Analysis & Comparison of Harmonics Reduction Topologies for Three Phase Bridge Inverter

This paper describes analysis and comparison of three different topologies for reduction of harmonic contents in three phase bridge inverter with 180 degree mode of conduction. IEEE standard 519-1992 is a useful document for understanding harmonics and applying harmonic limits in power systems. Three different topologies are basic inverter operation with no harmonics reduction, second is passive filter by using combination of inductor- capacitor elements (LC circuit) and third is pulse width modulation technique. Here in this paper sinusoidal pulse width modulation technique is explained. Three circuits are simulated in MATLAB simulink for harmonics analysis in fast Fourier transform (FFT). Out of Three topologies sinusoidal pulse width is best method for reduction of harmonics. Level of harmonics is analysed using Total harmonic Distortion (THD).In addition to this work Active Filter circuit can also be used to minimize the THD level by implementing series active filter for current waveform and shunt active filter for voltage waveform for three phase circuit.