JP7809571B2 - Charge/discharge control system and charge/discharge control method - Google Patents

Description

The present invention relates to a charge/discharge control system and a charge/discharge control method.

In recent years, there has been a demand for the use of renewable energy, and some apartment buildings are equipped with distributed power sources such as solar panels and storage batteries. In such apartment buildings, in addition to AC power supplied from the grid, power is supplied to electrical loads using distributed power sources such as storage batteries installed in the solar power generation system.

Regarding technology for supplying power to electrical loads using distributed power sources, there is known a technology that enables reduction in installation costs by eliminating the need to adjust the voltage, frequency, and phase with the grid power source, and that allows at least a portion of the electrical load to operate even if power supply from the grid power source is stopped (see, for example, Patent Document 1).
According to this technology, a power supply system includes a DC power supply device and an electrical load. The DC power supply device receives power from an independent power supply that is separate from the power grid and outputs DC power. The electrical load is connected to a first power supply line that receives power from the power grid. The electrical load is also connected to a second power supply line that receives power from the DC power supply device. Therefore, the electrical load includes a power supply unit that can receive power from both the first power supply line and the second power supply line.
Meanwhile, there is technology that can supply electricity stored in electric vehicle (EV) batteries to homes via V2H (Vehicle to Home) charging and discharging equipment, which allows the electricity stored in the EV to be used as an emergency power source even in the event of a power outage.

JP 2014-131421 A

The amount of power generated by renewable energy sources is affected by natural conditions such as weather, so it is desirable to be able to introduce distributed energy resources such as EVs to consumers.
Let's consider charging an electric vehicle battery with electricity from the residential unit. In apartment complexes, the number of residential units and the number of parking spaces generally differ, and residents generally enter into a contract for using the parking spaces separately from the contract for living in their residential units. Because it is not specified in advance which residential unit residents will sign a contract for which parking spaces, it is necessary to install equipment to measure electricity usage in the parking spaces separately from the residential units, which increases costs.
Another option is to always match the users of the apartments and parking spaces, so that no electricity meters are installed in the parking spaces and charging is done using electricity from the apartments. However, if there are not enough parking spaces to match the number of apartments, there will be apartments with parking spaces where cars can be charged and apartments without parking spaces where charging can be done, and the latter will be less useful than the former.
In addition, especially in urban areas, many residents do not own cars, resulting in empty parking spaces, making it unreasonable to secure parking spaces for the number of apartments.
The above also applies when supplying electricity stored in an electric vehicle battery to an apartment.
An object of the present invention is to provide a charge/discharge control system and a charge/discharge control method that can supply power from a battery of an electric vehicle to a supply section that supplies power, or that can supply power to a battery of an electric vehicle from a power supply section that supplies power to the battery of an electric vehicle.

(1) In order to solve the above problem, one embodiment of the present invention is a charge/discharge control system that includes n (n is an integer greater than 0) V2H devices, a selection unit that selects unused V2H devices from the n V2H devices, and a connection unit that connects, via the V2H devices selected by the selection unit, one of k (k is an integer greater than n) parking lots where an electric vehicle requesting charging or discharging is parked, to one of m (m is an integer greater than n) sections included in a building, a supply section that supplies power from the battery of the electric vehicle or a power supply section that supplies power to the battery of the electric vehicle, and the V2H device selected by the selection unit supplies power from the battery of the electric vehicle to the supply section, or supplies power from the power supply section to the battery of the electric vehicle.

According to the charge/discharge control system of this embodiment, the charge/discharge control system includes n V2H devices, a selection unit, and a connection unit. V2H stands for "Vehicle to Home," and V2H devices are devices that enable the use of electricity stored in electric vehicles (EVs) at home. The selection unit selects an unused V2H device from the n V2H devices. The connection unit connects, via the V2H device selected by the selection unit, a parking lot from k parking lots where an EV requesting charging or discharging is parked, to a supply section that supplies power from the EV's battery or a power supply section that supplies power to the EV's battery from m sections included in the building. The V2H device selected by the selection unit supplies power from the EV's battery to the supply section, or supplies power from the power supply section to the EV's battery.

By configuring the charging and discharging control system in this manner, the connection unit can connect, via the V2H equipment selected by the selection unit, a parking lot among the k parking lots where an electric vehicle requesting charging or discharging is parked, to a supply section among the m sections included in the building that supplies power from the electric vehicle's battery or a power supply section that supplies power to the electric vehicle's battery. Therefore, the V2H equipment selected by the selection unit can supply power from the electric vehicle's battery to the supply section or supply power from the power supply section to the electric vehicle's battery.

(2) In one embodiment of the present invention, in the above-described charge/discharge control system, the connection unit may release the connection via the V2H device selected by the selection unit when the supply of power from the battery of the electric vehicle to the supply section has ended or the supply of power from the power supply section to the battery of the electric vehicle has ended.
By configuring the charging and discharging control system in this manner, the connection unit can switch the connection between one of the k parking lots where other electric vehicles requesting charging or discharging are parked and one of the m sections included in the building, which supplies power from the batteries of other electric vehicles or which supplies power to the batteries of other electric vehicles, via the V2H equipment selected by the selection unit.

(3) In one embodiment of the present invention, in the above-described charge/discharge control system, the connection unit connects a first parking lot where a first electric vehicle requesting charging is parked and a second parking lot where a second electric vehicle requesting discharging is parked via the V2H device selected by the selection unit, and the V2H device selected by the selection unit may supply power from the battery of the first electric vehicle to the battery of the second electric vehicle.
With this configuration, in the charge/discharge control system, the connection unit can connect a first parking lot where a first electric vehicle requesting charging is parked and a second parking lot where a second electric vehicle requesting discharging is parked via the V2H device selected by the selection unit. As a result, the V2H device selected by the selection unit can supply power from the battery of the first electric vehicle to the battery of the second electric vehicle. Electric power can be shared between the electric vehicles.

(4) In one embodiment of the present invention, in the above-described charge/discharge control system, the connection unit may terminate the connection via the V2H device selected by the selection unit when the V2H device selected by the selection unit has finished supplying power from the battery of the first electric vehicle to the battery of the second electric vehicle.
With this configuration, in the charge/discharge control system, the connection unit can release the connection via the V2H device selected by the selection unit when the V2H device selected by the selection unit finishes supplying power from the battery of the first electric vehicle to the battery of the second electric vehicle. Therefore, the connection unit can connect a first parking lot where another first electric vehicle requesting charging is parked with a second parking lot where another second electric vehicle requesting discharging is parked via the V2H device selected by the selection unit. Electric power can be shared between the other electric vehicles.

(5) In one embodiment of the present invention, in the above-described charge/discharge control system, the V2H device selected by the selection unit may supply power generated by a distributed power source from the power supply section to the battery of the electric vehicle.
With this configuration, the charge/discharge control system can charge electric vehicles with power generated by a distributed power source supplied to a distribution panel in the power supply section.

