Method for acquiring optimal charging and discharging power of energy storage system of wind power plant

Abstract

The invention relates to a method for acquiring the optimal charging and discharging power of an energy storage system of a wind power plant. The method comprises the following steps of: determining basic configuration of the energy storage system based on historical wind power and load data and an annual wind power and load prediction curve; based on a daily wind power load prediction curve, a real-time wind speed, the real-time SOC of the energy storage system and a wind power on-grid time-of-use electricity price, determining the charging and discharging state and the charging and discharging coefficient of the energy storage system; acquiring the charging and discharging power of the energy storage system; calculating the annual net yield of the energy storage system on the basis of the electric benefits, the environmental benefits, the peak regulation benefits, the equipment investment cost and the equivalent charging and discharging cost of the energy storage system; and calculating a wind curtailment consumption rate on the basis of the effect of the energy storage system for consuming the wind curtailment power of a wind power plant group, and determining the optimal charging and discharging power of the energy storage system according to the annual net yield and the wind curtailment consumption rate of the energy storage system. The peak regulation cost of the system can be reduced, generation of wind curtailment is reduced, the utilization level of wind energy can be effectively improved, and therefore, the annual net yield of the energy storage system is improved.

Description

technical field [0001] The invention relates to the technical field of wind farm energy storage system management, in particular to a method for obtaining optimal charging and discharging power of a wind farm energy storage system. Background technique [0002] As of the end of 2020, my country's cumulative installed wind power capacity reached 2.81×108kW, and wind power generation reached 4.665×1011kW·h, an increase of about 15% year-on-year. At present, my country has planned a total of 10 million-kilowatt-level wind power bases, which are concentrated in the northeast, north China, northwest and the end of the Inner Mongolia power grid, resulting in insufficient wind power consumption capacity of the power grid in this region. In order to alleviate the above contradictions, the battery energy storage system has the advantages of fast response, small size, and convenient installation and use to dynamically absorb and timely release wind power, effectively smoothing the inh...

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Problems solved by technology

However, the current battery energy storage system is expensive, which limits its large-scale application

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