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中文摘要：
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。
英文摘要：
A new reduced-order controller design method based on improved projective control is introduced. And the low-frequency oscillations can be suppressed by high voltage direct current additional controller through this method. The system reduced mode and relative oscillation frequencies are obtained through TLS-ESPRIT algorithm. Then the controller is designed by improved projective control, after the pole-placement method is applied to obtain a state-feedback matrix. The traditional pole-placement controller based on observer is compared with the projective controller at the same time. The advantages of lower order, stronger robustness and better control effect have been proved through simulation.
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