The optimization of snubbers for IGCT-based voltage source inverters

In recent years, IGCTs have been equipped widely in many voltage source inverters (VSI) for industry applications. The snubber optimal design is important part for IGCT-based VSI. Based on the reasonable modeling of IGCT switching-on and -off responses, the snubber size is optimized for minimum total energy losses with respect to the recovery efficiency of the regenerative snubber in this paper. Two constrained conditions, which are the limits of di/dt and dv/dt and the minimal on- and off-time, are considered in the analysis and optimization. The optimized results for the IGCT of 5SHX08F4502 are obtained.