Battery state-of-charge balance control system of medium-voltage direct-hanging type energy storage system

Abstract

The invention provides a battery state-of-charge balance control system of a medium-voltage direct-hanging type energy storage system. The control system comprises a battery management unit, a voltageacquisition unit, a current acquisition unit, a battery state-of-charge acquisition unit, an in-phase control unit, an inter-phase control unit, a driving unit and an energy storage inverter, and thecontrol system performs analysis and calculation according to the acquired battery signals and performs in-phase and inter-phase control on the energy storage system, so that the energy storage inverter completes electric energy conversion, and balance control on the state of charge of the battery of the energy storage system is realized. According to the invention, the battery state-of-charge balance control of the energy storage system can be finished and the working quality and the service life of a battery of the energy storage system is ensured.

Description

technical field [0001] The invention belongs to the technical field of electric power control, and in particular relates to a battery state-of-charge balance control system of a medium-voltage direct-mounted energy storage system. Background technique [0002] With the development of smart grid, energy storage technology has become an important link in its development process. The energy storage system can effectively solve the intermittent and fluctuating problems of solar power generation, wind power generation and other renewable energy generation, thereby improving the capacity of new energy generation in the power grid. Among various energy storage technologies, battery energy storage systems are given priority for development due to their advantages such as high power density, fast response speed, small footprint, and no special requirements for installation locations. [0003] The balance control of the state of charge of the battery energy storage system is an impor...

AI Technical Summary

Problems solved by technology

[0003] The balance control of the state of charge of the battery energy storage system is an important guarantee to ensure the service life of the battery and improve the utilization of battery capacity. If the SOC imbalance cannot be improved in time, it will eventually affect the output performance of the energy storage device and the service life of the battery.

In addition, with the continuous cycle operation of the energy storage device, the inconsistency of the aging degree of the battery packs in each phase will gradually increase the inconsistency of the SOC between the phases.

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