基于反馈线性化的TCSC滑模控制

Sliding Mode Controller for TCSC Based on Feedback Linearization

针对含可控串联补偿(Thyristor Controlled Series Compensation,TCSC)的电力系统非线性强及易受外部扰动的特点,应用反馈线性化方法和滑模变结构控制理论,设计了提高系统稳定性的可控串联补偿滑模控制器。通过引入反馈控制变量,基于状态反馈线性化理论实现了对非线性模型的精确线性化。采用极点配置方法设计滑模切换函数,从理论上保证发电机转子方程具有期望的极点。为了减小抖振采用指数趋近律和准滑动模态方法求取滑模控制律,使得设计的可控串联补偿非线性控制律形式简洁,鲁棒性好。为了验证该控制策略的有效性,在Matlab/Simulink环境下建立了基于反馈线性化的可控串联补偿滑模控制系统仿真模型,进行了仿真研究。仿真结果表明,与传统的控制方式相比,设计的控制器能有效地阻尼系统振荡,增强系统的暂态稳定性。

To the strong nonlinearity and external disturbances of power system including thyristor controlled series compensation （ TC- SC）, a nonlinear sliding mode control strategy for TCSC is proposed, The controller for the nonlinear system is designed using feedback linearlzation and sliding mode control theory. The nonlinearity model realizes exact linearization using state feedback linearization method by the introduction of feedback control variable. With using polar assignment theory the sliding mode switch function is designed to make the generator rotor equation have expectable poles, With using exponential approaching law and quasi-sliding mode theory the control law is obtained to make the controller simple and robust. The simulation results show that the proposed controller can damp the oscillation and enhance the transient stability of the power system more effectively.