Document 1 are set in the first signal processing unit 12 of the storage battery control device B11, and the constraint conditions set in the EV stand described in Patent Document 1 are set in the EV stand described in Patent Document 1. The constraint conditions set in the first signal processing unit 12 of the control device B12 and set in the solar PCS described in Patent Document 1 are set in the first signal processing unit 12 of the PV control device B13. Differently from this, the first signal processing unit 12 may calculate the output target value by solving the evaluation function under constraint conditions. The first signal processing section 12 outputs the calculated output target value to the first power conversion section 13.

The first power conversion unit 13 is connected between the power line 99 and the first power equipment Y1, and performs power conversion between them. For example, if the first power device Y1 is a DC power supply, the first power conversion unit 13 performs DC/AC conversion. The first power conversion unit 13 controls the first output power during power conversion. The first power conversion unit 13 controls the first output power (output power or input power of the first power device Y1) based on the output target value input from the first signal processing unit 12. The first power conversion unit 13 of the storage battery control device B11 controls charging power or discharging power of the storage battery Y11. In the present disclosure, the first power conversion unit 13 of the storage battery control device B11 discharges the storage battery Y11 when the received output target value is a positive value, and discharges the storage battery Y11 when the received output target value is a negative value. Charge. The first power conversion unit 13 of the EV control device B12 controls charging power or discharging power of the electric vehicle Y12. In the present disclosure, the first power conversion unit 13 of the EV control device B12 discharges the electric vehicle Y12 when the received output target value is a positive value, and discharges the electric vehicle Y12 when the received output target value is a negative value. Charge Y12. The first power conversion unit 13 of the PV control device B13 controls the power generated by the solar cell Y13.

The second power control device C1 is connected to a power line 99 through a connection line 92, as shown in FIG. A second power device Y2 is connected to the second power control device C1. The second power control device C1 monitors the output power (hereinafter referred to as "second output power") of the connected second power device Y2. The second power control device C1 does not control the second output power of the connected second power device Y2 (however, it performs power conversion as described later). In the illustrated example, one second power device Y2 is connected to the second power control device C1, but unlike this example, a plurality of second power devices Y2 are connected to the second power control device C1. Power equipment Y2 may be connected. Each of the first power equipment Y1, each of the second power equipment Y2, and the power consumer equipment L1 may be installed separately on a plurality of lands (bases), or may be installed on the same land (base). .

The second power control device C1 includes a PV control device C11. A solar cell Y21 as a second power device Y2 is connected to the PV control device C11. Unlike the PV control device B13, the PV control device C11 directly outputs the power generated by the solar cell Y21. That is, the PV control device C11 does not control (suppress) the power generated by the solar cell Y21. Note that the second power control device C1 is a generator that generates power (wind power generation, geothermal power generation, hydroelectric power generation, etc.) using renewable energy, instead of or in addition to the PV control device C11. It may also include a connected power generation control device.

The second power control device C1 (PV control device C11) includes a second measurement section 21, a second signal processing section 22, and a second power conversion section 23.

The second measurement unit 21 is installed on the connection line 92. In the illustrated example, the second measurement section 21 is installed closer to the power line 99 than the second power conversion section 23 in the connection line 92 . The second measuring section 21 measures the power (second output power) at the installation location and outputs it to the second signal processing section 22 .

The second signal processing unit 22 converts the measurement result (analog value) of the second measurement unit 21 into a measurement value (digital value) of the second output power, and transmits it to the processing device A1. When power is being output from the second power control device C1 to the power line 99 side, the measured value of the second output power is a positive value. On the other hand, when power is being output from the power line 99 side to the second power control device C1, the measured value of the second output power becomes a negative value.

The second power conversion unit 23 is connected between the power line 99 and the second power equipment Y2, and performs power conversion between them. For example, if the second power device Y2 is a DC power supply, the second power conversion unit 23 performs DC/AC conversion. The second power conversion unit 23 does not control the second output power (for example, control to change the magnitude) during power conversion. In such a configuration, the second power control device C1 outputs the power input from the second power device Y2 to the power line 99 without changing the magnitude of the power.

