Power Loss and Thermal Impedance Modeling of Multilevel Power Converter With Discontinuous Modulation

The hard switching operation of the insulated gate bipolar transistor (IGBT)-based multilevel converters (MLCs) in transformer less direct integration renewable power plants produces a considerable amount and conduction loss. This eventually causes higher junction temperature lower thermal stability. symmetrically designed MLC using third harmonic sixty-degree bus-clamped pulse width modulation (BCPWM) technique demonstrates reduced losses better spectra. However, development analytical loss model is complex challenging issue due to discontinuous mode IGBTs for BCPWM MLC. In this regard, an calculating average rms currents antiparallel diodes (APDs) with proposed. Furthermore, calculate device turn-on turn-off losses, discrete form equation presented evaluate transition times more precisely. numerical values APDs found from derived equations are compared simulation experimental results. results agree well simulated outcomes, which validate proposed model. Moreover, advanced three dimensional impedance chip-wise interdependent multilayer coupling effect also considered paper realize critical loading condition devices.