SSSC非线性控制的直接反馈线性化方法

DIRECT FEEDBACK LINEARIZATION METHOD FOR DESIGNING SSSC NONLINEAR CONTROL LAW

考虑了静止同步串联补偿器(SSSC)的逆变器输出交流侧电压幅值和相位的动态调节过程及其直流侧电容电压的动态变化过程,建立了SSSC的三阶动态模型,并用直接反馈线性化方法设计了 SSSC与发电机励磁的协调非线性控制器,由于采用了动态反馈补偿 ,因而所设计的控制器对系统运行方式的变化具有很强的鲁棒性。该文还利用MATLAB的动态仿真环境Simulink及其 S_Function编程技术建立了相应控制系统的仿真模型,并基于该模型对系统的暂态行为以及输电线路有功功率的调节过程进行了仿真。仿真结果表明,所设计的控制器能有效地对线路有功功率进行控制,并能显著地改善电力系统的暂态稳定性。

The three-order dynamic model of the Static Synchronous Series Compensator (SSSC) is set up, in which the dynamic regulating process of the voltage magnitude and angle in the ac side of the inverter in the SSSC and the dynamic changing character of the capacitance voltage in the dc side of the SSSC are considered. The nonlinear controller of the SSSC collaborated with the excitation system of generators is designed according to the direct feedback linearization(DFL) theory. The controller has stronger robustness because of using the dynamic feedback compensation strategy. The simulation model of the controller is built based on the MATLAB SINMULINK and the programming technique of its S-Function,the transient process of simple systems with the SSSC and the dynamic regulating process of line active power are simulated. The digital simulation verifiesd that the controller can effectively control the line active power and obviously enhance the system transient stability.