Driver Integrated Fault-Tolerant Reconfiguration after Short-On Failures of a SiC MOSFET ANPC inverter phase

Conference: PCIM Europe 2018 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
06/05/2018 - 06/07/2018 at Nürnberg, Deutschland

Proceedings: PCIM Europe 2018

Pages: 8Language: englishTyp: PDF

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Gleissner, Michael; Bertelshofer, Teresa; Bakran, Mark-M. (University of Bayreuth, Department of Mechatronics, Centre of Energy Technology, Germany)

Fault-tolerant converters are required for applications with a high risk of damage or financial loss, like electric aircraft or energy transmission systems. The Active Neutral Point Clamped (ANPC) inverter is a fault-tolerant multilevel topology, which enables an ongoing degraded operation after single semiconductor failures, if no secondary failures caused by over-voltage and short-circuit currents occur. This paper investigates the critical failure scenarios of a three-level ANPC inverter prototype built with 650 V SiC MOSFETs. Innovative driver integrated measures for immediate short-circuit detection, over-voltage clamping and switching strategy reconfiguration in order to enable a reliable ongoing operation are presented. Thus, a very efficient and fault-tolerant inverter for applications with high availability requirements can be realized.