Harmonic Analysis and Design of LC Filter for a Seven-level Asymmetric Cascaded Half Bridge Multilevel Inverter

Abstract

As a lot of multilevel inverter designs are being introduced in order to generate an output voltage that resembles a pure sinusoidal waveform, a need is felt for balancing the number of output voltage levels with the amount of static switches required for a sustainable development. Many optimal topologies have been suggested, as of now, that seem to have resulted in the reduction of number of switches required to generate a certain number of level in the output. Carrying the same ideology forward, this paper illustrates a half-bridge inverter being operated on two PWM switching strategies followed by designing of a suitable passive harmonic LC filter for an improved power quality output. The modification thus suggested, has also been justified with simulation results.