基于门级控制串联电容器不对称串补结构的次同步谐振抑制方法

Mitigating Subsynchronous Resonance With Asymmetric Series Compensation Structure Based on Gate-Controlled Series Capacitor

对门级控制串联电容器(gate-controlled seriescapacitor,GCSC)在抑制电力系统次同步谐振方面的应用进行了研究。介绍了GCSC的结构及基本控制原理,分析了GCSC稳态运行特性。对基于GCSC的各种不对称串补结构抑制次同步谐振的能力做了分析,采用复转距系数法求取电气阻尼来表示不对称串补结构缓解次同步谐振的效果。针对单相GCSC设计了次同步谐振阻尼控制器,并通过基于改进的IEEE次同步谐振第1标准测试系统的仿真,验证了所设计的GCSC不对称串补结构控制器不仅能够有效地抑制次同步谐振,且减少了投入的GCSC容量和工程费用。

A new FACTS device gate-controlled series capacitor （GCSC） is investigated to mitigate subsynchronous resonance （SSR）. The fundamental structure and basic control method of GCSC is firstly presented, and the steady state characteristics of GCSC are also analyzed. Then different asymmetric compensation structures based on GCSC are proposed, and the ability of mitigating SSR of various GCSC based asymmetric compensation structures is analyzed, for this purpose, the electrical damping is solved by complex torque coefficients method to show the effect of mitigating SSR by asymmetric compensation structure. A single phase GCSC SSR damping controller is designed, and by means of the simulation based on modified IEEE SSR first benchmark the designed SSR damping controller is verified. Simulation results show that the designed GCSC SSR damping controller can effectively mitigate SSR, and the rating of GCSC as well as the construction cost can be reduced.