The monitoring device D1 monitors the power consumption of the power consumer equipment L1. When the power consumer equipment L1 has multiple power loads, the monitoring device D1 may monitor the multiple power loads at once with one device, or monitor the multiple power loads individually with multiple devices. May be monitored. The monitoring device D1 includes a third measurement section 31 and a third signal processing section 32.

The third measurement unit 31 is installed on the connection line 93. The third measuring section 31 measures the power (power consumption) at the installation location and outputs it to the third signal processing section 32.

The third signal processing section 32 converts the measurement result (analog value) of the third measurement section 31 into a measured value (digital value) of power consumption, and transmits it to the processing device A1. When power is being supplied to the power consumer equipment L1, the measured value of power consumption is a negative value.

The processing device A1 is capable of bidirectional communication with each first power control device B1. The processing device A1 is capable of one-way communication with each second power control device C1 and each monitoring device D1. The processing device A1 acquires the first output power from each first power control device B1, the second output power from each second power control device C1, and the power consumption from each monitoring device D1. Furthermore, the processing device A1 calculates the consignment loss in the power system S1. Processing device A1 calculates a control command value for each first power control device B1 based on the acquired first output power, second output power, and power consumption, and the calculated consignment loss. Processing device A1 transmits the calculated control command value to each first power control device B1. As shown in FIG. 1, the processing device A1 includes a first calculation section 41, a loss calculation section 42, a goal setting section 43, a second calculation section 44, and a communication section 45.

The communication unit 45 communicates with each of the plurality of first power control devices B1, the second power control device C1, and the monitoring device D1.

The first calculation unit 41 calculates the overall output power of the power system S1. The first calculation unit 41 receives the first output power from each of the plurality of first power control devices B1, the second output power from the second power control device C1, and the power consumption from the monitoring device D1 via the communication unit 45. Get each. Then, total output power is calculated by adding these together.

The loss calculation unit 42 calculates the transmission loss (transmission loss that occurs in power transmission via the power line 99) in the power system S1. The consignment loss is calculated by storing a fixed value in the power system S1 and reading out the fixed value. Unlike this example, the consignment loss, like the power transmission and distribution loss in a general consignment system, is based on the setting of the demand of the electric power customer equipment L1 and the contract voltage band of the customer operating the electric power customer equipment L1. You may multiply the base by a fixed ratio. Alternatively, a composite calculation may be performed according to the geographical information of each power device (first power device Y1 and second power device Y2).

The target setting unit 43 sets a target value for the overall output power of the power system S1 (hereinafter referred to as "target power"), taking into consideration the consignment loss. As the target power, for example, a value obtained by adding the transmission loss to the provisional target value is set. That is, the target setting unit 43 sets a value obtained by adding the transmission loss to the provisional target value as the target power. In one example, the provisional target value is 0 (zero). The provisional target value of 0 (zero) is a value at which the sum of the first output power and the second output power matches the power consumption, assuming that there is no transmission loss. In other words, assuming that there is no transmission loss, all the power consumed by the power consumer equipment L1 is the first output power of each first power device Y1 and the second output power from the second power device Y2, It is being supplied. Unlike this example, the provisional target value is a value larger than 0 (zero) as a rule of thumb so that a predetermined amount of power is always received from the power grid (power is output from the power grid to power consumer facility L1). value) may be set.

The second calculation unit 44 calculates a control command value for making the overall output power the target power. The second calculation unit 44 calculates the guidance command value by, for example, calculating the following equation (3) and the following equation (4). In equations (3) and (4) below, pr is the guidance command value, λp is the state variable, P _C is the target power (active power), P is the current overall output power (active power), and ε is the slope coefficient , Ts is the update interval of the guidance command value. Note that the following formula (3) and the following formula (4) are equivalent to the calculation formula described in Patent Document 1. The second calculation unit 44 transmits the calculated guidance command value to each first power control device B1 via the communication unit 45.

