A novel symmetrical multilevel inverter topology with reduced switching devices using different PWM techniques

Multi-level inverter has a capability to handled high power high voltage with less total harmonic distortion (THD), reduced switching losses and good power quality due to which in recent year they become more popular in high power high voltage application, with Increase in the voltage level, harmonic content in output voltage waveform will decrease. Multi-level has some disadvantage that their complexity requires greater count of power devices and has complex control circuitry. This paper present a novel multi-level inverter topology using H-bridge with other switches and which is implemented in single-phase, three-phase 7-level multi-level inverter using different PWM technique. This topology has less count of power switches, capacitor, diode and less complexity as compare to other multilevel inverter. For 7-level multi-level inverter multicarrier PWM technique is used to generate different output voltage level. Simulation result of and 7-level can be obtained by MATLAB/SIMULINK software.