基于暂态能量函数的电力系统非线性鲁棒滑模励磁控制

Nonlinear Robust Sliding Mode Excitation Control Based Transient Energy Function

针对电力系统暂态过程的非线性特性,以功角稳定为目标设计了一种状态反馈非线性滑动模励磁控制器。通过直接计算系统的暂态能量函数,利用Lyapunov稳定理论,得到稳定流形作为切换平面,然后设计相应的滑动模励磁控制律,将系统限制在所设计的稳定流形上。在设计时考虑了对系统参数不稳定性,从而控制律具有一定的鲁棒性。设计中未使用任何线性化方法,因而控制律对系统的非线性特性完全适应。仿真结果表明所设计的控制器不仅具有良好的小干扰稳定性,而且对于大干扰暂态过程也具有很好的抑制作用。

A novel nonlinear state feedback sliding mode excitation controller for power system is designed to enhance its angle transient stability. A steady manifold is derived by calculating the energy function of the system and utilizing the Lyapunov theory at first. Then a sliding mode excitation control law is designed to limit the system state on the steady manifold. The parameter uncertainty is considered during the design and the controller is robust to those parameters. The controller is effective in spite of the nonlinear characteristic of the power system because no linearization method is used. Simulation results show that the designed controller performance well on both small signal stability and large disturbance cases.