A Novel On-line Identification for Thevenin Equivalent Parameters of Power System Regarding Persistent Disturbance Condition
This paper presents a novel on-line parameter identification method of Thevenin equivalent circuit that is applicable to the situation when the persistent disturbances occur at the system side. Based on the theoretical derivation that the voltage and current variation at a node are taken as the superposition of the variations respectively caused by the system side and the load side, a new mathematical model that takes into account the variable at the system side is built. Independence of variables at the system side and the load side is used to solve the model. Compared with the existing methods, the proposed method doesnt assume that the equivalent source voltage is constant, so it is more applicable to the situation when persistent disturbances occur at the system side. Simulation and filed tests show that the proposed approach performs better than the least square method when the persistent disturbances occur at the system side. With the persistent disturbances becoming larger, the least square method doesnt work gradually, while the proposed approach can identify the parameters of the Thevenin equivalent circuit as well.
Least square method parameter identification persistent disturbances thevenin equivalent circuit
Youbo Liu Zhuoyi Li Yue Yang Junyong Liu
the School of Electrical Engineering and Information,Sichuan University Wanzhou Power Supply Company,Chongqing Electric Power Corporation
国际会议
西安
英文
1-8
2016-09-01（万方平台首次上网日期，不代表论文的发表时间）