Method and system for controlling battery energy storage power station for primary frequency modulation of power grid

Abstract

The invention relates to a method and a system for controlling a battery energy storage power station for primary frequency modulation of a power grid. The method comprises the steps of determining the frequency modulation requirement of the power grid according to the frequency deviation change rate of the power grid; determining the energy demand of the battery energy storage power station according to the battery charge information of the battery energy storage power station; and adjusting the frequency modulation power of the battery energy storage power station based on the power grid frequency modulation requirement and the energy demand of the battery energy storage power station. According to the method, the rapid response characteristic of the battery energy storage power stationis utilized, and fast response and rapid recovery are carried out on the frequency change of the power grid, so that the steady-state performance of primary frequency modulation is improved; and meanwhile, the battery energy state of the battery energy storage power station is optimized, so that the battery energy storage power station has the capability of primary frequency modulation for a longtime, and the transient performance of primary frequency modulation is improved.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a control method and system for a battery energy storage power station used for primary frequency regulation of a power grid. Background technique [0002] The frequency of the power system is an important control parameter for the operation of the power system. It reflects the balance between the active power of the power generation and the load, and is closely related to the safety and efficiency of the power equipment of the majority of users and the power generation and supply equipment itself. [0003] The primary frequency regulation of the power system is implemented by the speed regulation system of the prime mover. It responds quickly to system frequency changes and mainly undertakes those fast and small amplitude random load fluctuations. For load mutations under abnormal conditions, primary frequency regulation can play a certain role. A buffering effect, its existence can...

AI Technical Summary

Problems solved by technology

[0008] However, the cost of battery energy storage is high, and the configured energy is small. Under the condition of primary frequency regulation for a long time, the energy state of the energy storage will change. The ability of one-time frequency regulation will be weakened. At present, battery energy storage cannot meet the needs of one-time frequency regulation for a long time.

Images