Simulation of SHE-PWM for multilevel inverter

Joycelyn , Goh May Yuen (2014) Simulation of SHE-PWM for multilevel inverter. Project Report. UTeM. (Submitted)

Text SIMULATION OF SHE-PWM FOR MULTILEVEL INVERTER 24pages.pdf Download (394kB)

Abstract

Multilevel inverters have been receiving increasing attention in power system nowadays. The major problem for inverter is the harmonic distortion that will affect the performance and contribute in power losses. Thus, there are a variety of control techniques for inverters are introduced but less of the techniques can used to reduce the harmonic at low frequency. The harmonic at low frequency must be reduced due to some equipments are sensitive to the low frequency harmonic. Selective harmonic elimination pulse-width modulation (SHE-PWM) is a technique that can be used to eliminate the harmonic at low frequency which difficult to reduce by using passive filter. SHE-PWM is a low switching frequency strategy that uses Fourier Series and Newton-Raphson analysis to calculate the switching angles for elimination of harmonic. In this research, the main objective is to study the control technique for multilevel inverter and simulate the SHE-PWM for multilevel inverter. The performance of output waveform and total harmonic distortion (THD) for multilevel inverter are analysed and discussed. MATLAB program is important in this research. It is use to calculate the angle of PWM and simulate the SHE-PWM for multilevel inverter. The result shows that the percentage of harmonic at low harmonic order for SHE-PWM had been eliminated compare with other methods. In conclusion, the SHE-PWM technique can eliminate the selected harmonic at lower harmonic order.

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