JP5456002B2 - Electric vehicle charging / discharging system - Google Patents

Description

  The present invention relates to a charging / discharging system for a vehicle battery.

  In recent years, the development of a next-generation power network called “smart grid” that incorporates automatic control of power supply and demand in the power network has attracted attention. In the smart grid, power demand and supply are optimized (equilibrium) by controlling the flow of power in the power network not only from the supply side but also from the demand side.

  For example, batteries (storage batteries) of electric vehicles (for example, electric vehicles (EV) and plug-in hybrid vehicles (PHV)) owned by households are smoothed by reducing the peak of power demand. It can be used as a buffer for That is, the peak of power demand is reduced by using the electric power of the vehicle battery charged in the time zone with low power demand at the time of peak power demand. In general, since electricity charges are set cheaply at times such as midnight when electricity demand is low, the electricity charges of each household can be saved. The smart grid automatically controls such a power flow.

  In the power grid managed by the smart grid, it is assumed that not only charging of the battery of the vehicle (power supply from the house to the vehicle) but also discharging of the battery (power supply from the vehicle to the house) is actively performed. This power flow is managed by an energy management system (HEMS) installed in each consumer. HEMS puts power generation facilities such as photovoltaic power generation (PV) equipment, large-scale power load facilities such as electric water heaters and air conditioners, and power storage facilities such as vehicle batteries under management. They are controlled so that power demand is smoothed, thereby balancing power supply and demand so that less power is purchased from the power company.

  In recent years, attempts have been made to broaden the scope of these technologies from home and improve the environmental performance of the entire society (for example, Patent Document 1 below). In addition, a community energy management system (Community Energy Management System) aimed at smoothing power demand and balancing power supply and demand in city and city units, including neighboring customers (for example, neighbors and neighboring factories and buildings). Experiments and concepts for deploying Management System (CEMS) in commercial power grids are also being conducted.

  When smoothing power demand in city units or city units, the power generated by the power generation facilities in the home and the power discharged by the power storage facilities are released to the commercial power network (system) outside the home, and the same commercial It is assumed that it will be consumed by other consumers connected to the power grid. Such a flow of power released from the home to the commercial power grid is called “reverse power flow”.

  When discharging (discharging) power from the home to the commercial power network, an electric power company that manages the commercial power network in advance does not adversely affect the electrical appliances of other consumers connected to the same commercial power network. A mechanism for monitoring and controlling the discharge power is required so as not to deviate from the defined “regulation value regarding discharge power (reverse power flow)” (hereinafter referred to as “discharge regulation value”).

JP 2010-81722 A

  The discharge regulation values set by the electric power company mainly include the voltage upper and lower limit values and frequency upper and lower limit values of discharge power, the presence / absence of a discharge stop function at the time of a power failure on the system side, and the return permission time at the time of power failure recovery . However, these values are not necessarily the same even in a commercial power network managed by the same power company. For example, the distance from the power supply station to the distribution network of the commercial power network, or the transformation provided in the distribution network. It is necessary for the electric power company to make adjustments and settings for each commercial power network in consideration of the setting status of the equipment and the load state of the customer in the distribution network.

  When a battery of an electric vehicle is used as a power storage facility in the home, the electric vehicle is driven and moved by a user, and thus the battery is not always charged and discharged at the same place. For example, in a consumer at a destination of an electric vehicle, when discharging from the electric vehicle to the commercial power grid, the user uses the discharge power format (voltage or frequency) according to the discharge regulation value determined by the commercial power network. It may be necessary to reset the set value (hereinafter referred to as “discharge set value”). Therefore, when the battery of an electric vehicle is used as a power storage facility, the burden on the user increases.

  In addition, if the user of the electric vehicle makes a mistake in setting the discharge setting value, the electric vehicle discharges electric power having a voltage and frequency that deviates from the discharge regulation value to the commercial power grid. As well as other commercial customers connected to the same commercial power grid and its distribution network.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a charge / discharge system in which a user does not need to reset a discharge set value of an electric vehicle.

An electric vehicle charging / discharging system according to the present invention includes an electric vehicle having a battery, and a charging / discharging device connected to a commercial power network and charging / discharging the battery from the outside of the electric vehicle. When the battery is discharged by the charge / discharge device, the power conversion device converts the power of the battery into a power format of the commercial power network and outputs the power to a power line connected to the commercial power network in the charge / discharge device, and the power conversion device And a first controller that determines a discharge setting value, which is a setting value in the form of discharge power to be output to the power line, based on information relating to the commercial power network , and the charge / discharge device starts discharging the battery A second controller that transmits a discharge regulation value of the commercial power grid to the first controller before the first controller Based on the discharge regulation value, and determines the discharge setting.

