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| Reliability-Oriented Control Strategy of Traction Converters in Urban Rail Transit Trains |
| Lin Shuai, Fang Xiaochun, Li Bailing, Lin Fei, Yang Zhongping |
| School of Electrical Engineering Beijing Jiaotong University Beijing 100044 China |
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Abstract Traction converters are the key subsystem of urban rail transit trains, whose reliability has received extensive attention. According to an industry-based survey, IGBTs are the most fragile components in power electronic converters. The working condition of IGBT modules is subject to the output power of traction motors. The changes in the operations of the traction inverters could cause fluctuations in junction temperature of IGBTs, thereby causing damage to IGBTs. Consequently, the research on IGBT reliability technology is conducted in this paper, not only for the reliability improvement, but also for the cost reduction. Firstly, mission-profile-based lifetime prediction of IGBT modules in urban rail transit train traction converters is carried out. Then, the effect of control approach for traction converters on IGBT lifetime is analyzed. Last, the reliability-oriented traction converter control strategy is studied, which will improve the reliability and availability of traction converter.
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Received: 08 July 2020
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2021, Vol. 36 
