JP7341911B2 - relay device - Google Patents

Description

The present disclosure relates to a relay device.

BACKGROUND ART Power systems that manage a plurality of power devices connected to a power grid and control transmission and reception of power to and from the power grid are becoming popular. For example, Patent Document 1 discloses an example of a power system including a plurality of power devices and a processing device (management device). The processing device calculates an index (guidance command value) for controlling the predetermined power to be adjusted to the target power. The plurality of power devices are, for example, a solar power generation device and a power storage device. Each power device controls its output power in a distributed manner using the guidance command value calculated by the processing device. At this time, each power device calculates a target value of output power based on an optimization problem using the guidance command value. Then, the output power is controlled so that the output power reaches the target value. In this way, energy management of the power system is performed.

Japanese Patent Application Publication No. 2018-148627

Due to the diversification of power devices, types of power devices different from solar power generation devices and power storage devices are being connected to the power grid. An example of such a power device is a charger/discharger for electric vehicles (hereinafter referred to as "EV charger/discharger"). EV is an abbreviation for Electric Vehicle. EV chargers and dischargers generally charge electric vehicles, but some also discharge electric vehicles. For example, when electric power cannot be supplied from an electric power company during a disaster or the like, an electric vehicle may be used as a power source and the electric power stored in the electric vehicle may be used. However, in the power system described in Patent Document 1, power control including the EV charger/discharger is not taken into consideration.

The present disclosure was devised in view of the above issues, and its purpose is to relay communication between the processing device and the EV charger/discharger, thereby enabling energy management including the EV charger/discharger. The purpose is to provide a relay device.

A relay device of the present disclosure sets a connection point power at a connection point between a charger/discharger that charges and discharges an electric vehicle based on a received control command, and a power system including the charger/discharger and a power grid to target power. A relay device that relays communication with a processing device that calculates a guidance command value for a vehicle, the processing device setting the guidance command value, whether or not the electric vehicle can be charged, and whether or not the electric vehicle can be discharged. a receiving unit that receives setting information of the operating mode that has been set, and a calculation that calculates a target value of output power of the charger/discharger based on an optimization problem using the guidance command value and the setting information of the operating mode. a command unit that generates the control command based on the target value and the setting information of the operation mode; and a transmission unit that transmits the control command to the charger/discharger.

In a preferred embodiment of the relay device, the operation mode setting information includes setting information of a charging permission flag indicating whether charging is possible and setting information of a discharging permission flag indicating whether discharging is possible. includes a constraint condition, and the calculation unit changes the constraint condition based on the setting information of the charging permission flag and the setting information of the discharging permission flag.

In a preferred embodiment of the relay device, the receiving unit receives the charging rate of the electric vehicle from the charger/discharger, and the command unit is configured to receive the charging rate of the electric vehicle from the charger/discharger, and the command unit may receive the charging rate of the electric vehicle from the charger/discharger, and the command unit may receive the charging rate of the electric vehicle from the charger/discharger. When the charging rate is less than or equal to a first threshold value, the control command is generated so that the charger/discharger does not discharge the electric vehicle.

In a preferred embodiment of the relay device, the command unit issues the control command to cause the charger/discharger to charge the electric vehicle when the charging rate is less than or equal to a second threshold value that is smaller than the first threshold value. generate.

In a preferred embodiment of the relay device, the receiving unit further receives operation/stop flag setting information from the processing device, and receives operation enable/disable flag setting information from the charger/discharger. The operation/stop flag is a flag value indicating a driving instruction for instructing the charger/discharger to perform charging/discharging of the electric vehicle, or a flag value for instructing the charger/discharger to stop charging/discharging the electric vehicle. Either a flag value indicating that the electric vehicle is stopped is set, and the operation availability flag is a flag value indicating that the charger/discharger is in a state where it is possible to charge or discharge the electric vehicle. One of the flag values indicating that the electric vehicle cannot be driven, which is a state in which charging and discharging is impossible, is set, and the command unit is configured to set the electric vehicle based on the setting information of the driving/stopping flag and the setting information of the driving permission flag. Then, a run/stop command is generated that instructs the charger/discharger to charge/discharge the electric vehicle or not, and the transmitter further transmits the run/stop command to the charger/discharger.

The relay device of the present disclosure receives a guidance command value from the processing device, and converts the received guidance command value into an output target value. Then, a control command is generated based on the converted output target value, and the generated control command is transmitted to the charger/discharger. The charger/discharger charges and discharges the electric vehicle based on control commands. Therefore, the relay device enables energy management including the charger/discharger by relaying communication between the processing device and the charger/discharger.

1 is a diagram illustrating an example of the overall configuration of a power system including a relay device (EV gateway) of the present disclosure. It is a diagram showing an example of the configuration of an EV gateway. A setting example of each setting value of the EV gateway is shown. It is a time chart which shows the change of the charging rate of an electric vehicle when forced charging processing is executed. It is a figure which shows the simulation result for demonstrating the effect of correction|amendment based on the charging rate of an electric vehicle.

A preferred embodiment of the relay device of the present disclosure will be described below.

FIG. 1 shows an example of the overall configuration of a power system including a relay device according to the present disclosure. As shown in FIG. 1, the power system S1 according to the present embodiment includes a power line 90, a processing device A1, a plurality of power control units B1, and a power receiving facility C1. The plurality of power control units B1 include a PV output control unit 10, a storage battery output control unit 20, and a plurality of EV output control units 30. PV is an abbreviation for Photovoltaics. A solar cell 12 is connected to the PV output control section 10 . A storage battery 22 is connected to the storage battery output control section 20 . A plurality of electric vehicles 32 are connected to each of the plurality of EV output control units 30, one each. In the present disclosure, the electric vehicle 32 refers to a vehicle that can run using an electric motor as a power source, and includes a vehicle equipped with an internal combustion engine (for example, a plug-in hybrid vehicle). The electric motor operates using electric power stored in a storage battery provided in the electric vehicle 32.

The power system S1 is interconnected to the power grid D. The power system S1 is capable of transmitting power to the power system D (reverse power flow is possible) and receiving power from the power system D. In the present disclosure, it is assumed that when power is being output from the power system S1 to the power grid D, that is, when there is reverse power flow, the connection point power has a positive value. On the other hand, when power is being output from the power system D to the power system S1, it is assumed that the connection point power has a negative value. The connection point power is the power at the connection point between the power system S1 and the power grid D.

When the power system D is normal, the power system S1 functions as a charging station that charges an electric vehicle or a power peak cut system that suppresses power demand peaks. On the other hand, when an abnormality occurs in the power system D, it functions as an emergency power source that supplies power to important loads. Whether the power system S1 functions as a charging station, a power peak cut system, or an emergency power source is determined by the EV operation mode described below.

