Research on grounding detection method for permanent magnet traction system in high-speed EMUs
To improve the accuracy of grounding fault diagnosis in the permanent magnet traction system of high-speed EMUs,this paper proposed a new grounding detection method suitable for permanent magnet traction systems.By combining the topology structure of the grounding detection circuit,the characteristics of grounding voltage under different grounding conditions were analyzed.Based on this analysis,measures such as optimizing the decision algorithm for grounding voltage exceeding limits,adopting step-by-step detection of each axis inverter,and adding diagnostic nodes for permanent magnet contactors were proposed.This method can accurately diagnose the specific grounding points on the motor side,transformer side and inverter side,thereby improving the accuracy of fault point localiza-tion.The feasibility of this method was verified by hardware-in-the-loop simulation and ground unit test results.
high-speed EMUstraction systemgrounding detectionhardware-in-the-loop simulationunit test
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