Investigation of Single-Phase, Single Voltage Source Multilevel Inverter with Voltage Boosting Gain Based on Different Sinusoidal Pulse Width Modulation Approach

Abstract

This paper investigated a single-phase, single voltage source multilevel inverter with voltage boosting gain based on different sinusoidal pulse width modulation approach. This article is meant for selection of appropriate modulation technique for proposed multilevel inverter topology. The proposed approach is formed by combination of MOSFET power switches, dc voltage doubler circuit, power cables, pulse-width generator circuits and resistive-inductive load. The system is capable of producing an output voltage of three-level and five-level depending on the amplitude of the reference signal. Among other pulse-width modulation techniques investigated, the two carrier signals with high frequency and one rectified reference signal with low frequency is adopted for the work. This article is used to verify the output current and voltage amplitude, total harmonic distortions based on different modulation schemes. The overall system is modeled and simulated in MATLAB/SIMULINK environment. The outcomes of the investigations are that: (i) rectified reference multiple carrier (RRMC) pulse width modulation scheme resulted in 58.24 % Voltage total harmonic distortion (THD), and 14.58 % Current THD for three level operation; and 30.39 % Voltage THD and 7.76 % Current THD for five-level operation, with an output average voltages of 94.27 V and 189 V for three and five levels respectively; (ii) single-reference multiple carrier pulse width modulation scheme resulted in 58.29 % Voltage THD and 14.58 % Current THD for three level operation and 30.44 % Voltage THD and 7.75 % Current THD for five level operation; with an output average voltages of 93.27 V and 188.5 V for three and five levels respectively. Performance assessment of the adopted method is validated by comparing the simulation and experimental results