多机电力系统非线性大干扰抑制控制器设计

Nonlinear Large Disturbance Rejection Controller Design for Multi-machine Power Systems

针对具有励磁控制的多机电力系统,为避免以往由简单估计干扰上界或不等式放缩带来的保守性,将backstepping与minimax方法相结合提出了一种非线性大干扰抑制控制方法.考虑系统受到发电机发生机械功率扰动等突发性大干扰,设计了非线性大干扰抑制控制器,确保多机系统具有良好的鲁棒性和对大干扰的不敏感性.以两机系统为例进行仿真实验,结果表明这种控制方案可有效改善多机电力系统的暂态稳定性.

The excitation control problem in multi-machine power systems was discussed. In order to avoid the conservatism which comes from estimating the upper bound of the disturbance or magnifying the equation simply, a control method of nonlinear large disturbance rejection was proposed by using backstepping method combined with minimax method. Considering that the system may get large disturbance suddenly from the generator which has occurred mechanical power disturbance, a controller of nonlinear large disturbance rejection was designed. It was indicated that the multi-machine power system had good robustness and insensitivity about large- disturbance. Simulation results showed that the proposed control program can effectively improve the transient stability of multi-machine power systems.