Power spectra of a three-phase inverter with random pulse width modulation modes
Date
1993
Authors
Kwok, Samuel Tin-Chu
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Abstract
Power inverters convert DC voltage to single- or multi-phase AC voltage. For three phase inversion, the voltage control is realized by means of Pulse-Width Modulation (PWM) of the switching variables a, b, and c which represent the control signals for individual phases of the inverter. In this thesis, analysis of the harmonic power spectra of the three-phase, voltage-controlled inverter with randomized lead-lag modes of operation will be presented. In these modes, the pulses of switching variables are either leading- or lagging-edge modulated. The randomized PWM technique provides non-repetitive switching patterns which result in spreading of distinct harmonic power over a wider frequency range. Experimental confirmation of the derived closed-form equations of both continuous and discrete spectra is provided. Further, a brief outline of the future work, which is to find the optimal switching pattern (i.e. probability density function) based on certain optimization criteria, is also presented.
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UN SDG 7: Affordable and Clean Energy