Kwok, Samuel Tin-Chu2024-08-142024-08-1419931993https://hdl.handle.net/1828/18514Power 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.121 pagesAvailable to the World Wide WebUN SDG 7: Affordable and Clean EnergyThesis