Carrier-based discontinuous PWM modulation for current source converters

Abstract

Two generalized discontinuous carrier-based pulse-width modulation (GDPWM) methodologies for three-phase current source converters (CSC) are developed based on the classical space vector method and the carrier-based generalized discontinuous modulation scheme for voltage source converters (VSC). With feasible operation in both the linear and overmodulation regions, they provide the known advantages of the discontinuous carrier-based modulation in voltage source converters-reduced switching loss and reduced effective switching frequency especially in the overmodulation region. These modulation schemes are implemented for a current source inverter from which experimental results are presented to verify concepts and theory.