Control method and control system for wind power participating frequency modulation of electric power system

Abstract

The invention provides a control method and a control system for wind power participating frequency modulation of an electric power system. The control method comprises regulating and controlling the frequency of the electric power system by using rotor kinetic energy and a storage battery energy storage system. According to the control method for wind power participating frequency modulation of the electric power system based on combined effect of the rotor kinetic energy and the storage battery energy storage system, the wind energy is sufficiently utilized, the configuration capacity of the energy storage system is reduced, and the economical efficiency of wind field operation is improved. The control method and the control system can also play better roles even under the condition of relatively great load disturbance.

Description

technical field [0001] The present invention relates to the technical field of wind power generation, and more specifically, to a control method and system for wind power participating in power system frequency modulation. Background technique [0002] As of the end of 2015, the new installed capacity of wind power in the world has reached 63.013GW, and the total installed capacity of wind power in the world has exceeded 430GW. The penetration rate of wind power in the power grid continues to increase, which brings new problems to the frequency regulation of the power system. Wind turbines controlled by inverters cannot participate in system frequency adjustment without additional control; wind turbines usually operate at the Maximum Power Point (MPP), cannot provide active power backup, and do not have the same frequency modulation capabilities as synchronous machines. The safe and stable operation of the system cannot be guaranteed. [0003] At present, scholars have cond...

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Problems solved by technology

The response speed of rotor kinetic energy control is fast, but it can only provide frequency support in the dynamic process, and the duration is short, so it cannot provide sufficient support for large load disturbances. The control can provide a frequency reserve, but it needs to change the pitch angle frequently, which will increase the wear of the mechanical part and reduce the service life of the fan; for the overspeed control, the overspeed control cannot be realized when the wind speed is high, and the derating operation and Economically contradictory

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