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An improved strategy to detect the switching device fault in NPC inverter system

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4 Author(s)
Jung-Dae Lee ; Hanyang University, Dept. of Electrical Engineering, 17 Haengdang-dong Seongdong-gu, Seoul, 133-791, Korea ; Tae-Jin Kim ; Jae-Chul Lee ; Dong-Seok Hyun

In this paper, a simple fault detection scheme is proposed for improving the reliability under the open-switch fault of a three-level neutral point clamped (NPC) inverter. The fault of switching device is detected by checking the change of a pole-voltage in a NPC inverter. This method has the advantages of fast detection ability and a simple realization for fault detection, compared with existing methods. Reconfiguration is also performed by two-phase control method that used to supply the balancing three-phase power to the load continuously. This proposed method minimizes a bad influence on the load caused by fault occurrence. This method can also be embedded into the existing NPC inverter system as a subroutine without excessive computational effort. The proposed scheme has been verified by simulation and experimental results.

Published in:

2007 7th Internatonal Conference on Power Electronics

Date of Conference:

22-26 Oct. 2007