JP2024001521A - Power management system, power conversion system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfy the principle of same time same amount of electricity with high quality.

SOLUTION: A power conversion system (10) can control so that the tidal current values between a distributed power system (1) and a distribution panel (3) to which a load (4) is connected, and a transmission and distribution network (2) are at set values. When power is exchanged between the plurality of distributed power generation systems (1) via the transmission and distribution network (2), a notification unit of a power management system (50) notifies a power conversion system (10a) on the power transmission side of the tidal current value setting value on the power transmission side, and notifies a power conversion system (10b) on the power receiving side of the tidal current value setting value on the power receiving side so that the power released from a power distribution board (3a) on the power transmission side to the power transmission and distribution network (2) corresponds to the power that a power distribution board (3b) on the power receiving side draws from the power transmission and distribution network (2).

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present disclosure relates to a power management system and a power conversion system that manage power interchange between a plurality of distributed power supply systems.

In Japan, the spread of solar power generation systems is expanding due to the Feed-in Tariff (FIT) system for renewable energy. With the end of the feed-in tariff system after November 2019 and the annual decline in unit purchase prices, P2P (Peer to Peer) transactions between individuals are attracting attention.

The principle of simultaneous and equal amounts is required to maintain the stability of the power system. Since the power generated by solar cells changes from moment to moment due to fluctuations in solar radiation, it is difficult to satisfy the principle of equal amount of electricity at the same time.

As a method of accommodating the amount of electricity that has been purchased and sold in P2P transactions, a possible control method is to discharge the sold electricity from the storage battery of the seller's electricity consumer and charge the purchased electricity into the buyer's electricity consumer's storage battery (for example, (See Patent Document 1).

JP2019-097375A

If the self-consumption of the load changes significantly or the power generated by the solar cells changes significantly during the period when the seller's electricity consumer is discharging from the storage battery according to the contracted amount of electricity, a reverse power flow may occur in the power grid. The power applied may vary greatly. In addition, if the self-consumption of the load changes significantly or the power generated by the solar cells changes significantly during the period when the buyer's power consumer is charging the storage battery according to the contracted amount of power, the electric power system The power drawn may vary greatly.

The present disclosure has been made in view of these circumstances, and its purpose is to provide a power management system and a power conversion system that can satisfy the principle of simultaneous and equal amount in power interchange with high quality.

In order to solve the above problems, a power management system according to an aspect of the present disclosure is a power management system that manages power interchange between a plurality of distributed power generation systems connected to the same power transmission and distribution network, The type power supply system includes a power storage unit and a power conversion system. The power conversion system is capable of controlling a power flow value between the distribution board to which the distributed power supply system and the load are connected and the power transmission and distribution network to a set value, and the power management system is capable of controlling the power flow value between the power transmission and distribution network to a set value. When power is exchanged between multiple distributed power generation systems via a power transmission and distribution network, the power that is released from the power distribution board on the power transmission side to the power transmission and distribution network, and the power that is released from the power distribution board on the power transmission side to the power transmission and distribution system The set value of the power flow value on the power transmitting side is notified to the power conversion system on the power transmitting side, and the set value of the power flow value on the power receiving side is notified to the power conversion system on the power receiving side so that the power drawn from the network corresponds to the power flow value set on the power transmitting side. It is equipped with a notification section that notifies the user.

Note that arbitrary combinations of the above components and expressions of the present disclosure converted between devices, systems, methods, computer programs, etc. are also effective as aspects of the present disclosure.

According to the present disclosure, the principle of simultaneous and equal amount of power can be satisfied with high quality in power interchange.

FIG. 2 is a diagram for explaining a mechanism for power interchange between a plurality of distributed power supply systems. 1 is a diagram illustrating a configuration example of a power management system according to an embodiment. FIG. 2 is a diagram for explaining a specific example of a power conversion system on a power selling side and a power conversion system on a power buying side during a power interchange period according to an embodiment. 3 is a flowchart for explaining the basic operation regarding power trading of the power management system according to the embodiment. 2 is a timing chart for explaining an example 1 of operation during a power interchange period of a power conversion system on a power selling side, a power management system, and a power conversion system on a power buying side according to an embodiment. 12 is a timing chart for explaining an operation example 2 of the power selling side power conversion system, the power management system, and the power buying side power conversion system during the power interchange period according to the embodiment. 12 is a timing chart for explaining a third operation example during a power interchange period of a power conversion system on a power selling side, a power management system, and a power conversion system on a power buying side according to an embodiment. 12 is a timing chart for explaining an operation example 4 of the power selling side power conversion system, the power management system, and the power buying side power conversion system during the power interchange period according to the embodiment.

FIG. 1 is a diagram for explaining a mechanism for power interchange between a plurality of distributed power supply systems 1. As shown in FIG. The plurality of distributed power supply systems 1 are connected to a commercial power system 2 (hereinafter simply referred to as system 2), and power interchange between the plurality of distributed power supply systems 1 is implemented via the system 2. Hereinafter, in this embodiment, it is assumed that system 2 installed by a general power transmission and distribution company is used as the power transmission and distribution network. Note that when a plurality of distributed power supply systems 1 constitute a microgrid connected by private lines, power interchange is performed using the private lines as a power transmission and distribution network.

The distributed power supply system 1 includes a solar cell 20, an on-vehicle storage battery 30, and a power conversion system 10. The power conversion system 10 is an integrated power conversion system (also referred to as a power station (registered trademark)) that integrates a power conditioner function for the solar cell 20 and a power conditioner function for the in-vehicle storage battery 30. be. The power conversion system 10 includes a first DC/DC converter 11, a second DC/DC converter 13, an inverter 12, and a control unit 15 as main components.

The solar cell 20 can directly convert light energy into DC power using the photovoltaic effect. As the solar cell 20, a heterojunction solar cell, a polycrystalline silicon solar cell, a single crystal silicon solar cell, a thin film silicon solar cell, a compound solar cell, etc. can be used.

The solar cell 20 is connected to the first DC/DC converter 11 and outputs the generated power to the first DC/DC converter 11 . The first DC/DC converter 11 is a converter that is connected between the solar cell 20 and the DC bus Bd and is capable of adjusting the voltage of the DC power output from the solar cell 20. The first DC/DC converter 11 can be configured with a step-up chopper, for example.

The on-vehicle storage battery 30 is a drive storage battery mounted on an electric vehicle, and uses a lithium ion storage battery, a nickel metal hydride storage battery, or the like. The electric vehicle and the power conversion system 10 are connected by a charging cable. The on-vehicle storage battery 30 is connected to the second DC/DC converter 13 when the electric vehicle is parked at home, and charge and discharge are controlled by the second DC/DC converter 13. The second DC/DC converter 13 is a bidirectional DC/DC converter that is connected between the on-board storage battery 30 and the DC bus Bd, and charges and discharges the on-board storage battery 30 when the electric vehicle is parked at home. Note that the second DC/DC converter 13 may be configured with an external V2H converter.

Note that instead of the on-vehicle storage battery 30, a configuration in which a stationary storage battery is connected to the power conversion system 10 may be used. The in-vehicle or stationary storage battery may be replaced with a capacitor such as an electric double layer capacitor or a lithium ion capacitor. In this specification, the storage battery and the capacitor are collectively referred to as a power storage unit.

Inverter 12 is connected between DC bus Bd and distribution board 3. A first DC/DC converter 11 and a second DC/DC converter 13 are connected in parallel to the DC bus Bd. The inverter 12 converts the DC power supplied via the DC bus Bd from at least one of the first DC/DC converter 11 and the second DC/DC converter 13 into AC power, and outputs the converted AC power to the distribution board 3. do. At this time, the inverter 12 can control the voltage or current of the output AC power.

The inverter 12 can also convert AC power supplied from the system 2 via the distribution board 3 into DC power, and output the converted DC power to the second DC/DC converter 13 . The distribution board 3 serves as a power receiving point N for the system 2. A distributed power supply system 1 and an in-home load 4 are connected to the distribution board 3 . The home load 4 is a general term for loads installed inside the home.

