JP5990786B2 - Charge / discharge system - Google Patents

Charge / discharge system Download PDF

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JP5990786B2
JP5990786B2 JP2012195378A JP2012195378A JP5990786B2 JP 5990786 B2 JP5990786 B2 JP 5990786B2 JP 2012195378 A JP2012195378 A JP 2012195378A JP 2012195378 A JP2012195378 A JP 2012195378A JP 5990786 B2 JP5990786 B2 JP 5990786B2
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power
charge
storage battery
external
discharge
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JP2014054022A (en
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田中 健一
健一 田中
昇 伊津
昇 伊津
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株式会社キャプテックス
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries

Description

  The present invention relates to a charge / discharge system that is connected to a commercial power source and configured to charge / discharge a plurality of storage batteries.

  For example, as an infrastructure for an electric vehicle or a hybrid vehicle, a charging stand for charging a storage battery of these vehicles is installed. The charger at the charging station is not only supplied with electric power from a commercial power source that is alternating current, but also may be supplied with electric power generated by the photovoltaic power generation panel.

For example, in the electric vehicle quick charging facility in the outdoor parking lot of Patent Document 1, the power generated by the solar panel is stored in a storage battery, and the power is supplied from the storage battery to a charger that charges the electric vehicle. Has been. In addition, power is supplied to the charger from an AC power supply, and the power generated by the solar panel can be supplied to the AC power supply.
Further, for example, in the electric vehicle charging device disclosed in Patent Document 2, when supplying electric power to a battery mounted on a parked electric vehicle, the supply of electric power from the charger to the battery is controlled. It is described that the charging information is centrally managed.

Utility Model Registration No. 3165170 JP-A-5-227668

  However, Patent Document 1 does not show any specific configuration for supplying power from a commercial power source to a storage battery and from the storage battery to a charger. Moreover, in patent document 2, only the general structure which charges a battery from a charger is shown. Therefore, further ingenuity is required in order to stably supply the power generated by solar power to the storage battery and the electric vehicle with the minimum control.

  The present invention has been made in view of such a background, and has been obtained in an attempt to provide a charge / discharge system capable of stably supplying photovoltaic power to a storage battery and an electric vehicle with minimal control. It is.

One aspect of the present invention is connected to a storage battery whose state is managed by a battery management unit, and a plurality of bidirectional power supplies capable of charging and discharging the storage battery,
A DC bus in which the plurality of bidirectional power supplies are connected in parallel;
A grid-connected power source connected to a commercial AC power source, configured to convert AC power to DC power and supply DC power to the DC bus;
A solar panel that is connected to the grid-connected power source via a power conditioner that converts DC power into AC power, and that performs solar power generation;
When a signal indicating that the amount of charge is less than a specified amount is received from one of the battery management units connected to each of the plurality of storage batteries , DC power is supplied from the grid-connected power source to the DC bus. On the other hand, when a signal indicating that the charge amount satisfies the specified amount is received from all of the battery management units respectively connected to the plurality of storage batteries, from the grid-connected power source to the storage battery via the DC bus The DC power supply is configured to be cut off, and the AC power transmitted from the solar panel is switched to be supplied to the grid-connected power source or sold to the commercial AC power source. A control unit configured to:
An external DC charger provided on the DC bus and capable of connecting an electric vehicle;
When direct-current power is supplied from the grid-connected power supply to the direct-current bus, the direct-current power is charged to the storage battery whose charge amount is less than a specified amount,
When the electric vehicle is connected to the external DC charger, if there is a storage battery whose charge amount is less than a specified amount, the storage battery continues to be charged and the storage battery satisfies the specified amount. The charging / discharging system is characterized in that the stored DC power is discharged to the external DC charger and charged from the external DC charger to the electric vehicle.

  In the charging / discharging system, a plurality of storage batteries connected to the DC bus are charged by controlling the grid-connected power supply by the control unit. The grid-connected power supply can be supplied with power generated by a solar panel. In addition, each bidirectional power source connected to each storage battery can charge each storage battery and discharge from each storage battery.

In the charge / discharge system, when the amount of charge in at least one of the storage batteries is less than the specified amount, a signal indicating this is transmitted from the battery management unit in the storage battery to the control unit. The control unit supplies DC power from the grid-connected power supply to the DC bus. At this time, direct current power is charged from the direct current bus to the storage battery whose charge amount is less than the specified amount.
Moreover, when the charge amount in all the storage batteries satisfy | fills regulation amount, the signal which shows this is transmitted to the control unit from the battery management part in this storage battery. At this time, the control unit cuts off the supply of DC power from the grid-connected power supply to the storage battery via the DC bus.

