A New PWM technique for Voltage balancing in High power Cascaded Converters

Abstract

For single-phase supplies adedicated pulse width modulation (PWM) methoddesigned for cascaded H-bridge converters isoffered to scale down the DC-link voltageunbalance independently from the amplitude of theDC-link voltage reference and compensatesswitching devices voltage drops and on-stateresistances with that an expand in waveformgreat can be done most often, relevant in excessivepower low frequency operations. Eliminatesfurther control loop for DC-hyperlink voltagebalancing capacity to actively stability the DC-linkvoltage on each and every H-bridge which simplifies themanipulate constitution. The proposed modulationprocedure has been validated by means of the use ofsimulation based on fuzzy logic controller.