JP2012228034A - Charge and discharge system between electric automobile and house - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charge and discharge system between an electric automobile and a house by utilizing a one-way AC/DC converter of the electric automobile parked adjacent to the house.SOLUTION: A charge and discharge system comprises: a two-way AC/DC converter of which an AC side is connected to a commercial power of a house and a DC side is connected to a fast charge plug of an electric automobile; a first communication device for receiving an instruction from a power supplier; a first control device for controlling an operation direction of the two-way AC/DC converter on the basis of the instruction received by the first communication device; an on-vehicle battery; a one-way AC/DC converter of which a DC side is connected to the on-vehicle battery and an AC side is connected to a socket of the house; a second communication device for receiving an instruction from the power supplier; a second control device for controlling a conversion state of the one-way AC/DC converter on the basis of the instruction received by the second communication device.

Description

The present invention relates to a charging / discharging system between an electric vehicle and a house that charges the battery of the electric vehicle with a commercial AC power source from the house side via a power cable and discharges the battery of the electric car to a load in the house. is there.

  Patent document 1 is disclosing the example of the charging / discharging system between an electric vehicle and a house. An electric car is parked next to the house. Electric vehicles include plug-in hybrid vehicles and hybrid vehicles. On the other hand, the battery of the electric vehicle is charged using a commercial AC power source on the house side or private power generation, and on the other hand, the electric power stored in the battery of the electric vehicle is discharged to a house load or an external load.

  In the embodiment of Patent Document 1, when the power supply frequency or voltage of the system becomes unstable, the power storage means in the home or the electric vehicle, or both power storage means, according to a command from the power supplier In contrast, a system for changing a charging current or a discharging current is described.

JP 2008-141926 A

  Electric vehicles currently on the market are equipped with a one-way AC (Alternate Current) / DC (Direct Current) converter, and the battery of the electric vehicle is dedicated to charging. In order to construct the above-described system using the current system, it is necessary to be able to discharge from the battery of the electric vehicle to the system by alternating current.

It is almost impossible to change the AC / DC converter mounted on an electric vehicle from a one-way type to a two-way type by slightly improving the internal configuration. In the end, it is necessary to replace the bidirectional AC / DC converter, such as changing the diode to a switching element and making the control circuit new. The bidirectional AC / DC converter is overwhelmingly expensive than the unidirectional AC / DC converter.

  Since a battery such as a lithium battery mounted on an electric vehicle is accompanied by a chemical reaction, it is conceivable that the life of the battery may be shortened due to repeated charging / discharging with the system and fluctuations in charging current and discharging current. In particular, the life against repeated charge / discharge at a low temperature of 0 ° C. or lower or a high temperature exceeding 50 ° C. is affected. For this reason, it is difficult to charge an in-vehicle battery without damaging the battery life according to a charge instruction from the system when the vehicle is parked beside a house in midwinter or midsummer. Furthermore, it is difficult to determine how much current is appropriate for charging.

  The present invention has been made to solve the above-described problems, and uses a one-way AC / DC converter of an electric vehicle parked adjacent to a house to supply commercial power via a power cable. An object of the present invention is to obtain a charging / discharging system between an electric vehicle and a house, in which the battery of the electric vehicle is charged from the house side with an AC power supply or private power generation, and discharged from the battery of the electric vehicle to a house load or an external load.

The charging / discharging system between an electric vehicle and a house according to the present invention is a bidirectional AC / DC converter that is installed in a house, the AC side port is connected to commercial power of the house, and the DC side port is connected to a quick charge plug of the electric vehicle. And a first communication device that is installed in the house and receives a command from the power supply company, and controls the operation direction of the bidirectional AC / DC converter based on the command that is installed in the house and obtained by the first communication device. A first control device, an in-vehicle battery mounted on the electric vehicle, a one-way AC / DC converter mounted on the electric vehicle, the direct current side port being connected to the in-vehicle battery, and the alternating current side port being connected to the outlet of the house; A second communication device mounted on the electric vehicle for receiving a command from a power supplier, and a one-way AC / DC converter based on the command mounted on the electric vehicle and obtained by the second communication device. A second control device for controlling the state of conversion over data, but that has a.

  According to the charging / discharging system between the electric vehicle and the house according to the present invention, the rapid charging of the electric vehicle without changing the one-way AC / DC converter dedicated to charging the battery of the electric vehicle to the bidirectional AC / DC converter. It is possible to discharge from the battery of the car to a load in the house or an external load through the plug.

