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在假设可控串联补偿 (TCSC)两端电压中工频分量和次频分量能够解耦的条件下 ,推导出了当在 TCSC的基波电压上叠加一个微小的次同步频率分量电压的情况下 ,TCSC等效次频阻抗表达式。在此基础上 ,分析了 TCSC抑制次同步谐振的机理。分析表明 ,TCSC对次同步频率分量呈现正电阻特性 ,其抑制 SSR的机理在于电阻效应和电感效应等的综合作用。仿真结果证实了次频模型分析结果的正确性。
Under the assumption that the power frequency component and the sub-frequency component of the voltage across the TCSC can be decoupled, it is deduced that when a slight sub-synchronous frequency component voltage is superimposed on the fundamental voltage of the TCSC , TCSC equivalent frequency response. On this basis, the mechanism of TCSC suppressing subsynchronous resonance is analyzed. The analysis shows that the TCSC possesses the positive resistance characteristic to the sub-synchronous frequency components, and the mechanism of the inhibition of SSR lies in the combined effects of the resistance effect and the inductance effect. The simulation results confirm the correctness of the analysis result of the sub-frequency model.