Storage battery control device and storage battery control method

• US 9,793,723 B2
• Filed: 11/19/2012
• Issued: 10/17/2017
• Est. Priority Date: 11/19/2012
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Tomita, Taminori, Shiga, Yasuko, Ishida, Takaharu, Nakano, Michiki
• Primary Examiner(s): Muralidar, Richard V
• Application Number:
  US14/426,307
• Publication Number:
  US 20150249350A1
• Time in Patent Office: 1,793 Days
• Field of Search: 320128, 320134-136
• CPC Class Codes: H01M 10/441 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 10/482 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H02J 13/00007 using the power network as support for the transmission
• CPC Class Codes: H02J 13/00026 involving a local wireless network, e.g. Wi-Fi, ZigBee or Bluetooth
• CPC Class Codes: H02J 2300/10 The dispersed energy generation being of fossil origin, e.g. diesel generators
• CPC Class Codes: H02J 2300/24 of photovoltaic origin
• CPC Class Codes: H02J 2300/30 The power source being a fuel cell
• CPC Class Codes: H02J 3/32 using batteries with converting means
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 3/46 Controlling of the sharing of output between the generators, converters, or transformers
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/34 Parallel operation in networks using both storage and other dc sources, e.g. providing buffering H02J7/14 takes precedence
• CPC Class Codes: H02J 7/35 with light sensitive cells
• CPC Class Codes: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers
• CPC Class Codes: Y02E 40/70 Smart grids as climate change mitigation technology in the energy generation sector
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 70/30 Systems combining energy storage with energy generation of non-fossil origin
• CPC Class Codes: Y02P 90/50 Energy storage in industry with an added climate change mitigation effect
• CPC Class Codes: Y04S 10/12 Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
• CPC Class Codes: Y04S 10/123 : the energy generation units being or involving renewable energy sources
• CPC Class Codes: Y04S 10/14 : Energy storage units
• CPC Class Codes: Y04S 10/50 : Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
• CPC Class Codes: Y04S 40/121 : using the power network as support for the transmission
• CPC Class Codes: Y04S 40/126 : using wireless data transmission

Abstract

A plurality of storage battery modules include storage battery control devices that can mutually communicate with each other and obtain a demand for electric power in a predetermined consumer in which the plurality of storage battery modules are provided. The storage battery control devices mutually transmit and receive charging/discharging electric power of the storage batteries and control charging/discharging of the plurality of storage battery modules, respectively, on the basis of the demand for electric power in the predetermined consumer.

Claims

1. A storage battery control device comprising:

a charging/discharging control unit configured to acquire a demand for electric power in a consumer to which a storage battery is provided; and

a communication unit configured to acquire a charging/discharging electric power amount of another storage battery provided to the consumer, wherein

the charging/discharging control unit is configured to control charging/discharging of the storage battery based on the charging/discharging electric power amount of the another storage battery and the demand for electric power in the consumer,

wherein the charging/discharging control unit is configured to manage a threshold value of an electric power amount of the storage battery to determine whether the charging/discharging control unit is to allow charging or discharging of the storage battery,

wherein;

when the threshold value is greater than the demand for electric power, the charging/discharging control unit is configured to allow charging of the storage battery and prohibit discharging; and

when the threshold value is less than or equal to the demand for electric power, the charging/discharging control unit is configured to prohibit charging of the storage battery and allow discharging.

2. The storage battery control device according to claim 1, wherein

the charging/discharging control unit is configured to acquire electric power flow data at a linkage point between the consumer and an electric power system;

and

the charging/discharging control unit is configured to estimate the demand for electric power in the consumer based on the electric power flow data, the charging/discharging electric power amount of the another storage battery, and a charging/discharging electric power amount of the storage battery.

3. The storage battery control device according to claim 1, wherein

the charging/discharging control unit is configured to control charging/discharging of the storage battery based on a charge amount of the storage battery.

4. The storage battery control device according to claim 3, wherein

the charging/discharging control unit is configured to allow charging of the storage battery when the charge amount of the storage battery is less than or equal to a predetermined charge amount;

and

the charging/discharging control unit is configured to prohibit charging of the storage battery when the charged amount of the storage battery is greater than the predetermined charged amount.

5. The storage battery control device according to claim 1, wherein

the charging/discharging control unit is configured to estimate the threshold value based on past demand for electric power in the consumer.

6. The storage battery control device according to claim 1, wherein

the charging/discharging control unit is configured to change the threshold value based on whether a power generation amount of a private power generator provided to the consumer exceeds the threshold value.

7. The storage battery control device according to claim 1, wherein

the charging/discharging control unit is configured to control charging/discharging of the storage battery based on information of an electricity rate at a time the charging/discharging control unit is determining whether to allow charging or discharging of the storage battery.

8. The storage battery control device according to claim 1, wherein

the communication unit is configured to transmit the charging/discharging electric power amount of the storage battery to another storage battery control device controlling the another storage battery.

9. A method for controlling charging/discharging of a storage battery, the method comprising:

acquiring, via a charging/discharging control unit, a demand for electric power in a consumer to which a storage battery is provided;

acquiring, via a communication unit, a charging/discharging electric power amount of another storage batter provided to the consumer;

controlling, via the charging/discharging control unit, charging/discharging of the storage battery, based on the charging/discharging electric power amount of the another storage battery and the demand for electric power in the consumer;

managing, via the charging/discharging control unit, a threshold value of an electric power amount of the storage battery to determine whether the charging/discharging control unit is to allow charging or discharging of the storage battery;

when the threshold value is greater than the demand for electric power, via the charging/discharging control unit, allowing charging of the storage battery and prohibiting discharging; and

when the threshold value is less than or equal to the demand for electric power, via the charging/discharging control unit, prohibiting charging of the storage battery and allowing discharging.