Analysis of Stator Internal Phase-to-Phase Short-Circuit in the Multiphase Permanent Magnet Synchronous Generator with Rectifier Load System
Tian Daizong, Sun Yuguang, Wang Shanming, Du Wei
State Key Lab of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing 100084 China
Abstract：Combining the multi-loop method with the finite element method (FEM), this paper established a general mathematical model for the internal phase-to-phase short-circuit in the multiphase permanent magnet synchronous generator (PMSG) with rectifier load system. With this mathematical model, all the voltages and currents of stator windings are calculated under normal operation and internal short-circuit fault conditions. In addition, the model is applicable to both single-branch and multi-branch generators. The fault experiment was carried on a customized 6-phase dual-branch PMSG. The experimental results are consistent with the simulation results, which verifies the correctness of the mathematical model. Based on the accurate calculation of the winding current, the temperature field of the model machine before and after the fault was also calculated. The results show that the fault changes the distribution of the internal temperature field of the model machine. According to the simulation and experimental results, the characteristics of the phase-to-phase short-circuit fault were analyzed. Furthermore, the severe influence of the obvious temperature rise near the short-circuit position on the model machine was analyzed, and the potential hazard of over-current in some rectifier bridges caused by phase-to-phase short-circuit between different groups of three-windings was illustrated. This paper provides the basis for the detection of phase-to-phase short-circuit faults in multiphase PMSG.
田代宗, 孙宇光, 王善铭, 杜威. 多相整流永磁同步发电机绕组内部相间短路的故障分析[J]. 电工技术学报, 2020, 35(6): 1262-1271.
Tian Daizong, Sun Yuguang, Wang Shanming, Du Wei. Analysis of Stator Internal Phase-to-Phase Short-Circuit in the Multiphase Permanent Magnet Synchronous Generator with Rectifier Load System. Transactions of China Electrotechnical Society, 2020, 35(6): 1262-1271.
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