When an electric vehicle is connected to the external DC charger, one of the bidirectional power supplies discharges, and DC power is discharged from the storage battery to which the bidirectional power supply is connected to the external DC charger. Thus, the power supplied from the commercial AC power supply or the power generated by photovoltaic power generation is supplied to the grid-connected power supply, and the power is supplied from the grid-connected power supply to the storage battery and the electric vehicle without performing special control. be able to.
Therefore, according to the charge / discharge system, it is possible to stably supply the power generated by solar power to the storage battery and the electric vehicle with the minimum control.

BRIEF DESCRIPTION OF THE DRAWINGS The block diagram which shows schematically the charging / discharging system concerning Example 1. FIG. The block diagram which shows schematically the charging / discharging system concerning Example 2. FIG.

A preferred embodiment of the above-described charge / discharge system will be described.
In the charging / discharging system, the electric vehicle only needs to charge a vehicle battery and travel using a motor, and includes hybrid vehicles and other electric vehicles.
Moreover, you may be comprised so that DC power may be supplied to the said external DC charger from both the said storage battery and the said grid connection power supply (Claim 2).
In this case, by directly supplying DC power from the grid-connected power supply to the external DC charger, it is possible to charge the electric vehicle connected to the external DC charger more stably.
In addition, the electric vehicle can be charged with all of the electric power stored in the storage battery and the electric power supplied from the grid interconnection power source.

The AC bus to which the commercial AC power supply and the power conditioner are connected is provided with an external AC charger to which an AC load can be connected. The control unit is connected to the external AC charger. When the load is connected, the AC load may be switched from the commercial AC power source or the solar panel to which AC power is supplied (Claim 3).
In this case, in the charge / discharge system, the AC load can be stably charged.
Moreover, according to the amount of AC power required for the AC load, the control unit can be configured to supply AC power from both the commercial AC power source and the solar panel to the external AC charger.

Further, the control unit may be configured to switch between the grid-connected power source and the commercial AC power source or the power conditioner (Claim 4).
In this case, it is possible to stabilize the operation of the charge / discharge system by supplying the power generated by photovoltaic power generation to either the grid interconnection power supply or the commercial AC power supply.
Moreover, according to the electric energy requested | required of an electric vehicle or an external AC apparatus, a control unit can also electrically connect a grid connection power supply to both a commercial AC power supply and a power conditioner.

A plurality of the external DC chargers are provided in parallel in the DC bus, and the plurality of external DC chargers measure the amount of DC power charged from the DC bus to the electric vehicle. A charge meter may be provided (claim 5).
In this case, it is possible to simultaneously charge DC power from a plurality of storage batteries to an electric vehicle connected to a plurality of external DC chargers. Moreover, the amount of DC power charged to each electric vehicle can be measured with a charge meter, and the amount of power used can be settled for each electric vehicle or for each consumer.

Further, when the electric vehicle is connected to the external DC charger, DC power may be supplied from the electric vehicle to the storage battery via the external DC charger.
When the amount of charge in the electric vehicle is sufficient, power can be charged from the electric vehicle to the storage battery to increase the utilization efficiency of the charge / discharge system.

The grid-connected power source and the control unit are provided in a power management assembly constituted by a plurality of consumers consuming DC power, and the bidirectional power source and the storage battery are provided in each consumer. (Claim 7).
In this case, the DC load provided to each consumer can be operated using each bidirectional power source and storage battery in the power management assembly.

Hereinafter, embodiments of the charge / discharge system will be described with reference to the drawings.
Example 1
As shown in FIG. 1, the charge / discharge system 1 of this example includes a bidirectional power supply 32, a DC bus 31, a grid interconnection power supply 3, a solar panel 22, a control unit 4, and an external DC charger 35.
A storage battery 33 whose state is managed by a battery management unit 34 is connected to the bidirectional power source 32. The bidirectional power source 32 can charge and discharge the storage battery 33. The DC bus 31 has a plurality of bidirectional power supplies 32 connected in parallel to the grid interconnection power supply 3. The grid interconnection power supply 3 is connected to the commercial AC power supply 2 and is configured to convert the AC power AC to the DC power DC and supply the DC power DC to the DC bus 31. The solar panel 22 is connected to the grid-connected power supply 3 via a power conditioner 23 that converts DC power DC into AC power AC.

