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针对电力系统控制器设计中,控制器阶数过高且影响控制品质的问题,提出一种基于射影定理的降阶控制器设计新方法,并对射影定理做出改进,实现抑制低频振荡的高压直流附加阻尼控制.通过总体最小二乘-旋转不变技术分析系统振荡特性并辨识出相关模型,再基于极点配置得到状态反馈矩阵,最后利用改进的射影控制理论设计输出反馈降阶控制器,同时将控制器与传统的带观测器的极点配置控制方法进行比较.仿真验证表明,基于射影控制理论的控制器效果较好,控制器阶数较低,鲁棒性强,便于工程实现.
Aiming at the problem that the order of controller is too high and the quality of control is affected in the design of power system controller, a new method for designing reduced-order controller based on projective theorem is proposed and the projective theorem is improved to realize high voltage DC additive damping control.The oscillation characteristics of the system are analyzed and the relevant models are identified by the least-squares-rotation invariant technique. Then the state feedback matrix is obtained based on the pole configuration. Finally, the output feedback controller is designed by using the improved projective control theory. The controller is compared with the conventional pole placement control method with observer.The simulation results show that the controller based on projective control theory is effective and the order of controller is low and the robustness is good.