(6) One embodiment of the present invention is a charge/discharge control system as described above, further comprising a reception unit that receives reservation request information for requesting a reservation of a parking lot and a V2H device, and an allocation unit that allocates a parking lot and a V2H device to a reservation requester based on the reservation request information received by the reception unit, and the V2H device allocated by the allocation unit may control the charging and discharging of an electric vehicle parked in the allocated parking lot.
With this configuration, the charge/discharge control system can include a reception unit and an allocation unit. The reception unit receives reservation request information for requesting a reservation of a parking lot and a V2H device. The allocation unit allocates a parking lot and a V2H device to the reservation requester based on the reservation request information received by the reception unit. As a result, the V2H device allocated by the allocation unit can control the charging and discharging of electric vehicles parked in the allocated parking lot.

(7) In one embodiment of the present invention, in the charge/discharge control system described above, the reservation request information may include time information.
With this configuration, in the charge/discharge control system, the allocation unit can allocate a parking lot and a V2H device to a reservation requester based on time information included in the reservation request information received by the reception unit. As a result, the V2H device allocated by the allocation unit can control the charging and discharging of an electric vehicle parked in the allocated parking lot.

(8) One embodiment of the present invention is a charge/discharge control method including the steps of: a selection unit selecting an unused V2H device from among n (n is an integer greater than 0) V2H devices; a connection unit connecting, via the V2H device selected in the selecting step, a parking lot from among k (k is an integer greater than n) parking lots where an electric vehicle requesting charging or discharging is parked, to a supply section that supplies power from the battery of the electric vehicle or a power supply section that supplies power to the battery of the electric vehicle from among m (m is an integer greater than n) sections included in a building; and a step of the V2H device selected in the selecting step supplying power from the battery of the electric vehicle to the supply section or supplying power from the power supply section to the battery of the electric vehicle.
The charge/discharge control method according to one embodiment of the present invention is essentially the same invention as the charge/discharge control system, except that it is in a different category, and provides similar actions and effects.

The present invention provides a charge/discharge control system and charge/discharge control method that can supply power from an electric vehicle battery to a power supply section that supplies power, or that can supply power to an electric vehicle battery from a power supply section that supplies power to an electric vehicle battery.

1 is a diagram illustrating an example of the configuration of a charge/discharge control system according to an embodiment of the present invention. FIG. 2 is a diagram illustrating an example of the configuration of a connection device of the charge/discharge control system according to the present embodiment. FIG. 10 is a diagram showing an overview of another power supply system according to the present embodiment. FIG. 2 is a diagram illustrating an example of the operation of the charge/discharge control system according to the present embodiment. FIG. 10 is a diagram illustrating a configuration example of a charge/discharge control system according to a modified example of the embodiment. 10 is a flowchart showing an example of an operation of a charge/discharge control system according to a modified example of the embodiment.

Next, a connection device, a charge/discharge control system, and a charge/discharge control method according to the present embodiment will be described with reference to the drawings. The embodiment described below is merely an example, and the present invention is not limited to the following embodiment.
In all the drawings for explaining the embodiments, the same reference numerals are used for components having the same functions, and repeated explanations will be omitted.
Furthermore, in this application, "based on XX" means "based on at least XX," and includes cases where it is based on other elements in addition to XX. Furthermore, "based on XX" is not limited to cases where XX is used directly, but also includes cases where it is based on XX that has been calculated or processed. "XX" is any element (for example, any information).

(Embodiment)
(Charge/discharge control system)
Fig. 1 is a diagram showing an example of the configuration of a charge/discharge control system according to an embodiment of the present invention. In Fig. 1, the charge/discharge control system is installed in a building BU. An example of the building BU is an apartment building having multiple floors. As an example, the description will continue assuming that the building BU has two floors, a first floor and a second floor.
An apartment building is a building in which multiple households live and includes multiple compartments corresponding to the multiple households. Power is supplied to each of the multiple compartments by the power supply system 1, and the supplied power is used by consumers.

An example of building BU includes sections 50-1 to 50-3 and a common area 60-1 on the first floor, and sections 50-4 to 50-6 and a common area 60-2 on the second floor. Each of common areas 60-1 and 60-2 may include a common corridor (an interior corridor, an exterior corridor).
Any one of the common areas 60-1 and 60-2 is referred to as the common area 60. The common area 60 is equipped with, for example, lighting, a common entrance unit, an electric lock control device, an electrical outlet, a telephone security box, and the like.
Section 50-1 includes access point AP-1, a lower-level meter device 36-1, and a distribution board 34-1. In section 50-1, a consumer 30-1 uses power. The lower-level meter device 36-1 is a meter that measures the power consumption of section 50-1. The distribution board 34-1 supplies AC power supplied by the power conditioner 200 to the consumer 30-1.
Section 50-2 includes access point AP-2, a lower-level metering device 36-2, and a distribution board 34-2. In section 50-2, a consumer 30-2 uses power. The lower-level metering device 36-2 is a meter that measures the power consumption of section 50-2. The distribution board 34-2 supplies AC power supplied by the power conditioner 200 to the consumer 30-2.
Section 50-3 includes access point AP-3, a lower-level meter device 36-3, and a distribution board 34-3. A consumer 30-3 uses power in section 50-3. The lower-level meter device 36-3 is a meter that measures the power consumption of section 50-3. The distribution board 34-3 supplies AC power supplied by power conditioner 200 to the consumer 30-3.

Section 50-4 includes an access point AP-4, a lower-level metering device 36-4, and a distribution board 34-4. A consumer 30-4 uses power in section 50-4. The lower-level metering device 36-4 is a meter that measures the power consumption of section 50-4. The distribution board 34-4 supplies AC power supplied by the power conditioner 200 to the consumer 30-4.
Section 50-5 includes an access point AP-5, a lower-level meter device 36-5, and a distribution board 34-5. A consumer 30-5 uses power in section 50-5. The lower-level meter device 36-5 is a meter that measures the power consumption of section 50-5. The distribution board 34-5 supplies AC power supplied by the power conditioner 200 to the consumer 30-5.
Section 50-6 includes an access point AP-6, a lower-level meter device 36-6, and a distribution board 34-6. A consumer 30-6 uses power in section 50-6. The lower-level meter device 36-6 is a meter that measures the power consumption of section 50-6. The distribution board 34-6 supplies AC power supplied by the power conditioner 200 to the consumer 30-6.
Any one of the sections 50-1 to 50-6 will be referred to as section 50. Any one of the distribution boards 34-1 to 34-6 will be referred to as distribution board 34.

The building BU also has parking lots PA attached thereto, which include parking lots PA-1, PA-2, and PA-3.
The parking lot PA-1 is equipped with a charging/discharging device CDD-1 that charges and discharges the batteries of electric vehicles parked in the parking lot PA-1.
The parking lot PA-2 is equipped with a charging/discharging device CDD-2 that charges and discharges the batteries of electric vehicles parked in the parking lot PA-2.
The parking lot PA-3 is equipped with a charging/discharging device CDD-3 that charges and discharges the batteries of electric vehicles parked in the parking lot PA-3.
In the example shown in FIG. 1, an electric vehicle EV-1 is parked in parking lot PA-1, an electric vehicle EV-2 is parked in parking lot PA-2, and an electric vehicle EV-3 is parked in parking lot PA-3.
Any one of charging/discharging devices CDD-1, CDD-2, and CDD-3 will be referred to as charging/discharging device CDD. Any one of electric vehicles EV-1, EV-2, and EV-3 will be referred to as electric vehicle EV.

