Method for controlling storage battery system

Patent metadata

Field	Value
Publication number	US-2018183239-A1
Application number	US-201815901262-A
Country	US
Kind code	A1
Filing date	Feb 21, 2018
Priority date	Aug 26, 2015
Publication date	Jun 28, 2018
Grant date	—

Abstract

A storage battery system control method includes at least the following steps. Respective current SOC (state of charge) values of the large capacity storage battery system and the high power storage battery system are acquired. Electrical power, which is required to operate the frequency control service for the purpose of suppressing frequency fluctuations, to the large capacity storage battery system and the high power storage battery system, in accordance with the respective SOC values. The respectively allocated electrical power is charged or discharged by driving the large capacity storage battery system, or alternatively, the high power storage battery system, or alternatively, the large capacity storage battery system and the high power storage battery system.

First claim

What is claimed is:

1 . A storage battery system control method including operation utilized in implementing a frequency control service for the purpose of suppressing frequency fluctuations in an AC electrical power system, by combining a large capacity storage battery system which is capable of storing a large amount of electrical power, and a high power storage battery system which is capable of outputting high power;
wherein the operation utilized in implementing the frequency control service includes at least: an SOC acquiring step of acquiring respective current state of charge values of the large capacity storage battery system and the high power storage battery system; an electrical power allocating step of allocating electrical power, which is required to operate the frequency control service for suppressing frequency fluctuations, to the large capacity storage battery system and the high power storage battery system, in accordance with the respective SOC values acquired in the SOC acquiring step; and a storage battery driving step of charging or discharging the respectively allocated electrical power by driving the large capacity storage battery system, or alternatively, the high power storage battery system, or alternatively, the large capacity storage battery system and the high power storage battery system, and wherein: if the electrical power required to operate the frequency control service is an electrical power in a discharging direction, then in the electrical power allocating step, the electrical power in the discharging direction is preferentially allocated to the large capacity storage battery system; and if the electrical power required to operate the frequency control service is an electrical power in a charging direction, then in the electrical power allocating step, the electrical power in the charging direction is preferentially allocated to the high power storage battery system.

2 . A storage battery system control method including operation utilized in implementing a frequency control service for the purpose of suppressing frequency fluctuations in an AC electrical power system, by combining a large capacity storage battery system which is capable of storing a large amount of electrical power, and a high power storage battery system which is capable of outputting high power;
wherein the operation utilized in implementing the frequency control service includes at least: an SOC acquiring step of acquiring respective current state of charge values of the large capacity storage battery system and the high power storage battery system; an electrical power allocating step of allocating electrical power, which is required to operate the frequency control service for suppressing frequency fluctuations, to the large capacity storage battery system and the high power storage battery system, in accordance with the respective SOC values acquired in the SOC acquiring step; and a storage battery driving step of charging or discharging the respectively allocated electrical power by driving the large capacity storage battery system, or alternatively, the high power storage battery system, or alternatively, the large capacity storage battery system and the high power storage battery system, wherein a plurality of units in which the large capacity storage battery system and the high power storage battery system are combined are provided, the method further comprises a distributed control step of distributing and allocating the electrical power required to operate the frequency control service to two or more of the units, and in the electrical power allocating step of the respective units, the electrical power allocated in the distributed control step is allocated to the large capacity storage battery system and the high power storage battery system in accordance with the respective SOC values acquired in the SOC acquiring step, and wherein, if the electrical power required to operate the frequency control services is an electrical power in a discharging direction, the electrical power required for the frequency control is distributed and allocated to two or more units for which the SOC value of at least the large capacity storage battery system is within an appropriate range, from among the plurality of units.

3 . The storage battery system control method according to claim 1 , wherein, in the electrical power allocating step, the electrical power required to operate the frequency control service is divided in accordance with the respective SOC values acquired in the SOC acquiring step, and allocated to the large capacity storage battery system and the high power storage battery system.

4 . The storage battery system control method according to claim 2 , wherein:
if the electrical power required to operate the frequency control service is an electrical power in a discharging direction, then in the electrical power allocating step, the electrical power in the discharging direction is preferentially allocated to the large capacity storage battery system; and if the electrical power required to operate the frequency control service is an electrical power in a charging direction, then in the electrical power allocating step, the electrical power in the charging direction is preferentially allocated to the high power storage battery system.

5 . The storage battery system control method according to claim 1 , wherein, if the electrical power required to operate the frequency control service is insufficient to serve as the electrical power allocated to the large capacity storage battery system, a logic is provided for increasing an allocation of the high power storage battery system in order to compensate for the insufficiency.

6 . The storage battery system control method according to claim 1 , wherein:
if the electrical power required to operate the frequency control service is an electrical power in a discharging direction, then in the electrical power allocating step, the electrical power in the discharging direction is allocated to the storage battery system having a higher SOC value from among the large capacity storage battery system and the high power storage battery system; and if the electrical power required to operate the frequency control service is an electrical power in a charging direction, then in the electrical power allocating step, the electrical power in the charging direction is allocated to the storage battery system having a lower SOC value from among the large capacity storage battery system and the high power storage battery system.

7 . The storage battery system control method according to claim 1 , further including a depth management step of transferring stored energy of the large capacity storage battery system to the high power storage battery system, and maintaining a depth of the high power storage battery system within an appropriate range.

8 . The storage battery system control method according to claim 1 , wherein a plurality of units in which the large capacity storage battery system and the high power storage battery system are combined are provided,
the method further comprises a distributed control step of distributing and allocating the electrical power required to operate the frequency control service to two or more of the units, and in the electrical power allocating step of the respective units, the electrical power allocated in the distributed control step is allocated to the large capacity storage battery system and the high power storage battery system in accordance with the respective SOC values acquired in the SOC acquiring step.

9 . The storage battery system control method according to claim 8 , wherein, if the electrical power required to operate the fr

Assignees

• Tokyo Electric Power Co Holdings Inc
• Ngk Insulators Ltd

Inventors

• Shibata Takayuki
• Kimura Youko
• Tashiro Yoichiro
• KUROKAWA Masataka

Classifications

• H02J7/855

  with circuits adapted for supplying loads from the battery · CPC title

• H02J7/96

  in response to battery voltage · CPC title

• H02J7/82

  Control of state of charge [SOC] · CPC title

• H02J7/50

  acting upon multiple batteries simultaneously or sequentially · CPC title

• H02J3/32 Primary

  using batteries or super capacitors with converting means · CPC title