TCSC的次频阻抗特性

SUB-SYNCHRONOUS FREQUENCY IMPEDANCE CHARACTERISTIC OF TCSC

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。

Assuming that the fundamental frequency component and the sub-synchronous frequency component of the voltage across TCSC can be decoupled, the equivalent sub-synchronous frequency impedance of TCSC is formulated under the circumstance that a tiny sub-synchronous frequency component adds to the fundamental voltage. On this basis, the mechanism of damping sub-synchronous resonance (SSR) by TCSC is analyzed. It is concluded that TCSC appears the positive resistance characteristics under the sub-synchronous frequency, and the mechanism of damping SSR by TCSC lies in the comprehensive function of its resistance effects and reactance effects. At last, the simulation results are given to verify the correctness of the analytical results. This project is the sub-project of China National Scaling Project-B (No. PD9521907-03).