Online Thevenin Equivalent Parameter Identification Method of Large Power Grids Using LU Factorization

作     者：Yun, Zhihao Cui, Xinhui Ma, Kaigang 

作者机构：Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Shandong Peoples R China 

出 版 物：《IEEE TRANSACTIONS ON POWER SYSTEMS》 (IEEE动力系统汇刊)

年 卷 期：2019年第34卷第6期

页      面：4464-4475页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：National Key R&D Program of China [2018YFB0904500  TPWRS-013352018] 

主　　题：Large power grid reactive power limitation Thevenin equivalent parameters wide-area measurement system 

摘      要：Real-time tracking and identification of Thevenin equivalent parameters is crucial for voltage stability online monitoring of large power grids. An online parameter identification method based on wide-area measurements and nodal analysis is proposed in this paper. The node-voltage equation is utilized directly, and the open-circuit voltage is calculated accurately as the Thevenin equivalent voltage of load buses. Moreover, the equivalent parameters can be identified precisely under the generator reactive power over-limit condition. To avoid repetitive Gaussian elimination of the high-dimensional linear system, lower upper factorization and optimized substitution are used to accelerate the open-circuit voltage solution process. The simulation results of multiple test systems demonstrate the accuracy and rapidity of the proposed method.