When the control unit 4 receives a signal indicating that the charge amount is less than the specified amount from any one of the battery management units 34 respectively connected to the plurality of storage batteries 33, the control unit 4 transfers from the grid interconnection power supply 3 to the DC bus 31. It is configured to supply DC power DC. On the other hand, when the control unit 4 receives a signal indicating that the charge amount satisfies the specified amount from all of the battery management units 34 respectively connected to the plurality of storage batteries 33, the control unit 4 connects the DC bus 31 from the grid interconnection power supply 3. It is comprised so that supply of direct-current power DC to storage battery 33 may be interrupted. At this time, the control unit 4 is configured to switch between supplying AC power AC transmitted from the solar panel 22 to the grid interconnection power supply 3 or selling power to the commercial AC power supply 2. ing. The external DC charger 35 is provided in the DC bus 31 and can be connected to a charging cable for the electric vehicle 36.

  The charging / discharging system 1 is configured to charge the direct current power DC to the storage battery 33 whose charge amount is less than a prescribed amount when the direct current power DC is supplied from the grid connection power supply 3 to the direct current bus 31. When the charging cable of the electric vehicle 36 is connected to the external DC charger 35, the charge / discharge system 1 uses the DC power DC from the grid interconnection power supply 3 or the DC power DC stored in the storage battery 33 as an external DC charger. The electric vehicle 36 is discharged from the external DC charger 35 and charged to the electric vehicle 36.

Hereinafter, the charge / discharge system 1 of this example will be described in detail with reference to FIG.
The charging / discharging system 1 of this example stably stabilizes the electric power generated by solar power to the storage battery 33, the electric vehicle 36, and the AC load 25 in a parking lot where an electric vehicle 36 including a hybrid vehicle is parked. It is configured to supply. Each storage battery 33 connected to the DC bus 31 is formed using a lithium ion battery as a chargeable / dischargeable secondary battery. The storage battery 33 can take various forms such as a laminate cell battery and a cylindrical battery, and is configured by connecting a plurality of lithium ion batteries in parallel and in series. In addition to the lithium ion battery, the storage battery 33 may be a nickel cadmium storage battery 33, a nickel hydride battery, a lead battery, or the like as a secondary battery.

The grid interconnection power supply 3 charges the storage battery 33 via the bidirectional power supply 32 and the function of an AC / DC converter that converts AC power AC supplied from the commercial AC power supply 2 into DC power DC. And the function of a charger.
The bidirectional power source 32 has a function of a DC / DC converter that converts DC power DC sent from the grid interconnection power source 3 into a charge voltage for charging the storage battery 33, and charging from the grid interconnection power source 3 to the storage battery 33. And a function of switching between discharging from the storage battery 33 to the external DC charger 35.

The battery management unit 34 of each storage battery 33 measures and manages battery voltage, and measures and manages charge current, discharge current, battery temperature, disconnection information, overcharge, overdischarge, and the like.
The bidirectional power source 32 is configured to perform data communication with the battery management unit 34, receive battery voltage data of the storage battery 33 measured by the battery management unit 34, and switch between charging and discharging.
The control unit 4 is configured to perform data communication with the battery management unit 34, grasp various states of the storage battery 33, and transmit charging and discharging control commands in each storage battery 33 to each bidirectional power supply 32. . The control unit 4 recognizes safety performance, charge characteristics, discharge characteristics, temperature characteristics, etc. of each storage battery 33 by analyzing the data stored in the battery management unit 34 of the storage battery 33, and determines the overall performance of each storage battery 33. It is configured to judge.

As shown in FIG. 1, the power conditioner 23 is connected to each solar panel 22, and the plurality of power conditioners 23 are connected to the grid interconnection power supply 3 via the AC bus 21. The plurality of power conditioners 23 are also connected to the commercial AC power supply 2 via the AC bus 21.
The control unit 4 is configured to switch between supplying AC power AC transmitted from the solar panel 22 to the grid interconnection power supply 3 or selling power to the commercial AC power supply 2.

  A plurality of external DC chargers 35 are provided in parallel in the DC bus 31. The plurality of external DC chargers 35 are provided with a charge meter 37 that measures the amount of DC power charged from the DC bus 31 to the electric vehicle 36. The control unit 4 is configured to acquire data on the amount of DC power charged in the electric vehicle 36 from the charge meter 37 and to settle the used power with the owner of each electric vehicle 36 or each consumer. When the electric vehicle 36 is connected to each of the plurality of external DC chargers 35, the control unit 4 is simultaneously connected to the plurality of electric vehicles 36 from the plurality of storage batteries 33 via the bidirectional power sources 32. Alternatively, direct-current power DC can be charged directly from the grid interconnection power supply 3.