In addition, since a DC power cable is connected to charge and discharge with a large change in the current value between the electric vehicle and the house, it is possible to monitor the charge state and deterioration state of the battery from the change in the DC current and the DC voltage of the battery. it can. In addition, a normal charging AC power cable is used to control the current value when charging a substantially constant current value from the commercial AC power supply or private power generation to the battery of the electric vehicle. It becomes possible to carry out the discharge.

It is a block diagram which shows the charging / discharging system between the electric vehicle and house which concern on Embodiment 1 of this invention. It is a block diagram which shows the charging / discharging system between the electric vehicle which concerns on Embodiment 2 of this invention, and a house. It is a block diagram which shows the charging / discharging system between the electric vehicle which concerns on Embodiment 3 of this invention, and a house.

  Hereinafter, preferred embodiments of a charging / discharging system between an electric vehicle and a house according to the present invention will be described with reference to the drawings. In the present invention, charging / discharging between a house and an electric vehicle is performed with two power cables instead of one power cable.

Embodiment 1 FIG.
1 is a schematic diagram showing a charge / discharge system between an electric vehicle and a house according to Embodiment 1 of the present invention. The charging / discharging system 100 between the electric vehicle and the house is composed of an electric vehicle 1 and a house 2. The electric vehicle 1 and the house 2 are displayed separately by two-dot chain lines. During operation of the charge / discharge system, the AC power cable 5 for normal charging of the electric vehicle 1 is connected to an AC 100V or AC 200V outlet 7 for home use, and the DC power cable 8 for the house 2 is connected to the quick charging plug 6 of the electric vehicle 1. Connected. Hereinafter, in each figure, the same code | symbol shows the same or an equivalent part.

The house 2 includes a DC power cable 8, a bidirectional AC / DC converter 9, a home load 10, a modem (communication device) 13, a control device 14, and the like. Commercial power is drawn into the house 2 through the pole transformer 16 and the wattmeter 17 from the power supplier side. Commercial AC power is supplied to the in-home load 10 via an AC breaker 15 of AC100V or AC200V. The bidirectional AC / DC converter 9 has two connection ports (an AC side port 9a and a DC side port 9b). The AC side port 9 a is connected to the commercial power line, and the DC side port 9 b is connected to the DC power cable 8.

  The bidirectional AC / DC converter 9 can convert an AC input into a DC output, and can also convert a DC input into an AC output. The operation direction of the bidirectional AC / DC converter 9 is controlled by an instruction from the control device 14. For example, when the modem 13 receives a charging command from the power supplier, the bidirectional AC / DC converter 9 converts an AC input into a DC output, and charging through the quick charging plug 6 is performed. The DC power cable 8 is attached to the house 2 and is connected to the quick charging plug 6 provided in the electric vehicle 1 when necessary. A power cable for quick charging used in a charging stand or the like flows a large current in a short time of about 10 minutes, so a thick cable is used. However, it is not realistic to provide such a thick power cable in a home. . In the charge / discharge system according to the present application, a power cable having a normal thickness can be used as the DC power cable 8.

The bidirectional AC / DC converter 9 performs charging / discharging with a small amount of current instead of rapid charging / discharging, and therefore, the current is limited and can be manufactured at low cost. In particular, by setting the DC voltage used in the DC power cable 8 to the same level as the vehicle-mounted battery 3, it is possible to charge and discharge relatively large power even at a low current.

The electric vehicle 1 includes an in-vehicle battery 3, a one-way AC / DC converter 4, a normal charging AC power cable 5, a DC quick charging plug 6, a modem (communication device) 11, and a control device 12. The one-way AC / DC converter 4 includes two connection ports (an AC side port 4a and a DC side port 4b). The AC side port 4 a is connected to the normal charging AC power cable 5, and the DC side port 4 b is connected to the in-vehicle battery 3. The one-way AC / DC converter 4 is dedicated to charging, and converts an AC input into a DC output. The AC power cable 5 for normal charging is connected to a household AC 100 V or AC 200 V outlet 7 through a switching adapter cable of AC 100 V and AC 200 V when necessary.

Since the operating voltage of the in-vehicle battery 3 is generally less than about 400V DC, the DC power cable 8 can be made thin. When the electric vehicle 1 includes an in-vehicle DC / DC converter, the current flowing through the DC power cable 8 may be increased by setting the DC voltage to 30 V, for example. However, it is necessary to increase the diameter of the electric wire, and the DC power cable 8 is somewhat thicker. The DC voltage is classified as “low voltage” up to 750V.