  According to the present invention, when the battery of the electric vehicle is discharged using the charge / discharge device, the discharge set value corresponding to the discharge regulation value of the commercial power network to which the charge / discharge device belongs is automatically set in the power conversion device of the electric vehicle. Is set automatically. For this reason, even when the battery is discharged at the destination of the electric vehicle, the user can discharge the battery in a format that conforms to the discharge regulation value of the commercial power grid without resetting the discharge setting value. Therefore, it is possible to contribute to smoothing the power demand and balancing the power supply and demand in the commercial power network in each place, and it is possible to prevent the operation of the consumer electronics belonging to each commercial power network from being affected.

It is the block diagram which showed the outline of the electric power network managed by the smart grid. 1 is a configuration diagram of a charge / discharge system for an electric vehicle according to Embodiment 1. FIG. 4 is a flowchart showing an operation at the time of connection between the electric vehicle and the charge / discharge device in the charge / discharge system for the electric vehicle according to the first embodiment. FIG. 4 is a configuration diagram of a charge / discharge system for an electric vehicle according to a second embodiment. 6 is a flowchart showing an operation at the time of connection between an electric vehicle and a charge / discharge device in the charge / discharge system of the electric vehicle according to the second embodiment.

<Embodiment 1>
FIG. 1 is a configuration diagram showing an outline of a power network managed by a smart grid including a charge / discharge system for an electric vehicle according to the present invention.

  The charge / discharge system includes an electric vehicle 10 and a charge / discharge device 20 installed in a house 30. The house 30 is assumed to be the home of the user of the electric vehicle 10. The house 30 and other customers 41 in the vicinity thereof are connected to the same commercial power network 43, and the power generated at the power plant 42 is supplied through the commercial power network 43 under the management of a specific power company. Yes.

  The electric vehicle 10 is equipped with a battery 11 that can be charged / discharged through the charging / discharging device 20, and also functions as a power storage facility. A HEMS 31 is installed in the house 30. The HEMS 31 includes a photovoltaic power generation device (PV) 32 that is a power generation facility in the house 30, an electric vehicle 10 as a power storage facility connected to the charge / discharge device 20, and an air conditioner that is a power load facility that consumes relatively large power. Communicate with a device 33 such as an electric water heater (hereinafter referred to as “electric power load 33”) and control them to smooth the power demand in the house 30, thereby achieving a balance of power supply and demand.

  The commercial power network 43 is provided with a CEMS 44 that manages the flow of power between the commercial power network 43 and the houses 30 and other customers 41 connected to the commercial power network 43. When surplus power is generated in the house 30, the HEMS 31 of the house 30 releases the surplus power to the commercial power network 43, but the operation is performed based on a command of the CEMS 44. The electric power released from the house 30 to the commercial power grid 43 is supplied to other consumers 41 under the control of the CEMS 44, and as a result, the electric power demand in the entire region to which the house 30 and other customers 41 belong is smoothed. And balance of power supply and demand.

  FIG. 2 is a configuration diagram of a charge / discharge system for an electric vehicle according to the first embodiment. In the figure, elements having the same functions as those shown in FIG. In FIG. 2, among the lines connecting the blocks, a thick line indicates a power line, and a thin line indicates a communication line. However, although the connection cable 22 of the charging / discharging device 20 to be connected to the electric vehicle 10 is represented by a thick line, it is assumed that both the power line and the communication line are provided. Also in the actual operation form, the connection cable of the charge / discharge device is generally provided with both a communication line and a power line.

  Based on FIG. 2, the structure of the charging / discharging system of the electric vehicle which concerns on this Embodiment is demonstrated. In addition, since this invention is related to charging / discharging of the battery 11 of the electric vehicle 10, description of the elements (for example, the part regarding travel control) which is not directly related to charging / discharging of the battery 11 is abbreviate | omitted.