In the power system S1, the processing device A1 and the plurality of power control units B1 cooperate to perform power control so that the connection point power becomes the target power. Target power is a target value of connection point power. In power control of the power system S1, the processing device A1 calculates a guidance command value for controlling the connection point power to the target power. Each power control unit B1 calculates an output target value of the controlled object (solar cell 12, storage battery 22, or each electric vehicle 32) based on the guidance command value calculated by the processing device A1. Then, each power control unit B1 controls the output power of the controlled object based on the calculated output target value. In this way, in the power system S1, the plurality of power control units B1 control the output power in a distributed manner, thereby controlling the connection point power to the target power. The guidance command value is also used by each power control unit B1 to calculate the output target value. In this embodiment, the larger the guidance command value calculated by the processing device A1, the smaller the connection point power, and the smaller the guidance command value, the larger the connection point power.

The power line 90 constructs a power network in the power system S1. Power system S1 is connected to power system D by power line 90. The power line 90 includes one that connects each power control unit B1 and each controlled object, one that connects each power control unit B1 and the power receiving equipment C1, and one that connects the power receiving equipment C1 and the power load 42. Contains.

The power receiving equipment C1 includes a power distribution board and a power distribution board. The power receiving equipment C1 can communicate with the processing device A1. This communication may be a wireless method or a wired method. The power receiving equipment C1 receives power from the power system D and each power control unit B1 via the power line 90. The power receiving equipment C1 transmits the received power to the power system D, each power control unit B1 (excluding the PV output control unit 10), each power load 42, etc. via the power line 90. The power receiving equipment C1 includes a power sensor (not shown) installed at a connection point between the power system S1 and the power system D, and detects the power at the connection point with this power sensor. The power receiving equipment C1 transmits the detected value of the connection point power to the processing device A1. The power receiving equipment C1 includes various protection devices for interconnecting the power system S1 to the power grid D as necessary. For example, if the power system S1 is a system in which reverse power flow to the power grid D is prohibited, a reverse power relay is included as a protection device.

The power load 42 is something that consumes power. The power load 42 includes a general load and an important load (not shown). The power supply from the power receiving equipment C1 to the power load 42 is divided into general loads and important loads. In other words, the power receiving equipment C1 can supply power only to general loads, only important loads, or both general loads and important loads.

The processing device A1 is capable of communicating with each of the plurality of power control units B1 and power receiving equipment C1. Each of these communications may be a wireless method or a wired method. Processing device A1 monitors the connection point power and calculates a guidance command value for controlling the connection point power to the target power. The connection point power may be a detected value received from the power receiving equipment C1, or may be an estimated value calculated from the value of each output power acquired through communication from each power control unit B1. The target power may be automatically set by the processing device A1 according to the status of the power system S1, or may be set by a user operation, or by a host device (not shown) of the processing device A1 (for example, an electric power company, etc.). ) may also be set according to instructions from. Processing device A1 transmits the calculated guidance command value to each of the plurality of power control units B1 (PV output control unit 10, storage battery output control unit 20, and plural EV output control units 30). For example, the processing device A1 is set with state equations (simultaneous differential equations) shown in the following equation (1) and the following equation (2), and calculates the guidance command value pr(t) by solving this state equation. do. The processing device A1 calculates the guidance command value every predetermined time (for example, 1 [sec]). In equations (1) and (2) below, P(t) is the connection point power, P ^C (t) is the target power, λ(t) is the state variable, pr(t) is the guidance command value, and ε is is the slope coefficient.

A charging permission flag and a discharging permission flag are set in the processing device A1. The charging permission flag is flag information indicating whether charging of the electric vehicle 32 is permitted or prohibited. The charging permission flag is set to a flag value of "0" when charging of the electric vehicle 32 is prohibited, and is set to a flag value of "1" when charging of the electric vehicle 32 is permitted. The discharge permission flag is flag information indicating whether discharge of the electric vehicle 32 is permitted or prohibited. The discharge permission flag is set to a flag value "0" when discharging the electric vehicle 32 is prohibited, and is set to a flag value "1" when discharging the electric vehicle 32 is permitted. The charging permission flag and the discharging permission flag are each set depending on the EV driving mode set in the processing device A1. The EV operation mode is a setting that determines the system function of the power system S1, and includes, for example, a quick charging mode, a peak cut mode, and an emergency power supply mode. The quick charging mode causes the power system S1 to function as the charging station described above, and is intended to charge each electric vehicle 32. In the quick charge mode, the charge permission flag is set to a flag value of "1", and the discharge permission flag is set to a flag value of "0". Thereby, the electric power system S1 is permitted to charge the electric vehicle 32, and is prohibited from discharging the electric vehicle 32. The peak cut mode is a mode in which the power system S1 functions as a power peak cut system, and is aimed at, for example, peak cut of connection point power. In the peak cut mode, the charge permission flag is set to a flag value of "1", and the discharge permission flag is set to a flag value of "1". This allows the power system S1 to both charge and discharge the electric vehicle 32. The purpose of the emergency power supply mode is to cause the power system S1 to function as an emergency power supply and to supply power to an important load (power load 42) based on a business continuity plan in the event of a system abnormality or the like. In the emergency power supply mode, the charge permission flag is set to a flag value of "0", and the discharge permission flag is set to a flag value of "1". As a result, the electric power system S1 is prohibited from charging the electric vehicle 32, and is permitted to discharge the electric vehicle 32. The processing device A1 transmits the setting information of the charging permission flag and the setting information of the discharging permission flag to each EV output control unit 30, thereby transmitting the setting information of the EV driving mode to each EV output control unit 30 (EVGW 33 described below). ).

In addition to the EV operation mode (charging permission flag and discharge permission flag), an operation/stop flag is set in the processing device A1. The operation/stop flag is flag information indicating whether or not each EV output control unit 30 is caused to charge and discharge each electric vehicle 32. When not causing each EV output control unit 30 to charge/discharge each electric vehicle 32, a flag value "0" (a flag value indicating a stop instruction) is set in the run/stop flag, and on the other hand, each EV output When the control unit 30 executes charging and discharging of each electric vehicle 32, a flag value "1" (a flag value indicating a driving instruction) is set in the driving/stopping flag. The operation/stop flag may be automatically set by the processing device A1 according to the status of the power system S1, or may be set by a user operation, or by a host device (not shown) of the processing device A1 (for example, the power system S1). It may also be set based on instructions from a company (such as a company). The processing device A1 transmits the setting information of the operation/stop flag to each EV output control unit 30 (EVGW 33 to be described later).

Each of the plurality of power control units B1 controls the output power of the connected control target (solar cell 12, storage battery 22, or each electric vehicle 32). The plurality of power control units B1 include a PV output control unit 10 that controls the solar cell 12, a storage battery output control unit 20 that controls the storage battery 22, and a plurality of power control units that each control the electric vehicle 32. It includes an EV output control section 30.

The PV output control unit 10 controls power generation by the solar cell 12. The PV output control unit 10 includes a solar power conditioner 11 and a solar gateway 13. In the following description, the power conditioner will be referred to as "PCS" and the gateway will be referred to as "GW". The solar PCS 11 and the solar GW 13 perform two-way communication. The sunlight PCS 11 and the sunlight GW 13 are not limited to being configured as separate modules, but may be configured as one module.