The one-way AC / DC converter 4 is charge / discharge controlled by the control device 12. For example, the modem 11 receives a charging command from the power supplier and charges the in-vehicle battery 3 through the normal charging AC power cable 5. The in-vehicle battery 3 of the electric vehicle 1 is normally charged over about 8 hours using inexpensive late-night power.

Many AC / DC converters and DC / DC converters of various types are commercially available, and although not described in detail here, any AC / DC converter or DC / DC converter can be used in the present invention. Is possible.

  Converters vary greatly in circuit configuration and control method depending on whether they are unidirectional or bidirectional, and bidirectional are more expensive and expensive. On the other hand, the price varies greatly depending on the current, and the smaller the current handled, the cheaper the switching elements and diodes can be used. Alternatively, the cost is reduced by reducing the number of parallel rows of switching elements and diodes. As long as the voltage is 400 V or less, an inexpensive configuration can be obtained in any case. In the present invention, it is preferable to use an inexpensive AC / DC converter 9 installed in the house 2 while limiting the current and increasing the voltage accordingly to secure transmission energy. .

Pattern 1:
Next, in the charge / discharge system according to the first embodiment of the present invention, an operation when charge / discharge control is performed in accordance with a command from a power supplier will be described. When the frequency of the system locally increases or the voltage of the system increases due to the influence of private power generation such as solar power generation or wind power generation in the vicinity, the modem 11 and the house of the electric vehicle are passed through the power supplier's command center. The modem 13 receives an instruction to charge the in-vehicle battery 3.

  The control device 12 of the electric vehicle 1 starts charging via the normal charging AC power cable 5. On the other hand, the control device 14 of the house 2 charges and discharges the in-vehicle battery 3 through the DC power cable 8 and the quick charging plug 6 in a direction that reduces fluctuations in the home load 10. At that time, a voltage / current curve is formed from the DC current and the DC voltage, and the internal resistance of the in-vehicle battery 3 and the charge amount (SOC: State of Charge) of the in-vehicle battery are calculated and estimated from the slope.

  Based on the temperature information of the in-vehicle battery 3 obtained from the in-vehicle battery 3 through the modem 11 and the modem 13 after grasping the internal resistance of the in-vehicle battery 3 and the charge amount of the in-vehicle battery, the control device 14 of the house 2 Judge whether you can increase. When the temperature of the in-vehicle battery 3 is 0 ° C. or lower or exceeds 50 ° C., the charging current is not increased and the power supply provider side is notified through the modem 13 that charging is difficult.

  When the temperature of the in-vehicle battery 3 is near room temperature and it is determined from the amount of charge that charging is still possible, a command is issued to the control device 12 through the modem 13 and the modem 11 to increase the charging current. Further, the maximum charge / discharge current for load leveling through the bidirectional AC / DC converter 9 is increased. When the frequency and voltage of the system are stabilized, an instruction to stop charging the in-vehicle battery 3 is sent to the modem 11 of the electric vehicle 1 and the modem 13 of the house 2 through the command center of the power supplier.

  On the contrary, when the frequency of the grid is locally lowered or the voltage of the grid is lowered, the discharge to the vehicle-mounted battery 3 is sent to the modem 11 of the electric vehicle 1 and the modem 13 of the house 2 through the command center of the power supplier. Instructions come.

  The control device 12 of the electric vehicle 1 does not perform charging / discharging via the normal charging AC power cable 5. On the other hand, the control device 14 of the house 2 performs discharge in order to supply electric power from the in-vehicle battery 3 to the home load 10 via the DC power cable 8 and the quick charging plug 6. As for the discharge from the in-vehicle battery 3, if the over-discharge does not occur, the in-vehicle battery 3 is hardly deteriorated. Therefore, it is not necessary to estimate the internal resistance of the in-vehicle battery 3 and the charge amount of the in-vehicle battery 3.

  However, charging and discharging the in-vehicle battery 3 in a direction that reduces fluctuations in the home load 10 via the DC power cable 8 and the quick charging plug 6 instead of discharging, stabilizes the frequency and voltage of the system. In this case, a voltage / current curve is constructed from the DC current and the DC voltage, and from the slope, the internal resistance of the in-vehicle battery 3 and the charge amount (SOC: State of Charge) of the in-vehicle battery It is also possible to estimate by calculating.