  The charging / discharging system of the present embodiment includes electric vehicle 10, house 30 and charging / discharging device 20 installed therein. The electric vehicle 10 includes a battery 11, a first controller 12, a power conversion device 13, a system power monitoring device 14, and a connector 15. The battery 11 stores electric power serving as a power source for running the electric vehicle 10 and also functions as a power storage facility. The connector 15 includes a charging / discharging terminal for performing power supply / demand (charging and discharging) from the charging / discharging device 20 to the battery 11 and a communication terminal for performing communication with the charging / discharging device 20. The connector 15 may be for quick charging or for normal charging.

  The power conversion device 13 is inserted in series in the power line between the battery 11 and the connector 15 and converts the form (voltage and frequency) of the power flowing through the power line. For example, when the battery 11 is charged, the power format of the commercial power network 43 (for example, AC power with a voltage of 100 V and a frequency of 60 Hz) is converted into the power format of the battery 11 (for example, DC power with a voltage of 330 V), and vice versa. Perform conversion. However, when the battery 11 is discharged, particularly when the electric power stored in the battery 11 is discharged to the commercial power network 43, the power conversion device 13 outputs the power in the form according to the discharge regulation value of the commercial power network 43 to the connector 15 side. There is a need to.

  When the electric vehicle 10 is connected to the charging / discharging device 20, the system power monitoring device 14 checks the state of power (system power) of the commercial power network 43 (measurement of voltage and frequency). The measurement result by the system power monitoring device 14 is sent to the first controller 12 as a power state signal VW. The contents of the power state signal VW may include, for example, signals such as flags indicating the state (normal / abnormal / power failure) of the commercial power network 43 in addition to the measured values of the voltage and frequency of the commercial power network 43.

  The first controller 12 is connected to the battery 11, the power conversion device 13, the system power monitoring device 14 and the connector 15 through a communication line, and monitors and controls the battery 11, the power conversion device 13 and the system power monitoring device 14. Then, communication with the charging / discharging device 20 (second controller 23 described later) is performed through the connector 15.

  On the other hand, the charging / discharging device 20 includes a connection cable 22, a plug 21 provided at the tip thereof, and a second controller 23. The plug 21 is for connecting the connection cable 22 to the connector 15 of the electric vehicle 10, and, similar to the connector 15, a charge / discharge terminal for supplying and supplying power to the battery 11 and the electric vehicle 10. And a communication terminal for performing communication.

  The second controller 23 is connected to the HEMS 31 of the house 30 via a communication line. When the plug 21 of the charging / discharging device 20 is connected to the connector 15 of the electric vehicle 10, the communication line in the electric vehicle 10 and the communication line in the charging / discharging device 20 are connected, and the second controller 23 and the first Mutual communication with the controller 12 becomes possible.

  Further, the second controller 23 holds the discharge regulation value DR of the commercial power network 43 to which the charging / discharging device 20 is connected in an internal storage area (not shown). The value of the discharge regulation value DR held by the second controller 23 is a value determined by the electric power company, and is input by the installer or a person concerned with the electric power company when the charging / discharging device 20 is installed. The contents of the discharge regulation value DR include, for example, the voltage, frequency, voltage upper and lower limit values, frequency upper and lower limit values, presence / absence of a discharge stop function at the time of power failure, and return permission time at the time of power failure recovery Etc. are included.

  The power line in the charging / discharging device 20 is connected in parallel with the solar power generation device 32 and the power load 33 of the house 30 and is connected to the commercial power network 43. When the plug 21 of the charging / discharging device 20 is connected to the connector 15 of the electric vehicle 10, the power line in the electric vehicle 10 and the charging / discharging device 20 are connected, and the charging / discharging device 20 is connected to the battery 11 through the power line. Power can be exchanged with the house 30 (solar power generation device 32, power load 33, and commercial power network 43).

  In this charge / discharge system, the HEMS 31 controls the operation of the solar power generation device 32 and the power load 33 in the house 30 according to the charge / discharge plan and the instruction from the user for balancing the power demand. In the state where the electric vehicle 10 is connected to the charging / discharging device 20, the charging / discharging device 20 is controlled, and the battery 11 supplies sufficient power for traveling according to the use plan of the electric vehicle 10 registered in advance. Or the battery 11 is used as one of the power storage facilities of the house 30 (a buffer for smoothing power demand).

  The charge / discharge system according to the present embodiment is characterized by an operation when charging / discharging of the battery 11 is started. The charging / discharging operation | movement of the battery 11 in the said charging / discharging system is demonstrated using the flowchart of FIG.