The charge/discharge control system includes a power conditioner 200 and a connection device 400 .
The power conditioner 200 is connected to a host meter device 33, the solar cell module SC, and the connection device 400. The host meter device 33 is a meter for measuring the amount of power contracted with the electric power company 4. An example of the host meter device 33 is a collective power receiving meter. The host meter device 33 measures the amount of power consumed by the consumers 30-1 to 30-6, the amount of power consumed by the common section 60, and the amount of power supplied to the electric vehicle EV.
A smart meter is an example of the host meter device 33. An example of the power conditioner 200 is installed in the common area 60. The power conditioner 200 converts DC power into AC power.
Each of the consumers 30-1 to 30-6 has concluded a power supply contract with the intermediary company. Each of the consumers 30-1 to 30-6 pays an electricity charge (fee) to the intermediary company. The intermediary company has concluded a lump-sum contract for low-voltage power with an electric power company 4 such as an electric power utility. The conclusion of the lump-sum contract for low-voltage power between the intermediary company and the electric power company 4 will be described later.

The power conditioner 200 converts either or both of the low-voltage power received in bulk from the power company 4 and the power from the grid power source, and the DC power generated by the solar cell module SC, into AC power, and supplies the converted AC power to each of the consumers 30-1 to 30-6 and the common section 60-1 to the common section 60-2.
Furthermore, the power conditioner 200 converts either or both of the low-voltage power received collectively from the power company 4 and the power from the grid power supply, and the DC power generated by the solar cell module SC, into AC power, and converts the voltage of the power converted into AC power into a voltage that can be charged into the battery of the electric vehicle EV. The power converted into a voltage that can be charged into the battery of the electric vehicle EV is supplied to the battery of the electric vehicle EV by cable C-7 via the connection device 400. Any of the cables C-1 to C-7 will be referred to as cable C.

For example, during the day, the power conditioner 200 converts the DC power generated by the solar cell module SC into AC power and supplies the converted AC power to each of the consumers 30-1 to 30-6 and the common section 60-1 to the common section 60-2.
For example, at night, the power conditioner 200 supplies power stored in the battery of the electric vehicle EV to each of the consumers 30-1 to 30-6 and to the common section 60-1 and the common section 60-2. By configuring in this way, the DC power generated by the solar cell module SC can be used in the building BU as much as possible, thereby reducing the amount of power purchased from the electric power company 4.

Each of charging/discharging devices CDD-1 to CDD-3 discharges the electric power stored in the battery of each of electric vehicles EV-1 to EV-3 connected thereto. Each of charging/discharging devices CDD-1 to CDD-3 supplies the electric power obtained by discharging the battery of each of electric vehicles EV-1 to EV-3 to one of consumers 30-1 to 30-6 connected thereto via connection device 400.
For example, the connection device 400 and distribution board 34-1 are connected via cable C-1, the connection device 400 and distribution board 34-2 are connected via cable C-2, the connection device 400 and distribution board 34-3 are connected via cable C-3, the connection device 400 and distribution board 34-4 are connected via cable C-4, the connection device 400 and distribution board 34-5 are connected via cable C-5, and the connection device 400 and distribution board 34-6 are connected via cable C-6.

Since the power obtained by discharging the batteries of electric vehicles EV-1 to EV-3 can be supplied to any of consumers 30-1 to 30-6, there is no need for storage battery 100 that temporarily stores the power obtained by discharging the batteries of electric vehicles EV-1 to EV-3.
The electric power obtained by discharging the batteries of the electric vehicles EV-1 to EV-3 is supplied to the electric loads included in the consumers 30-1 to 30-6 included in the building BU.

An example of an electrical load is a communication device (not shown). The communication device is connected to each of the access points AP-1 to AP-6 by a LAN (Local Area Network) cable. An example of a LAN cable is one that supports PoE (Power over Ethernet) power supply.
For example, the communication device and the access point AP-1 are connected by a LAN cable laid in the section 50-1, and the communication device and the access point AP-2 are connected by a LAN cable laid in the section 50-2.
For example, the communication device and the access point AP-3 are connected by a LAN cable laid in the section 50-3, and the communication device and the access point AP-4 are connected by a LAN cable laid in the section 50-4.
For example, the communication device and the access point AP-5 are connected by a LAN cable laid in the section 50-5, and the communication device and the access point AP-6 are connected by a LAN cable laid in the section 50-6.
If power is not supplied from either the power company 4 or the grid power supply due to a power outage or the like, the power conditioner 200 can supply the power stored in the storage battery 100 to each of the access points AP-1 to AP-6. This allows communication to continue via the access points AP-1 to AP-6.

Each of the access points AP-1 to AP-6 operates on power supplied by communication devices. Residents of each of the sections 50-1 to 50-6 (consumers 30-1 to 30-6) can communicate with the outside world via each of the access points AP-1 to AP-6.
For example, the residents (consumers 30-1 to 30-6) may communicate via access points AP-1 to AP-6 using a wireless communication method such as wireless LAN or LTE (registered trademark). By configuring in this manner, the communication function of the building BU can be maintained in the event of a power outage.

Connection device 400 includes first meter 310-1, second meter 310-2, first V2H device 320-1, second V2H device 320-2, selection unit 330, connection unit 340, and operation unit 350.
First meter 310-1 measures the amount of power supplied from first V2H device 320-1 to any one of consumers 30-1 to 30-6. Second meter 310-2 measures the amount of power supplied from second V2H device 320-2 to any one of consumers 30-1 to 30-6. Either first meter 310-1 or second meter 310-2 will be referred to as meter 310.
The first V2H device 320-1 converts into AC power that can be used in the home any of the following: DC power from the battery of electric vehicle EV-1 supplied by charging/discharging device CDD-1 via cable CE-1; DC power from the battery of electric vehicle EV-2 supplied by charging/discharging device CDD-2 via cable CE-2; and DC power from the battery of electric vehicle EV-3 supplied by charging/discharging device CDD-3 via cable CE-3.
The second V2H device 320-2 converts into AC power that can be used in the home any of the DC power from the battery of electric vehicle EV-1 supplied by charging/discharging device CDD-1 via cable CE-1, the DC power from the battery of electric vehicle EV-2 supplied by charging/discharging device CDD-2 via cable CE-2, and the DC power from the battery of electric vehicle EV-3 supplied by charging/discharging device CDD-3 via cable CE-3.
Any one of the first V2H device 320-1 and the second V2H device 320-2 will be referred to as a V2H device 320. Any one of the cables CE-1 to CE-3 will be referred to as a cable CE.

