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Voltage Source Inverter Switches Faults Analysis Using S-Transform

M. Manap 1, A. R. Abdullah 2, N. Z. Saharuddin 2, N. A. Abidullah 2, N. S. Ahmad 2, and N. Bahari 2
1. Faculty of Engineering Technology, Universiti Teknikal Malaysia Melaka, Malaysia
2. Faculty of Electrical Engineering, Universiti Teknikal Malaysia Melaka, Malaysia
Abstract—Nowadays, voltage source inverter (VSI) is frequently used in power electronics system. This is due to its ability that can offer higher efficiency, high torque, simpler control system and improved power output. Thus, to ensure safety and reliability of a system, the development of appropriate fault detection technique for faults analysis is a must. This paper proposes S-transform which is time-frequency distribution (TFD) for analyzing VSI signal to detect and identify switches and types of faults. By using the TFD, the faults signal is translated into time-frequency representation (TFR) and then, parameters of the signal are estimated from the TFR. The signal parameters are such as instantaneous of rms current, rms fundamental current, average current, total waveform distortion (TWD), total harmonic distortion (THD) and total non-harmonic distortion (TnHD). Based on the signal parameters, the characteristics of the faults are calculated and used as input for faults detection and classification system. At the end of this research, the results show that the proposed TFD give better analysis for switches faults parameters estimation and suitable for detection and identification system. 
Index Terms—switches faults, S-transform, short time fourier transform, voltage source inverter

Cite: M. Manap, A. R. Abdullah, N. Z. Saharuddin, N. A. Abidullah, N. S. Ahmad, and N. Bahari, "Voltage Source Inverter Switches Faults Analysis Using S-Transform," International Journal of Electronics and Electrical Engineering, Vol. 4, No. 2, pp. 157-161, April 2016. doi: 10.18178/ijeee.4.2.157-161
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