  Even when the system frequency is locally lowered or the system voltage is lowered, if the system frequency or voltage is stabilized, the modem 11 of the electric vehicle 1 and the modem of the house 2 are passed through the command center of the power supplier. 13 is a discharge stop instruction to the in-vehicle battery 3 or a charge / discharge stop instruction for stabilizing the system.

Pattern 2:
Next, in the charge / discharge system according to Embodiment 1 of the present invention, an operation when charging the in-vehicle battery 3 using nighttime power will be described.

  When the night electricity time zone when the electricity rate is low is reached, the control device 12 of the electric vehicle 1 starts charging the in-vehicle battery 3 via the normal charging AC power cable 5 and the outlet 7 by a timer. On the other hand, the control device 14 of the house 2 performs charge / discharge for diagnosing the state of the in-vehicle battery 3 through the DC power cable 8 and the quick charging plug 6. The charging time is about 6 hours.

In the state diagnosis, a voltage / current curve is constructed from the DC current and DC voltage during charging and discharging, and the internal resistance of the in-vehicle battery 3 and the charge amount (SOC: State of Charge) of the in-vehicle battery are calculated from the slope. Guess. Further, the temperature of the in-vehicle battery 3 at the time of charging / discharging and the past diagnosis data of the in-vehicle battery 3 are collated to make a diagnosis about the presence / absence of the in-vehicle battery 3, life performance and remaining life. In other words, the in-vehicle battery 3 is diagnosed using the DC power cable 8 and the quick charging plug 6. The diagnosis of the in-vehicle battery 3 can be performed within a large range of change in the SOC by performing the diagnosis three times in the initial charging period, the middle charging period, and the last charging period.

Pattern 3:
Next, in the charge / discharge system according to the first embodiment of the present invention, the operation when it is necessary to quickly charge the electric vehicle 1 and run it will be described. When it is necessary to travel more than scheduled and return home, and then travel at night, it is necessary to use as much daytime power as possible instead of late-night power and to charge as much as possible as quickly as possible.

  For rapid charging in an emergency, the in-vehicle battery 3 is charged using both the normal charging AC power cable 5 and the DC power cable 8. In the meantime, the state of the in-vehicle battery 3 is diagnosed from changes in the charging current and voltage using the DC power cable 8, and overcharging or charging with damage to the in-vehicle battery 3 is avoided.

  Charging using the DC power cable 8 is desirably performed by gradually increasing or decreasing the charging current periodically like a sine wave. By periodically increasing / decreasing the charging current, it is possible to measure with a value in which the charging current and the voltage have changed, and it is possible to more accurately diagnose the in-vehicle battery 3. The inventors have found that when charging is performed by periodically increasing / decreasing the DC charging current rather than charging with a constant DC current, there is less damage to the lithium ion battery and the life can be extended. . Probably, the rate-determining process related to lithium ions can be relaxed with a periodic charging current, and it is presumed that there is a function of suppressing side reactions due to diffusion-controlled.

  By charging the in-vehicle battery 3 using both the normal charging AC power cable 5 and the DC power cable 8, it is naturally possible to charge more than in the case of the normal charging AC power cable 5 alone. , Can respond to rapid charging in an emergency.

Embodiment 2. FIG.
FIG. 2 is a schematic diagram showing a charge / discharge system between an electric vehicle and a house according to Embodiment 2 of the present invention. The difference from Embodiment 1 is that solar cell panel 20 is provided on the roof of house 2, and there is in-house power generation using sunlight. The solar cell panel 20 is connected to a unidirectional PV (Photovoltaic) inverter 21. In the daytime, the electric power generated by the solar cell panel 20 is used for the in-home load 10 via the AC breaker 15 or supplied to the system via the power meter 22 for power sale.

The PV inverter 21 includes two connection ports (an AC side port 21a and a DC side port 21b). The AC side port 21 a is connected to the system side and the house side, and the DC side port 21 b is connected to the solar cell panel 20. If the electric power generated by the PV inverter 21 is output from the grid side, it is supplied for sale, and when it is output to the house side, it is sent to private consumption. A similar effect can be obtained by using a wind power generator instead of the solar battery panel 20 as a private power generator.