The solar GW 13 relays communication between the processing device A1 and the solar PCS 11. The sunlight GW 13 receives the guidance command value from the processing device A1, and calculates the output target value of the sunlight PCS 11 based on the received guidance command value. A method for calculating the output target value will be described later. The solar GW 13 generates a control command including the calculated output target value, and transmits this to the solar PCS 11.

The solar cell PCS 11 is connected to the solar cell 12, and converts the power (for example, DC power) generated by the solar cell 12 into power (for example, AC power) suitable for grid connection and outputs the converted power. In FIG. 1, one solar cell 12 is connected to the solar PCS 11, but a plurality of solar cells 12 may be connected. The solar PCS 11 is connected to the power receiving equipment C1 by a power line 90. The solar power PCS 11 outputs the power generated by the solar cell 12 to the power receiving equipment C1. The solar PCS 11 controls the output power of the control target (solar cell 12) by controlling the amount of power generated by the solar cell 12 based on the control command received from the solar GW 13. Specifically, the solar power PCS 11 performs power control so that the output power of the solar cell 12 becomes the output target value included in the control command.

The storage battery output control unit 20 controls charging and discharging of the storage battery 22. The storage battery output control unit 20 includes a storage battery PCS21 and a storage battery GW23. Storage battery PCS21 and storage battery GW23 perform two-way communication. The storage battery PCS21 and the storage battery GW23 are not limited to being configured as separate modules, but may be configured as one module.

Storage battery GW23 relays communication between processing device A1 and storage battery PCS21. Storage battery GW23 receives the guidance command value from processing device A1, and calculates the output target value of storage battery PCS21 based on the received guidance command value. A method for calculating the output target value will be described later. Storage battery GW23 generates a control command including the calculated output target value, and transmits this to storage battery PCS21.

The storage battery PCS21 is connected to the storage battery 22 and charges and discharges the storage battery 22. In FIG. 1, one storage battery 22 is connected to the storage battery PCS21, but a plurality of storage batteries 22 may be connected. The storage battery 22 is, for example, a secondary battery or a capacitor. Storage battery PCS21 is connected to power receiving equipment C1 by power line 90. The storage battery PCS21 charges the storage battery 22 by supplying the storage battery 22 with electric power input from the power receiving equipment C1. Further, the storage battery PCS21 discharges the storage battery 22 by outputting the power stored in the storage battery 22 to the power receiving equipment C1. The storage battery PCS21 controls the output power of the control target (storage battery 22) by controlling the amount of power supplied to the storage battery 22 and the amount of power released from the storage battery 22 based on the control command received from the storage battery GW23. Specifically, the storage battery PCS 21 performs power control so that the output power of the storage battery 22 becomes the output target value included in the control command. Storage battery PCS21 discharges storage battery 22 when the output target value in the received control command is a positive value. On the other hand, when the output target value in the received control command is a negative value, the storage battery 22 is charged.

Each of the plurality of EV output control units 30 controls charging and discharging of the electric vehicle 32. Each of the plurality of EV output control units 30 includes an EV charger/discharger 31 and an EVGW 33. The EV charger/discharger 31 and the EVGW 33 perform bidirectional communication. The EV charger/discharger 31 and the EVGW 33 are not limited to being configured as separate modules, but may be configured as one module.

Each of the plurality of EVGWs 33 relays communication between the processing device A1 and each EV charger/discharger 31. Each EVGW 33 receives the guidance command value from the processing device A1, and calculates the output target value of each EV charger/discharger 31 based on the received guidance command value. A method for calculating the output target value will be described later. Each EVGW 33 generates a control command including the calculated output target value, and transmits this to each EV charger/discharger 31, respectively. The detailed configuration of each EVGW 33 will be described later. Each EVGW 33 corresponds to a "relay device" described in the claims.

Each of the plurality of EV chargers and dischargers 31 is connected to an electric vehicle 32, and charges and discharges the electric vehicle 32 (specifically, charges and discharges a storage battery provided in the electric vehicle 32). In FIG. 1, one electric vehicle 32 is connected to each EV charger/discharger 31, but a plurality of electric vehicles 32 may be connected. Each EV charger/discharger 31 is connected to power receiving equipment C1 via a power line 90. Each EV charger/discharger 31 charges each electric vehicle 32 by supplying electric power input from the power receiving equipment C1 to each electric vehicle 32, respectively. Further, each EV charger/discharger 31 discharges each electric vehicle 32 by outputting the electric power stored in each electric vehicle 32 to the power receiving equipment C1. Each EV charger/discharger 31 controls the amount of power supplied to each electric vehicle 32 and the amount of power released from each electric vehicle 32 based on the control command received from each EVGW 33, thereby controlling the amount of power supplied to the control target (each electric vehicle 32). ) controls the output power. Each EV charger/discharger 31 discharges each electric vehicle 32 when the output target value in the received control command is a positive value. On the other hand, when the output target value in the received control command is a negative value, the electric vehicle 32 is charged. In the following description, a positive output target value may be referred to as a "discharge target value", and a negative output target value may be referred to as a "charging target value".

Each EV charger/discharger 31 acquires the state of charge (SoC) of the electric vehicle 32 to which it is connected. Each EV charger/discharger 31 transmits the charging rate of each electric vehicle 32 to each EVGW 33. Information on the charging rate of the electric vehicle 32 is used in each EVGW 33 to calculate an output target value and to determine whether to execute a discharging prohibition process and a forced charging process, which will be described later.

Each EV charger/discharger 31 is set with an operation permission flag. The drivability flag is flag information indicating whether each EV charger/discharger 31 is in a state where it can charge and discharge each electric vehicle 32 (a state where it can be driven). When the EV charger/discharger 31 is in an unoperable state, a flag value "0" is set in the operable flag, and on the other hand, when the EV charger/discharger 31 is in an operable state, a flag value "1" is set in the operable flag. " is set. Each EV charger/discharger 31 transmits setting information of the operation permission flag to each EVGW 33.

Each EV charger/discharger 31 includes a notification device such as a display (not shown) or a speaker (not shown). Each EV charger/discharger 31 can notify the user of the charging status of the electric vehicle 32, system abnormality, etc. by notification using a notification device (for example, display on a display or audio output from a speaker).

Next, a detailed configuration example of each EVGW 33 will be described with reference to FIG. 2. As shown in the figure, each EVGW 33 includes a receiving section 331, a flag setting section 332, a calculating section 333, a command section 334, and a transmitting section 335.

The receiving unit 331 receives a plurality of signals transmitted from the processing device A1 and each EV charger/discharger 31. The signals received from the processing device A1 include a signal based on the guidance command value, a signal based on the setting information of the run/stop flag, and a signal based on the setting information of the EV driving mode (each setting information of the charging permission flag and the discharging permission flag). There is a signal based. The signals received from each EV charger/discharger 31 include a signal based on the charging rate of each electric vehicle 32 and a signal based on setting information of a driving permission flag.

