During the operation of São Paulo Metro Line 13 train in Brazil,the problems of grid voltage overvoltage and intermediate DC voltage overvoltage of traction inverter often occur.In this paper,the overvoltage phenomenon is investigated and located,and the cause of the overvoltage problem is obtained.The corresponding transformation scheme and optimization suggestions are put forward.Through the test and actual operation verification,the transformation scheme is effective,and the train operation after the transformation is in good condition.There is no overvoltage problem again.However,the transformation scheme is time-consuming and laborious,so the design of the traction inverter should be optimized and improved in the future.
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