FIG. 2 is a flowchart showing power control performed by the power system S1. FIG. 2(a) shows the processing performed by each first power control device B1. FIG. 2(b) shows the processing performed by the second power control device C1. FIG. 2(c) shows the processing performed by the monitoring device D1. FIG. 2(d) shows the processing performed by the processing device A1. The power system S1 repeatedly performs the process shown in FIG. 2 at a predetermined period.

As shown in FIG. 2(a), each first power control device B1 measures the first output power by the first measurement unit 11 (S101). Each first power control device B1 transmits the measured value of the first output power to the processing device A1 by the first signal processing unit 12 (S102). As shown in FIG. 2(d), the processing device A1 receives the measured value of the first output power from each first power control device B1 (S401).

As shown in FIG. 2(b), the second power control device C1 measures the second output power using the second measurement unit 21 (S201). The second power control device C1 transmits the measured value of the second output power to the processing device A1 by the second signal processing unit 22 (S202). As shown in FIG. 2(d), the processing device A1 receives the measured value of the second output power from the second power control device C1 (S402).

As shown in FIG. 2(c), the monitoring device D1 measures power consumption using the third measurement unit 31 (S301). The monitoring device D1 transmits the measured value of power consumption to the processing device A1 by the third signal processing unit 32 (S302). As shown in FIG. 2(d), the processing device A1 receives the measured value of power consumption from the monitoring device D1 (S403).

As shown in FIG. 2(d), the processing device A1 receives each measured value of the first output power received in step S401, the measured value of the second output power received in step S402, and the consumption value received in step S403. The total output power of the power system S1 is calculated by adding the measured power values (S404). Next, the processing device A1 calculates the transmission loss caused by power transmission via the power line 99 (S405). The calculation of the consignment loss is performed by the loss calculation unit 42, as described above. Next, the processing device A1 sets the target power by taking into consideration the consignment loss calculated in step S405 (S406). The calculation of the target power is performed by the target setting unit 43 as described above. Next, the processing device A1 calculates a control command value (S407). In this embodiment, the processing device A1 calculates the guidance command value obtained by calculating the above equation (3) and the above equation (4) as the control command value. Next, the processing device A1 transmits the calculated control command value (guidance command value) to each first power control device B1 (S408). Each first power control device B1 receives a control command value (guidance command value) from the processing device A1, as shown in FIG. 2(a) (S103).

As shown in FIG. 2(a), when each first power control device B1 receives the control command value (guidance command value) in step S103, the first power control device B1 determines the first power device Y1 to be connected based on the control command value. The output target value is calculated (S104). In this embodiment, each first power control device B1 receives a guidance command value as a control command value, and uses the received guidance command value to calculate the above equation (1) and the above equation (2). . Through this calculation, each first power control device B1 calculates the output target value of the first power device Y1. Next, each first power control device B1 controls the first output power based on the calculated output target value (S105).

The power control of the power system S1 described above (the process shown in FIG. 2) is an example, and is not limited thereto. For example, in the example described above, the processing device A1 calculated the control command value so that the overall output power becomes the target power taking into account the transmission loss. For convenience of understanding, the sum of each first output power is ΣP ₁ i, the sum of each second output power is ΣP ₂ i, the sum of each power consumption is ΣP _L1 i, the provisional target value is P _t0 , and the transmission loss is P _Loss shall be. Note that i indicates the i-th device (first power control device B1, second power control device C1, or monitoring device D1). At this time, in the process of FIG. 2, the processing device A1 calculates a control command value that satisfies ΣP ₁ i+ΣP ₂ i+ΣP _L1 i=P _t0 +P _Loss . In a configuration different from this example, the following configuration may be used. That is, the processing device A1 may calculate the control command value so that the overall output power including the transmission loss becomes the provisional target value (ΣP ₁ i + ΣP ₂ i + ΣP _L1 i−P _Loss =P _t0 ). . Alternatively, the processing device A1 calculates the absolute value of ΣP ₁ i+ΣP ₂ i= _ΣP value + P _Loss ), the control command value may be calculated, or the power consumption may be calculated by adding the consignment loss to the sum of the total value of the first output power and the total value of the second output power. (ΣP ₁ i+ΣP ₂ i−P _Loss =absolute value of ΣP _L1 i), the control command value may be calculated.