When the peak cut discharge permission flag is set by an operation unit (not shown) provided in each EVGW 33, the flag setting unit 332 sets the peak cut discharge permission flag in accordance with the setting operation. . The peak cut discharge permission flag is a flag for setting a specific EV charger/discharger 31 to not discharge even if the EV operation mode is the peak cut mode. When discharging each electric vehicle 32 is prohibited, the flag value "0" is set to the peak cut discharge permission flag, and when discharging of each electric vehicle 32 is permitted, the flag value "1" is set to the peak cut discharge permission flag. is set.

The flag setting unit 332 sets an abnormality flag depending on whether an internal abnormality has occurred in the processing device A1. This abnormality flag is called a "first abnormality flag." If no abnormality has occurred inside the processing device A1, the first abnormality flag is set to the flag value “0”, and if an abnormality has occurred inside the processing device A1, the first abnormality flag is set to the flag value “0”. 1" is set. Further, the flag setting unit 332 sets an abnormality flag depending on whether an internal abnormality has occurred in each EVGW 33. This abnormality flag is called a "second abnormality flag." If no abnormality occurs inside each EVGW 33, the flag value "0" is set to the second abnormality flag, and if an abnormality occurs inside each EVGW 33, the flag value "1" is set to the second abnormality flag. is set.

The calculation unit 333 receives the guidance command value that the reception unit 331 received from the processing device A1, and the EV driving mode setting information (the charging permission flag and discharging permission flag setting information) that the reception unit 331 received from the processing device A1. , and the charging rate of the electric vehicle 32 received by the receiving unit 331 from each EV charger/discharger 31 , the output target value of the EV charger/discharger 31 is calculated. A method for calculating the output target value will be described later.

The command unit 334 receives the EV driving mode setting information (the charging permission flag and the discharging permission flag setting information) received by the receiving unit 331, the output target value calculated by the calculating unit 333, and the setting information set by the flag setting unit 332. A control command is generated based on the setting information of the discharge permission flag during peak cut. The control command includes an output target value and a charge/discharge command. When the command value is "0", the charging/discharging command indicates a charging command to instruct the electric vehicle 32 to be charged, and when the command value is "1", it indicates a discharging command to instruct the electric vehicle 32 to be discharged. The charge/discharge command is normally determined according to the calculated output target value, and when the output target value is the discharge target value (positive value), the command value becomes "1", and the output target value becomes the charge target value (negative value). ), the command value is "0". However, when the charge permission flag has the flag value "0", the charge/discharge command is set to the command value "1" (discharge command) even if the output target value is the charge target value. At this time, the output target value is also corrected to 0kW. Further, when the discharge permission flag has the flag value "0", the charge/discharge command is set to the command value "0" (charging command) even if the output target value is the discharge target value. At this time, the output target value is also corrected to 0kW. Further, when the peak cut discharge permission flag has a flag value of "0", the charge/discharge command is set to the command value "0" (charging command) even if the output target value is the discharge target value. At this time, the output target value is also corrected to 0kW.

When the command unit 334 generates the control command, if the charging rate of each electric vehicle 32 is less than or equal to a first threshold value (for example, 35%), the command unit 334 performs the following discharging prohibition process. In this discharge prohibition process, the command unit 334 corrects the output target value to, for example, 0 kW even if the output target value calculated by the calculation unit 333 is the discharge target value. The command unit 334 then generates a control command using the corrected output target value (0 kW) as the output target value. With this discharge prohibition process, when the charging rate of each electric vehicle 32 is below the first threshold value, each EV charger/discharger 31 is not allowed to discharge each electric vehicle 32 even if the calculated output target value is the discharge target value. controlled as follows. Further, when the charging rate of the electric vehicle 32 becomes equal to or lower than the second threshold while executing the discharging prohibition process, the command unit 334 performs the following forced charging process. The second threshold is a lower limit value (for example, 30%) of the charging rate of the electric vehicle 32, and is a value smaller than the first threshold. In this forced charging process, the command unit 334 generates a control command using a preset forced charging target value as the output target value. The forced charging target value is a charging target value, and is, for example, −3 kW in this embodiment in which the electric vehicle 32 is charged when the output target value is a negative value. Through this forced charging process, when the charging rate of each electric vehicle 32 becomes equal to or less than the second threshold value, each EV charger/discharger 31 is controlled to forcibly charge each electric vehicle 32. Note that the forced charging process is executed even if, for example, the emergency power supply mode is set and the charging permission flag has a flag value of "0" (charging prohibited). The forced charging process is ended when the charging rate of each electric vehicle 32 becomes equal to or higher than a preset forced charging end threshold (for example, 32%). The forced charging end threshold may be a value between the first threshold and the second threshold, or may be the same value as the first threshold. Further, the forced charging process is also terminated when the output target value calculated by the calculation unit 333 becomes a value smaller than the forced charging target value.

The command unit 334 generates a run/stop command based on the information on the run/stop flag received by the receiving unit 331 and the information on the drive permission flag received by the receiving unit 331. When the command value is "0", the run/stop command indicates a stop command that does not cause each EV charger/discharger 31 to charge/discharge each electric vehicle 32, and when the command value is "1", each EV charger/discharger 31 2 shows driving commands for charging and discharging each electric vehicle 32. When the run/stop flag has a flag value of "1" (a flag value indicating a drive instruction) and the drive permission flag has a flag value of "1" (a flag value indicating that a drive is possible), the command unit 334 starts the operation. / Set the stop command to the command value "1" (operation command), and otherwise set the run/stop command to the command value "0" (stop command). That is, if either the run/stop flag or the run permission flag has a flag value of "0", the run/stop command has a command value of "0".

The command unit 334 checks the first abnormal flag set by the flag setting unit 332, and if the first abnormal flag has a flag value of “1”, outputs the setting information of the first abnormal flag to the transmitting unit 335. Further, the command unit 334 checks the second abnormality flag set by the flag setting unit 332, and if the second abnormality flag has a flag value of “1”, outputs the setting information of the second abnormality flag to the transmitting unit 335. do. The command unit 334 checks the setting information of the discharge permission flag received by the receiving unit 331, and outputs the setting information of the discharge permission flag to the transmitting unit 335 when the discharge permission flag has the flag value “1”.

The transmitting unit 335 transmits the control command and operation/stop command generated by the command unit 334 to the EV charger/discharger 31. Further, the transmitting unit 335 transmits the discharge permission flag setting information, the first abnormality flag setting information, and the second abnormality flag setting information input from the command unit 334 to the EV charger/discharger 31.

The run/stop command transmitted from the transmitter 335 is received by each EV charger/discharger 31, and each EV charger/discharger 31 receives a command value of "0" (stop command) when the received run/stop command is a command value of "0" (stop command). The electric vehicle 32 is not charged or discharged, and, on the other hand, when the received operation stop command has a command value of "1" (operation command), the electric vehicle 32 is charged or discharged.

The control command transmitted from the transmitter 335 is received by each EV charger/discharger 31, and each EV charger/discharger 31 controls electricity based on the received control command when the operation stop command has a command value of "1". Charge/discharge control of the automobile 32 is executed. Specifically, each EV charger/discharger 31 controls charging and discharging of each electric vehicle 32 so that the output power becomes the output target value included in the received control command.