The distribution board 3 includes a main breaker, a plurality of branch breakers, a main current sensor, a voltage sensor, a plurality of branch current sensors, and a measurement adapter. The master current sensor measures the tidal current flowing from the system 2 to the distribution board 3. Hereinafter, in this specification, the current flowing in the direction from the power distribution board 3 to the power distribution board 3 will be referred to as positive, and the current flowing in the direction from the power distribution board 3 to the power distribution board 2 will be referred to as negative.

The plurality of branch current sensors each measure the current flowing through each branch wiring. The measurement adapter collects data measured by the main current sensor, voltage sensor, and multiple branch current sensors. The measurement adapter calculates the tidal current power by multiplying the tidal current measured by the master current sensor and the voltage measured by the voltage sensor.

The measurement adapter is connected to the power conversion system 10 by wire or wirelessly. Further, the measurement adapter is connected to a home energy management system 5 by wire or wirelessly. Note that the measurement adapter may not be built into the distribution board 3, but may be attached externally. The power conversion system 10 is connected to the home energy management system 5 by wire or wirelessly.

The home energy management system 5 is installed in a customer's home, monitors the power supply situation and consumption situation in the home, and centrally manages the energy in the home. The home energy management system 5 can control the operating status of the home load 4 that has a cooperative function with the home energy management system 5. Examples of the household loads 4 whose operating status can be controlled include lighting, air conditioners, air purifiers, heat pump water heaters, IH cooking heaters, and the like. In order to increase the power consumption of the home load 4, the home energy management system 5 can, for example, start boiling a heat pump water heater. Furthermore, in order to reduce the power consumption of the indoor load 4, the home energy management system 5 can, for example, stop the heating of the heat pump water heater.

The home energy management system 5 is connected to an external network 6 (for example, the Internet, a leased line, or a VPN (Virtual Private Network)) via a router device (not shown). A power management system 50 is connected to the external network 6.

The in-home energy management system 5 can receive power sale orders or power purchase orders from users. For example, the amount of electricity is traded in units of 30 minutes. In the case of a power sales order, the power sales time period, the amount of power sold (〇〇kWh), and the power sales price (〇〇 yen) are specified. In the case of a power purchase order, the power purchase time period, power purchase amount (〇〇kWh), and power purchase price (〇〇 yen) are specified. The user can operate the monitor of the home energy management system 5 to input a power sale order or a power purchase order. Further, the user may operate an information terminal (for example, a PC, a tablet, or a smartphone) connected to the home energy management system 5 by wire or wirelessly to input a power sale order or a power purchase order.

Note that the power selling order or the power purchasing order may be automatically issued by the power trading agent installed in the home energy management system 5 or the information terminal. The power trading agent predicts future power demand by machine learning based on measured data such as the amount of power generated by the solar cell 20, the SOC and charge/discharge amount of the on-board storage battery 30, and the amount of power consumed by the in-home load 4. Based on the predicted power demand, the power trading agent issues power sales orders during times when there is a surplus of power, and issues power purchase orders during times when there is a power shortage.

The home energy management system 5 transmits a power sale order or a power purchase order to the power management system 50 via the external network 6. The home energy management system 5 also receives a contract notification from the power management system 50. The execution notification of the power selling order includes at least the power selling time period and the setting value of the power flow power (hereinafter referred to as the power flow setting value). In the case of a power sale order, the power flow setting value will be a negative value. The execution notification of the power purchase order includes at least the power purchase time period and the power flow setting value. In the case of a power purchase order, the power flow setting value is a positive value. The home energy management system 5 transmits the power selling time period or the power purchasing time period and the power flow setting value received from the power management system 50 to the power conversion system 10.

The control unit 15 comprehensively controls the entire power conversion system 10. The control unit 15 can be realized by cooperation of hardware resources and software resources, or by only hardware resources. Analog elements, microcontrollers, DSPs, ROMs, RAMs, ASICs (Application Specific Integrated Circuits), FPGAs (Field Programmable Gate Arrays), and other LSIs can be used as hardware resources. Programs such as firmware can be used as software resources.

The control unit 15 can perform MPPT (Maximum Power Point Tracking) control of the solar cell 20 by controlling the first DC/DC converter 11 . Specifically, the control unit 15 measures the input voltage and input current of the first DC/DC converter 11a, which are the output voltage and output current of the solar cell 20, and estimates the power generated by the solar cell 20. The control unit 15 generates a voltage command value for bringing the generated power of the solar cell 20 to the maximum power point (optimum operating point) based on the measured output voltage of the solar cell 20 and the estimated generated power. For example, the control unit 15 searches for the maximum power point by changing the operating point voltage in a predetermined step width according to the hill-climbing method, and generates a voltage command value so as to maintain the maximum power point. The first DC/DC converter 11 performs a switching operation according to a drive signal based on the generated voltage command value.

The control unit 15 can control the second DC/DC converter 13 to control charging and discharging of the on-vehicle storage battery 30. The control unit 15 can communicate with a BMU (Battery Management Unit) of the in-vehicle storage battery 30 via a communication line in the charging cable. In the case of CHAdeMO (registered trademark), it is connected via CAN (Controller Area Network). The second DC/DC converter 13 performs constant current (CC) discharging, constant voltage (CV) discharging, constant Perform current charging or constant voltage charging.

The control unit 15 can control the inverter 12 so that the voltage of the DC bus Bd maintains the target value. Specifically, the control unit 15 measures the voltage of the DC bus Bd and generates a current command value for making the measured bus voltage match the target value. The control unit 15 generates a current command value for increasing the output power of the inverter 12 when the voltage of the DC bus Bd is higher than the target value, and generates a current command value for increasing the output power of the inverter 12 when the voltage of the DC bus Bd is lower than the target value. Generates a current command value to lower the current. The inverter 12 performs a switching operation according to a drive signal based on the generated current command value.

The control unit 15 can acquire the remaining capacity (SOC: State of Charge) of the on-board storage battery 30 from the BMU of the on-board storage battery 30 . Further, the control unit 15 can acquire the power generated by the solar cell 20 from the solar cell 20 . Further, the control unit 15 can acquire the tidal power Pd of the power receiving point N and the power consumption of the household load 4 from the distribution board 3 .

The control unit 15 controls the charging and discharging of the on-vehicle storage battery 30, the power generation suppression control of the solar cell 20, and the control of the in-home load 4 during a period in which power interchange is implemented according to power trading (hereinafter referred to as the power interchange period). At least one of the power consumption controls is executed to control the tidal power Pd at the power receiving point N to maintain the offset command value. The offset command value is set based on the power flow setting value of the power receiving point N received from the power management system 50. Details of the offset command value will be described later.

The control unit 15 can control the charging and discharging of the on-vehicle storage battery 30 by controlling the second DC/DC converter 13 . Further, the control unit 15 can perform power generation suppression control of the solar cell 20 by controlling the first DC/DC converter 11 . Further, the control unit 15 can control the power consumption of the home load 4 via the home energy management system 5.

FIG. 2 is a diagram showing a configuration example of the power management system 50 according to the embodiment. The power management system 50 is constructed on an in-house server installed in the company's own facility or data center of a business that provides power trading services, or on a cloud server used based on a cloud service contract. The power management system 50 may be constructed on a plurality of servers distributed and installed at a plurality of bases (data centers, company facilities). The plurality of servers may be a combination of a plurality of in-house servers, a plurality of cloud servers, or a combination of an in-house server and a cloud server.

The power management system 50 includes a processing section 51, a storage section 52, and a communication section 53. The communication unit 53 is a communication interface (for example, NIC: Network Interface Card) for connecting to the external network 6 by wire or wirelessly.

The processing unit 51 includes an order acquisition unit 511, a contract unit 512, a notification unit 513, a storage battery information acquisition unit 514, and a setting value change unit 515. The functions of the processing unit 51 can be realized by cooperation of hardware resources and software resources, or by only hardware resources. As hardware resources, a CPU, ROM, RAM, GPU (Graphics Processing Unit), ASIC, FPGA, and other LSIs can be used. Programs such as operating systems and applications can be used as software resources.

