Flow battery energy storage system and system with intermittent energy

Abstract

The invention provides a flow battery energy storage system. The flow battery energy storage system comprises an energy storage management system and m parallel flow battery energy storage units, wherein m is a positive integer greater than or equal to 2; and the energy storage management system is used for power equalization and SOC equalized charging between the flow battery energy storage units. The invention further provides a power supply system with intermittent energy and a flow battery energy storage management method. According to the flow battery energy storage system, the system with the intermittent energy and the flow battery energy storage management method provided by the invention, the parallel flow battery energy storage units can be independent of each other, thus the cost is reduced and modularization is easy to be realized; the SOC equalized charging is realized by a liquid flow energy storage management system and a power conversion device; one power conversion device is set for each flow battery device to carry out closed-loop control, so as to realize accurate adjustment of flow equalization and power equalization, rapid response and high efficiency; and a power conversion branch performs voltage balancing control on an electric pile branch, the power conversion branch is decoupled from other control objectives, and the control is simple and effective.

Description

technical field [0001] The invention relates to the field of integration of liquid flow battery energy storage systems, in particular to a liquid flow battery energy storage system and a system with intermittent energy sources. Background technique [0002] With the large-scale access of intermittent new energy sources such as wind power and photovoltaics, the power system is facing increasing pressure on frequency regulation and peak regulation, and related problems such as system stability and power supply quality have gradually emerged. Energy storage technology is the solution effective means for this series of problems. [0003] The all-vanadium redox flow battery is the largest, most technologically advanced, and closest to industrialized flow battery in the world today. The active material of the vanadium redox flow battery does not exist inside the battery, but is stored in a tank outside the battery. The output power and energy storage capacity can be independently...

AI Technical Summary

Problems solved by technology

[0017] This patent applies for an integrated design scheme for medium and large-scale flow battery energy storage systems with flexible capacity configuration, rapid power switching response, and real-time controllable balanced charging. Issues such as SOC equalization charge put forward corresponding control operation strategies

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