The setting information of the first abnormality flag transmitted from the transmitter 335 is received by each EV charger/discharger 31, and upon receiving the setting information of the first abnormality flag, each EV charger/discharger 31 starts charging the electric vehicle 32. In addition to stopping the discharge, a notification device (not shown) notifies the user that an abnormality has occurred in the processing device A1. Further, the setting information of the second abnormality flag transmitted from the transmitting unit 335 is received by each EV charger/discharger 31, and when each EV charger/discharger 31 receives the setting information of the second abnormality flag, the electric vehicle 32 At the same time, a notifying device (not shown) notifies the user that an abnormality has occurred in each EVGW 33.

The discharge permission flag setting information transmitted from the transmitter 335 is received by each EV charger/discharger 31, and upon receiving the discharge permission flag setting information, each EV charger/discharger 31 starts discharging the electric vehicle 32. A notification device (not shown) notifies the user that there is a possibility that the event may occur.

Next, a method of calculating the output target value performed by each power control unit B1 (specifically, each of the solar GW 13, the storage battery GW 23, and the plurality of EVGWs 33) will be described. In the following description, the solar GW 13, the storage battery GW 23, and the plurality of EVGWs 33 may be each referred to as a "GW section". Each of the GW units 13, 23, and 33 uses the guidance command value received from the processing device A1 to calculate an output target value based on a preset optimization problem. This optimization problem includes an evaluation function and constraints.

Each GW section 13, 23, 33 is set with the following formula (3) and formula (4) derived from the set evaluation function, and the output target value P is determined by this formula. Calculate ^ref . In the following equation (3) and the following equation (4), P ^ref is each output target value of the solar PCS 11, the storage battery PCS 21, and the plurality of EV chargers/dischargers 31, pr is the guidance command value, pr ^lmt is the guidance command value limit, a ₁ is the first parameter, a ₂ is the second parameter, a ₃ is the third parameter, and a ₄ is the fourth parameter. The guidance command value limit pr ^lmt is a value that defines the maximum value and minimum value of the guidance command value pr used in the power system S1. The value Λ calculated by the following equation (4) is limited to a value between the minimum value (-pr ^lmt ) of the guidance command value pr and the maximum value (pr ^lmt ) of the guidance command value pr. The first parameter a ₁ is a parameter that mainly adjusts the amount of change in the output power in accordance with the change in the guidance command value pr. The second parameter a ₂ is a parameter that mainly adjusts the output power when the guidance command value pr is around 0. The third parameter _a3 is a parameter that mainly adjusts the guidance command value pr at which the output power starts to change. The fourth parameter _a4 is a parameter according to the charging rate (SoC) of the connected storage battery 22 or the charging rate (SoC) of the connected electric vehicle 32. Each of these design parameters a ₁ to a ₄ is set for the solar GW 13, the storage battery GW 23, and the plurality of EVGWs 33, respectively. The setting values of the design parameters a ₁ to a ₄ will be described later. Note that each GW unit 13, 23, and 33 calculates the output target value P ^ref by solving the set evaluation function instead of using the arithmetic expressions shown in equations (3) and (4) below. Good too.

Each of the GW units 13, 23, and 33 sets the output target value P ^ref calculated by the arithmetic expressions shown in the above equations (3) and (4) to each of the solar GW 13, the storage battery GW 23, and the plurality of EVGWs 33. If the constraint condition is not satisfied, the output target value is corrected so as to satisfy the constraint condition. A description of each constraint condition set for the sunlight GW13 and the storage battery GW23 will be omitted.

The constraint conditions for each EVGW 33 include a limited output constraint, an EV operation mode constraint, and an output current constraint, and are expressed, for example, by the following equation (5). The limited output constraint is expressed by the following equation (5a). In the following equation (5a), P ^max represents the maximum value of output power (maximum output value), and P ^min represents the minimum value of output power (minimum output value). The EV driving mode constraint is expressed by the following equation (5b). α and β represent adjustment parameters adjusted by the EV operation mode setting information (discharge permission flag and charge permission flag setting information) received from the processing device A1. For example, when the charging permission flag has a flag value of "0" (a flag value indicating that charging is prohibited), 0 is set for α, and when the charging permission flag has a flag value of "1" (a flag value indicating that charging is permitted), α P ^min is set to . Furthermore, when the discharge permission flag has a flag value of "0" (a flag value indicating that discharge is prohibited), 0 is set to β, and when the discharge permission flag has a flag value of "1" (a flag value indicating that discharge is permitted), β P ^max is set to . The output current constraint is expressed by the following equation (5c). In equation (5c) below, Q ₃₁ is the reactive power of each EV charger/discharger 31, S ₃₁ ^d is the maximum apparent power that can be output by each EV charger/discharger 31, and V ₀ is the reference voltage at the connection point at the time of design. , V ₃₁ represent the output voltage of each EV charger/discharger 31, respectively. Note that instead of the output current constraint, a constraint based on the rated capacity of the EV charger/discharger 31 (rated capacity constraint) may be used.

A plurality of setting values are set in each of the GW units 13, 23, and 33 in order to calculate the output target value P ^ref based on the above optimization problem. The plurality of setting values include, for example, a maximum output setting value sv _max , a minimum output setting value sv _min , a first setting value sv ₁ , a second setting value sv ₂ , a third setting value sv ₃ , and a fourth setting value There is sv ₄ . The maximum output setting value sv _max is a setting value that defines the maximum output value P ^max . The minimum output setting value sv _min is a setting value that defines the minimum output value P ^min . The maximum output setting value sv _max and the minimum output setting value sv _min are set based on the rated output prescribed for each of the solar PCS 11, the storage battery PCS 21, and the plurality of EV chargers/dischargers 31, for example. The first set value sv ₁ is a set value of a value to be substituted for the first parameter a ₁ . The first setting value sv ₁ is an arbitrary value, and when the connection point power at the time of reverse power flow is a positive value, a value of "0" or more is set. The second set value sv ₂ is a set value of a value to be substituted for the second parameter a ₂ . The second setting value sv ₂ is set to one of "+1", "0", and "-1". When the second set value sv ₂ is "+1", the output target value P ^ref becomes a positive value when the guidance command value pr is around "0", and when the second set value sv ₂ is -1, the guidance command When the value pr is around "0", the output target value P ^ref becomes a negative value, and when the second set value sv ₂ is "0", the output target value P is around when the guidance command value pr is around "0". ^ref becomes "0". The third set value sv ₃ is a set value of a value to be substituted for the third parameter a ₃ . An arbitrary value is set as the third setting value. The fourth setting value sv ₄ is a setting value of a value to be substituted into the fourth parameter a ₄ . The fourth setting value sv ₄ (fourth parameter a ₄ ) is set as follows. The fixed value 1 is set to the solar power GW 13 because no storage battery is connected thereto, and the calculated value of the following equation (6) is set to the storage battery GW 23 and each EVGW 33. In equation (6) below, ω _SoC is calculated using equation (7) _below , and for ω _{SoC_tmp} , the smaller of equation (8) or equation (9) below is used. In equations (7) to (9) below, A _SoC is the offset of the weight w _SoC , K _SoC is the gain of the weight w _SoC , and s _sw is the on/off switch of the weight w _SoC (for example, 1 when on, 0 when off), SoC _p indicates the current SoC of the storage battery 22 or each electric vehicle 32, and SoC _d indicates the reference SoC. In each EVGW 33, the value of the charging rate of each electric vehicle 32 received by the receiving unit 331 from each EV charger/discharger 31 is used as SoC _P. These setting values can be set separately when the received guidance command value is a positive value and when it is a negative value. The setting that corresponds to when the guidance command value is a positive value (including "0") is called "positive guidance command value setting", and the setting that corresponds to when the guidance command value is a negative value is called "negative guidance value setting". "Command value setting".

