Self balancing of DC link capacitor voltages using redundant vectors for SVPWM controlled five-level inverter

Abstract

In this paper, space vector pulse width modulation algorithm for five level diode clamping inverter, with self stabilisation of dc link capacitor voltages is presented. On the base of position of reference voltage vector in space vector diagram, we explain how to choose switching states that will be used to generate the output voltages. The redundancies of some switching states are thoughtfully used to cancel imbalance of dc link capacitor voltages, on the base of a closed loop that use measurements of output and input currents of the inverter.