利用TCR抑制发电机次同步谐振的仿真研究

为研究用晶闸管控制的电抗器(TCR)抑制次同步谐振(SSR)的原理及其控制,采用电气阻尼分析及时域仿真验证相结合的方法分析了TCR抑制SSR的基本原理,并在此基础上提出了TCR相应的控制器结构—比例型控制器。采用时域仿真实现的复转矩系数法—测试信号法,以IEEE次同步谐振第一测试系统为例,建立了SVC的真实时域仿真模型及比例型控制器模型,分析了在比例型控制器的控制下,TCR对发电机组次同步谐振阻尼特性的影响,同时考虑了TCR容量的变化对机组阻尼转矩系数的影响。最后通过时域仿真对所得结果进行的验证表明,采用比例型控制器的TCR可以大大提高谐振点附近电气阻尼,从而有效地缓解SSR。

Thyristor-controlled Reactor Used for Damping Subsynchronous Resonance

By means of electrical damping analysis and the time domain simulation validations,Thyristor-controlled reactor(TCR)for damping subsynchronous resonance(SSR)is studied in detail.The control theory of TCR for damping SSR is analyzed,and a proportional controller is designed to control TCR and to mitigate SSR according to the control theory.The complex torque coefficient method realized by time domain simulation,ie,the signal-test method,is used to study SSR damping characteristics with TCR.The first IEEE SSR benchmark model is adopted and the simulation models for TCR and the proportional controller are established.Meanwhile,the influence of the size of TCR on the electrical damping is also studied.Moreover,simulations are realized by PSCAD/EMTDC in time domain in order to validate the effectiveness of TCR.The results show that the electrical damping around the resonant point can be greatly increased by TCR with a proportional controller,indicating that the TCR with a proportional controller can mitigate the SSR effectively.