DC-LINK CONTROL FOR A FIVE-LEVEL DIODE-CLAMPED INVERTER WITH REDUCED NUMBER OF COMPONENTS
Abstract
This paper presents a capacitor voltage balancing method for the five-level diode-clamped inverter using level-shifted pulse-width modulation (LS-PWM), including the voltage balancing of DC-link capacitors. The proposed system has a reduced number of components for mitigation of losses. The DC-Link capacitor voltage is regulated by adjusting the switching duty cycles of DC/DC converter. Simulation results are presented to verify the validity of this method.