Research on the Degradation Characteristics of IGBT Safe Operation Area(SOA) in Traction Converter

IGBT is the core part in traction converter, its performance directly affects the design characteristics of the converter. Ensure IGBT works in its own safe operation area(SOA) can improve the reliability of traction converter, decrease failure rate and extend service life. Based on the aging mechanism of traction converter IGBT, this paper studies on the degradation of boundary characteristic parameter of IGBT safe operation area(SOA), which include maximum collector continuous current $I_{CDC}$ , maximum collector power consumption $P_{Cmax}$ and short-circuit saturated current $I_{SC, sat}$ , buliding the dynamic models of DC safe operation area (DCSOA) and short circuit safe operation area (SCSOA) in IGBT life cycle. this model has certain theoretical significance and application value for IGBT condition monitoring.