  As shown in FIG. 1, the AC bus 21 is provided with an external AC charger 24 to which an AC load 25 can be connected. The control unit 4 has a function of switching the flow of AC power AC in the AC bus 21. When the AC load 25 is connected to the external AC charger 24, the control unit 4 switches whether the AC power AC is supplied from the commercial AC power source 2 or the solar panel 22 to the AC load 25. It is configured as follows. Further, according to the amount of AC power required for the AC load 25, the control unit 4 can also supply AC power AC from both the commercial AC power source 2 and the solar panel 22 to the external AC charger 24.

  In the AC bus 21, a portion connected to the commercial AC power source 2 includes a power supply amount (amount of power purchased) from the commercial AC power source 2 to the charge / discharge system 1 and a power supply amount from the charge / discharge system 1 to the commercial AC power source 2 ( A smart meter 26 for measuring the amount of electricity sold) is provided. Data measured by the smart meter 26 is transmitted to the control unit 4 or a central controller connected to the control unit 4, and used power is settled with the power company.

  The control unit 4 includes a unit price of AC power AC supplied from the commercial AC power source 2 to the grid-connected power source 3 that serves as a standard for power trading with the power company that supplies the commercial AC power source 2. Information on the unit price of AC power AC supplied from the plurality of power conditioners 23 to the commercial AC power supply 2 is stored. The power purchase unit price is set to be cheaper at night (for example, 22:00 to 8:00) than in the daytime (for example, 8:00 to 22:00). The solar panel 22 generates power mainly during the daytime.

Therefore, when the amount of charge in at least one of the storage batteries 33 is less than the specified amount, and there is approximately sunshine, the control unit 4 connects the grid-connected power supply 3 to the power conditioner 23, and the solar panel 22. One of the storage batteries 33 is charged with the electric power generated by. On the other hand, when the charge amount in at least one of the storage batteries 33 is less than the specified amount, and when there is no sunshine, such as at night, the control unit 4 connects the grid-connected power source 3 to the commercial AC power source 2 to One of the above storage batteries 33 is charged with electric power from the AC power source 2.
Moreover, according to the electric energy requested | required of the electric vehicle 36 or the external alternating current apparatus 25, the control unit 4 can also connect the grid connection power supply 3 to both the commercial alternating current power supply 2 and the power conditioner 23. FIG.

  The external DC charger 35 is configured to be supplied with DC power DC from either the storage battery 33 or the grid interconnection power supply 3. The supply of the direct-current power DC is not performed by the control unit 4 and can be easily performed using a voltage difference between the grid-connected power supply 3 or the storage battery 33 and the storage battery in the electric vehicle 36. As a result, the electric vehicle 36 connected to the external DC charger 35 can be stably charged regardless of the state of charge of the plurality of storage batteries 33.

  In the charging / discharging system 1 of this example, the control unit 4 controls the grid interconnection power supply 3 to charge a plurality of storage batteries 33 connected to the DC bus 31. The grid-connected power supply 3 can be supplied with power generated by solar power generation using the solar panel 22. In addition, each bidirectional battery 32 connected to each storage battery 33 can be charged into and discharged from each storage battery 33.

In the charge / discharge system 1, when the amount of charge in at least one of the storage batteries 33 is less than the specified amount, a signal indicating this is transmitted from the battery management unit 34 in the storage battery 33 to the control unit 4. The control unit 4 supplies DC power DC from the grid interconnection power supply 3 to the DC bus 31. At this time, direct current power DC is charged from the direct current bus 31 to the storage battery 33 whose charge amount is less than the prescribed amount.
Further, when the charge amount in all the storage batteries 33 satisfies the specified amount, a signal indicating this is transmitted from the battery management unit 34 in the storage battery 33 to the control unit 4. At this time, the control unit 4 cuts off the supply of DC power DC from the grid-connected power supply 3 to the storage battery 33 via the DC bus 31.

When the electric vehicle 36 is connected to the external DC charger 35, any one of the bidirectional power sources 32 discharges, and the DC power DC is transferred from the storage battery 33 to which the bidirectional power source 32 is connected to the external DC charger 35. Is discharged. Thus, the power supplied from the commercial AC power supply 2 or the power generated by solar power generation is supplied to the grid interconnection power supply 3, and special control is performed from the grid interconnection power supply 3 to the storage battery 33 and the electric vehicle 36. Power can be supplied.
Therefore, according to the charging / discharging system 1 of the present example, the power generated by solar power can be stably supplied to the storage battery 33, the electric vehicle 36, and the AC load 25 with a minimum control.

