Study of Various Modes of Conduction of 3 Phase Inverter and its Harmonic Impacts on Output Voltage with the help of Filters

Abstract: Inverters are widely used in Switch Mode Power Supply (SMPS), Flexible AC Transmission System, Variable Frequency Drives (VFD), Active High Power Filters High Voltage Direct Current (HVDC) Systems, Renewable Power Conversion Systems as well as in different industrial and domestic processes. Power electronic inverters are very popular for fast response and precise control. In this paper conventional modes of conduction such as 180° and 120° are compared with different modes of conduction such as 80°, 90°, 110°, 130°, 140°, 150°, 160° and 170° of Three-Phase IGBT based Voltage Source Inverter (VSI) on MATLAB Simulink. A detailed comparative harmonics analysis is carried out explaining the reduction in Total Harmonic Distortion (THD) when Voltage Source Inverter (VSI) is operated at different conduction modes. The effect of filters on harmonics is also studied in this paper. Simulation results for 3 Phase inverters with and without filters and impact on harmonics have been presented. The line to Line and Line to Ground voltage waveform results are evaluated. The design is tested on resistive and inductive loads, proving 150° as the best suitable mode of operation of VSI for different loads. The objective of the research is to design an efficient inverter for domestic and industrial purposes. The simulation is done at higher voltages so that practical implementation becomes easier.