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选择电容电压作为脉冲触发同步信号 ,对 TCSC阻抗阶跃特性的电磁暂态过程进行了深入的研究。发现脉冲触发角阶跃变小 (大 )时 ,电容电压的周期时间也突然变小 (大 ) ,使得 TCSC的导通角不会随着触发角的阶跃变化而发生突变 ,而是经过一个振荡过程逐渐达到稳态值 ,进一步揭示了电容电压同步方式下阻抗阶跃特性会出现过冲和振荡现象的原因。最后提出了 2种能够改善TCSC阻抗阶跃特性的脉冲触发控制方式 ,并借助数字仿真予以验证。
The capacitor voltage is selected as the pulse-triggered synchronization signal, and the electromagnetic transient process of TCSC impedance step-by-step is studied in depth. It is found that when the pulse triggering step is small (large), the cycle time of the capacitor voltage also suddenly decreases (large) so that the conduction angle of the TCSC does not change suddenly with the step change of the firing angle, but after a The oscillation process gradually reaches the steady-state value, which further reveals the reason of overshoot and oscillation of the impedance step characteristics in the capacitor-voltage synchronous mode. Finally, two kinds of pulse-triggered control methods that can improve the TCSC impedance step-by-step characteristic are proposed and verified by digital simulation.