Fast balance control method and device of multiple battery stacks of energy storage power station

Abstract

The invention discloses a fast balance control method and device of multiple battery stacks of an energy storage power station. As the capacity of the energy storage power station becomes larger, thenumber of battery stacks contained in the energy storage power station is also increased synchronously; therefore, it is necessary to consider not only the balance of SoC between battery cells, but also the balance of the SoC between the battery stacks. The control method adopted by the invention is as follows: dividing states of charge of the battery stacks into several areas, and updating different states of charge and discharge depths in different areas; sequentially giving active power instructions of the battery stacks in proportions according to the updated states of charge and the discharge depths; and meanwhile, setting an updating threshold of the states of charge and the discharge depths to avoid the frequent switching of energy storage power. By adopting the fast balance control method and device disclosed by the invention, the balance speed of the states of charge of the multiple battery stacks of the energy storage power station can be effectively improved, the operationcondition of the energy storage power station is improved, and the available rate of the energy storage power station is improved; and meanwhile, the switching of the energy storage power is reduced as much as possible, and the operation stability of the energy storage power station and the friendliness with a power grid are improved.

Description

technical field

[0001] The invention belongs to the field of energy storage control, and relates to the control of an energy storage power station, in particular to a method and device for quickly balancing multiple battery stacks in an energy storage power station. Background technique

[0002] The large-scale access of renewable energy to the power grid brings huge challenges to the operation of the power grid. The power grid needs to configure a large number of flexible resources to hedge against the randomness of renewable energy. Usually, these flexible resources include frequency regulation and peak regulation capabilities of traditional generating units, pumped storage power plants, etc. Compared with conventional generator sets, the energy storage device using the power electronic converter as the grid interface has the ability to output full power in milliseconds, with fast response speed and high adjustment accuracy, which can effectively improve the flexibility of...

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