TCSC在抑制多机电力系统次同步振荡中的应用研究

摘要

The two machines system model, which is in the same power plant or in the different power plants, was established on PSCAD/EMTDC platform. Combined with the test signal method and Prony algorithm, this paper analyzed the possibility of system sub-synchronous os-cillation and the effect of thyristor controlled series compensation (TCSC) inhibiting sub-synchronous oscillation of homotype and different type two machines system. Simulation result shows that in adoption of new bench mark capacity, the electrical damping of the same model of two machines equivalent system is about two times of the single machine system;in issue of TCSC inhibition of two machine different model system SSR, there was a need to design additional sub-synchronous damping controller for different generators, and there was no obvious torsional in-teraction between two machines shaft system in different electric power plants.%在PSCAD/EMTDC平台构建同电厂和不同电厂两机系统模型，结合测试信号法和Prony算法，分析了系统发生次同步谐振的可能性及可控串联补偿（TCSC）抑制同型和不同型两机系统次同步振荡的效果。仿真结果表明，采取新的基准容量下，同型两机等值系统的电气阻尼为原单机时候的两倍左右；TCSC在抑制两机不同型系统同步谐振(SSR)问题时，需要分别为不同发电机设计附加次同步阻尼控制器，且位于不同电厂的两机轴系之间不存在明显的扭振相互作用。