(Example 2)
This example shows the example which employ | adopted the charging / discharging system 1 to the electric power management aggregate | assembly 10 comprised by the some consumer 5 which consumes direct-current power DC as shown in FIG.
The grid interconnection power supply 3 and the control unit 4 in this example are provided in the power management assembly 10. The power management aggregate 10 can be an area where a plurality of houses are gathered or a condominium provided with a plurality of rooms where residents live. Each consumer 5 is provided with a DC load 38 that operates with DC power DC. The bidirectional power supply 32 and the storage battery 33 are provided in each consumer 5, and the DC load 38 is connected to the storage battery 33.

  In this example, the charge / discharge system 1 is employed in the power management assembly 10, and the DC load DC provided in each consumer 5 is used in the power management assembly 10 using each bidirectional power source 32 and storage battery 33. Can be operated. Also in this example, the other structure of the charging / discharging system 1 is the same as that of the said Example 1, and can obtain the effect similar to the said Example 1. FIG.

DESCRIPTION OF SYMBOLS 1 Charging / discharging system 2 Commercial AC power supply 21 AC bus 22 Solar panel 23 Power conditioner 24 External AC charger 25 AC load 3 Grid connection power supply 31 DC bus 32 Bidirectional power supply 33 Storage battery 34 Battery management part 35 External DC charger 36 Electric vehicle 37 Charge meter 4 Control unit

Claims (7)

  1. A storage battery whose state is managed by the battery management unit is connected, and a plurality of bidirectional power sources capable of charging and discharging the storage battery,
    A DC bus in which the plurality of bidirectional power supplies are connected in parallel;
    A grid-connected power source connected to a commercial AC power source, configured to convert AC power to DC power and supply DC power to the DC bus;
    A solar panel that is connected to the grid-connected power source via a power conditioner that converts DC power into AC power, and that performs solar power generation;
    When a signal indicating that the amount of charge is less than a specified amount is received from one of the battery management units connected to each of the plurality of storage batteries , DC power is supplied from the grid-connected power source to the DC bus. On the other hand, when a signal indicating that the charge amount satisfies the specified amount is received from all of the battery management units respectively connected to the plurality of storage batteries, from the grid-connected power source to the storage battery via the DC bus The DC power supply is configured to be cut off, and the AC power transmitted from the solar panel is switched to be supplied to the grid-connected power source or sold to the commercial AC power source. A control unit configured to:
    An external DC charger provided on the DC bus and capable of connecting an electric vehicle;
    When direct-current power is supplied from the grid-connected power supply to the direct-current bus, the direct-current power is charged to the storage battery whose charge amount is less than a specified amount,
    When the electric vehicle is connected to the external DC charger, if there is a storage battery whose charge amount is less than a specified amount, the storage battery continues to be charged and the storage battery satisfies the specified amount. A charge / discharge system configured to discharge the stored DC power to the external DC charger and to charge the electric vehicle from the external DC charger.
  2. 2. The charge / discharge system according to claim 1, wherein the external DC charger is configured to be supplied with DC power from any of the storage battery and the grid-connected power supply that satisfy a specified charge amount . Charging / discharging system characterized by
  3. In the charge / discharge system according to claim 1 or 2, an external AC charger to which an AC load can be connected is provided on the AC bus to which the commercial AC power supply and the power conditioner are connected.
    The control unit is configured to switch whether the AC power is supplied from the commercial AC power source or the solar panel to the AC load when the AC load is connected to the external AC charger. Charge and discharge system characterized by being made.
  4.   The charge / discharge system according to any one of claims 1 to 3, wherein the control unit performs switching between connection of the grid-connected power supply to the commercial AC power supply and the power conditioner. It is comprised, The charging / discharging system characterized by the above-mentioned.
  5.   5. The charge / discharge system according to claim 1, wherein a plurality of the external DC chargers are provided in parallel in the DC bus, and the plurality of external DC chargers include: A charge / discharge system comprising a charge meter for measuring the amount of DC power charged from the DC bus to the electric vehicle.
  6.   The charge / discharge system according to any one of claims 1 to 5, wherein when the electric vehicle is connected to the external DC charger, DC power is supplied from the electric vehicle to the storage battery via the external DC charger. It is possible to supply a charge / discharge system.
  7.   The charging / discharging system according to any one of claims 1 to 6, wherein the grid-connected power supply and the control unit are provided in a power management assembly configured by a plurality of consumers that consume DC power. The charge / discharge system is characterized in that the bidirectional power supply and the storage battery are provided in each consumer.
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