Comparative Study Between Sinusoidal Pulse Width Modulation Technique And Six Step Technique For Voltage Source Inverter

Harin, Akal (2006) Comparative Study Between Sinusoidal Pulse Width Modulation Technique And Six Step Technique For Voltage Source Inverter. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This project discuss about inverters that transfers power from a DC source to an AC load. Inverters are widely used in motor drives, uninterruptible power supplies (ups), appliances run from an automobile battery and photovoltaic utility grid interface. This project presents a comparative study of performance between Sinusoidal Pulse Width Modulation (SPWM) and SIX STEP technique for voltage source inverter. The circuit of these techniques has been designed and analyzed using simulations software packages such as MATLAB 6.5 and ORCAD 9.1. The performance comparison of both techniques presented in terms of the appropriate Total Harmonic Distortion (THD), Fast Fourier Transformed (FFT) and Spectrum Analysis of the output waveforms. Basically, Total Harmonic Distortion describes the quality of the output waveform. Fast Fourier Transformed shows the selected signal wave and the analysis of voltage or current relative to fundamental or DC. While, Spectrum analysis explains a filter requirement in eliminating higher harmonic and unwanted noise. This project is divided into three importance stages of study. Firstly, to study on how to generate the switching SPWM signals to drive the power switches ( i.e MOSFETs , IGBTs) and to construct the topologies using Simulink-MATLAB 6.5 for SPWM and SIX-STEP inverters. Secondly, involves the discussion and performance comparison in terms of THD, FFT and Harmonic Spectrum for SIX-STEP and SPWM. Finally, this project presents the construction of schematics of the SIX-STEP and SPWM inverters using ORCAD 9.1 where the schematics can be represented as real practical experimental set-up. Simulation results using ORCAD 9.1 are in close agreement with simulation results using Simulink.

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