Hardware Design and Implementation of Microcontroller Based Reduced Switch Multilevel Inverter Topology for Harmonic Studies Using MRPWM

ABSTRACT Multilevel inverter (MLI) is the recent advancement in power electronics which employed to synthesize a high-quality output voltage waveform. This paper focuses on developing a single phase modified nine-level inverter with the reduced number of switches for improving the quality of output voltage waveform. Single carrier and multireference Pulse Width Modulation (PWM) technique is utilized for generating the switching pulses. The proposed topology consists of a single DC source, level generation part (balancing capacitor and bidirectional switches) and polarity generation part (H-Bridge). The operation of the proposed topology is examined for generating 9-level output voltage using MATLAB/SIMULINK. The result of the proposed topology is verified through laboratory-based prototype model. For experimental setup, the switching pulses are generated by PIC16F877A microcontroller. This proposed lab experimental and simulation can be used to study the value of %THD at output side of the inverter.