The storage unit 52 includes a nonvolatile recording medium such as an HDD or an SSD, and stores various data. In this embodiment, power transaction history is mainly stored.

The order acquisition unit 511 receives multiple power sales orders and multiple power purchase orders from the energy management systems of multiple households or businesses that own the distributed power supply system 1 connected to the grid 2 via the external network 6. get. In this embodiment, households that are eligible to participate in bidding for power trading are households that own storage batteries. Therefore, even households that do not own power generation equipment such as solar cells can bid for power purchase transactions. Note that bidding for electricity sales transactions is basically not possible. The participation qualifications of businesses may be the same as those of households, or may be determined individually with power trading service providers.

The execution unit 512 matches a plurality of power sale orders and a plurality of power purchase orders using a predetermined algorithm for each time period to be traded, and contracts the power trade. The execution unit 512 basically executes orders in which the electricity selling price and the electricity purchasing price match. The execution unit 512 can also execute a transaction with a ratio of 1:N bidders. For example, a power sale order that is the sum of household A's power sale order (1.5kWh) and household B's power sale order (1.5kWh) and household C's power purchase order (3.0kWh) can be executed. .

The contract unit 512 sets a power flow setting value on the power selling side and a power flow setting value on the power buying side according to the contracted amount of power. For example, if 3.0 kWh is contracted as the amount of electricity for 30 minutes, the contract unit 512 sets the power flow setting value on the power selling side to -1.5 kW and the power flow setting value on the power buying side to +1.5 kW. Note that when there are two power selling entities, the execution unit 512 sets the power flow setting value of each power selling entity to −0.75 kW.

In this way, the contracting unit 512 determines, for each power transaction, that the power to be released from the distribution board 3 of the household or business operator on the power transmission side to the grid 2 and the distribution board 3 of the household or business operator on the power receiving side to be released into the grid 2. The power flow setting value on the power selling side and the power flow setting value on the power buying side are determined so that the power drawn from the power source corresponds to each other (in this embodiment, the two are matched).

The notification unit 513 notifies the energy management system of the household or business that issued the power sale order or power purchase order of the contract result. The notification unit 513 notifies the energy management system of the household or business whose power sale order or power purchase order was not completed of the contract result of the order failure. The notification unit 513 notifies the energy management system of the household or business where the power sale order or power purchase order has been established of the contract result including at least the time period of the power sale or power purchase and the power flow setting value.

The storage battery information acquisition unit 514 acquires storage battery information from the power conversion system 10 of the distributed power supply system 1 that is currently accommodating power via the home energy management system 5 during the power accommodating period.

The control unit 15 of the power conversion system 10 on the power selling side (power transmitting side) controls the remaining capacity that can be discharged from the on-vehicle storage battery 30 according to the first regulation during the power selling period (reverse power flow period) during which power is being released to the grid 2. If the value falls below the value, the storage battery information is notified to the power management system 50 via the home energy management system 5. The control unit 15 includes the current remaining capacity of the on-vehicle storage battery 30 in the storage battery information. Furthermore, the control unit 15 may include the current power generation of the solar cell 20 and the power consumption of the household load 4 in the storage battery information.

For example, the first specified value may be set to a power amount corresponding to a predetermined discharge-side SOC (for example, 90%). Further, the first specified value may be set to the contracted amount of power. In addition, in the case where the first specified value is set to the contracted amount of power, if the power generated by the solar cell 20 is larger than the power consumption of the in-home load 4, the control unit 15 notifies the power management system 50 of the storage battery information. may be omitted.

The setting value changing unit 515 decreases the power flow setting value on the power selling side and the power flow setting value on the power buying side according to the storage battery information acquired by the storage battery information acquisition unit 514. When the first specified value is set to a power amount corresponding to a predetermined discharge-side SOC, the set value changing unit 515 changes the power value to the power value obtained by dividing the remaining capacity of the on-vehicle storage battery 30 by the remaining time of the power interchange period, for example. Change the power flow setting value on the power selling side. Note that the power value may be changed to a power value obtained by subtracting a predetermined margin from the power value.

The setting value changing unit 515 changes the sales value to the electric power value obtained by dividing {remaining capacity of the on-vehicle storage battery 30 + (power generated by the solar cell 20 x remaining time) - (power consumption of the household load 4 x remaining time)} by the remaining time. The power flow setting value on the power side may be changed. Note that the power value may be changed to a power value obtained by subtracting a predetermined margin from the power value.

The setting value changing unit 515 changes the power flow setting value on the power buying side in accordance with the change in the power flow setting value on the power selling side. Specifically, the setting value changing unit 515 decreases the power flow setting value on the power buying side by the same amount in absolute value as the power flow setting value on the power selling side.

When the first specified value is set to the contracted power amount, the set value changing unit 515 reduces the power flow setting value on the power selling side and the power flow setting value on the power purchasing side to half each, for example. Note that the reduction range of the power flow setting value on the power selling side and the power flow setting value on the power buying side may be set to be smaller as the remaining time of the power interchange period is shorter.

The notification unit 154 notifies the power conversion system 10 on the power selling side of the changed power flow setting value on the power selling side, and notifies the power conversion system 10 on the power purchasing side of the changed power flow setting value on the power purchasing side. .

The control unit 15 of the power conversion system 10 on the power purchasing side (power receiving side) determines that the chargeable free capacity of the on-board storage battery 30 is a second specified value during the power purchasing period (forward flow period) during which power is being drawn in from the grid 2. If the value falls below , the storage battery information is notified to the power management system 50 via the home energy management system 5. The control unit 15 includes the current free capacity of the on-vehicle storage battery 30 in the storage battery information. Furthermore, the control unit 15 may include the current power generation of the solar cell 20 and the power consumption of the household load 4 in the storage battery information.

For example, the second specified value may be set to a power amount corresponding to a predetermined charging side SOC (for example, 10%). Further, the second specified value may be set to the contracted amount of power. Note that when the second specified value is set to the contracted amount of power, if the power generated by the solar cell 20 is smaller than the power consumption of the in-home load 4, the control unit 15 notifies the power management system 50 of the storage battery information. may be omitted.

The setting value changing unit 515 decreases the power flow setting value on the power selling side and the power flow setting value on the power buying side according to the storage battery information acquired by the storage battery information acquisition unit 514. When the second specified value is set to a power amount corresponding to a predetermined charging side SOC, the set value changing unit 515 sets the power value to be the power value obtained by dividing the free capacity of the on-board storage battery 30 by the remaining time of the power interchange period, for example. Change the power flow setting value on the power purchase side. Note that the power value may be changed to a power value obtained by subtracting a predetermined margin from the power value.

The set value changing unit 515 changes the purchase amount to the power value obtained by dividing {free capacity of the on-vehicle storage battery 30 - (power generated by the solar cell 20 x remaining time) + (power consumption of the household load 4 x remaining time)} by the remaining time. The power flow setting value on the power side may be changed. Note that the power value may be changed to a power value obtained by subtracting a predetermined margin from the power value.

The setting value changing unit 515 changes the power flow setting value on the power selling side in accordance with the change in the power flow setting value on the power buying side. Specifically, the setting value changing unit 515 decreases the power flow setting value on the power selling side by the same amount in absolute value as the power flow setting value on the power buying side.

When the second specified value is set to the contracted power amount, the set value changing unit 515 reduces the power flow setting value on the power buying side and the power flow setting value on the power selling side to half each, for example. Note that the reduction range of the power flow setting value on the power buying side and the power flow setting value on the power selling side may be set to be smaller as the remaining time of the power interchange period is shorter.

The notification unit 154 notifies the power conversion system 10 on the power purchase side of the changed power flow setting value on the power purchase side, and notifies the power conversion system 10 on the power selling side of the changed power flow setting value on the power sales side. .

