Partial Discharge Location of Converter Station Based on Time Difference of Arrival

With electrical equipment insulation in converter station becoming more and more prominent, monitoring the insulation condition of electrical equipment at any time has become an inevitable trend. Since partial discharge (PD) signals contain rich insulation condition information, PD location is conducive to identify hitches of high-voltage electric equipment, which is a guidance for developing pertinent maintenance plan. In this paper, ultra-high frequency (UHF) antenna array with five UHF antennas is utilized to achieve PD source positioning based on time difference of arrival (TDOA). Aiming at sensibility to measurement error and poor convergence of TDOA-based method, Chan-Taylor (CT) method is proposed based on Chan's estimation as initialization. To alleviate the influence of measurement error on positioning results, weighted centroid CT (WCCT) is proposed by introducing a weighted factor based on distance difference. Simulation results illustrates that the performance of WCCT outperforms CT. Compared with the array with four UHF antennas, the increase of redundant information can effectively ameliorate the positioning accuracy.