Analysis of faults in three phase voltage source inverter

Nurul Asshikin , Kasim (2014) Analysis of faults in three phase voltage source inverter. Project Report. UTeM. (Submitted)

Text ANALYSIS OF FAULTS IN THREE PHASE VOLTAGE SOURCE INVERTER 24pages.pdf Download (506kB)

Abstract

This project presents the analysis of faults in 3 phase voltage source inverter (VSI). VSI is widely used in motor drive and power quality applications. The majority of fault related the power switches, such as open-circuit faults and short-circuit faults. The problem statement of this project is the high cost of maintenance, the power electronic damage and interrupt the manufacturing process. Then the objective is to identify and analyze generated fault using fast Fourier transform (FFT) and short time Fourier transform (STFT) technique. FFT is very useful in the analysis of harmonic and is an essential tool for filter design. It has some drawbacks such as losses of temporal information, so that it can only be used in the steady state and cannot show the moment when the event is produced. The STFT is applicable to non-stationary signals and it has been used in power quality analysis. The advantage of this technique is its ability to give the harmonic content of the signal at every time-period specified by a define window. But, this technique also has the limitation of fixed window width chosen a priority and this causes limitations for low-frequency and high-frequency non-stationary signal analysis at the same time. In this analysis, the parameter such as instantaneous rms current (Irms), average current and total harmonic distortion (THD) are used to identify the characteristic of the signals. Matlab software is used for simulation in this project.

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