Pattern 4:
It relates to the output leveling of in-house power generation and charging to the in-vehicle battery 3. In the second embodiment, the on-vehicle battery 3 of the electric vehicle 1 is charged with the electric power generated by the solar cell panel 20. The in-vehicle battery 3 is charged mainly through the normal charging AC power cable 5 and the one-way AC / DC converter 4 dedicated for charging. At the same time, the bidirectional AC / DC converter 9, the DC power cable 8, and the quick charging plug 6 are connected. Thus, charging / discharging for reducing fluctuations in the output of solar power generation and fluctuations in the home load 10 is performed. Since fluctuations in system frequency and voltage can be mitigated, it is possible to perform charging that is beneficial to the power supplier. The output leveling of the in-house power generation and the charging of the in-vehicle battery 3 may be performed by receiving a command from the power supply company by the modem 11 and the modem 13.

  At the same time, the in-vehicle battery 3 can be diagnosed based on the current and voltage of charging / discharging via the bidirectional AC / DC converter 9, the DC power cable 8, and the quick charging plug 6. Furthermore, on the basis of the temperature of the in-vehicle battery 3 and the diagnosis result, the current value charged in the in-vehicle battery 3 is controlled through the normal charging AC power cable 5 and the one-way AC / DC converter 4 dedicated to charging, thereby The battery 3 can be charged with little risk of life deterioration.

Pattern 5:
It relates to output leveling of private power generation. When the frequency of the grid increases or the voltage increases due to fluctuations in the output of sunlight, even if the in-vehicle battery 3 is fully charged in response to a command from the power supplier, both Charge / discharge control of solar cell output leveling is performed using the AC / DC converter 9, the DC power cable 8, and the quick charging plug 6. The control device 12 controls the in-vehicle battery 3 to discharge in accordance with the state of the in-house load 10 and gradually widens the current width that can be charged and discharged, thereby expanding the leveling capability. Lowering the SOC level of the in-vehicle battery 3 enables a so-called HEV (Hybrid Electric Vehicle) driving mode, and mitigates fluctuations in solar output and house load by repeated charging and discharging within a limited SOC range. Can be made.

  Further, in order to stabilize the system, the PV inverter 21 is instructed to reduce power generation in response to a command from the power supplier. The power generation can be easily reduced by reducing the current value from the maximum power peak control of the solar cell panel 20. Furthermore, by performing the hot water supply operation, the in-home load 10 can be increased and the discharge of the in-vehicle battery 3 can be accelerated, and the effect of expanding the contribution to system stabilization can be obtained.

Embodiment 3 FIG.
FIG. 3 is a schematic diagram showing a charge / discharge system between an electric vehicle and a house according to Embodiment 3 of the present invention. The difference from the second embodiment is that the home is provided with a bidirectional DC / DC converter 18 and a home power storage (power storage device) 19. The bidirectional DC / DC converter 18 is supplied with a DC voltage lower than that of the DC power cable 8 from the bidirectional AC / DC converter 9.

The bidirectional DC / DC converter 18 includes two connection ports (a high-pressure side port 18a and a low-pressure side port 18b). The high voltage side port 18 a is connected to the bidirectional AC / DC converter 9, and the low voltage side port 18 b is connected to the in-home power storage 19. The bidirectional DC / DC converter 18 can also convert a DC input input from the high voltage side port 18a into a DC output having a different voltage, or convert a DC input input from the low voltage side port 18b to a DC output having a different voltage. It can also be converted. The operation direction of the bidirectional DC / DC converter 18 is controlled by an instruction from the control device 14.

Pattern 6:
The present invention relates to output leveling of private power generation using the in-vehicle battery 3 and the in-house power storage 19 in combination. By using the home power storage 19 in combination, it is possible to greatly expand the function of stabilizing the frequency and voltage of the system. The home power storage 19 may be a battery, but using a capacitor makes it possible to more efficiently absorb instantaneous fluctuations. The capacitor here includes an electric double layer capacitor (EDLC), a lithium ion capacitor (LIC), a composite capacitor of a lithium battery and a capacitor, and the like.

Pattern 7:
This relates to charging of the in-vehicle battery 3 using the in-home power storage 19. If the in-home power storage 19 is a capacitor or a battery that can be rapidly discharged, the in-vehicle battery 3 can be rapidly charged. While leveling the output of the solar cell panel 20, a sudden output increase is stored in the home power storage 19, and the DC power cable 8 is connected to the DC power cable 8 via the bidirectional DC / DC converter 18 and the bidirectional AC / DC converter 9. It is also possible to gradually charge the in-vehicle battery 3 with a direct current through the rapid charging plug 6, and it is possible to achieve both avoidance of the influence of output fluctuations on the system and in-vehicle charging.

