Research on IGBT Voltage Drop Detection Method Based on Urban Rail PHM System

With the development of intelligent industrial equipment, online fault detection technology has become the direction of industrial development in the new era. In this context, the power devices for the subway also hope to be able to predict the failure without stopping the machine. The paper proposes a method for measuring the voltage drop of an IGBT tube based on a switching signal and a voltage signal of a plurality of measuring points. The method is based on a city rail traction transmission system, capable of real-time inference and detection and does not require the installation of redundant sensors. The obtained detection value can be used for the system input of the urban rail PHM system, can find its short circuit fault in time, is used as a feature parameter for judging the aging degree of each tube of the IGBT and can thereby perform the health condition detection of the whole device.