以IEEE次同步谐振第1标准模型为研究对象,采用扫频和时域仿真相结合的复转矩系数法,从系统阻尼特性的角度分析了系统发生SSR的危险性,并用时域仿真法验证了该方法的正确性.在系统中加入TCSC,通过对电气阻尼特性的深入研究,发现在一定的条件下,TCSC使系统的电气谐振点发生了偏移,从而破坏系统发生SSR的条件;但是TCSC运行在较小导通角时,可能引起系统负阻尼频带加宽的现象,从而引起系统的次同步振荡,并通过时域仿真验证了该现象的危险性.讨论了TCSC的参数设计原则,使TCSC能够最大限度地提高对SSR的抑制能力.%The complex torque approach realized by frequency scanning and lime domain simulation was adopted to study the SSR dangerous of IEEE SSR first benchmark model, and time domain simulation was used to prove the correctness of this method. By changing a part of the fixed series capacitor to TCSC, the SSR damping characteristics with TCSC was studied. The results show that TCSC can mitigate SSR by migrating the system of electrical resonance points. But when the conducting angle of the thyristor is small TCSC can cause the phenomenon of widening negative electrical damping band, which may cause the SSO of power system. Time domain simulation was used to prove the dangerous of this phenomenon. Finally, the parameter design rule of the main circuit of TCSC was discussed based on the paper of the work, which can greatly improve the SSR mitigating ability of TCSC.
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