The functions and effects of the power system S1 are as follows. In the power system S1, a control command value for each first power control device B1 is calculated in consideration of a transmission loss that occurs in power transmission via the power system (power line 99). According to such a configuration, for example, when power is supplied from the first power equipment Y1 and the second power equipment Y2 to the power consumer equipment L1, the power obtained by adding the transmission loss to the power consumption of the power consumer equipment L1 is can be transmitted from the first power device Y1 and the second power device Y2. This suppresses the difference between the power required by the power consumer equipment L1 and the power transmitted from the power system S1 (first power equipment Y1, second power equipment Y2, etc.) to the power consumer equipment L1. . For example, in the power system S1, all of the power required by the power consumer equipment L1 can be transmitted from the first power equipment Y1 and the second power equipment Y2, so power is purchased from the power company etc. There will be no need. Therefore, the power system S1 can perform appropriate energy management even when transmitting power via the power grid. Thereby, the power system S1 can efficiently utilize renewable energy from the first power equipment Y1, the second power equipment Y2, etc. in supplying power to the power consumer facility L1.

FIG. 3 shows a power system S2 according to the second embodiment. The power system S2 differs from the power system S1 in that the plurality of first power control devices B1 include a comprehensive control device B15. In the illustrated example, the plurality of first power control devices B1 include a storage battery control device B11 and a comprehensive control device B15, but in addition, one or both of an EV control device B12 and a PV control device B13. May contain. Further, a plurality of comprehensive control devices B15 may be included.

The comprehensive control device B15 is connected to a power line 99 via a connection line 95. A plurality of first power devices Y1 are connected to the comprehensive control device B15. The plurality of first power devices Y1 are connected to the power line 99 via the connection point K1. The comprehensive control device B15 controls the plurality of first power devices Y1. The comprehensive control device B15 includes a management device B150 and a plurality of lower control devices B151.

The management device B150 manages a plurality of lower control devices B151. A corresponding first power device Y1 among the plurality of first power devices Y1 connected to the comprehensive control device B15 is connected to each of the plurality of lower control devices B151. Each of the plurality of lower control devices B151 performs power control of the first power device Y1 to which it is connected. In the illustrated example, each of the plurality of lower control devices B151 is an EV control device to which an electric vehicle Y12 as the first power device Y1 is connected. That is, each of the plurality of lower control devices B151 controls the output power (hereinafter referred to as "lower output power") by controlling charging and discharging of the electric vehicle Y12. Unlike the illustrated example, the plurality of first power devices Y1 connected to the comprehensive control device B15 may include, in addition to the electric vehicle Y12, a storage battery Y11, a solar cell Y13, and the like. In this embodiment, the sum of the lower output power of each lower control device B151 corresponds to the first output power of the comprehensive control device B15. As shown in FIG. 3, the management device B150 includes a measurement section 51 and a signal processing section 521, and each of the plurality of lower control devices B151 includes a signal processing section 522 and a power conversion section 531.

The measurement unit 51 is installed on the connection line 95. In the illustrated example, the measurement unit 51 is installed on the power line 99 side of the connection line 95 with respect to the connection point K1. The measurement unit 51 measures the power at the installation location (first output power in the comprehensive control device B15) and outputs it to the signal processing unit 521.

