A battery energy storage system auxiliary primary frequency modulation optimization control method

Abstract

The present invention provides a battery energy storage system assisted primary frequency regulation optimization control method, characterized in that the method includes the following steps: obtaining the power deficit of the primary frequency regulation and the change rate of grid frequency deviation; obtaining the adjustment proportional coefficient of the battery energy storage system ; Calculate the output power value of the battery energy storage system; determine the timing and degree of correction of the state of charge of the battery, and perform correction. The method provided by the invention makes up for the shortcoming of insufficient power variation of the generator set, and is conducive to faster recovery of the grid frequency due to the fast response speed of the energy storage system. After the frequency regulation is over, under the premise that the grid frequency does not exceed the dead zone, the SOC of the battery is corrected to ensure the smooth progress of the next frequency regulation process, and the time-of-use electricity price is comprehensively considered to reduce the charging cost of energy storage and increase the reverse discharge income.

Description

technical field [0001] The invention relates to an optimal control method for primary frequency regulation of a power system, in particular to a primary frequency regulation optimal control method for a battery energy storage system that considers time-of-use electricity price correction SOC. Background technique [0002] The primary adjustment process of the power system frequency is: the speed of the governor of the unit varies with the frequency. If it exceeds the specified insensitive area, the governor will act. By changing the valve position of the prime mover, the power of the prime mover is adjusted. , to prevent the frequency from deviating from the standard. Due to its rapid adjustment, it is very important to the stable and safe operation of the power grid. But in actual operation, in order to reduce unit wear and maintain unit stability, many power plants set a large dead zone or exit the primary frequency regulation device to avoid primary frequency regulation....

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Problems solved by technology

In the prior art, how to control the output power of the battery energy storage system to achieve the role of auxiliary primary frequency regulation is still being explored. The invention patent document No. 201210348307.1 provides "an optimal control method for the battery energy storage system to participate in the primary frequency regulation of the power grid", but This method does not involve the coordination of battery energy storage and primary frequency regulation of traditional units, which requires large energy storage capacity and high cost; does not explore the proportional coefficient of battery energy storage system frequency regulation; and is performing SOC (state of charge, that is, battery State of charge) correction does not take charge cost and discharge benefit into account

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