Auxiliary primary frequency modulation and optimization control method for battery energy storage systems

Abstract

The invention provides an auxiliary primary frequency modulation and optimization control method for battery energy storage systems. The auxiliary primary frequency modulation and optimization control method is characterized by comprising the following steps: obtaining the power shortage and the power grid frequency deviation change rate of primary frequency modulation; obtaining the modulation proportional coefficient of the battery energy storage system; computing the output power value of the battery energy storage system, determining the amendment opportunity and the amendment degree of the battery in a charging state, and amending. According to the method provided by the invention, the deficiency that a generator unit is insufficient in power change is made up; and the energy storage system is rapid in response speed, thus facilitating the faster recovery of power grid frequency. After the frequency modulation is completed, on the premise that the power grid frequency is not caused to cross a dead zone, SOC of the battery is corrected, next smooth frequency modulation process is ensured, the situation of time-of-use electricity price is comprehensively considered, charging cost for energy storage is reduced, and back discharge proceeds are increased.

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....

AI Technical Summary

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

Images