  First, when the electric vehicle 10 is connected to the charging / discharging device 20, the power line in the electric vehicle 10 is connected to the commercial power network 43, so that the grid power monitoring device 14 determines the power state (voltage and frequency) of the commercial power network 43. Can be monitored.

  Thereafter, when charging / discharging of the battery 11 of the electric vehicle 10 is performed by the charge / discharge device 20, the HEMS 31 sends a charge / discharge command signal CCH to the second controller 23 of the charge / discharge device 20 (step S101). The contents of the charge / discharge command signal CCH include a flag indicating whether the charge command or the discharge command is performed, and information on the amount of power to be charged / discharged.

  When the second controller 23 receives the charge / discharge command signal CCH from the HEMS 31, the charge / discharge command signal CC2 and the discharge regulation value DR of the commercial power network 43 held in its own storage area are sent to the first controller 12. Are transmitted (step S102).

  Similar to the charge / discharge command signal CCH, the content of the charge / discharge command signal CC2 includes a flag indicating whether the command is a charge command or a discharge command, and information on the amount of power to be charged / discharged. The content of the charge / discharge command signal CC2 and the content of the charge / discharge command signal CCH may be exactly the same. The contents of the discharge regulation value DR include the voltage, frequency, upper and lower limit values of the voltage, the upper and lower limits of the frequency, the presence or absence of a discharge stop function at the time of a power failure, and the return permission time at the time of power failure recovery. Etc. are included.

  When the first controller 12 receives the charge / discharge command signal CC2 and the discharge regulation value DR, the first controller 12 acquires a power state signal VW representing the power state (voltage and frequency) of the commercial power network 43 from the system power monitoring device 14 (step). S103). Then, based on the discharge regulation value DR and the power state signal VW, the discharge setting value DS to be set in the power converter 13 is determined.

  The discharge set value DS is a set value for defining the format (voltage and frequency) of the power output from the power conversion device 13 when discharging the battery 11. The power converter 13 determines the discharge setting value DS so that the power output from the power converter 13 does not deviate from the discharge regulation value DR. The power state signal VW may be used only for confirming the power state of the commercial power network 43, but may be taken into consideration when determining the discharge set value DS. The discharge setting value DS can be determined to a more appropriate value by taking into consideration the power state signal VW that is an actual measurement value of the power state of the commercial power network 43.

  When the discharge setting value DS is determined, the first controller 12 transmits the discharge setting value DS and the charge / discharge command signal CC1 to the power conversion device 13 (step S104). Similar to the charge / discharge command signal CC2, the contents of the charge / discharge command signal CC1 include a flag indicating whether the command is a charge command or a discharge command, and information on the amount of power to be charged / discharged. The content of the charge / discharge command signal CC1 and the content of the charge / discharge command signal CC2 may be exactly the same.

  Upon receiving the discharge setting value DS and the charge / discharge command signal CC1, the power conversion device 13 sets the discharge setting value DS as a parameter of the power format output when the battery 11 is discharged (step S105).

  Thereafter, the power conversion device 13 charges or discharges the battery 11 in accordance with the content of the charge / discharge command signal CC1 (step S106). For example, when the charge / discharge command signal CC <b> 1 is a charge command, the power conversion device 13 converts the power of the commercial power network 43 into the power format of the battery 11 and supplies it to the battery 11. Conversely, when the charge / discharge command signal CC <b> 1 is a discharge command, the power conversion device 13 converts the power of the battery 11 into the power format of the commercial power network 43 and outputs it to the charge / discharge device 20. At this time, since the power converter 13 is set with the discharge set value DS determined based on the discharge set value DS and the power state signal VW, the power converter 13 receives the discharge set value DS (commercial power network 43). Power is output in a format that complies with the discharge regulation value.

  As described above, in the charge / discharge system according to the present embodiment, the discharge restriction value DR and the grid power monitoring acquired by the first controller 12 of the electric vehicle 10 from the second controller 23 before the battery 11 is charged / discharged. Based on the power state signal VW acquired from the device 14, the discharge set value DS is automatically determined and set in the power conversion device 13. Therefore, the electric vehicle 10 outputs power in a format that conforms to the discharge regulation value of the commercial power network 43. Even if the power is discharged to the commercial power network 43, the power load 33 of the house 30 is, of course, It is prevented that the operation of the electrical appliances of other consumers 41 is adversely affected. In addition, since it is not necessary for the user of the electric vehicle 10 to reset the discharge set value, the burden on the user is not increased, and a setting error of the discharge set value can be prevented.

