Method for controlling storage battery system

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.