A method of compressed air energy storage system responding to power grid frequency modulation

Abstract

The invention discloses a method for the compressed air energy storage system responding to the frequency modulation of the electric network. The method comprises the following steps: the compressor of the compressed air energy storage system is a direct current motor, which is controlled by a direct current frequency conversion device; the direct current frequency conversion device comprises a frequency modulation function module and a frequency conversion function module; the frequency modulation function module comprises a frequency difference unit, a dead zone unit and a difference adjustment unit; The frequency conversion function module comprises a correction unit and a limiting unit. A frequency signal f of a power network is converted into a frequency difference Deltaf by a frequency difference unit, The frequency difference is compared by the dead-zone unit, the frequency difference is greater than the dead-zone delta delta, and then the frequency difference is outputted, thepower adjustment amount Delta P of the compressor is calculated by the difference adjustment unit, the corrected power value P1 is obtained by the correction unit, and the control power P is finally outputted by the amplitude limiting unit, and the compressor is driven by the DC frequency conversion motor. The invention can utilize the bi-directional characteristic of compressed air energy storageto realize the response regulation of the load side to the frequency of the electric network, ensure the frequency stability of the electric network operation and improve the frequency qualificationrate.

Description

technical field [0001] The invention belongs to the technical field of power grid frequency regulation methods, and in particular relates to a method for a compressed air energy storage system to respond to power grid frequency regulation. Background technique [0002] With the increasing scale of new energy power generation, the problems of intermittency, volatility and even anti-regulation of its power generation are becoming more and more prominent. Effective technical solutions are urgently needed to solve the problem of large-scale grid connection of new energy. Large-scale electric energy storage technology is an effective way to solve this problem, and compressed air energy storage system is considered to be one of the most promising large-scale electric energy storage technologies. Small and other advantages. [0003] At present, there are some demonstration projects at home and abroad. my country mainly develops non-supplementary combustion compressed air energy st...

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Problems solved by technology

[0003] At present, there are some demonstration projects at home and abroad. my country mainly develops non-supplementary combustion compressed air energy storage. At present, it mainly studies the thermal system of compressed air energy storage itself, and has not conducted further research on participating in power grid peak-shaving and frequency-regulating operations, especially for compressors. Response to power grid frequency regulation has not been reported in domestic literature

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