The control unit 15 of the power conversion system 10 on the power selling side controls the in-home energy management system 5 if the discharged power from the on-vehicle storage battery 30 exceeds the third specified value during the power selling period when power is being released to the grid 2. The storage battery information is notified to the power management system 50 via. The control unit 15 includes the current discharge power from the on-vehicle storage battery 30 and the third specified value in the storage battery information.

The default value of the third specified value is set based on the discharge rated power of the second DC/DC converter 13. For example, when the discharge rated power of the second DC/DC converter 13 is 6.0 kW, it is set to 5.5 kW, which is obtained by subtracting a predetermined margin (for example, 0.5 kW) from 6.0 kW.

The control unit 15 specifies the maximum discharge rate of the in-vehicle storage battery 30 by referring to a table that describes the relationship between the SOC and the maximum discharge rate. The maximum discharge rate for each SOC of the on-board storage battery 30 differs depending on the type and capacity of the on-board storage battery 30. The designer prepares the above table in advance according to the in-vehicle storage battery 30 to be used. The maximum discharge rate of the on-vehicle storage battery 30 is 0W when SOC=0%. As the SOC increases, the maximum discharge rate increases. For simplicity, in the range of SOC=2-100%, the maximum discharge rate may be fixed to the discharge rated power of the on-vehicle storage battery 30. When the absolute value of the maximum discharge rate is larger than the default value of the third specified value, the control unit 15 changes the third specified value to the absolute value of the maximum discharge rate.

The setting value changing unit 515 changes the power flow setting value on the power selling side to the third specified value based on the storage battery information received from the power conversion system 10 on the power selling side. Note that the power value may be changed to a value obtained by subtracting a predetermined margin from the third specified value. The setting value changing unit 515 changes the power flow setting value on the power buying side in accordance with the change in the power flow setting value on the power selling side. The notification unit 154 notifies the power conversion system 10 on the power selling side of the changed power flow setting value on the power selling side, and notifies the power conversion system 10 on the power purchasing side of the changed power flow setting value on the power purchasing side. .

The control unit 15 of the power conversion system 10 on the power purchase side controls the in-home energy management system 5 if the power charged to the on-board storage battery 30 exceeds the fourth specified value during the power purchase period when power is being drawn from the grid 2. The storage battery information is notified to the power management system 50 via the power management system 50. The control unit 15 includes the current charging power to the on-vehicle storage battery 30 and the fourth specified value in the storage battery information.

The default value of the fourth specified value is set based on the charging rated power of the second DC/DC converter 13. For example, when the charging rated power of the second DC/DC converter 13 is 6.0 kW, it is set to 5.5 kW, which is obtained by subtracting a predetermined margin (for example, 0.5 kW) from 6.0 kW.

The control unit 15 specifies the maximum charging rate of the in-vehicle storage battery 30 by referring to a table that describes the relationship between the SOC and the maximum charging rate. The maximum charging rate for each SOC of the on-board storage battery 30 differs depending on the type and capacity of the on-board storage battery 30. The designer prepares the above table in advance according to the in-vehicle storage battery 30 to be used. The maximum charging rate of the on-vehicle storage battery 30 is 0W when SOC=100%. As the SOC decreases, the maximum charging rate increases. For simplicity, in the range of SOC=98-0%, the maximum charging rate may be fixed to the charging rated power of the on-board storage battery 30. When the absolute value of the maximum charging rate is larger than the default value of the fourth specified value, the control unit 15 changes the fourth specified value to the absolute value of the maximum charging rate.

The setting value changing unit 515 changes the power flow setting value on the power purchasing side to the fourth specified value based on the storage battery information received from the power conversion system 10 on the power purchasing side. Note that the power value may be changed to a value obtained by subtracting a predetermined margin from the fourth specified value. The setting value changing unit 515 changes the power flow setting value on the power selling side in accordance with the change in the power flow setting value on the power buying side. The notification unit 154 notifies the power conversion system 10 on the power purchase side of the changed power flow setting value on the power purchase side, and notifies the power conversion system 10 on the power selling side of the changed power flow setting value on the power sales side. .

FIG. 3 is a diagram for explaining a specific example of the power conversion system 10a on the power selling side and the power conversion system 10b on the power purchasing side during the power interchange period according to the embodiment. In this embodiment, power conversion system 10 is operated in offset setting mode during the power interchange period. The offset setting mode is a mode in which the on-vehicle storage battery 30 is charged and discharged so that the tidal power Pd maintains the offset command value (other than 0 W). The power flow setting value notified from the power management system 50 is used as the offset command value.

In the environment priority mode of the power conversion system 10, load following control using the on-vehicle storage battery 30 is performed so that the tidal power Pd becomes 0W. When the solar cell 20 is not generating power, the control unit 15 controls the discharge power from the vehicle storage battery 30 so that the discharge power from the vehicle storage battery 30 and the power consumption of the in-home load 4 are equal. When the discharge power from the on-vehicle storage battery 30 and the power consumption of the in-home load 4 become equal, the tidal power Pd becomes 0W. In the state where the solar cell 20 is generating power, the control unit 15 controls the charging of the on-board storage battery 30 so that (power generated by the solar cell 20 + charging/discharging power of the on-board storage battery 30) and power consumption of the in-home load 4 are equal. Control discharge power. When (power generated by the solar cell 20 + charging/discharging power of the on-vehicle storage battery 30) and power consumption of the in-home load 4 become equal, the tidal power Pd becomes 0W.

On the other hand, in the offset setting mode, load follow-up control using the on-vehicle storage battery 30 is performed so that the tidal power Pd becomes the offset command value (other than 0 W). The following explanation assumes the power selling side. When the solar cell 20 is not generating power, the control unit 15 controls the discharge power from the on-vehicle storage battery 30 so that the discharge power from the on-board storage battery 30 is equal to (power consumption of the in-home load 4 + | tidal power |) control. When the difference between the discharge power from the on-vehicle storage battery 30 and the power consumption of the in-home load 4 becomes equal to |offset setting value|, the tidal power becomes equal to the offset command value. In the state where the solar cell 20 is generating power, the control unit 15 adjusts the power so that (power generated by the solar cell 20 + charging/discharging power of the on-board storage battery 30) and (power consumption of the in-home load 4 + | tidal power |) are equal. Then, the charging/discharging power of the on-vehicle storage battery 30 is controlled. When the difference between (power generated by the solar cell 20 + charging/discharging power of the on-board storage battery 30) and power consumption of the in-home load 4 becomes equal to |offset setting value|, the tidal power becomes equal to the offset command value.

In the example shown in FIG. 3, the offset setting value on the power selling side is set to −3.0 kW, and the offset setting value on the power purchasing side is set to +3.0 kW. For example, when the power generated by the solar cell 20a on the power selling side decreases from 1.5 kW to 1.0 kW due to solar radiation fluctuations, the discharge power of the in-vehicle storage battery 30a on the power selling side is increased from 4.0 kW to 4.5 kW. On the other hand, when the power generated by the solar cell 20a on the power selling side increases from 1.5 kW to 2.0 kW due to solar radiation fluctuations, the discharge power of the in-vehicle storage battery 30a on the power selling side is reduced from 4.0 kW to 3.5 kW. . For example, when the power consumption of the in-home load 4a on the power selling side decreases from 2.5 kW to 2.0 kW due to load fluctuation, the discharge power of the on-vehicle storage battery 30a on the power selling side is decreased from 4.0 kW to 3.5 kW. On the other hand, if the power consumption of the in-home load 4a on the power selling side increases from 2.5 kW to 3.0 kW due to load fluctuation, the discharge power of the on-board storage battery 30a on the power selling side is increased from 4.0 kW to 4.5 kW. . Through the above control, the offset setting value on the power selling side is maintained at -3.0kW.

Note that in a case where the discharge power from the on-vehicle storage battery 30a cannot be increased due to a restriction on the remaining capacity of the on-board storage battery 30a, if it is possible to reduce the power consumption of the in-home load 4a, the control unit 15 Reduce power consumption. When it is impossible to control the reduction in the power consumption of the indoor load 4a, or when it is not possible to maintain the tidal power at the offset command value only by controlling the reduction in the power consumption of the indoor load 4a, the control unit 15 suppresses the power generated by the solar cell 20a. let Since the power generation suppression control of the solar cell 20a is a control that wastes energy, it is given the lowest priority among the controls for maintaining the tidal power at the offset command value.

