Wind-light power smoothing control method and system based on hybrid energy storage system

Abstract

The invention discloses a wind-light power smoothing control method and system based on a hybrid energy storage system. The method includes the steps of acquiring the wind-light output power at a current moment, wherein the wind-light output power includes wind power output power and photovoltaic output power; according to the wind-light output power at the current moment, using a weighted movingaverage algorithm to calculate high-frequency power of the wind-light output power at the current moment; using a super capacitor for stabilizing the high-frequency power; according to the wind-lightoutput power at the current moment, using a low-pass filtering algorithm to calculate low-frequency power of the wind-light output power at the current moment; using a battery for stabilizing the low-frequency power. The method fully utilizes the advantages of large energy density of the battery and large power density of the super capacitor, so that power fluctuations in different frequency ranges are stabilized, and fluctuations of wind-light power are reduced to meet the requirements of grid connection.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a wind power smooth control method and system based on a hybrid energy storage system. Background technique [0002] Wind and wind output power has strong randomness and volatility. Although wind and light output have a certain natural complementarity at multiple time scales, the combined output of the two can offset part of the medium-to-long-term and short-term power fluctuations, but in a In a short control period, its stability is still difficult to be guaranteed. Therefore, when the two are combined for output, it is necessary to cooperate with a reasonable control strategy of the energy storage system to make the combined output power of wind and storage meet the grid-connected requirements under its power smoothing mode. . Contents of the invention [0003] The purpose of the present invention is to provide a wind-solar power smoothing control method and system base...

AI Technical Summary

Problems solved by technology

[0002] Wind and wind output power has strong randomness and volatility. Although wind and light output have a certain natural complementarity at multiple time scales, the combined output of the two can offset part of the medium-to-long-term and short-term power fluctuations, but in a In a short control period, its stability is still difficult to be guaranteed. Therefore, when the two are combined for output, it is necessary to cooperate with a reasonable control strategy of the energy storage system to make the combined output power of wind and storage meet the grid-connected requirements under its power smoothing mode.

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