The signal processing unit 521 converts the measurement result (analog value) of the measurement unit 51 into a measured value (digital value) of the first output power in the comprehensive control device B15, and transmits it to the processing device A1. Further, the signal processing unit 521 receives a control command value from the processing device A1. In this embodiment, the control command value calculated by the processing device A1 is referred to as an "overall control command value." The signal processing unit 521 calculates an output target value (hereinafter referred to as "lower target power") of the first output power in the comprehensive control device B15 based on the received overall control command value. Then, based on the calculated lower-order target power, lower-order control command values for the plurality of lower-order control devices B151 are calculated. In this embodiment, the signal processing unit 521 calculates a lower-order guidance command value common to the plurality of lower-order control devices B151 as the lower-order control command value. For example, the signal processing unit 521 calculates the lower guidance command value by calculating the above equation (3) and the above equation (4). However, in the calculation of the lower guidance command value, pr in the above formulas (3) and (4) is the lower guidance command value, P _C is the lower target power (active power), and P is the current comprehensive control device B15. The first output power and Ts are respectively replaced with the update interval of the lower guidance command value. The signal processing unit 521 transmits the calculated lower-order control command value (lower-order guidance command value) to the plurality of lower-order control devices B151.

The signal processing unit 522 receives the lower control command value from the management device B150. The signal processing unit 522 calculates a target value of lower output power based on the lower control command value. In this embodiment, the signal processing unit 522 receives the lower-order guidance command value as the lower-order control command value, and calculates the target value of the lower-order output power based on an optimization problem using the lower-order guidance command value. . The signal processing unit 522 calculates the output target value of each lower control device B151, for example, by calculating the above equations (1) and (2). However, in calculating the output target value of each lower-order control device B151, P ^ref in the above equation (1) is replaced with the output target value of the lower-order output power, and pr is replaced with the lower-order guidance command value. The signal processing unit 522 outputs the calculated output target value of the lower output power to the power conversion unit 531.

Like the first power converter 13, the power converter 531 is connected between the power line 99 and the first power device Y1, and performs power conversion between them. The power conversion unit 531 controls lower output power during power conversion. The power conversion unit 531 controls the lower output power (output power or input power of the first power device Y1) based on the target value input from the signal processing unit 522. In this embodiment, since the electric vehicle Y12 as the first power device Y1 is connected to each lower control device B151, the power conversion unit 531 controls the charging power or discharging power of the electric vehicle Y12.

FIG. 4 is a flowchart showing the control performed by the comprehensive control device B15. FIG. 4(a) shows the processing performed by the management device B150, and FIG. 4(b) shows the processing performed by each lower control device B151. The process shown in FIG. 4 is performed every time a control command value is transmitted from the processing device A1.

As shown in FIG. 4(a), the management device B150 receives the overall control command value from the processing device A1 (S501). As mentioned above, the overall control command value is a guidance command value that is common to each first power control device B1 (including the comprehensive control device B15). Next, the management device B150 calculates the lower target power using the overall control command value (S502). Next, the management device B150 uses the measurement unit 51 to measure the first output power in the comprehensive control device B15 (S503). Next, the management device B150 calculates lower-level control command values for the plurality of lower-level control devices B151 using the measurement result of the measurement unit 51 (the measured value of the first output power in the comprehensive control device B15) and the lower-level target power. (S504). In this embodiment, the lower control command value is a lower guidance command value that has a common value in each lower control device B151. Next, the management device B150 transmits the calculated lower-order control command value (lower-order guidance command value) to each lower-order control device B151 (S505).

As shown in FIG. 4(b), each lower-level control device B151 receives a lower-level control command value from the management device B150 (S601). Next, each lower-level control device B151 calculates a target value of lower-level output power using the lower-level control command value (S602). Next, each lower control device B151 performs output control so that the lower output power becomes the target value calculated in step S602 (S603).

The functions and effects of the power system S2 are as follows. In the power system S2, similarly to the power system S1, the control command value for each first power control device B1 is calculated in consideration of the transmission loss that occurs in power transmission via the power system (power line 99). Therefore, similarly to the power system S1, the power system S2 receives the power required by the power customer equipment L1 and the power transmitted from the power system S2 (first power equipment Y1, second power equipment Y2, etc.) to the power customer equipment. Since the power difference with the power supplied to L1 can be suppressed, appropriate energy management can be performed even when power is transmitted via the power grid. Thereby, the power system S2 can efficiently utilize renewable energy from the first power equipment Y1, the second power equipment Y2, etc. in supplying power to the power consumer facility L1.

