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Mixed-liquid-flow energy-storage system with reactive 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 the cost-to-cycle ratio, eliminating frequency drift, and reducing the number of cycles.

Active Publication Date: 2014-02-26
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This system can only be applied to an independent non-grid-connected system, and the lithium-ion battery has no problem of mechanical start-up time difference of the flow battery, nor can it provide reactive power compensation function for the AC grid

Method used

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  • Mixed-liquid-flow energy-storage system with reactive compensation function
  • Mixed-liquid-flow energy-storage system with reactive compensation function
  • Mixed-liquid-flow energy-storage system with reactive compensation function

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Embodiment Construction

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0031] The invention provides a mixed liquid flow energy storage system with reactive power compensation function, such as figure 1 The system shown includes a flow battery energy storage system, a DC circuit breaker bank, a supercapacitor bank, a bidirectional DC / AC converter, a step-up transformer, and an AC circuit breaker connected in sequence; the AC circuit breaker and the AC grid of the distributed generation system connected;

[0032] The flow battery energy storage system includes all-vanadium flow battery, sodium-sulfur battery and zinc-bromine battery; the supercapacitor bank is composed of single supercapacitors in series or in parallel; the single supercapacitors are electric double layer supercapacitors or electrochemical supercapacitors ; The bidirectional DC...

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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.

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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Application Information

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IPC IPC(8): H02J3/32H02J3/18
CPCY02E40/30
Inventor 曹远志周晨鄢盛驰陶以彬李官军刘欢胡金杭冯鑫振苏广宁张宇
Owner STATE GRID CORP OF CHINA
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