For example, when the power generated by the solar cell 20b on the power purchasing side decreases from 1.5 kW to 1.0 kW due to solar radiation fluctuations, the charging power of the on-vehicle storage battery 30b on the power purchasing side is decreased from 3.0 kW to 2.5 kW. On the other hand, when the power generated by the solar cell 20b on the power purchasing side increases from 1.5 kW to 2.0 kW due to solar radiation fluctuations, the charging power of the on-board storage battery 30b on the power purchasing side is increased from 3.0 kW to 3.5 kW. . For example, when the power consumption of the in-home load 4b on the power purchasing side decreases from 1.5 kW to 1.0 kW due to load fluctuation, the charging power of the on-board storage battery 30b on the power purchasing side is increased from 3.0 kW to 3.5 kW. On the other hand, if the power consumption of the in-home load 4b on the power purchasing side increases from 1.5 kW to 2.0 kW due to load fluctuation, the charging power of the on-board storage battery 30b on the power purchasing side is reduced from 3.0 kW to 2.5 kW. . Through the above control, the offset setting value on the power purchasing side is maintained at 3.0 kW.

Note that in a case where it is not possible to increase the charging power to the on-board storage battery 30b due to a constraint on the free capacity of the on-board storage battery 30b, and when it is possible to increase the power consumption of the in-home load 4b, the control unit 15 Increases power consumption. For example, a heat pump water heater starts boiling. If it is impossible to control the increase in the power consumption of the indoor load 4b, or if the tidal power cannot be maintained at the offset command value only by controlling the increase in the power consumption of the indoor load 4b, the control unit 15 suppresses the power generated by the solar cell 20b. let

FIG. 4 is a flowchart for explaining the basic operation regarding power trading of the power management system 50 according to the embodiment. The order acquisition unit 511 acquires a plurality of power sales orders and a plurality of power purchase orders from the energy management systems of a plurality of households or businesses that each have a distributed power supply system 1 (S1). The execution unit 512 matches a plurality of power sales orders and a plurality of power purchase orders for each time period to be traded, and contracts the power trade (S2). The contract unit 512 determines a power flow setting value on the power selling side and a power flow setting value on the power buying side according to the contracted amount of power (S3). The notification unit 513 notifies the electricity selling side power flow setting value to the electricity selling side power conversion system 10 (S4), and notifies the electricity buying side power flow setting value to the electricity buying side power conversion system 10 (S5). .

FIG. 5 is a timing chart for explaining operation example 1 of the power selling side power conversion system 10a, the power management system 50, and the power buying side power conversion system 10b during the power interchange period according to the embodiment. . The control unit 15a of the power conversion system 10a on the power selling side sets the power flow setting value on the power selling side received from the power management system 50 as an offset command value. With the start of the power selling period, the control unit 15a starts an offset operation such that the tidal power Pd at the power receiving point Na maintains the offset command value (S10). The offset operation continues (N in S11) until the power selling period ends (Y in S11).

The control unit 15b of the power conversion system 10b on the power purchase side sets the power flow setting value on the power purchase side received from the power management system 50 as an offset command value. With the start of the power purchase period, the control unit 15b starts an offset operation such that the tidal power Pd at the power receiving point Nb maintains the offset command value (S30). The offset operation is continued (N in S31) until the power purchase period ends (Y in S31).

When the remaining capacity that can be discharged from the on-vehicle storage battery 30a falls below the first specified value (Y in S12), the control unit 15a of the power conversion system 10a on the power selling side causes the power management system 50 to select a storage battery that includes the current remaining capacity. Information is notified (S13). The setting value changing unit 515 of the power management system 50 changes the power flow setting value on the power selling side and the power flow setting value on the power purchasing side according to the storage battery information received from the power conversion system 10a on the power selling side (S20). . The notification unit 154 of the power management system 50 notifies the power conversion system 10a of the power selling side of the changed power flow setting value on the power selling side, and transmits the changed power flow setting value of the power purchasing side to the power conversion system 10a of the power buying side. The system 10b is notified (S21).

The control unit 15a of the power conversion system 10a on the power selling side sets the changed power flow setting value on the power selling side received from the power management system 50 as a new offset command value (S14). The process moves to step S11. The control unit 15b of the power conversion system 10b on the power purchase side sets the changed power flow setting value on the power purchase side received from the power management system 50 as a new offset command value (S34). The process moves to step S31.

Note that during the period when the remaining capacity that can be discharged from the on-vehicle storage battery 30a is below the first specified value, the control unit 15a of the power conversion system 10a on the power selling side periodically (for example, every minute , at 5-minute intervals), or may be notified only once.

Note that if the relationship (power generation by solar cell 20a>power consumption by household load 4a) continues and the remaining capacity that can be discharged from the on-vehicle storage battery 30a recovers to the first specified value, the control unit 15a controls the power management system. 50 may be notified of storage battery information including the remaining capacity after recovery. In this case, the setting value changing unit 515 of the power management system 50 returns the power flow setting value on the power selling side and the power flow setting value on the power purchasing side to the initial values, and the notification unit 154 returns the changed power flow setting value on the power selling side. The value is notified to the power conversion system 10a on the power selling side, and the changed power flow setting value on the power purchasing side is notified to the power conversion system 10b on the power purchasing side.

Note that if the relationship (power generation of solar cell 20a<power consumption of household load 4a) continues and the remaining capacity that can be discharged from the on-board storage battery 30a reaches the lower discharge limit value, the control unit 15a controls the power management system 50. a message indicating that the lower discharge limit has been reached. In this case, the setting value changing unit 515 of the power management system 50 changes the power flow setting value on the power selling side and the power flow setting value on the power buying side to 0W, and the notification unit 154 changes the power flow setting value on the power selling side after the change. The value is notified to the power conversion system 10a on the power selling side, and the changed power flow setting value on the power purchasing side is notified to the power conversion system 10b on the power purchasing side.

In addition, the execution unit 512 determines that during the power interchange period to be traded, a period has occurred in which the power flow setting value on the power selling side and the power flow setting value on the power buying side are decreased from the power flow setting value corresponding to the contracted amount of power. In this case, the electricity sales price and electricity purchase price will be reduced according to the amount of decrease. In this case, a penalty fee may be imposed on the electricity selling side.

FIG. 6 is a timing chart for explaining operation example 2 of the power selling side power conversion system 10a, the power management system 50, and the power buying side power conversion system 10b during the power interchange period according to the embodiment. . Descriptions of processes common to operation example 1 shown in FIG. 5 will be omitted as appropriate.

When the chargeable free capacity of the on-vehicle storage battery 30b falls below the second specified value (Y in S32), the control unit 15b of the power conversion system 10b on the power purchase side selects a storage battery including the current free capacity in the power management system 50. Information is notified (S33). The setting value changing unit 515 of the power management system 50 changes the power flow setting value on the power selling side and the power flow setting value on the power purchasing side according to the storage battery information received from the power conversion system 10b on the power buying side (S20). . The following processing is common to operation example 1 shown in FIG.

Note that during a period when the chargeable free capacity of the on-board storage battery 30b is below the second specified value, the control unit 15b of the power conversion system 10b on the power purchase side periodically (for example, every 1 minute) , at 5-minute intervals), or may be notified only once.

Note that if the relationship (power generation by the solar cell 20b<power consumption by the household load 4b) continues and the chargeable free capacity of the on-board storage battery 30b recovers to the second specified value, the control unit 15b controls the power management system. 50 may be notified of storage battery information including the free capacity after recovery. In this case, the setting value changing unit 515 of the power management system 50 returns the power flow setting value on the power selling side and the power flow setting value on the power purchasing side to the initial values, and the notification unit 154 returns the changed power flow setting value on the power selling side. The value is notified to the power conversion system 10a on the power selling side, and the changed power flow setting value on the power purchasing side is notified to the power conversion system 10b on the power purchasing side.

