Damping Characteristic Research Of Complex Electric Power System

In the modern electric power system,additive damping controllers of FACT and PSS exist synchronously,but in the research of small disturbance stabilization,the damping characteristic studys of such system with multi-controllers are few and become a weak link in this field.So in this paper a linear model of power system is established which is composed of generators,AC-DC line,TCSC and three controllers :PSS,DCM and damping controller of TCSC .And this model is used to analysing and computing two examples(one-machine and four-machines).The research concludes the total damping characteristics of complex electric power system;And the distribution of damping added into system by one controller when the other two have been in the system;And the transfer law of damping when adjustable parameters of one controller is changed and the other two controllers'are fixed;And the law of three controllers affecting each other in the every condition.These conclusions could give some advices to coordination control of the complex electric power system.