FIG. 2 is a diagram showing an example of the configuration of a connection device of the charge/discharge control system according to this embodiment.
Connection device 400 includes, for example, a first switch FSW and a second switch SSW. First switch FSW switchably connects cables CE-1 to CE-3 with first V2H device 320-1, second V2H device 320-2, and second switch SSW. Second switch FSW switchably connects first V2H device 320-1, second V2H device 320-2, and first switch FSW with cables C-1 to C-7.
Operation information is input through the operation unit 350. As an example, the operation unit 350 may have keys, etc. In this case, the operation unit 350 inputs operation information corresponding to an operation performed on the operation unit 350 by a user.
Operation information including user identification information, information identifying the parking lot among parking lots PA-1 to PA-3 in which the electric vehicle EV to be charged or discharged is parked, and information identifying the supply section among sections 50-1 to 50-6 included in building BU to which power is supplied from the battery of the electric vehicle EV or information identifying the power supply section to which power is supplied to the battery of the electric vehicle EV is supplied, is input to operation unit 350.

The selection unit 330 acquires operation information from the operation unit 350. If the operation information includes information specifying the supply category, the selection unit 330 selects the first V2H device 320-1 or the second V2H device 320-2 that is not in use. For example, the selection unit 330 selects the first V2H device 320-1 or the second V2H device 320-2 that is not connected to the first switch FSW. If both the first V2H device 320-1 and the second V2H device 320-2 are in use, the selection unit 330 may display on a display unit (not shown) that they are unavailable.

The connection unit 340 acquires operation information from the operation unit 350. When the operation information includes information for specifying a parking lot and information for specifying a power supply section, the connection unit 340 switches the first switch FSW and the second switch SSW so as to connect the cable CE from the charging/discharging device CDD installed in the parking lot corresponding to the information for specifying the parking lot to the cable C from the power supply section.
When the operation information includes information specifying a parking lot and information specifying a supply category, the connection unit 340 switches the first switch FSW and the second switch SSW so as to connect a cable CE from the charging/discharging device CDD installed in a parking lot corresponding to the information specifying the parking lot to a cable C from the supply category via either the first V2H device 320-1 or the second V2H device 320-2 selected by the selection unit 330.

The following describes a case where, as shown in Figure 2, cable CE-1 from charging/discharging device CDD-1 installed in parking lot PA-1 where electric vehicle EV-1 is parked is connected to cable C-1 from distribution board 34-1 in section 50-1 via first V2H device 320-1 and first meter 310-1, cable CE-2 from charging/discharging device CDD-2 installed in parking lot PA-2 where electric vehicle EV-2 is parked is connected to cable C-3 from distribution board 34-3 in section 50-3, and cable CE-3 from charging/discharging device CDD-3 installed in parking lot PA-3 where electric vehicle EV-3 is parked is connected to cable C-5 from distribution board 34-5 in section 50-5.

Charging/discharging device CDD-1 supplies DC power stored in the battery of electric vehicle EV-1 parked in parking lot PA-1 to first V2H device 320-1 via cable CE-1. First V2H device 320-1 converts the DC power from charging/discharging device CDD-1 into AC power that can be used at home. First V2H device 320-1 supplies the AC power via first meter 310-1 and cable C-1 to distribution board 34-1 in section 50-1.
AC power is supplied to charging/discharging device CDD-2 from distribution board 34-3 in section 50-3 via cables C-3 and CE-2. Charging/discharging device CDD-2 converts the AC power from distribution board 34-3 into DC power, and uses the DC power to charge the battery of electric vehicle EV-2 parked in parking lot PA-2.
AC power is supplied to charging/discharging device CDD-3 from distribution board 34-5 in section 50-5 via cables C-5 and CE-3. Charging/discharging device CDD-3 converts the AC power from distribution board 34-5 into DC power, and uses the DC power to charge the battery of electric vehicle EV-3 parked in parking lot PA-3.

The conclusion of a lump-sum contract for low-voltage electricity between the distributor and the electric power company 4 will now be described.
The power supply system 1 includes, for example, a first residence, a second residence, a power company, an intermediary company, a third residence, and a power supply destination.
The first residence is an apartment building or a single-family home. The first residence is equipped with a photovoltaic power generation system PV. The second residence is an apartment building or a single-family home. The second residence is equipped with a photovoltaic power generation system PV and a storage battery.
The electric power company purchases surplus electricity from the first residence and the second residence through the intermediary company. Note that the electric power company may purchase electricity from the first residence, which does not have a storage battery, at a standard price, and purchase electricity from the second residence, which has a storage battery, at a premium price higher than the standard price. The electric power company supplies the electricity purchased through the intermediary company to, for example, a third residence constructed by the intermediary company and to the intermediary company's power supply destination.

The builders of the first and second houses may rent their roofs, etc. to the agency. In this case, the agency installs a solar power generation system PV on the roof rented from the builder of the first house and manages and maintains the solar power generation system PV.
The agency will install a solar power generation system (PV) on the roof rented from the owner of the second house, install a storage battery, and maintain and manage the solar power generation system (PV) and the storage battery. The agency will also act as an intermediary for the power company's electricity.
The third residence is, for example, a residence constructed by an agency. The residence may be an apartment building or a single-family home.
The power supply destinations are operated by distributors or power companies. Examples of power supply destinations include offices, exhibition centers, and factories.

Fig. 3 is a diagram showing an outline of another power supply system according to the present embodiment. The power supply system 1A shown in Fig. 3 includes, for example, a house 20 under contract with an agency, an electric vehicle 23, a consumer 24, an owner (builder) 25 of the house 20, a wholesale electricity market 26, a second utility company 27, a house 28, and an office 29 of the first utility company.
The house 20 is, for example, a rental apartment building, and is equipped with a distributed power source 21 having, for example, a photovoltaic power generation system PV and a storage battery.
The electricity generated or stored in the distributed power source 21 is supplied at low cost to the facilities of multiple consumers 24 residing in the house 20 via the first business operator.
In the event of a power outage, the distributed power source 21 supplies power stored in a storage battery to, for example, a common area. The distributed power source 21 may also be linked to, for example, an electric vehicle 23 of a consumer 24, and supply power to the electric vehicle.

The first business operator 22 is an intermediary company. The first business operator 22 supplies surplus electricity from the residence 20 to the second business operator. The first business operator 22 also purchases electricity at a low price from the second business operator 27. The relationship between the first business operator 22 and the second business operator 27 is as shown in the dashed-line rectangle g10.
Furthermore, if the owner 25 rents the roof or the like of the house 20 to the first business operator, the first business operator 22 may pay the owner 25 rent for the roof, for example, based on the number of solar cell modules or the amount of electricity generated or consumed.
The home 28 is another home whose roof is rented to the first business operator 22. A solar cell module has been installed on the roof of the home 28 by the first business operator.
The second business operator 27 has a power grid. The second business operator 27 purchases surplus power generated by the distributed power sources 21 via the first business operator 22, and purchases power from the wholesale power market 26. The second business operator 27 purchases surplus power from homes 28. The second business operator 27 supplies this power to the first business operator's business establishments 29 and the like.
The system shown in Fig. 3 is an example, and the present invention is not limited to this. Returning to Fig. 1, the description will be continued.