Note that if the relationship (power generation by solar cell 20b>power consumption by household load 4b) continues and the available chargeable capacity of the on-board storage battery 30b reaches the charging upper limit, the control unit 15b controls the power management system 50. a message indicating that the charging limit has been reached. In this case, the setting value changing unit 515 of the power management system 50 changes the power flow setting value on the power selling side and the power flow setting value on the power buying side to 0W, and the notification unit 154 changes the power flow setting value on the power selling side after the change. The value is notified to the power conversion system 10a on the power selling side, and the changed power flow setting value on the power purchasing side is notified to the power conversion system 10b on the power purchasing side.

In addition, the execution unit 512 determines that during the power interchange period to be traded, a period has occurred in which the power flow setting value on the power selling side and the power flow setting value on the power buying side are decreased from the power flow setting value corresponding to the contracted amount of power. In this case, the electricity sales price and electricity purchase price will be reduced according to the amount of decrease. In this case, a penalty fee may be imposed on the power purchasing side.

FIG. 7 is a timing chart for explaining operation example 3 of the power selling side power conversion system 10a, the power management system 50, and the power buying side power conversion system 10b during the power interchange period according to the embodiment. . Descriptions of processes common to operation example 1 shown in FIG. 5 will be omitted as appropriate.

When the discharged power from the on-vehicle storage battery 30a exceeds the third specified value (Y in S12a), the control unit 15a of the power conversion system 10a on the power selling side sends the current discharged power and the third specified value to the power management system 50. (S13). The setting value changing unit 515 of the power management system 50 changes the power flow setting value on the power selling side and the power flow setting value on the power purchasing side according to the storage battery information received from the power conversion system 10a on the power selling side (S20). . The notification unit 154 of the power management system 50 notifies the power conversion system 10a of the power selling side of the changed power flow setting value on the power selling side, and transmits the changed power flow setting value of the power purchasing side to the power conversion system 10a of the power buying side. The system 10b is notified (S21).

The control unit 15a of the power conversion system 10a on the power selling side sets the changed power flow setting value on the power selling side received from the power management system 50 as a new offset command value (S14). The control unit 15a specifies the maximum discharge rate of the on-board storage battery 30a according to the SOC of the on-board storage battery 30a (S15). The control unit 15a compares the maximum discharge rate of the specified in-vehicle storage battery 30a with the default value of the third specified value (S16). When the maximum discharge rate is larger than the default value of the third specified value (Y of S16), the control unit 15a updates the third specified value to the value of the maximum discharge rate of the on-board storage battery 30a (S17). Note that the value may be updated to a value obtained by subtracting a predetermined margin from the maximum discharge rate of the on-vehicle storage battery 30a. If the maximum discharge rate is less than the third specified default value (N in S16), it is not changed from the default value. The process moves to step S11.

In addition, the execution unit 512 determines that during the power interchange period to be traded, a period has occurred in which the power flow setting value on the power selling side and the power flow setting value on the power buying side are decreased from the power flow setting value corresponding to the contracted amount of power. In this case, the electricity sales price and electricity purchase price will be reduced according to the amount of decrease. In this case, a penalty fee may be imposed on the electricity selling side.

FIG. 8 is a timing chart for explaining operation example 4 of the power selling side power conversion system 10a, the power management system 50, and the power buying side power conversion system 10b during the power interchange period according to the embodiment. . Descriptions of processes common to operation example 1 shown in FIG. 5 will be omitted as appropriate.

When the charging power to the in-vehicle storage battery 30b exceeds the fourth specified value (Y in S32a), the control unit 15b of the power conversion system 10b on the power purchasing side sends the current charging power and the fourth specified value to the power management system 50. The storage battery information including the storage battery information is notified (S33). The setting value changing unit 515 of the power management system 50 changes the power flow setting value on the power selling side and the power flow setting value on the power purchasing side according to the storage battery information received from the power conversion system 10b on the power buying side (S20). . The notification unit 154 of the power management system 50 notifies the power conversion system 10a of the power selling side of the changed power flow setting value on the power selling side, and transmits the changed power flow setting value of the power purchasing side to the power conversion system 10a of the power buying side. The system 10b is notified (S21).

The control unit 15b of the power conversion system 10b on the power purchase side sets the changed power flow setting value on the power purchase side received from the power management system 50 as a new offset command value (S34). The control unit 15b specifies the maximum charging rate of the on-board storage battery 30b according to the SOC of the on-board storage battery 30b (S35). The control unit 15b compares the maximum charging rate of the identified in-vehicle storage battery 30b with the default value of the fourth specified value (S36). When the maximum charging rate is larger than the default value of the fourth specified value (Y of S36), the control unit 15b updates the fourth specified value to the value of the maximum charging rate of the on-board storage battery 30b (S37). Note that the charging rate may be updated to a value obtained by subtracting a predetermined margin from the maximum charging rate of the on-vehicle storage battery 30b. If the maximum charging rate is less than the fourth specified default value (N in S36), it is not changed from the default value. The process moves to step S31.

In addition, the execution unit 512 determines that during the power interchange period to be traded, a period has occurred in which the power flow setting value on the power selling side and the power flow setting value on the power buying side are decreased from the power flow setting value corresponding to the contracted amount of power. In this case, the electricity sales price and electricity purchase price will be reduced according to the amount of decrease. In this case, a penalty fee may be imposed on the power purchasing side.

As described above, according to the present embodiment, the principle of simultaneous and equal amount of power can be satisfied with high quality in power interchange between the plurality of distributed power supply systems 1. In other words, by matching the power flow from power receiving point Na on the electricity selling side to grid 2 and the power flowing from grid 2 to power receiving point Nb on the power buying side, power interchange between distributed power generation systems 1 can be achieved. 2. It is possible to prevent surplus power or power shortage from occurring.

On the other hand, if the amount of discharge of the storage battery on the power selling side and the amount of charge of the storage battery on the power purchasing side are to be controlled, the change in the power generated by the solar cells or the power consumption of the load will cause grid 2 to Surplus power or power shortage may occur due to power interchange. That is, there may be a period in which the principle of simultaneous and equal amounts cannot be satisfied.

In contrast, in this embodiment, by controlling the tidal power at the power receiving point Na on the power selling side and the tidal power at the power receiving point Nb on the power buying side, the principle of simultaneous and equal amount is satisfied at each moment. be able to. Therefore, the influence on the grid 2 due to power interchange between the distributed power supply systems 1 can be minimized, and the stability of the grid 2 can be maintained.

In addition, when the remaining capacity of the on-board storage battery 30a on the power selling side is low, or when the free capacity of the on-board storage battery 30b on the power buying side is low, the power flow setting value is reduced to facilitate power interchange. It can be continued as long as possible.

In addition, the power flow setting value is decreased when the discharge power from the on-board storage battery 30a on the power selling side approaches the rated excess, or when the charging power to the on-board storage battery 30b on the power buying side approaches the rated excess. This allows power interchange to continue as much as possible.

The present disclosure has been described above based on the embodiments. It will be understood by those skilled in the art that the embodiments are illustrative, and that various modifications are possible to the combinations of each component and each treatment process, and that such modifications are also within the scope of the present disclosure. .

In the above embodiment, an example has been described in which the solar cell 20 is used as a power generation device that converts renewable energy into electrical energy. In this regard, instead of the solar cell 20, a wind power generator or a micro hydraulic power generator may be used. In this case, a rectifier is connected between the wind power generator or the micro-hydro power generator and the first DC/DC converter 11.

In the above embodiment, the power conversion system 10 to which the on-vehicle storage battery 30 or the stationary storage battery is connected has been described, but the power conversion system 10 to which both the on-vehicle storage battery 30 and the stationary storage battery are connected may be used. In that case, a DC/DC converter for the on-vehicle storage battery 30 and a DC-DC converter for the stationary storage battery are provided in parallel to the DC bus Bd. The control unit 15 can use the sum of the remaining capacity of the on-vehicle storage battery 30 and the remaining capacity of the stationary storage battery as the remaining capacity for offset operation when selling electricity. Further, the control unit 15 can use the sum of the free capacity of the on-vehicle storage battery 30 and the free capacity of the stationary storage battery as the free capacity for offset operation at the time of power purchase.

