基于抑制电力系统低频振荡的火电机组控制方式优化

Optimization on the Control Mode of Thermal Power Unit to Suppress Low Frequency Oscillation of Power System

电力系统低频振荡事件的发生有一定的随机性,目前火电机组热工控制方式不能有效抑制低频振荡。结合两个具体案例,分析火电机组参与低频振荡的过程,总结得到共同点;基于振荡期间汽轮机转速信号与电网频率信号的显著差异这一特点,提出了可抑制强迫振荡的火电机组控制方式优化方法,并建议使用电网频率信号代替转速信号用于一次调频回路。

Due to the randomness of its occurrence in power system,currently there is no effective way to suppress the low frequency oscillations through the existing thermal control modes of generation units.Based on the two specific study cases,this paper analyzes the process of thermal power units participating in low-frequency oscillation and then summarizes them in common.Arising from the observation of significant discrepancies between the turbine speed signal and the power grid frequency signal during the oscillation,an optimization method is proposed to suppress the forced oscillation by virtue of the control mode of thermal power unit.Additionally,it is suggested to replace the speed signal with the power grid frequency signal for the primary frequency modulation.