A control method and device for an energy storage system

Abstract

The embodiment of the present application discloses a control method for an energy storage system, including: obtaining a system power command; determining the charging and discharging state corresponding to the system power command; if the charging and discharging state corresponds to the charging state, entering the charging distribution logic; the charging distribution logic includes: The battery cluster whose state of charge SOC value is higher than the average SOC value is assigned the cluster power instruction corresponding to the reduced charging power, and the battery cluster whose SOC value is lower than the average SOC value is assigned the corresponding charging power increased cluster power instruction; if The charge and discharge state corresponds to the discharge state, and enters the discharge distribution logic; the discharge distribution logic includes: assigning the corresponding discharge power to the battery cluster whose SOC value is higher than the average SOC value, and assigning the corresponding discharge power to the battery cluster whose SOC value is lower than the average value. SOC value battery cluster allocation corresponding to the cluster power command with reduced discharge power; solves the technical problem that the existing equalization methods are all aimed at the SOC balance of the battery cells in the cluster, and lack the control method for the energy storage system inter-cluster balance .

Description

technical field [0001] The present application relates to the technical field of energy storage control, in particular to an energy storage system control method and equipment. Background technique [0002] Due to the complex structure of a large-capacity energy storage system, the energy storage units in it are usually clustered and managed, even if the batteries are connected in series to form a high-current and high-voltage battery cluster, and each battery cluster further constitutes the entire storage system. energy system. [0003] In order to improve the durability, reliability and safety of the energy storage system, in addition to the state of charge SOC balance between the battery cells in the battery cluster, for the overall energy storage system, it is also necessary to achieve SOC balance. Especially when the power output demand of the energy storage system is close to or even exceeds the rated power of the energy storage system, if the SOC among the battery c...

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