For example, in the EVGW 33, as shown in FIG. 3(a), by setting each set value sv _max , sv _min , sv ₁ , sv ₂ , sv ₃ , the output target value P ^ref changes with respect to the guidance command value pr. The characteristics are shown by the characteristic line shown in FIG. 3(b). It is assumed that the fourth setting value sv ₄ is set to "1". In the EVGW 33, for example, by setting s _sw in the above equations (7) to (9) to "0", the fourth set value sv ₄ is set to "1". By setting this set value sv ₄ , the charging rate of the storage battery 22 and the charging rate of each electric vehicle 32 are not taken into consideration when calculating the output target value P ^ref . FIG. 3 is an example of each setting in the three EVGWs 33. The three EVGWs 33 are distinguished from EVGWs 33a, 33b, and 33c, respectively.

In each EVGW 33a to 33c, as shown in FIG. 3(a), a fixed value "-1" is set for each second set value sv ₂ of the positive guidance command value setting and the negative guidance command value setting. . With this setting, as shown in FIG. 3(b), when the guidance command value pr is "0", each output target value P ^ref of each EVGW 33a to 33c is a negative value. That is, each EVGW 33a to 33c causes each EV charger/discharger 31 to charge the electric vehicle 32 (receive power from the power receiving equipment C1) when the induction command value pr is "0". Further, in each of the EVGWs 33a to 33c, each set value of the positive guidance command value setting is set as shown in FIG. 3(a). With this setting, as shown in FIG. 3(b), when the guidance command value pr is a positive value, the output target value P ^ref of each EVGW 33a to 33c becomes the minimum output value P ^min . In other words, each EVGW 33a to 33c causes each EV charger/discharger 31 to charge the electric vehicle 32 with the power of the set minimum output value P ^min (receiving power from the power receiving equipment C1) when the induction command value pr is a positive value. ).

In the power system S1 configured as described above, each EVGW 33 receives the guidance command value and each flag information from the processing device A1 and each EV charger/discharger 31. Each EVGW 33 generates each command (control command or operation/stop command) based on the received guidance command value and each flag information, and transmits it to each EV charger/discharger 31. Then, each EV charger/discharger 31 performs charging/discharging of each electric vehicle 32 based on each received command. In other words, each EV output control unit 30 performs power control using the guidance command value and processes each flag information, so that the power system S1 performs power control using the guidance command value and Power control specific to charging and discharging of the automobile 32 can be performed.

In the power system S1, each EV output control unit 30 may switch between control for charging each electric vehicle 32 and control for discharging each electric vehicle 32. At this time, switching between control for charging each electric vehicle 32 and control for discharging each electric vehicle 32 is performed in the following order. The order shown below shows a case where the control for charging each electric vehicle 32 is switched to the control for discharging each electric vehicle 32, but the reverse is also performed in the same manner. For example, when the output target value (control command) transmitted from each EVGW 33 to each EV charger/discharger 31 changes from the charge target value to the discharge target value, each electric vehicle 32 is The control switches to discharge. Further, in the order shown below, each EVGW 33 assumes that the operation/stop flag that it receives from the processing device A1 always has a flag value of "1" (a flag value that instructs operation).

When the output target value calculated in each EVGW 33 changes from the charging target value to the discharging target value, each EVGW 33 first changes the charging/discharging command from the command value "0" (charging command) to the command value "1" ( A charge/discharge command (control command) with a command value of “1” is transmitted to each EV charger/discharger 31. When each EV charger/discharger 31 receives a charge/discharge command with a command value of "1" (discharge command), it sets the operation permission flag to a flag value of "0" (a flag value indicating that operation is not possible), and sets the operation permission flag setting information to (flag value “0”) is transmitted to each EVGW 33. When each EVGW 33 receives the flag value “0” as the setting information of the operation permission flag, it transmits an operation/stop command with a command value “0” (stop command) to each EV charger/discharger 31.

Next, when each EV charger/discharger 31 receives the operation/stop command with the command value "0", it shifts from the charging operation sequence, through the charging end sequence, and then to the charging standby sequence. That is, each EV charger/discharger 31 transitions from a state in which it is charging each electric vehicle 32 to a state in which it finishes charging each electric vehicle 32 and stands by for charging each electric vehicle 32. When each EV charger/discharger 31 transitions to the charging standby sequence, it transitions from the charging standby sequence to the discharging standby sequence in accordance with the charging/discharging command of the command value "1" (discharging command) received from each EVGW 33. That is, each EV charger/discharger 31 shifts from a state in which it stands by for charging each electric vehicle 32 to a state in which it stands by for discharging each electric vehicle 32. In the charging standby sequence and the discharging standby sequence, each EV charger/discharger 31 is in a standby state. The standby state is a state in which the operating devices such as hard disks and displays in each EV charger/discharger 31 are temporarily stopped so that they can be immediately restored as necessary.

Next, each EV charger/discharger 31 starts an operation check at the start of operation. When each EV charger/discharger 31 completes the operation check without any problems, it switches the operability flag from flag value "0" (flag value indicating that operation is not possible) to flag value "1" (flag value indicating that operation is possible). , the setting information of the operation permission flag (flag value "1") is transmitted to each EVGW 33.

Next, when each EVGW 33 receives the flag value “1” as the setting information of the operation permission flag, it transmits an operation/stop command with a command value “1” (operation command) to each EV charger/discharger 31. When each EV charger/discharger 31 receives an operation/stop command with a command value of "1" (operation command), the EV charger/discharger 31 shifts from a discharge standby sequence, through a discharge preparation sequence, and then to a discharge operation sequence. That is, each EV charger/discharger 31 prepares for discharging each electric vehicle 32 from a state where it is waiting for discharging of each electric vehicle 32, and starts discharging each electric vehicle 32. Through the above steps, the control for charging the electric vehicle 32 shifts to the control for discharging the electric vehicle 32.

The effects of the power system S1 of the present disclosure are as follows.

