Analytical Loss Equations for Three Level Active Neutral Point Clamped Converters

Abstract

This paper presents the analytical expressions that can be used to calculate conduction and switching losses in each devices of an Active Neutral Point Clamped Converter. These expressions can be used to determine the losses in the individual components at different load current, power factor and modulation index to map the critical operation points while dimensioning the devices. The operation at nominal frequency and at dc current have been analyzed as the machine draws zero frequency current at startup. The validity of the expressions have been substantiated by simulation results and numerical calculation of the losses using datasheet parameters.