Minimization and redistribution of switching losses using predictive PWM strategy in a voltage source inverter

Abstract

This paper considers a PWM strategy with minimization of switching losses and their redistribution between the modules of the power converter. The strategy combines method of switching losses minimization by choosing the most efficient discontinuous PWM pattern and an active thermal control of the hottest IGBT module in the system. The algorithm predicts the total losses in the system for different PWM patterns and losses in the hottest IGBT module. The cost function takes into account both values. The provided simulation results display the decrease of maximum temperature in the system, while the total losses slightly increase.