A mixed liquid flow energy storage system with reactive power compensation function

An energy storage system and mixed liquid technology, applied in the field of energy storage systems, can solve problems such as poor start-up time, and achieve the effects of reducing cost-to-cycle ratio, eliminating frequency drift, and extending service life
CN103606942BActive Publication Date: 2015-09-23STATE GRID CORP OF CHINA +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
STATE GRID CORP OF CHINA
Publication Date
2015-09-23

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Abstract

The invention provides a mixed-liquid-flow energy-storage system with a reactive compensation function. The system includes a liquid-flow battery energy-storage system and a supercapacitor group, which are connected through a DC circuit breaker group. The supercapacitor group, a bidirectional DC / AC converter, a boosting transformer, an AC circuit breaker and an AC power grid are connected in order. The liquid-flow battery energy-storage system includes an all-vanadium liquid-flow battery, a sodium-sulfur battery and a zinc-bromine battery. The supercapacitor group is formed by serial or parallel connection of single-body supercapacitors. The single-body supercapacitors are double-electric-layer supercapacitors or electrochemical supercapacitors. Compared with the prior art, the mixed-liquid-flow energy-storage system with the reactive compensation function is capable of improving effectively stability and reliability of power supplying a distributed power generation system.
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Description

technical field

[0001] The invention relates to an energy storage system, in particular to a hybrid energy storage system based on a supercapacitor and a liquid flow battery. Background technique

[0002] With the increasing popularity of distributed new energy grid-connected power generation, distributed power generation capacity will account for an increasing proportion of the entire power system. However, various distributed power generation such as wind energy and solar energy is an intermittent energy source, which is seriously affected by climate and environment, and the output power is unstable and incompletely controllable. The investment of large-scale distributed grid-connected devices will have a non-negligible impact on the power quality, stability and safe operation of the power system. Therefore, when the distributed generation system is connected to the AC grid, it is necessary to configure a certain capacity energy storage device to ensure the continuity and...

Claims

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