The building BU is connected to, for example, a grid from an electric power company 4. An example of the grid is a low-voltage collective power supply.
In the building BU, a power supply node (not shown) that supplies power from a distributed power source such as a solar cell module SC is provided between a power receiving panel (not shown) and a distribution panel (not shown). The power supply node includes, for example, a sensor and a terminal block.
The building BU may also include an output control device that includes, for example, a remote control for controlling the output of the solar cell modules SC, a device for accepting remote operation from outside, etc. The building BU may also include, for example, a solar power expansion panel so that it can accommodate the expansion of the solar cell modules SC.

The upper meter device 33 has an input side connected to the system from the electric power company 4 and an output side connected to the input side of the power receiving panel.
The output side of the power receiving panel is connected to the input side of the distribution panel and to the first output side of the power conditioner 200 via the power feeding node.
The power conditioner 200 is connected to the solar cell module SC.
The power conditioner 200 has a first output side connected to the input sides of the lower level meter devices 36-1 to 36-6.

The output sides of the lower meter devices 36-1 to 36-6 are connected to the input sides of the distribution boards 34-1 to 34-6 included in the divisions 50-1 to 50-6, respectively. The output sides of the distribution boards 34-1 to 34-6 are connected to the consumer premises 30-1 to 30-6, respectively.
The host meter device 33 is a meter for measuring the amount of electricity contracted with the electric power company 4. An example of the host meter device 33 is a collective power receiving meter. The host meter device 33 measures the amount of electricity consumed by the consumers 30-1 to 30-6 and the amount of electricity consumed by the common section 60. An example of the host meter device 33 is a smart meter.
The power receiving panel is connected to the host meter device 33 and receives power from the grid through low-voltage bulk power reception. The power receiving panel includes, for example, a current transformer and a breaker for the grid. The power receiving panel supplies the received power to the distribution panel.

The distributed power source includes at least a solar cell module SC. The distributed power source may also include a fuel cell, a wind power generation system, or the like.
The power conditioner 200 controls the solar cell module SC. The power conditioner 200 converts the DC power generated by the solar cell module SC into AC power that can be used in the home.

The distribution board includes, for example, a plurality of breakers and sensors for each branch destination. The distribution board branches the power received by the power receiving board during grid-connected operation into a plurality of branches and distributes the power to the common section 60 and each of the customers 30-1 to 30-6.
The distribution board also branches the power supplied via the power conditioner 200 into a plurality of branches and distributes the power to the common section 60 and the customers 30-1 to 30-6, respectively.
If the building BU has multiple floors, the distribution board may distribute the power supplied via the power conditioner 200 among the floors.

The common area 60 is, for example, an electrical facility such as a lobby, a corridor, a management office, or a meeting place of the building BU. The common area 60 is equipped with, for example, a router, an outlet, and other electrical outlets. Note that power is supplied to the outlets under normal circumstances but is not supplied during a power outage. Power is not supplied to the router and the outlets under normal circumstances but is supplied during a power outage.
The lower level meter devices 36-1 to 36-6 are meters that measure the power consumption of the customers 30-1 to 30-6, respectively.
The distribution boards 34-1 to 34-6 distribute power to the consumers 30-1 to 30-6, respectively. Each of the distribution boards 34-1 to 34-6 includes one or more breakers (not shown) and sensors (not shown).
Consumers 30-1 to 30-6 are included in sections 50-1 to 50-6 of building BU, respectively. For example, sections 50-1 to 50-6 include access points AP-1 to AP-6 and loads LO-1 to LO-6, respectively. Examples of loads LO-1 to LO-6 are outlets, lights, etc.
The distributor acquires the results of measurements made by each of the lower-level meter devices 36-1 to 36-6, calculates the power consumption based on the acquired results, and collects the electricity bill from each of the consumers 30-1 to 30-6. The results of measurements made by each of the lower-level meter devices 36-1 to 36-6 may be acquired by the power conditioner 200, for example, and output to the electric power company 4.

(Normal operation and power outage operation)
Next, examples of operation during normal operation and during a power outage will be described.
Under normal circumstances, the power generated by the solar cell module SC is supplied to the distribution board via the power conditioner 200 .
The distribution board supplies the supplied power to the outlets in the common area 60 and to each of the customers 30-1 to 30-6.
When the generated power alone is insufficient to meet the demand, the power receiving panel supplies grid power to the outlets in the common area 60 and to each of the customers 30-1 in section 50-1 to 30-6 in section 50-6.
When the power generated by the solar cell module SC is surplus, the power conditioner 200 sells the generated power to the grid via the power receiving panel.
Note that the outlet that normally supplies power to the common area 60 is an example and is not limited to this. For example, power may also be supplied to the lights installed in the common area 60, the control device for the electronic key at the entrance, and the like.

During a power outage, the power conditioner 200 detects whether or not power is being supplied from the grid, and if power is being generated by the solar cell module SC, it supplies the power generated by the solar cell module SC to the router and outlet in the common area 60 via a switching panel.
If power is generated by the solar cell module SC during a power outage, the power conditioner 200 may supply the power generated by the solar cell module SC to the distribution board. In this case, power may also be supplied from the distribution board to each of the consumers 30-1 to 30-6.
Note that the router and outlet that supply power to the common area 60 during a power outage are just an example, and are not limited to this. For example, power may also be supplied to an emergency light installed in the common area 60, a control device for an electronic key at the entrance, and the like.
The power conditioner 200 and the connection device 400 are realized by, for example, a hardware processor such as a CPU (Central Processing Unit) executing a computer program (software) stored in a storage unit (not shown).
Furthermore, some or all of these functional units may be realized by hardware (including circuitry) such as an LSI (Large Scale Integration), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a GPU (Graphics Processing Unit), or may be realized by a combination of software and hardware.

(Operation of the charge/discharge control system)
FIG. 4 is a diagram showing an example of the operation of the charge/discharge control system according to this embodiment.
The operation of the charge/discharge control system will be described below in terms of the operation when power is supplied from the battery of the electric vehicle EV to the supply section or when power is supplied from the power supply section to the battery of the electric vehicle EV.
(Step S1-1)
In the charge/discharge control system, the operation unit 350 of the connection device 400 acquires operation information. The operation information includes user identification information, information specifying the parking lot among parking lots PA-1 to PA-3 in which the electric vehicle EV to be charged or discharged is parked, and information specifying the supply section among sections 50-1 to 50-6 included in the building BU to which power is supplied from the battery of the electric vehicle EV or information specifying the power supply section to which power is supplied to the battery of the electric vehicle EV.
(Step S2-1)
In the charge/discharge control system, the selection unit 330 of the connection device 400 determines whether or not the operation information includes information specifying the supply category.
(Step S3-1)
In the charge/discharge control system, when the selection unit 330 of the connection device 400 determines that the operation information includes information specifying the supply category, it selects one of the first V2H device 320-1 and the second V2H device 320-2 that is not in use.