  Furthermore, since the charging / discharging device 20 holds the discharge regulation value DR of the commercial power network 43, even when the electric vehicle 10 is connected to the charging / discharging device 20 belonging to another commercial power network, for example, 1 controller 12 can always acquire an appropriate charge regulation value. Therefore, even if the electric vehicle 10 is connected to the arbitrary charging / discharging device 20 of a movement destination, a user does not reset a discharge setting value.

  In the above description, the second controller 23 holds the discharge restriction value DR of the commercial power grid 43. However, when the electric vehicle 10 is connected to the charge / discharge device 20, the discharge restriction value DR is set to the first controller. If it can transmit to 12, the other element in the charging / discharging apparatus 20 or the house 30 may hold | maintain. For example, a storage area for holding the discharge restriction value DR may be provided in the HEMS 31, and the HEMS 31 may transmit the discharge restriction value DR together with the charge / discharge command signal CCH to the second controller 23.

  Further, in the present embodiment, the first controller 12 determines the discharge set value DS based only on the discharge regulation value DR or based on the discharge regulation value DR and the power state signal VW, but based on only the power state signal VW. It may be determined. In this case, it is not necessary for the charge / discharge device 20 to maintain the discharge set value DS, and the configuration of the charge / discharge device 20 can be simplified. In any method, if the first controller 12 can automatically determine the discharge set value DS that does not deviate from the discharge regulation value of the commercial power grid 43, the same effect as described above can be obtained.

<Embodiment 2>
FIG. 4 is a configuration diagram of a charge / discharge system for an electric vehicle according to the second embodiment. In the figure, elements having the same functions as those shown in FIG. 2 are denoted by the same reference numerals, and description thereof is omitted.

  In the charge / discharge system, the electric vehicle 10 includes a switch 16 that switches connection / disconnection between the power line in the electric vehicle 10 and the connector 15. The operation of the switch 16 is controlled by a switch control signal SW output from the first controller 12.

  The first controller 12 normally turns off the switch 16, but turns on when the electric vehicle 10 is connected to the charge / discharge device 20 and the discharge set value DS is set in the power conversion device 13. The power line of the electric vehicle 10 is connected to the commercial power network 43.

  FIG. 5 is a flowchart showing the operation of the charge / discharge system according to the present invention. Based on the figure, the charging / discharging operation | movement of the battery 11 in the said charging / discharging system is demonstrated. The contents of charge / discharge command signals CCH, CC1, CC2 and discharge regulation value DR shown below are the same as those in the first embodiment.

  In the present embodiment, immediately after electric vehicle 10 is connected to charging / discharging device 20, switch 16 is in the off state. Therefore, in that state, the power line in the electric vehicle 10 is not connected to the commercial power network 43, and the grid power monitoring device 14 cannot monitor the power state of the commercial power network 43.

  When the electric vehicle 10 is connected to the charging / discharging device 20, when the charging / discharging device 20 performs charging or discharging of the battery 11 of the electric vehicle 10, the HEMS 31 is connected to the second controller 23 of the charging / discharging device 20. A charge / discharge command signal CCH is sent (step S201). When the second controller 23 receives the charge / discharge command signal CCH from the HEMS 31, the charge / discharge command signal CC2 and the discharge regulation value DR of the commercial power network 43 held in its own storage area are sent to the first controller 12. Are transmitted (step S202).

  When the first controller 12 receives the charge / discharge command signal CC2 and the discharge regulation value DR, the first controller 12 determines a discharge setting value DS to be set in the power converter 13 based on the discharge regulation value DR. The discharge set value DS is a set value for determining the type (voltage and frequency) of power output from the power converter 13 when discharging the battery 11. The power converter 13 determines the discharge setting value DS so that the power output from the power converter 13 does not deviate from the discharge regulation value DR. However, unlike the first embodiment, the power state signal VW is not considered here.

  When the discharge set value DS is determined, the first controller 12 transmits the discharge set value DS to the power conversion device 13 (step S203). When receiving the discharge setting value DS, the power conversion device 13 sets the discharge setting value DS as a parameter of the power format output when the battery 11 is discharged (step S204).