Pattern 8:
The present invention relates to AC power supply using the home power storage 19 and the in-vehicle battery 3 at the time of a power failure. Even when the commercial power supply fails, power is supplied to the home load 10 using the home storage 19 and the in-vehicle battery 3 as an emergency power source, lighting for ensuring safety in the house 2, and securing the power source of the refrigerator Operation with great merit for users is possible, such as prevention of thawing of frozen foods. When private power generation such as solar power generation or small wind power is possible, it is possible to supply power to the home while performing output leveling and leveling of the home load using the home power storage 19.

Pattern 9:
This relates to DC power supply using the in-house power storage 19 and the in-vehicle battery 3 at the time of a power failure. When DC power distribution is performed in the home, direct DC power can be directly supplied from the home power storage 19 and the in-vehicle battery 3 to the DC load in the home via the bidirectional DC / DC converter 18. Further, when the use of private power generation such as solar power generation or small wind power is possible, DC power is supplied to the home while performing output leveling with DC voltage and leveling of the home load 10 using the home power storage 19. It is possible.

  In the first to third embodiments, the method of receiving a command from the power supply company using the modem 11 and the modem 13 has been described. However, the present invention is not limited to this, and a PLC (Power Line Communications), a mobile phone, a personal computer is used. A similar effect may be obtained by using a navigation system for an electric vehicle, a command from a station that manages the electric vehicle, or the like. In addition, since a communication line is often attached to the quick charging plug 6 in addition to the two power lines, the communication line is attached to the DC power cable 8 and the communication line is used to connect the house 2 Communication between the control device 14 and the control device 12 of the electric vehicle 1 may be performed.

  The charge / discharge history is preferably stored in a storage medium. For example, it is possible to have the power supply company buy a high amount of electric power that contributed to the stabilization of the system, or to use it for predicting the life of the electric vehicle 1 or for the next diagnosis. The storage medium may be in the control device 14 of the house 2, may be in the control device 12 of the electric vehicle 1, and may be transmitted to and stored in a power supply company through a modem or the like. Or you may transmit and memorize | store by communication to the service center of an electric vehicle. It is desirable that the data be encrypted and communicated.

  Furthermore, it is desirable that an emergency stop button and a return button are provided in the house or in the electric vehicle in order to stop the functions described in the above embodiments in the event of a fire or an earthquake. In addition, it is desirable to install a screen that can monitor the energy transfer status of the normal charging AC power cable and DC power cable in the house or in the navigation of the electric vehicle.

4 one-way AC / DC converter, 5 normal charging AC power cable, 6 quick charging plug, 8 DC power cable, 9 bidirectional AC / DC converter, 18 bidirectional DC / DC converter, 19 residential power storage, 20 solar cell Panel, 21 PV inverter

Claims (3)

A bidirectional AC / DC converter installed in a house and having an AC side port connected to commercial power of the house and a DC side port connected to a quick charge plug of the electric vehicle;
A first communication device installed in the house to obtain a command from a power supplier;
A first control device for controlling an operation direction of the bidirectional AC / DC converter based on a command installed in the house and obtained by the first communication device;
An in-vehicle battery mounted in an electric vehicle;
A one-way AC / DC converter mounted on the electric vehicle, having a DC side port connected to the in-vehicle battery and an AC side port connected to an outlet of the house;
A second communication device mounted on the electric vehicle for obtaining a command from the power supplier;
A second control device for controlling a conversion state of the one-way AC / DC converter based on a command mounted on the electric vehicle and obtained by the second communication device;
A charging / discharging system between an electric vehicle and a house. It has an in-house power generator that generates DC power and an inverter that converts the DC power generated by the in-house power generator into AC power,
The charging / discharging system between an electric vehicle and a house according to claim 1, wherein the inverter supplies power to the system or the house based on an instruction from the first control device. A power storage device installed in a house, and a bidirectional DC / DC converter having one port connected to the DC port side of the bidirectional AC / DC converter and another port connected to the power storage device,
The charging / discharging system between an electric vehicle and a house according to claim 1, wherein the bidirectional DC / DC converter switches an operation direction based on an instruction from the first control device.

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