基于遗传算法的交直流电力系统稳定器和附加控制器的协调

Coordination between power system stabilizer and additional controller based on genetic algorithms

交直流混合电力系统低频振荡是运行中的一个严重问题。在交流系统中装设电力系统稳定器PSS(PowerSystemStabilizer),在直流系统中装设直流附加控制DCM(DirectCurrentModulation能够抑制低频振荡,但在多控制器的系统中,利用传统方法针对某一模式设计的控制器往往对其他振荡模式起负作用,所以控制器的参数协调是关键问题。利用参与因子选取控制器装设地点,引入遗传算法进行参数协调,通过选取适当的目标函数和适应度的值找出能够达到目标的一组最优参数。

Low-frequency oscillation is a serious problem in AC/DC power system. The use of power system stabilizer allocated in AC system and additional controller allocated in DC system may suppress the low-frequency oscillation,but in multi-controller system,controller designed for a certain oscillation pattern may have a bad effect on other patterns,so the parameter coordination becomes pivotal. The participation matrix is applied to determine the locations of controllers and GA(Genetic Algorithm) coordinate the parameters. By choosing proper target function and fitness func-tion,a set of optimum parameters can be found. The example shows that the controller with the parameters set by participation matrix and GA have a good effect on damping low-frequency oscillation.