(Step S4-1)
In the charge/discharge control system, when operation information includes information specifying a parking lot and information specifying a supply category, connection unit 340 of connection device 400 switches between first switch FSW and second switch SSW to connect cable CE from charging/discharging device CDD installed in a parking lot corresponding to the information specifying the parking lot to cable C from the supply category via either first V2H device 320-1 or second V2H device 320-2 selected by selection unit 330.
(Step S5-1)
In the charge/discharge control system, the charge/discharge device CCD supplies power from the battery of the electric vehicle EV to the supply section via the V2H device 320 selected by the selection unit 330 .
(Step S6-1)
In the charge/discharge control system, the charge/discharge device CCD determines whether the supply of power from the battery of the electric vehicle EV to the supply section has ended.
(Step S7-1)
In the charge/discharge control system, when the charge/discharge device CCD determines that the supply of power from the battery of the electric vehicle EV to the supply section has ended, it outputs information to the connection device 400 to notify that the supply of power has ended. In the connection device 400, the connection unit 340 releases the connection based on the information to notify that the supply of power from the charge/discharge device CDD has ended. Then, the process returns to step S1-1.

(Step S8-1)
In the charge/discharge control system, when the selection unit 330 determines that the operation information does not include information specifying the supply section, the connection unit 340 of the connection device 400 switches between the first switch FSW and the second switch SSW to connect the cable CE from the charge/discharge device CDD installed in the parking lot corresponding to the information specifying the parking lot to the cable C from the power supply section.
(Step S9-1)
In the charge/discharge control system, the charge/discharge device CCD supplies power from the power supply section to the battery of the electric vehicle EV.
(Step S10-1)
In the charge/discharge control system, the charge/discharge device CCD determines whether the supply of power from the power supply section to the battery of the electric vehicle EV has ended.
(Step S11-1)
In the charge/discharge control system, when the charge/discharge device CCD determines that the supply of power from the power supply section to the battery of the electric vehicle EV has ended, it outputs information to the connection device 400 to notify that the supply of power has ended. In the connection device 400, the connection unit 340 releases the connection based on the information to notify that the supply of power from the charge/discharge device CDD has ended. Then, the process returns to step S1-1.

In the above embodiment, the building BU has two floors, the first floor and the second floor, but the present invention is not limited to this example.
For example, the building BU may have three or more floors.
In the above embodiment, the building BU has two floors, the first floor and the second floor, each of which has three sections, but the present invention is not limited to this example.
For example, each floor of the building BU may have one or two sections, or may have four or more sections. Also, the number of sections provided on each floor of the building BU may differ.
In the above-described embodiment, the case where the building BU is supplied with power from the power company 4 and the system power supply has been described, but the present invention is not limited to this example.
For example, the building BU may be supplied with power from the electric power company 4 or from a grid power supply. When the building BU is supplied with power from the electric power company 4, the power conditioner 200 determines whether or not it is being supplied with power from the electric power company 4. When the building BU is supplied with power from the grid power supply, the power conditioner 200 determines whether or not it is being supplied with power from the grid power supply.

In the above embodiment, the case where parking lots PA-1 to PA-3 are provided adjacent to the building BU has been described, but the present invention is not limited to this example.
For example, the number of parking lots attached to the building BU may be one or two, or may be four or more. A charging/discharging device CDD is installed in each of the plurality of parking lots.
In the above-described embodiment, the case where the connection device 400 includes two combinations of the meter 310 and the V2H device 320 has been described, but the present invention is not limited to this example.
For example, the connection device 400 may include one combination of the meter 310 and the V2H device 320, or may include three or more combinations.

In the above-described embodiment, a power supply node that supplies power from a distributed power source may be provided between the upper meter device and the power receiving panel. Also, a power supply node that supplies power from a distributed power source may be provided between the distribution panel and each of the lower meter devices 36-1 to 36-6.
Furthermore, a power supply node that supplies power from the distributed power source may be provided between the distribution board and each of the lower level meter devices 36-1 to 36-6.

In the above-described embodiment, the operation information may include user identification information, information identifying the parking lot among parking lots PA-1 to PA-3 in which the electric vehicle EV requesting charging is parked, and information identifying the parking lot among parking lots PA-1 to PA-3 in which the electric vehicle EV requesting discharging is parked.
In this case, the connection unit 340 switches the first switch FSW to connect the CE from the charging/discharging device CDD installed in the first parking lot where the first electric vehicle EV requesting charging is parked, to the CE from the charging/discharging device CDD installed in the second parking lot where the second electric vehicle EV requesting discharging is parked.
With this configuration, the battery of the first electric vehicle EV that is requested to be charged can be supplied with the electric power stored in the battery of the second electric vehicle EV that is requested to be discharged.

The charge/discharge control system according to this embodiment includes n (n is an integer greater than 0) V2H devices 320, a selection unit 330 that selects an unused V2H device from among the n V2H devices 320, and a connection unit 340 that connects, via the V2H device 320 selected by the selection unit 330, one of k (k is an integer greater than n) parking lots in which an electric vehicle EV requesting charging or discharging is parked, and one of m (m is an integer greater than n) sections included in the building BU to a supply section that supplies power from the battery of the electric vehicle EV or a power supply section that supplies power to the battery of the electric vehicle EV. The V2H device 320 selected by the selection unit 330 supplies power from the battery of the electric vehicle EV to the supply section, or supplies power from the power supply section to the battery of the electric vehicle EV.

By configuring the charging and discharging control system in this manner, the connection unit 340 can connect, via the V2H equipment 320 selected by the selection unit 330, a parking lot among the k parking lots where the electric vehicle EV requesting charging or discharging is parked, to a supply section among the m sections included in the building BU that supplies power from the battery of the electric vehicle EV or a power supply section that supplies power to the battery of the electric vehicle EV. Therefore, the V2H equipment 320 selected by the selection unit 330 can supply power from the battery of the electric vehicle EV to the supply section or supply power from the power supply section to the battery of the electric vehicle EV.

In the above-described charge/discharge control system, the connection unit 340 may be configured to terminate the connection via the V2H device 320 selected by the selection unit 330 when the V2H device 320 selected by the selection unit 330 has finished supplying power from the battery of the electric vehicle EV to the supply section, or when the power supply from the power supply section to the battery of the electric vehicle EV has finished.
By configuring the charging and discharging control system in this manner, the connection unit 340 can switch the connection between a parking lot among the k parking lots where other electric vehicles EV requesting charging or discharging are parked and a supply section among the m sections included in the building BU that supplies power from the batteries of other electric vehicles EV or a power supply section that supplies power to the batteries of other electric vehicles EV, via the V2H equipment 320 selected by the selection unit 330.

In the above-described charge/discharge control system, the connection unit 340 connects a first parking lot where a first electric vehicle requesting charging is parked and a second parking lot where a second electric vehicle requesting discharging is parked via a V2H device selected by the selection unit 330, and the V2H device selected by the selection unit 330 may supply power from the battery of the first electric vehicle to the battery of the second electric vehicle.
With this configuration, in the charge/discharge control system, the connection unit 340 can connect a first parking lot where a first electric vehicle requesting charging is parked and a second parking lot where a second electric vehicle requesting discharging is parked, via the V2H device selected by the selection unit 330. As a result, the V2H device selected by the selection unit 330 can supply power from the battery of the first electric vehicle to the battery of the second electric vehicle. Electric power can be shared between the electric vehicles.