The power system S1 includes an EVGW 33 that relays communication between the processing device A1 and the EV charger/discharger 31. The processing device A1 calculates a guidance command value for setting the connection point power to the target power. The EV charger/discharger 31 charges and discharges the electric vehicle 32 based on the received control command. The EVGW 33 includes a receiving section 331, a calculating section 333, a command section 334, and a transmitting section 335. The receiving unit 331 receives the guidance command value and the EV driving mode setting information from the processing device A1. The calculation unit 333 calculates the output target value of the EV charger/discharger 31 based on the guidance command value and the EV driving mode setting information that the reception unit 331 received. The command unit 334 generates a control command based on the output target value calculated by the calculation unit 333 and the EV driving mode setting information received by the reception unit 331. The transmitting unit 335 transmits the control command generated by the command unit 334 to the EV charger/discharger 31. According to this configuration, the EVGW 33 receives the guidance command value from the processing device A1, and converts the received guidance command value into an output target value. Then, a control command is generated based on the converted output target value, and the generated control command is transmitted to the EV charger/discharger 31. Therefore, the EVGW 33 enables energy management including the EV charger/discharger 31 in the power system S1.

In the electric power system S1, the EV driving mode setting information includes charging permission flag setting information and discharging permission flag setting information. When calculating the output target value from the guidance command value, the calculation unit 333 checks the setting information of the charging permission flag and the setting information of the discharging permission flag, and uses each setting information to determine the constraint conditions of the optimization problem ((5b) ) is changed (see formula). According to this configuration, the EVGW 33 can change the calculated output target value according to the setting of the EV driving mode. For example, if the emergency power mode that does not permit charging is set, the EVGW 33 prevents the output target value from reaching the charging target value according to the constraint condition of equation (5b) above, The car 32 is not charged. In addition, when the quick charging mode that does not permit discharging is set, the EVGW 33 prevents the output target value from becoming the discharge target value according to the constraint condition of equation (5b) above, and the EV GW 33 causes the EV charger/discharger 31 to The automobile 32 is not discharged. Therefore, the EVGW 33 can instruct the EV charger/discharger 31 to control the charging and discharging of the electric vehicle 32 corresponding to the set EV driving mode according to the constraints (formula (5b) above) according to the set EV driving mode. .

In the power system S1, the EVGW 33 executes a discharging prohibition process and does not cause the electric vehicle 32 to discharge when the charging rate of the electric vehicle 32 becomes equal to or lower than the first threshold value. Specifically, when the charging rate of the electric vehicle 32 is below the first threshold value, the EVGW 33 sets the output target value even if the calculated output target value is a discharge target value for discharging the electric vehicle 32. Then, a control command is generated using the corrected target value (for example, 0 kW). According to this configuration, when the charging rate of the electric vehicle 32 becomes equal to or lower than the first threshold value, the EVGW 33 can instruct the EV charger/discharger 31 not to discharge the electric vehicle 32. A situation in which the electric vehicle 32 becomes completely unable to move due to overdischarge of the electric vehicle 32 is undesirable. For example, in the emergency power supply mode, if the charging rate of each electric vehicle 32 reaches the lower limit and it cannot be moved, it will not be possible to connect other electric vehicles and supply power to the important load (power load 42). Therefore, the EVGW 33 can suppress overdischarge of the electric vehicle 32 by not discharging the electric vehicle 32 when the charging rate of the electric vehicle 32 is equal to or lower than the first threshold value.

In the power system S1, the EVGW 33 executes a forced discharge process to forcibly charge the electric vehicle 32 when the charging rate of the electric vehicle 32 becomes equal to or less than the second threshold value. When the electric vehicle 32 is connected to the EV charger/discharger 31, the electric power of the electric vehicle 32 may be gradually discharged due to, for example, auxiliary equipment loss of the EV charger/discharger 31. Therefore, even if discharging of the electric vehicle 32 is prohibited by the discharge prohibition process, the charging rate of the electric vehicle 32 may decrease. Therefore, each EVGW 33 can suppress overdischarge of the electric vehicle 32 by executing forced charging processing. FIG. 4 shows changes in the charging rate of the electric vehicle 32 when the forced charging process is executed. It is assumed that the electric vehicle 32 is discharging until time t1. Until time t1, the charging rate of the electric vehicle 32 gradually decreases due to discharging of the electric vehicle 32. Then, at time t1, the charging rate of the electric vehicle 32 becomes equal to or less than the first threshold value, and the discharge prohibition process is started. Even if the discharge prohibition process is started, the charging rate of the electric vehicle 32 gradually decreases due to the auxiliary equipment loss of the EV charger/discharger 31, as described above. Thereafter, at time t2, the charging rate of the electric vehicle 32 becomes equal to or lower than the second threshold, and then the forced charging process is started. Through this forced charging process, the electric vehicle 32 is charged, and the charging rate of the electric vehicle 32 gradually increases. Then, at time t3, the charging rate of the electric vehicle 32 becomes equal to or higher than the forced charging end threshold, so the forced charging process ends. At time t3, the charging rate of electric vehicle 32 is still below the first threshold value. At this time, if the output target value does not reach the charging target value, the discharging prohibition process is performed again. In this manner, the forced charging process prevents the charging rate of the electric vehicle 32 from becoming less than the second threshold value, so it is possible to prevent a situation where the electric vehicle 32 becomes unable to move due to overdischarge.

In the electric power system S1, the reception unit 331 of the EVGW 33 receives operation/stop flag setting information from the processing device A1 and operation enable/disable flag setting information from the EV charger/discharger 31. The command unit 334 of the EVGW 33 generates a run/stop command based on the setting information of the run/stop flag and the setting information of the drive permission flag. The transmitter 335 of the EVGW 33 transmits the operation/stop command to the EV charger/discharger 31. When the EV charger/discharger 31 receives a run/stop command, it performs charging/discharging of the electric vehicle 32 according to the received run/stop command if the command value is "1" (driving command), and then returns the command value to "0". In the case of (stop command), charging and discharging of the electric vehicle 32 is stopped. Thereby, the EVGW 33 can stop the operation of the EV charger/discharger 31 when the EV charger/discharger 31 is in an inoperable state or when a stop instruction is given from the processing device A1.

In the power system S1, the EVGW 33 takes into account the charging rate (SoC) of the electric vehicle 32 by setting S _SW in equations (7) to (9) above to "1" when calculating the output target value. ing. According to this configuration, when calculating the output target value by the EVGW 33, the same guidance command value is corrected based on the charging rate of the electric vehicle 32. As a result, for example, the EV charger/discharger 31 to which an electric vehicle 32 with a lower charging rate is connected has a larger charging amount than other EV chargers/dischargers 31 and a smaller discharge amount than other EV chargers/dischargers 31. Become. FIG. 5 shows the results of simulating changes in the output target value and changes in the charging rate when the charging rate of the electric vehicle 32 is considered. In the simulation, the effect when three electric vehicles 32 with different initial charging rates were connected was verified. Note that in this simulation, it is assumed that the discharging prohibition process and the forced charging process are not executed. 5(a) shows the change in the output target value calculated by each EVGW 33, and FIG. 5(b) shows the change in the charging rate of each electric vehicle 32. The same guidance command value is transmitted to each EVGW 33. In FIGS. 5(a) and 5(b), the solid line indicates the results for the electric vehicle 32 with an initial charging rate of 50%, and the broken line indicates the results for the electric vehicle 32 with the initial charging rate of 70%. , the dash-dotted line shows the results for the electric vehicle 32 with an initial charging rate of 80%. Since the initial charging rate of the electric vehicle 32 shown by the solid line is smaller than the initial charging rates of the other electric vehicles 32, the output target value is smaller than the other output target values, as shown in FIG. 5(a). This indicates that the electric vehicle 32, whose initial charging rate is 50%, has a relatively large amount of charge when charging, and a relatively small amount of discharge when discharging. On the other hand, as shown in FIG. 5(b), since the initial charging rate of the electric vehicle 32 indicated by the dashed line is higher than the initial charging rate of the other electric vehicles 32, as shown in FIG. 5(a), The output target value is larger than other output target values. This indicates that the electric vehicle 32, which has an initial charging rate of 80%, has a relatively small amount of charge during charging and a relatively large amount of discharge when discharging. As a result, as shown in FIG. 5(b), the charging rates of the three electric vehicles 32, which were unbalanced in the initial state, gradually converge to the same level, and the difference in charging rates becomes smaller. I understand. Therefore, since the EVGW 33 changes the charging amount and the discharging amount depending on the charging rate of the electric vehicle 32, even when the power system S1 includes a plurality of electric vehicles 32, efficient power control cannot be performed. can.