  When the discharge set value DS is set in the power converter 13, the first controller 12 sends a switch control signal SW to the switch 16 to turn on the switch 16 (step S205). As a result, the power line in the electric vehicle 10 is connected to the power line of the commercial power network 43 (step S206). At this time, the system power monitoring device 14 confirms the power state of the second controller 23 (measurement of voltage and frequency) and sends a power state signal VW indicating the measurement result to the first controller 12 (step S207). .

  The first controller 12 transmits the charge / discharge command signal CC1 to the power converter 13 after confirming the power state of the commercial power network 43 based on the power state signal VW (step S208). At this time, the first controller 12 may newly determine the discharge setting value DS based on the power state signal VW and transmit it to the second controller 23.

  Thereafter, the power conversion device 13 charges or discharges the battery 11 in accordance with the content of the charge / discharge command signal CC1 (step S209). For example, when the charge / discharge command signal CC <b> 1 is a charge command, the power conversion device 13 converts the power of the commercial power network 43 into the power format of the battery 11 and supplies it to the battery 11. Conversely, when the charge / discharge command signal CC <b> 1 is a discharge command, the power conversion device 13 converts the power of the battery 11 into the power format of the commercial power network 43 and outputs it to the charge / discharge device 20. At this time, since the discharge setting value DS determined based on the discharge setting value DS is set in the power converter 13, the discharge setting value DS (discharge regulation value of the commercial power network 43) is set from the power converter 13. Power is output in a format that conforms to

  Also in the charge / discharge system of the present embodiment, the same effect as in the first embodiment can be obtained. In addition, in this embodiment, after the discharge set value DS is set in the power converter 13, the switch 16 is turned on and the power line in the electric vehicle 10 is connected to the commercial power network 43. Therefore, the power converter 13 Thus, it is possible to reliably prevent electric power from being discharged from the electric vehicle 10 to the commercial power grid 43 in a state where the appropriate discharge set value DS is not set.

  In Embodiment 1, 2, since the charging / discharging apparatus 20 has shown the example installed in the house 30 of an individual (user of the electric vehicle 10), although the charging / discharging apparatus 20 is put under management of HEMS31, The installation location of the charging / discharging device 20 is not limited to a house. For example, when the charging / discharging device 20 is installed in a factory, the charging / discharging device 20 is placed under the management of a factory energy management system (FEMS) that smoothes the power demand in the factory. Similarly, when the charging / discharging device 20 is installed in a parking lot of a building, the charging / discharging device 20 is placed under the management of a building energy management system (BEMS). Furthermore, when the charging / discharging device 20 is used as a public charging / discharging spot, the charging / discharging device 20 is directly controlled by the CEMS 44. Even when the charging / discharging device 20 is controlled by FEMS, BEMS, or CEMS, the same effect as the present embodiment can be obtained.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

  DESCRIPTION OF SYMBOLS 10 Electric vehicle, 11 Battery, 12 1st controller, 13 Power converter, 14 System power monitoring apparatus, 15 Connector, 16 Switch, 20 Charging / discharging apparatus, 21 Plug, 22 Connection cable, 23 2nd controller, 24 Memory Area, 30 houses, 31 HEMS, 32 solar power generation equipment, 33 power load, 41 customer, 42 power plant, 43 commercial power network, 44 CEMS.

Claims (3)

An electric vehicle having a battery;
A charging / discharging device connected to a commercial power network and charging / discharging the battery from the outside of the electric vehicle,
The electric vehicle is
A power converter that converts the power of the battery into a power format of the commercial power network and outputs the power to a power line connected to the commercial power network in the charge / discharge device when the battery is discharged by the charge / discharge device;
A first controller that determines a discharge setting value, which is a setting value in the form of discharge power that the power converter outputs to the power line, based on information about the commercial power network ;
The charging / discharging device
A second controller for transmitting a discharge regulation value of the commercial power grid to the first controller before starting to discharge the battery;
The charging / discharging system for an electric vehicle, wherein the first controller determines the discharge set value based on the discharge regulation value . The electric vehicle is
Before starting to discharge the battery, further comprising a grid power monitoring device for checking the power state of the commercial power grid and transmitting a power state signal indicating the state to the first controller,
The first controller further determines the discharge setting value based on the power state signal.
The charging / discharging system of the electric vehicle of Claim 1. The electric vehicle is
A switch for connecting the power converter to the power line after the discharge set value is set in the power converter is further provided.
The charging / discharging system of the electric vehicle of Claim 1 or Claim 2.

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