TCSC与FSC抑制次同步谐振容量配比选择

Capacity Ratio Selecting for TCSC and FSC to Inhibit Sub-synchronous Resonance

基于IEEE次同步谐振第1标准测试系统,利用时域仿真实现的复转矩系数法——测试信号法,测试所研究系统的电气阻尼。在PSCAD/EMTDC中搭建晶闸管控制串联电容器TCSC(thyristor controlled series capacitor)模型,从系统电气阻尼特性角度来分析系统发生次同步谐振SSR(sub-synchronous resonance)的可能性。探讨固定串补单位容量成本函数,根据成本费用公式研究可控串补与固定串补容量的最优配比,仿真结果表明:在可控串补与固定串补FSC(fixed series capacitor)容量比为1∶10的情况下,系统在大扰动下仍然能够保持稳定,只是恢复到稳态时间相对变长,但却节省更多投资,更加经济。

On the basis of 1st standard IEEE subsynchronous resonance test system, via the complex torque coefficient test signal method achieved by time-domain simulation, the electrical damping of the study system has been cal- culated. The thyristor controlled series capacitor （TCSC） model has been set up in PSCAD / EMTDC, and the possi- bility of sub-synchronous resonance （SSR） has been analyzed according to system＇s electrical damping characteristics. The cost function of fixed series capacitor （FSC） has been discussed, then the optimal capacity ratio of the controlled series compensation and fixed series compensation can be obtained via cost function. Simulated results indicates that： when the capacity ratio of TCSC and FSC is 1 ： 10, the system is still able to maintain stability after large perturbation. Although the system takes more time to converge on steady status, the investment can be curtailed and the system is more economically viable.