In the power system S1, each EVGW 33 checks the setting information of the discharge permission flag received from the processing device A1, and when the discharge permission flag has a flag value of "1" (discharge permission), it notifies the EV charger/discharger 31 to that effect. is being sent to. Thereby, the possibility that the electric vehicle 32 will be discharged can be notified, so the user can know that there is a possibility that the electric vehicle 32 will be discharged. For example, the user may want to charge the electric vehicle 32 but not discharge the electric vehicle 32 due to various circumstances. At this time, the user can know that there is a possibility of discharge, so for example, by setting the peak cut discharge permission flag of the EVGW 33 to the flag value "0" (discharge prohibited during peak cut), You can prevent it from discharging.

In the power system S1, when an abnormality occurs in the processing device A1, a first abnormality flag is transmitted from the EVGW 33 to the EV charger/discharger 31. Thereby, the EV charger/discharger 31 can detect that an abnormality has occurred in the processing device A1 based on the first abnormality flag, so it can stop charging and discharging the electric vehicle 32 or notify the user. Further, in the power system S1, when an abnormality occurs in the EVGW 33, a second abnormality flag is transmitted from the EVGW 33 to the EV charger/discharger 31. Thereby, the EV charger/discharger 31 can detect that an abnormality has occurred in the EVGW 33 based on the second abnormality flag, so it can stop charging and discharging the electric vehicle 32 or notify the user.

In the present embodiment, a case is shown in which the charging permission flag and the discharging permission flag are set in the processing device A1, but the present invention is not limited to this, and even if a charging and discharging permission flag combining these into one is set. good. In this case, for example, if both charging and discharging are prohibited, the charge/discharge permission flag is set to a value of "0", and if only charging is permitted (discharging is prohibited), the charge/discharge permission flag is set to a flag value of "1". When only discharging is permitted (charging is prohibited), the charging/discharging permission flag is set to a flag value of "2", and when both charging and discharging are permitted, the charging/discharging permission flag is set to a flag value of "3". When the charging/discharging permission flag has a flag value of "0", this corresponds to when the charging permission flag has a flag value of "0" and the discharging permission flag has a flag value of "0". When the charging/discharging permission flag has a flag value of "1", this corresponds to when the charging permission flag has a flag value of "1" and the discharging permission flag has a flag value of "0". When the charging/discharging permission flag has a flag value of "2", this corresponds to when the charging permission flag has a flag value of "0" and the discharging permission flag has a flag value of "1". When the charging/discharging permission flag has a flag value of "3", this corresponds to when the charging permission flag has a flag value of "1" and the discharging permission flag has a flag value of "1".

In this embodiment, the types of control targets controlled by the plurality of power control units B1 include the solar battery 12 controlled by the PV output control unit 10 (solar solar PCS 11) and the storage battery output control unit 20 (storage battery PCS 21). Although a case has been shown in which the storage battery 22 to be controlled and the electric vehicle 32 to be controlled are included in the EV output control unit 30 (EV charger/discharger 31), the present invention is not limited thereto. For example, it may further include one or both of a load output control section that controls the power load 42 and a generator output control section that controls the generator. Further, in this embodiment, the plurality of power control units B1 included the PV output control unit 10, but the PV output control unit 10 may not be included.

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

S1: Power system, A1: Processing device, B1: Power control unit, 30: EV output control unit, 31: EV charger/discharger, 32: Electric vehicle, 33: EV gateway (EVGW), 331: Receiving unit, 332 :Flag setting unit, 333: Calculation unit, 334: Command unit, 335: Transmission unit, D: Power system

Claims (5)

Calculate the induction command value to make the connection point power at the connection point between the charger/discharger that charges and discharges the electric vehicle based on the received control command, the power system including the charger/discharger, and the power grid to the target power. A relay device that relays communication with a processing device that performs processing,
a receiving unit that receives the guidance command value and driving mode setting information in which whether or not the electric vehicle can be charged and whether or not the electric vehicle can be discharged is set from the processing device;
a calculation unit that calculates a target value of output power of the charger/discharger based on an optimization problem using the guidance command value and the setting information of the operation mode;
a command unit that generates the control command based on the target value and the setting information of the operation mode;
a transmitter that transmits the control command to the charger/discharger;
A relay device comprising: The setting information of the driving mode includes setting information of a charging permission flag indicating whether charging is possible and setting information of a discharging permission flag indicating whether discharging is possible,
The optimization problem includes constraints,
The calculation unit changes the constraint condition based on setting information of the charging permission flag and setting information of the discharging permission flag.
The relay device according to claim 1. The receiving unit receives the charging rate of the electric vehicle from the charger/discharger,
The command unit generates the control command so that the charger/discharger does not discharge the electric vehicle when the charging rate is less than or equal to a first threshold value even if the target value is a value indicating discharging.
The relay device according to claim 2. The command unit generates the control command to cause the charger/discharger to charge the electric vehicle when the charging rate is equal to or less than a second threshold smaller than the first threshold.
The relay device according to claim 3. The receiving unit further receives operation/stop flag setting information from the processing device, and receives operation enable/disable flag setting information from the charger/discharger,
The operation/stop flag is a flag value indicating a driving instruction for instructing the charger/discharger to perform charging/discharging of the electric vehicle, or a driving stop flag for instructing the charger/discharger to stop charging/discharging the electric vehicle. one of the flag values indicating
The drivability flag is a flag value indicating that the charger/discharger is in a state where it is possible to charge and discharge the electric vehicle, indicating that it is drivable, or a state in which the charger/discharger is in a state in which it is not possible to charge and discharge the electric vehicle. One of the flag values indicating that operation is not possible is set,
The command unit issues a run/stop command that instructs whether or not to cause the charger/discharger to charge/discharge the electric vehicle based on the setting information of the run/stop flag and the setting information of the drive permission flag. generate,
The transmitter further transmits the operation/stop command to the charger/discharger,
The relay device according to any one of claims 1 to 4.

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