传统电力系统稳定器大多采用本地信号作为反馈输入且多为多模块级联控制结构,自由度、鲁棒性均具有局限性.为了提高其抑制系统低频振荡的能力,提出了一种基于广域测量信息和射影定理的多通道电力系统稳定器设计方法.本文采用具有高精度的TLS-ESPRIT算法辨识系统模型,并根据辨识结果分别在全系统为不同的振荡模态选择可观性及可控性均较强的信号作为控制器的反馈输入.而后,通过带通滤波器分离系统模态,并基于射影定理对各个模态分别设计控制器,实现各个模态间的分层控制.同时设计固定时滞补偿环节,以消除广域信号时滞对于控制效果的影响.最后,再次设计了传统电力系统稳定器与之进行比较.仿真实验表明,所设计的控制器较传统电力系统稳定器有更好的控制效果,且控制器阶数较低,鲁棒性强,适于工程实践.%The degrees of freedom and robustness and the conventional power system stabilizer(PSS)are usually con?strained due to its feedback input of local signals and multi-module cascaded structure. To improve its ability to sup?press the low-frequency oscillation,a multi-channel PSS based on wide-area measurement signals and projective theo?rem is designed. The system model is identified by the high-accuracy TLS-ESPRIT algorithm. Based on the identifica?tion result,the wide area measurement signals with both higher observability and controllability are selected as the feed?back input of controllers in different oscillation modes. Then,band-pass filters are adopted to separate the oscillation modes,and controllers are designed for each mode based on projective theorem,thus realizing an hierarchical control for each mode. Moreover,compensation is designed to eliminate the influence of time delays in wide-area signals on the control effect. At last,a conventional PSS is designed and compared with the designed controller. Simulation tests indi?cate that compared with the conventional PSS,the designed controller has better control effect,lower order of the con?troller and stronger robustness,which is suitable for engineering practices.
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