基于广域测量信号和射影控制的多通道PSS设计

发布时间：2018-12-16 18:35

【摘要】：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。
[Abstract]:Traditional power system stabilizers mostly use local signals as feedback input and most of them are multi-module cascaded control structures. The degree of freedom and robustness are all limited. In order to improve its ability to suppress low frequency oscillation, a design method of multi-channel power system stabilizer based on wide-area measurement information and projective theorem is proposed. In this paper, the TLS-ESPRIT algorithm with high precision is used to identify the system model, and according to the identification results, the signals with strong observability and controllability are selected as the feedback input of the controller for different oscillation modes in the whole system. Then, the system modal is separated by bandpass filter, and controller is designed for each mode based on projective theorem to realize the hierarchical control of each modal. At the same time, the fixed time delay compensation link is designed to eliminate the influence of wide area signal delay on the control effect. Finally, the traditional power system stabilizer is designed and compared with it. The simulation results show that the designed controller has better control effect than the traditional power system stabilizer, and the controller has lower order, stronger robustness and is suitable for engineering practice.
【作者单位】：四川大学电气信息学院;秦皇岛市供电公司;
【分类号】：TM712

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