Furthermore, in the power system S2, the plurality of first power control devices B1 include a comprehensive control device B15. The comprehensive control device B15 performs power control of the plurality of connected first power devices Y1. In the power control, the comprehensive control device B15 receives the overall control command value from the processing device A1 through the management device B150, and uses the overall control command value to set the target value of the output power of each first power device Y1. Generate a lower control command value for calculation. Then, the lower-level control device B151 performs power control of each first power device Y1 based on the lower-level control command value. According to this configuration, the power control of each first power device Y1 connected to the comprehensive control device B15 is performed based on the lower control command value calculated by the comprehensive control device B15 (management device B150), and the processing device A1 calculates the Based on the overall control command value, power control is performed in consideration of transmission loss. Therefore, even if the power system S2 includes a system that controls a plurality of first power devices Y1 at one power measurement point (measurement point of the measurement unit 51), energy management that takes consignment loss into consideration is possible. Become. In other words, the power system S2 is capable of both power control of multiple devices (the first power device Y1 connected to the comprehensive control device B15) by the comprehensive control device B15 and energy management that takes consignment losses into consideration. be.

FIG. 5 shows a power system S3 according to a third embodiment. The power system S3 differs from the power system S2 in that the second power device Y2 and the load L2 are connected to the comprehensive control device B15. The load L2 consumes power and is connected to the power line 99 via the connection point K1.

The comprehensive control device B15 of the power system S3 includes at least one lower-order control device B151 and at least one lower-order control device B152. This embodiment includes a plurality of lower control devices B151 and one lower control device B152. Note that FIG. 5 illustrates one of the plurality of lower control devices B151.

A second power device Y2 is connected to the lower control device B152. This second power device Y2 is connected to the power line 99 via the connection point K1. Lower control device B152 includes a power conversion section 532. Like the second power converter 23, the power converter 532 is connected between the power line 99 and the second power device Y2 and performs power conversion thereon, as described above. In the illustrated example, the lower control device B152 is a PV control device to which a solar cell Y21 as the second power device Y2 is connected. Unlike this example, the lower control device B152 may be a power generation control device connected to a generator that generates power (wind power generation, geothermal power generation, hydroelectric power generation, etc.) using other renewable energy. The second power device Y2 connected to the lower control device B152 is connected to the power line 99 via the connection point K1.

The functions and effects of the power system S3 are as follows. In the power system S3, similarly to the power systems S1 and S2, the control command value for the first power control device B1 is calculated in consideration of the transmission loss that occurs in power transmission via the power system (power line 99). Therefore, like each of the power systems S1 and S2, the power system S3 receives the power required by the power consumer equipment L1 and the power transmitted from the power system S3 (first power equipment Y1, second power equipment Y2, etc.). Since the power difference with the power supplied to the consumer equipment L1 can be suppressed, appropriate energy management can be performed even when power is transmitted via the power grid. Thereby, the power system S3 can efficiently utilize renewable energy from the first power equipment Y1, the second power equipment Y2, etc. in supplying power to the power consumer facility L1.

Further, in the power system S3, the comprehensive control device B15 is connected to the first power device Y1, as well as the second power device Y2 and the load L2. The comprehensive control device B15 takes into consideration the power consumption by the load L2 and the power generated by the second power device Y2, and controls the lower output power of the first power device Y1 connected to the first power device Y1. Control output power. According to this configuration, even when multiple types of devices (the first power device Y1, the second power device Y2, and the load L2) are connected to one power measurement point (the measurement point of the measurement unit 51), It also becomes possible to manage energy in consideration of shipping losses. In other words, the power system S3 performs power control of a plurality of devices (the first power device Y1, the second power device Y2, and the load L2 connected to the comprehensive control device B15) by the comprehensive control device B15, and the energy consumption in consideration of the consignment loss. It is possible to achieve both management and management.