In the above embodiment, the control unit 15 controls the tidal power Pd at the power receiving point N to maintain the offset command value (power value), but the tidal current at the power receiving point N maintains the offset command value (current value). It may be controlled to do so.

In the above embodiment, power interchange between distributed power supply systems 1 due to power trading has been explained. In this respect, the offset according to the present embodiment can also be used for power interchange without the exchange of money, for the purpose of effective utilization of solar cells 20 and effective utilization of storage batteries between a plurality of distributed power supply systems 1 forming one group. Driving can be used.

The main body of the system or method in the present disclosure includes a computer. When this computer executes the program, the main function of the system or method in the present disclosure is realized. A computer includes, as its main hardware configuration, a processor that operates according to a program. The type of processor does not matter as long as it can implement a function by executing a program. A processor is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large scale integration (LSI). Here, they are called IC or LSI, but the name changes depending on the degree of integration, and may also be called system LSI, VLSI (very large scale integration), or ULSI (ultra large scale integration). Field programmable gate arrays (FPGAs), which are programmed after the LSI is manufactured, or reconfigurable logic devices that can reconfigure the interconnections within the LSI or set up circuit sections within the LSI, may also be used for the same purpose. I can do it. A plurality of electronic circuits may be integrated on one chip or may be provided on a plurality of chips. A plurality of chips may be integrated into one device, or may be provided in a plurality of devices. The program is recorded on a computer-readable non-transitory storage medium such as a ROM, optical disk, or hard disk drive. The program may be stored in the recording medium in advance, or may be supplied to the recording medium via a wide area communication network including the Internet.

Note that the embodiment may be specified by the following items.

[Item 1]
A power management system (50) that manages power interchange between a plurality of distributed power supply systems (1) connected to the same power transmission and distribution network (2),
Each distributed power supply system (1) has a power storage unit (30) and a power conversion system (10),
The power conversion system (10) is configured such that a power flow value between the distribution board (3) to which the distributed power supply system (1) and the load (4) are connected and the power transmission and distribution network (2) is a set value. can be controlled so that
The power management system (50) includes:
When power is exchanged between a plurality of distributed power generation systems (1) via the power transmission and distribution network (2), electric power is released from the distribution board (3) on the power transmission side to the power transmission and distribution network (2). The set value of the power flow value on the power transmission side is changed to the power flow value setting value on the power transmission side so that the power drawn by the power distribution board (3) on the power reception side from the power transmission and distribution network (2) corresponds to the power flow value set in the power conversion system (10) on the power transmission side. and a notification unit (513) that notifies the power flow value setting value on the power receiving side to the power conversion system (10) on the power receiving side.
Power management system (50).
According to this, in the power interchange between the plurality of distributed power supply systems (1), the principle of simultaneous and equal amount of power can be satisfied from moment to moment.
[Item 2]
At least one of the plurality of distributed power supply systems (1) includes a power generation device (20) that converts renewable energy into electrical energy,
The power conversion system (10) performs at least one of charging and discharging control of the power storage unit (30), power generation suppression control of the power generation device (20), and power consumption control of the load (4), controlling the tidal flow value to the set value;
The power management system (50) according to item 1.
According to this, the power flow value can be maintained at the set value regardless of changes in the generated power or changes in the power consumption of the load (4).
[Item 3]
Acquire power storage unit information notified from the power conversion system (10) on the power transmission side when the remaining capacity that can be discharged from the power storage unit (30) of the distributed power supply system (1) on the power transmission side falls below a specified value. an information acquisition unit (514) to
Further comprising a set value changing unit (515) that reduces the set value of the power flow value on the power transmission side and the set value of the power flow value on the power receiving side according to the acquired power storage unit information,
The notification unit (513) notifies the power conversion system (10) on the power transmission side and the power conversion system (10) on the power reception side of the changed setting value.
The power management system (50) according to item 1 or 2.
According to this, even when the remaining capacity of the electricity storage unit (30) on the power transmission side is running low, power interchange can be continued as much as possible.
[Item 4]
Acquire power storage unit information notified from the power conversion system (10) on the power receiving side when the available chargeable capacity of the power storage unit (30) of the distributed power supply system (1) on the power receiving side falls below a specified value. an information acquisition unit (514) to
Further comprising a set value changing unit (515) that reduces the set value of the power flow value on the power transmission side and the set value of the power flow value on the power receiving side according to the acquired power storage unit information,
The notification unit (513) notifies the power transmission side power conversion system (10) and the power reception side power conversion system (10) of the changed setting value.
The power management system (50) according to item 1 or 2.
According to this, even when the free capacity of the power storage unit (30) on the power receiving side is running low, power interchange can be continued as much as possible.
[Item 5]
Storage power that is notified from the power conversion system (10) on the power transmission side when the discharge power from the power storage unit (30) of the distributed power supply system (1) on the power transmission side exceeds a specified value based on the discharge rated power. an information acquisition unit (514) that acquires department information;
Further comprising a set value changing unit (515) that reduces the set value of the power flow value on the power transmission side and the set value of the power flow value on the power receiving side according to the acquired power storage unit information,
The notification unit (513) notifies the power transmission side power conversion system (10) and the power reception side power conversion system (10) of the changed setting value.
The power management system (50) according to item 1 or 2.
According to this, even when the discharged power from the power storage unit (30) on the power transmission side is approaching the rated exceedance, power interchange can be continued as much as possible.
[Item 6]
Energy storage that is notified from the power conversion system (10) on the power receiving side when the charging power to the power storage unit (30) of the distributed power supply system (1) on the power receiving side exceeds a specified value based on the charging rated power. an information acquisition unit (514) that acquires department information;
Further comprising a set value changing unit (515) that reduces the set value of the power flow value on the power transmission side and the set value of the power flow value on the power receiving side according to the acquired power storage unit information,
The notification unit (513) notifies the power transmission side power conversion system (10) and the power reception side power conversion system (10) of the changed setting value.
The power management system (50) according to item 1 or 2.
According to this, even when the charging power to the power storage unit (30) on the power receiving side approaches the rated overload, power interchange can be continued as much as possible.
[Item 7]
A power conversion system (10) included in a distributed power supply system (1) having a power storage unit (30),
A control unit ( 15),
The control unit (15) includes:
When power is exchanged between a plurality of distributed power generation systems (1) via the power transmission and distribution network (2), electric power is released from the distribution board (3) on the power transmission side to the power transmission and distribution network (2). The set value of the power flow value on the power transmission side is changed to the power flow value setting value on the power transmission side so that the power drawn by the power distribution board (3) on the power reception side from the power transmission and distribution network (2) corresponds to the power flow value set in the power conversion system (10) on the power transmission side. obtaining the set value of the power flow value from a power management system (50) that notifies the power conversion system (10) of the power receiving side of the set value of the power flow value on the power receiving side;
controlling the tidal flow value to the acquired set value;
The power conversion system (10) according to item 6.
According to this, in the power interchange between the plurality of distributed power supply systems (1), the principle of simultaneous and equal amount of power can be satisfied from moment to moment.
[Item 8]
The distributed power supply system (1) includes a power generation device (20) that converts renewable energy into electrical energy,
The control unit (15) executes at least one of charging and discharging control of the power storage unit (30), power generation suppression control of the power generation device (20), and power consumption control of the load (4), and controls the power consumption of the load (4). controlling the tidal flow value to the set value;
The power conversion system (10) according to item 7.
According to this, the power flow value can be maintained at the set value regardless of changes in the generated power or changes in the power consumption of the load (4).
[Item 9]
The control unit (15) includes:
If the remaining capacity that can be discharged from the power storage unit (30) falls below a specified value during the power interchange period when power is being released to the power transmission and distribution network (2), the power management system (50) inform you of information,
obtaining a set value of the changed power flow value from the power management system (50);
controlling the tidal flow value to the obtained changed set value;
The power conversion system (10) according to item 7 or 8.
According to this, even when the remaining capacity of the electricity storage unit (30) on the power transmission side is running low, power interchange can be continued as much as possible.
[Item 10]
The control unit (15) includes:
If the chargeable free capacity of the power storage unit (30) falls below a specified value during the power interchange period when power is being received from the power transmission and distribution network (2), the power storage unit information is sent to the power management system (50). Notify the
obtaining a set value of the changed power flow value from the power management system (50);
controlling the tidal flow value to the obtained changed set value;
The power conversion system (10) according to item 7 or 8.
According to this, even when the free capacity of the power storage unit (30) on the power receiving side is running low, power interchange can be continued as much as possible.
[Item 11]
The control unit (15) includes:
During the power interchange period during which power is being released to the power transmission and distribution network (2), if the discharge power from the power storage unit (30) exceeds a specified value based on the discharge rated power, the power management system (50 ) to notify the power storage unit information,
obtaining the changed power flow value settings from the power management system (50);
controlling the tidal flow value to the obtained changed set value;
The power conversion system (10) according to item 7 or 8.
According to this, even when the discharged power from the power storage unit (30) on the power transmission side is approaching the rated exceedance, power interchange can be continued as much as possible.
[Item 12]
The control unit (15) includes:
During the power interchange period when power is being received from the power transmission and distribution network (2), if the charging power to the power storage unit (30) exceeds a specified value based on the charging rated power, the power management system (50) Notify the power storage unit information to
obtaining a set value of the changed power flow value from the power management system (50);
controlling the tidal flow value to the obtained changed set value;
The power conversion system (10) according to item 7 or 8.
According to this, even when the charging power to the power storage unit (30) on the power receiving side approaches the rated overload, power interchange can be continued as much as possible.

