1. School of Electrical Engineering Wuhan University Wuhan 430072 China; 2. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China; 3. State Grid Chongqing Yongchuan Power Supply Company Chongqing 402160 China
Abstract：Time-delay estimation is the key to locate partial discharge (PD) source accurately with the time difference of arrival (TDOA) method. However, the time-delay error inevitably exists during measuring time difference, which leads to large location error because of low time delay accuracy. In order to reduce the dependency of the TDOA method on time delay accuracy, a novel PD source location approach based on successive approximation of multi-samples is proposed in this paper. The particle swarm optimization is employed to recurrently perform the optimization objective function. In this optimization objective function, the single sample value is obtained by the traditional TDOA method, while sensor array in turn determines the optimal location of the PD source. Experimental results show that the proposed method can effectively solve the problem of low location accuracy for the PD source caused by the poor accuracy of time delay measurements. The positioning result of the proposed method is potentially better than that of the traditional TDOA method, which verifies the proposed method.
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2016, Vol. 31 