In the first to third embodiments, each of the power systems S1 to S3 includes at least one second power control device C1, but unlike this example, each of the power systems S1 to S3 includes The second power control device C1 may not be provided.

In the first to third embodiments described above, an example was shown in which the control command value (the overall control command value and the lower control command value) is a guidance command value common to the first power control device B1, but the control command value may be the target value of the first output power of the first power control device B1. That is, the processing device A1 may calculate the output target value of each first power control device B1. In this case, each first power control device B1 performs power control of the first power device Y1 based on the output target value received from the processing device A1. Therefore, in the modified example, the output target value of each first power control device B1 is not calculated in a distributed manner by each first power control device B1, but is calculated all at once by the processing device A1. However, if the guidance command value is used as the control command value, each first power control device B1 controls the first output power in a distributed manner, so that the processing load on the processing device A1 is reduced.

The power system according to the present disclosure is not limited to the embodiments described above. The specific configuration of each part of the power system of the present disclosure can be modified in various ways.

S1, S2, S3: Power system, A1: Processing device, B1: First power control device, B11: Storage battery control device, B12: EV control device, B13: Solar power generation control device (PV control device), B15: Comprehensive Control device, B150: Management device, B151: Lower control device, C1: Second power control device, D1: Monitoring device, L1: Power consumer equipment, Y1: First power equipment, Y11: Storage battery, Y12: Electric vehicle, Y13: Solar cell, Y2: Second power equipment, 41: First calculation section, 42: Loss calculation section, 43: Target setting section, 44: Second calculation section, 45: Communication section

Claims (5)

An electric power system that supplies electric power to electric power consumer equipment via an electric power system,
at least one first power control device to which at least one first power device is individually connected and capable of controlling first output power from the connected first power device to the power system;
a monitoring device that monitors power consumption of the power consumer equipment;
a processing device capable of communicating with the monitoring device and the at least one first power control device;
Equipped with
The processing device calculates a control command value for each of the at least one first power control device in consideration of the power consumption and a transmission loss occurring in power transmission via the power system,
A power system, wherein the at least one first power control device controls the first output power based on the control command value. Further comprising at least one second power control device to which at least one second power device is individually connected and monitors a second output power from the connected second power device to the power system,
the processing device is in communication with each of the at least one second power control device;
The processing device includes:
a target setting unit that sets a target power by taking the wheeling loss into consideration;
The first output power of each of the at least one first power control device, the second output power of each of the at least one second power control device, and the power consumption are obtained to control the power system. a first calculation unit that calculates the overall output power;
The power system according to claim 1, further comprising: a second calculation unit that calculates the control command value for making the overall output power equal to the target power. The at least one first power control device includes a storage battery control device to which a storage battery is connected and which controls charging and discharging of the storage battery, an EV control device to which an electric vehicle is connected and which controls charging and discharging of the electric vehicle, and a solar cell. The power system according to claim 1 or 2, comprising at least one of: a solar power generation control device that is connected to the solar cell and controls the amount of power generated by the solar cell. the at least one first power control device includes a comprehensive control device;
The comprehensive control device includes a plurality of lower control devices to which the first power device is connected, and a management device that manages the plurality of lower control devices,
The management device calculates a lower target power based on the control command value, and calculates a lower control command value for each of the plurality of lower control devices based on the calculated lower target power,
Each of the plurality of lower-order control devices controls the first output power of the connected first power device based on the lower-order control command value calculated by the comprehensive control device. 2. The power system according to 2. There are a plurality of first power control devices,
The control command value is a guidance command value having a common value in each of the plurality of first power control devices,
Each of the plurality of first power control devices calculates a target value of the first output power using the received guidance command value, and controls the first output power to reach the target value. The power system according to claim 1 or claim 2.

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