Total Harmonics Distortion Investigation in Multilevel Inverters

The multilevel began with the three level inverter. Use of conventional two – level pulse width modulation (PWM) inverter provide less distorted current and voltage but at cost of higher switching losses due to high switching frequency. Multilevel inverter are emerging as a viable alternative for high power , medium voltage application. This paper compare total harmonics distortion in three level and five level diode clamped multilevel inverter. Diode –clamped three phase topology is considered for study. A sinusoidal PWM technique is used to control the switches of the inverter. Simulation study confirms the reduction in harmonics distortion.