In the above-described charge/discharge control system, the connection unit 340 may be configured to terminate the connection via the V2H device selected by the selection unit 330 when the V2H device 320 selected by the selection unit 330 has finished supplying power from the battery of the first electric vehicle to the battery of the second electric vehicle.
With this configuration, in the charge/discharge control system, connection unit 340 can release the connection via V2H device 320 selected by selection unit 330 when V2H device 320 selected by selection unit 330 finishes supplying power from the battery of the first electric vehicle to the battery of the second electric vehicle. Therefore, connection unit 340 can connect a first parking lot where another first electric vehicle requesting charging is parked, to a second parking lot where another second electric vehicle requesting discharging is parked, via the V2H device selected by selection unit 330. Electric power can be shared between the other electric vehicles.

In the above-described charge/discharge control system, the V2H device 320 selected by the selection unit 330 may supply power generated by a distributed power source from the power supply section to the battery of the electric vehicle EV.
With this configuration, the charge/discharge control system can charge electric vehicles with power generated by a distributed power source supplied to a distribution panel in the power supply section.

(Modification of the embodiment)
5 is a diagram showing an example of the configuration of a charge/discharge control system according to a modification of the embodiment. The charge/discharge control system according to the modification includes a communication unit 301a, a reception unit 302a, and an allocation unit 304a, and differs from the charge/discharge control system according to the embodiment in that it includes a connection unit 340a instead of the connection unit 340 in the charge/discharge control system according to the embodiment.
A resident (requester) who wants to discharge the electricity stored in the battery of an electric vehicle EV parked in a parking lot PA and have the discharged electricity supplied to the supply section uses a terminal device (not shown) to create reservation request information to request a reservation for the V2H device 320 and the meter 310 from the charge/discharge control system.
The reservation request information includes user identification information, information specifying the parking lot where the discharging electric vehicle EV is parked among parking lots PA-1 to PA-3, information specifying the supply section to which power is supplied from the battery of the electric vehicle EV among sections 50-1 to 50-6 included in building BU, date information, and time information. The terminal device transmits the created reservation request information to the charge/discharge control system.

In the charge/discharge control system, the communication unit 301a is implemented by a communication module. The communication unit 301a communicates with an external communication device via a network NW (not shown). The communication unit 301a may communicate using a wireless communication method such as a wireless LAN, Bluetooth (registered trademark), or LTE (registered trademark).
The communication unit 301a may communicate using a communication method such as a wired LAN. The communication unit 301a receives reservation request information transmitted from the terminal device. The reception unit 302a acquires the reservation request information from the communication unit 301a and accepts the acquired reservation request information.

The allocation unit 304a holds reservation status information indicating reserved and unreserved times for each of the first V2H device 320-1 to the second V2H device 320-2. The allocation unit 304a acquires reservation request information accepted by the acceptance unit 302a. The allocation unit 304a determines whether there are any unreserved V2H devices 320 on that date and time based on the user identification information, information specifying the parking lot, information specifying the supply category, date information, and time information included in the acquired reservation request.
When the allocation unit 304a determines that there is a V2H device 320 that has not been reserved for that date and time, it updates the reservation status information by allocating the unreserved V2H device 320 to the user (requester) who sent the reservation request information.
When the allocating unit 304a allocates an unreserved V2H device 320 to the user who transmitted the reservation request information, the allocating unit 304a creates reservation response information including information indicating that the reservation has been completed. On the other hand, when the allocating unit 304a is unable to allocate a V2H device 320 to the user who transmitted the reservation request information, the allocating unit 304a creates reservation response information including information indicating that the reservation has not been made. The allocating unit 304a transmits the created reservation response information to the user who transmitted the reservation request information.

Connection unit 340a has the following functions in addition to the functions of connection unit 340 described above. Connection unit 340a acquires reservation status information from allocation unit 304a. Based on the acquired reservation status information, connection unit 340a switches between first switch FSW and second switch SSW, thereby connecting cable CE from charging/discharging device CDD installed in a parking lot corresponding to the information specifying the parking lot to cable C from the supply division via either first V2H device 320-1 or second V2H device 320-2 assigned by allocation unit 304a.
The reception unit 302a, the allocation unit 304a, and the connection unit 340a are realized by, for example, a hardware processor such as a CPU executing a computer program (software) stored in a storage unit (not shown).
Furthermore, some or all of these functional units may be realized by hardware (including circuitry) such as an LSI, ASIC, FPGA, or GPU, or may be realized by a combination of software and hardware.

(Operation of the charge/discharge control system)
6 is a flowchart showing an example of the operation of the charge/discharge control system according to the modified example of the embodiment. Here, the operation will be described after a resident (requester) who wants to discharge the power stored in the battery of an electric vehicle EV parked in a parking lot PA and supply the discharged power to a supply section uses a terminal device (not shown) to create reservation request information for requesting the charge/discharge control system to reserve the V2H device 320 and the meter 310, and transmits the created reservation request information to the charge/discharge control system.
(Step S1-2)
In the charge/discharge control system, the communication unit 301a receives reservation request information transmitted from the terminal device. The reception unit 302a acquires the reservation request information from the communication unit 301a and accepts the acquired reservation request information.

(Step S2-2)
In the charge/discharge control system, the allocation unit 304a acquires reservation request information accepted by the acceptance unit 302a, and determines whether there are any unreserved V2H devices 320 for that date and time based on the user identification information, information specifying the parking lot, information specifying the supply category, date information, and time information included in the acquired reservation request. Based on the date information and time information included in the reservation request, the allocation unit 304a determines that reservation is possible if there are no reserved V2H devices 320 for that date and time, and determines that reservation is not possible if there are reserved V2H devices 320.
(Step S3-2)
In the charge/discharge control system, if it is determined in step S2-2 that reservation is not possible, the allocation unit 304a creates reservation response information including information indicating that reservation is not possible.
(Step S4-2)
In the charge/discharge control system, the allocation unit 304a transmits the created reservation response information, and then the process returns to step S1-2.

(Step S5-2)
In the charge/discharge control system, if it is determined in step S202 that reservation is possible, the allocation unit 304a makes a reservation by allocating an unreserved V2H device 320 to the user who sent the reservation request information.
(Step S6-2)
In the charge/discharge control system, when the allocation unit 304a allocates an unreserved V2H device 320 to a user who sent reservation request information, it creates reservation response information including information indicating that the reservation has been completed.
(Step S7-2)
In the charge/discharge control system, the allocation unit 304a transmits the created reservation response information to the user who transmitted the reservation request information.
(Step S8-2)
In the charge/discharge control system, the allocation unit 304a updates the reservation status information.
(Step S9-2)
In the charge/discharge control system, connection unit 340a acquires reservation status information from allocation unit 304a. Based on the acquired reservation status information, connection unit 340a switches first switch FSW and second switch SSW to connect cable CE from charging/discharging device CDD installed in a parking lot corresponding to the information specifying the parking lot to cable C from the supply division via either first V2H device 320-1 or second V2H device 320-2 assigned by allocation unit 304a.