1 Distributed power supply system, 2 System, 3 Distribution board, 4 In-home load, 5 In-home energy management system, 6 External network, 10 Power conversion system, 20 Solar battery, 30 On-vehicle storage battery, 11 First DC/DC converter, 12 Inverter , 13 second DC/DC converter, 15 control unit, 50 power management system, 51 processing unit, 511 order acquisition unit, 512 execution unit, 513 notification unit, 514 storage battery information acquisition unit, 515 setting value change unit, 52 storage unit, 53 Communications Department.

Claims (12)

A power management system that manages power interchange between multiple distributed power generation systems connected to the same power transmission and distribution network,
Each distributed power supply system has a power storage unit and a power conversion system,
The power conversion system can be controlled so that a power flow value between the distribution board to which the distributed power supply system and the load are connected and the power transmission and distribution network becomes a set value,
The power management system includes:
When power is exchanged between a plurality of distributed power generation systems via the power transmission and distribution network, the power released from the power distribution board on the power transmission side to the power transmission and distribution network, and the power released from the power distribution board on the power transmission side to the power transmission and distribution system, The set value of the power flow value on the power transmitting side is notified to the power conversion system on the power transmitting side, and the set value of the power flow value on the power receiving side is transmitted to the power conversion system on the power receiving side so that the power drawn from the power distribution grid corresponds to the power flow value set on the power transmitting side. Equipped with a notification section that notifies the system.
Power management system. At least one of the plurality of distributed power supply systems includes a power generation device that converts renewable energy into electrical energy,
The power conversion system performs at least one of charging and discharging control of the power storage unit, power generation suppression control of the power generation device, and power consumption control of the load to control the power flow value to the set value. do,
The power management system according to claim 1. an information acquisition unit that acquires power storage unit information notified from the power conversion system on the power transmission side when the remaining capacity that can be discharged from the power storage unit of the distributed power supply system on the power transmission side falls below a specified value;
Further comprising a setting value changing unit that reduces the setting value of the power flow value on the power transmission side and the setting value of the power flow value on the power receiving side according to the acquired power storage unit information,
The notification unit notifies the power conversion system on the power transmission side and the power conversion system on the power reception side of the changed setting value,
The power management system according to claim 1 or 2. an information acquisition unit that acquires power storage unit information notified from the power conversion system on the power receiving side when the free capacity that can be charged in the power storage unit of the distributed power supply system on the power receiving side falls below a specified value;
Further comprising a setting value changing unit that reduces the setting value of the power flow value on the power transmission side and the setting value of the power flow value on the power receiving side according to the acquired power storage unit information,
The notification unit notifies the power transmission side power conversion system and the power reception side power conversion system of the changed setting value,
The power management system according to claim 1 or 2. an information acquisition unit that acquires power storage unit information notified from the power conversion system on the power transmission side when discharge power from the power storage unit of the distributed power supply system on the power transmission side exceeds a specified value based on discharge rated power; ,
Further comprising a setting value changing unit that reduces the setting value of the power flow value on the power transmission side and the setting value of the power flow value on the power receiving side according to the acquired power storage unit information,
The notification unit notifies the power transmission side power conversion system and the power reception side power conversion system of the changed setting value,
The power management system according to claim 1 or 2. an information acquisition unit that acquires power storage unit information notified from the power conversion system on the power receiving side when charging power to the power storage unit of the distributed power supply system on the power receiving side exceeds a specified value based on charging rated power; ,
Further comprising a setting value changing unit that reduces the setting value of the power flow value on the power transmission side and the setting value of the power flow value on the power receiving side according to the acquired power storage unit information,
The notification unit notifies the power transmission side power conversion system and the power reception side power conversion system of the changed setting value,
The power management system according to claim 1 or 2. A power conversion system included in a distributed power supply system having a power storage unit,
A control unit capable of controlling a power flow value between a distribution board to which the distributed power supply system and the load are connected and a power transmission and distribution network to a set value,
The control unit includes:
When power is exchanged between a plurality of distributed power generation systems via the power transmission and distribution network, the power released from the power distribution board on the power transmission side to the power transmission and distribution network, and the power released from the power distribution board on the power transmission side to the power transmission and distribution system, The set value of the power flow value on the power transmitting side is notified to the power conversion system on the power transmitting side, and the set value of the power flow value on the power receiving side is transmitted to the power conversion system on the power receiving side so that the power drawn from the power distribution grid corresponds to the power flow value set on the power transmitting side. Obtaining the set value of the power flow value from the power management system that notifies the system,
controlling the tidal flow value to the acquired set value;
The power conversion system according to claim 6. The distributed power supply system includes a power generation device that converts renewable energy into electrical energy,
The control unit performs at least one of charging and discharging control of the power storage unit, power generation suppression control of the power generation device, and power consumption control of the load so that the power flow value becomes the set value. ,
The power conversion system according to claim 7. The control unit includes:
If the remaining capacity that can be discharged from the power storage unit falls below a specified value during the power interchange period during which power is being released to the power transmission and distribution network, notifying the power storage unit information to the power management system;
obtaining a set value of the changed power flow value from the power management system;
controlling the tidal flow value to the obtained changed set value;
The power conversion system according to claim 7 or 8. The control unit includes:
If the free chargeable capacity of the power storage unit falls below a specified value during the power interchange period during which power is being received from the power transmission and distribution network, notifying the power storage unit information to the power management system;
obtaining a set value of the changed power flow value from the power management system;
controlling the tidal flow value to the obtained changed set value;
The power conversion system according to claim 7 or 8. The control unit includes:
If the discharge power from the power storage unit exceeds a specified value based on the discharge rated power during the power interchange period during which power is released to the power transmission and distribution network, notifying the power storage unit information to the power management system,
obtaining a set value of the power flow value after the change from the power management system;
controlling the tidal flow value to the obtained changed set value;
The power conversion system according to claim 7 or 8. The control unit includes:
If the charging power to the power storage unit exceeds a specified value based on the charging rated power during the power interchange period when power is being received from the power transmission and distribution network, notifying the power storage unit information to the power management system;
obtaining a set value of the changed power flow value from the power management system;
controlling the tidal flow value to the obtained changed set value;
The power conversion system according to claim 7 or 8.

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