MODELING OF IGBT-CONVERTERS BY INTERCONNECTED SUBSYSTEMS WITH CONSIDERING OF SNUBBER CIRCUITS

To create high-speed computer models of plants with electric machines and semiconductor converters the methodology of system modeling by interconnected subsystems is utilized. The complex of models of different plants in the in-house develop environment ComSim was developed. Among others models of IGBT-converters were created. The models were built under certain assumptions and simplified representations of systems. In most cases snubber circuits used for limitation of overvoltages on transistors are not taken into account in the models of the IGBT-converters. In this paper a mathematical description of a three-phase voltage source inverter with considering of the snubber circuits and total switching time of transistors is presented. The computer model of plant with voltage source inverter was constructed. Calculation results that proved advisability of described clarifications of the inverter model are presented. The developed mathematical description of inverter is used for elaboration of models of active rectifier, AC-AC converter and other devices, included in created model complex.

Authors: A. S. Grigoryan, A. R. Mamutov, M. V. Pronin, A. G. Vorontsov

Direction: Electrical Engineering

Keywords: Voltage source inverter, transistor switching, overvoltages, snubber circuits, modeling

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