In the modification of the embodiment described above, the case where the reception unit 302a and the allocation unit 304a are installed in the connection device 400 has been described, but the present invention is not limited to this example.
For example, the reception unit 302a and the allocation unit 304a may be installed in the common area 60, or may be installed in a location other than the common area 60, such as on a wall of the building BU.

According to the charge/discharge control system of the modified embodiment, the charge/discharge control system of the above-described embodiment further includes a reception unit 302a that receives reservation request information for requesting a reservation of a parking lot and V2H device 320, and an allocation unit 304a that allocates a parking lot and V2H device 320 to a reservation requester based on the reservation request information received by the reception unit 302a. The V2H device 320 allocated by the allocation unit 304a controls charging and discharging of an electric vehicle EV parked in the allocated parking lot.
With this configuration, the charge/discharge control system can include a reception unit 302a and an allocation unit 304a. The reception unit 302a receives reservation request information for requesting a reservation of a parking lot and a V2H device 320. The allocation unit 304a allocates a parking lot and a V2H device 320 to the reservation requester based on the reservation request information received by the reception unit 302a. Therefore, the V2H device 320 allocated by the allocation unit 304a can control the charging and discharging of an electric vehicle EV parked in the allocated parking lot.

In the charge/discharge control system described above, the reservation request information includes time information. By configuring the charge/discharge control system in this manner, the allocation unit 304a can allocate a parking space and a V2H device 320 to the reservation requester based on the time information included in the reservation request information received by the reception unit 302a. As a result, the V2H device 320 allocated by the allocation unit 304a can control the charging and discharging of an electric vehicle EV parked in the allocated parking space.

Although the embodiments have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, modifications, and combinations can be made without departing from the spirit of the invention.
The accompanying claims and their equivalents are intended to cover such embodiments as would fall within the scope and spirit of the invention.

As mentioned above, the above-mentioned connection device 400 is realized by including a computer.
In this case, a program for realizing the functions of each functional block is recorded on a computer-readable recording medium. The program recorded on this recording medium may be loaded into a computer system and executed by a CPU to realize the functions. The term "computer system" here includes the OS (Operating System) and hardware such as peripheral devices.
Furthermore, "computer-readable recording media" refers to portable media such as flexible disks, optical magnetic disks, ROMs, CD-ROMs, etc. "Computer-readable recording media" also includes storage devices such as hard disks built into computer systems.

Furthermore, the term "computer-readable recording medium" may include a medium that dynamically stores a program for a short period of time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line.
Furthermore, the "computer-readable recording medium" may also include something that stores a program for a certain period of time, such as volatile memory within a computer system that is a server or client.
The program may be for realizing part of the above-described functions, or may be capable of realizing the above-described functions in combination with a program already stored in the computer system.
The program may be implemented using a programmable logic device, such as a field programmable gate array (FPGA).

The above-mentioned connection device 400 has an internal computer. The processes of the above-mentioned connection device 400 are stored in the form of a program on a computer-readable recording medium, and the above-mentioned processes are performed by the computer reading and executing the program.
Here, computer-readable recording media refers to magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, semiconductor memories, etc. Furthermore, this computer program may be distributed to a computer via a communication line, and the computer that receives this distribution may execute the program.
The program may also be for realizing part of the above-mentioned functions.
Furthermore, the above-mentioned functions may be realized in combination with a program already recorded in the computer system, that is, a so-called differential file (differential program).

20 Residence 4 Electric power company 21 Distributed power source 22 First business operator 23 Electric vehicle 24 Consumer 25 Owner 26 Wholesale electricity market 27 Second business operator 28 Residence 29 First business operator's business establishment 33 Upper meter device 36 Lower meter device 30-1, 30-2, 30-3, 30-4, 30-5, 30-6 Consumer 50-1, 50-2, 50-3, 50-4, 50-5, 50-6 Section 60-1, 60-2 Common section 310-1 First meter 310-2 Second meter 320-1 First V2H device 320-2 Second V2H device 330 Selection section 340 Connection section 350 Operation section 400 Connection device 450 Connection section

Claims (8)

n (n is an integer greater than 0) V2H devices;
a selection unit that selects an unused V2H device from among the n V2H devices;
a connection unit that connects, via the V2H device selected by the selection unit, one of k (k is an integer greater than n) parking lots in which an electric vehicle requesting charging or discharging is parked, to one of m (m is an integer greater than n) sections included in a building, a supply section that supplies power from the battery of the electric vehicle or a power supply section that supplies power to the battery of the electric vehicle;
The V2H device selected by the selection unit supplies power from the battery of the electric vehicle to the supply section, or supplies power from the power supply section to the battery of the electric vehicle. The charge/discharge control system of claim 1, wherein the connection unit releases the connection via the V2H device selected by the selection unit when the V2H device selected by the selection unit has finished supplying power from the battery of the electric vehicle to the supply section, or when the power supply from the power supply section to the battery of the electric vehicle has finished. the connection unit connects a first parking lot where a first electric vehicle requesting charging is parked and a second parking lot where a second electric vehicle requesting discharging is parked via the V2H device selected by the selection unit;
3 . The charge/discharge control system according to claim 1 , wherein the V2H device selected by the selection unit supplies electric power from the battery of the first electric vehicle to the battery of the second electric vehicle. The charge/discharge control system of claim 3, wherein the connection unit terminates the connection via the V2H device selected by the selection unit when the V2H device selected by the selection unit has finished supplying power from the battery of the first electric vehicle to the battery of the second electric vehicle. The charge/discharge control system described in any one of claims 1 to 4, wherein the V2H device selected by the selection unit supplies power generated by a distributed power source from the power supply section to the battery of the electric vehicle. a reception unit that receives reservation request information for requesting a reservation for a parking lot and a V2H device;
an allocation unit that allocates a parking space and a V2H device to the reservation requester based on the reservation request information received by the reception unit,
The charge/discharge control system according to claim 1 , wherein the V2H device allocated by the allocation unit controls charging/discharging of an electric vehicle parked in the allocated parking lot. The charge/discharge control system of claim 6, wherein the reservation request information includes time information. a selection unit selecting an unused V2H device from among n (n is an integer greater than 0) V2H devices;
a connection unit connecting, via the V2H device selected in the selecting step, a parking lot where an electric vehicle requesting charging or discharging is parked among k (k is an integer greater than n) parking lots, to a supply section that supplies power from the battery of the electric vehicle or a power supply section that supplies power to the battery of the electric vehicle among m (m is an integer greater than n) sections included in a building;
a step of causing the V2H device selected in the selecting step to supply power from the battery of the electric vehicle to the supply section, or supply power from the power supply section to the battery of the electric vehicle.