基于线性化模型的电力系统强迫功率振荡分析

电力系统强迫功率振荡为持续的周期性小扰动所引起低频振荡现象。基于电力系统的线性化模型,从频域分析的角度阐述了强迫振荡的机理、主要影响因素和工程分析方法,得出如下结论:当扰动频率接近系统固有的振荡频率时,可能激发系统的强迫功率振荡;固有振荡模式的阻尼比越小,强迫功率振荡幅值越大;对系统固有振荡模式参与程度较高的机组上施加扰动,同时输出响应对此模式的可观性亦较好时,强迫功率振荡幅值取得极大值。

Analysis on Power System Forced Power Oscillation Originated in Linear Model

Power System forced power oscillation is a kind of low frequency oscillation caused by persistent periodic small disturbance.This paper analyzes Frequency Domain originated in linear model.The mechanism,main factors related to it and engineering-oriented analysis method are expounded.The conclusion of this paper is that the resonance could be induced when the frequency of the persistent periodic small disturbance is close to an inherent oscillation frequency.The weaker the damping of the inherent oscillation mode is,the larger the amplitude of the resonance is.The amplitude of the resonance is maximal when the unit with large participation factor to the inherent oscillation mode is disturbed and the mode could well be observed in the formation of the outputs.