Control method and system of thermoelectric hybrid energy storage system

Abstract

The invention discloses a control method and system for a thermoelectric hybrid energy storage system. The method comprises the following steps: controlling a gas storage tank to supply gas to an expansion machine and controlling a high-heat energy storage tank to supply heat to the expansion machine in a power utilization peak period, and enabling the electric energy generated by the expansion machine to be supplied to a power market; and when the high heat energy storage tank has residual high heat, converting the high heat energy into low heat energy through a heat exchanger and storing the low heat energy in a low heat energy storage tank, wherein the low heat energy is supplied to the heat market. According to the control method of the thermoelectric hybrid energy storage system, on the basis of an A-CAES system, high heat is converted into low heat for storage, so the loss of heat energy storage is reduced, the defect that an existing energy storage system is single in energy storage function is overcome, and the cyclic utilization rate of energy is increased.

Description

technical field [0001] The invention relates to the technical field of electric energy storage systems, in particular to a control method and system for a thermoelectric hybrid energy storage system. Background technique [0002] A traditional compressed air energy storage system (CAES system) is mainly composed of a compressor, an air storage chamber, a combustion chamber, and an expander. When the system stores energy, the compressor drives the compressed air through electric energy and stores it in the air storage chamber; when the energy is released, the high-pressure air enters the combustion chamber from the air storage chamber, and the high-temperature and high-pressure air after combustion and heating drives the expander to drive the generator to do work. generate electricity. However, since this method mainly relies on burning fossil fuels to produce heat, a large amount of pollutants will be produced during combustion, which has the disadvantages of low energy cyc...

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Problems solved by technology

[0004] The object of the present invention is to provide a control method and system for a thermoelectric hybrid energy storage system. The method is based on an adiabatic compressed air energy storage system, through Convert high heat to low heat storage, thereby reducing the loss of thermal energy storage, and solving the problems of single structure, large heat loss and low recycling rate of high temperature energy storage in the prior art

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