基于扩张状态观测器的电力系统混沌滑模控制

Sliding-mode control of power system chaos based on extended state observer

针对电力系统遭受较大周期性扰动时出现的混沌现象,提出了一种基于扩张状态观测器的滑模控制方法。设计扩张状态观测器观测系统的状态变量,通过定义扩张状态变量将外部扰动近似为1个已知量,简化滑模控制器的设计过程,实现系统的快速收敛。并采用Lyapunov稳定性理论证明了系统的稳定性。仿真结果表明:该控制方法能够有效地控制电力系统混沌振荡,并缩短受控系统的收敛时间。

A sliding-mode control scheme based on extended state observer was proposed for the chaos of power system when disturbed by a comparatively large periodic load disturbance. The extended state observer was applied to estimate the unknown states,the external disturbance was approximated to a known quantity by defining the expansion state variable,which can simplify the design of sliding-mode controller,and realize the fast convergence of the system. The stability of the system was proved by the Lyapunov theory. The simulation results showed that the proposed method could supress the chaos oscollation effectively by the Matlab confirmed,and shorten the convergence time of the controlled system.