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Energies 2016, 9(5), 380;

Analysis and Minimization of Output Current Ripple for Discontinuous Pulse-Width Modulation Techniques in Three-Phase Inverters

Department of Electrical, Electronic, and Information Engineering, University of Bologna, Viale Risorgimento 2, Bologna 40136, Italy
Department of Engineering Sciences, Ångström Laboratory, Uppsala University, Lägerhyddsvägen 1, Box 534, Uppsala S-751 21, Sweden
Author to whom correspondence should be addressed.
Academic Editor: Ali M. Bazzi
Received: 5 April 2016 / Revised: 4 May 2016 / Accepted: 6 May 2016 / Published: 19 May 2016
(This article belongs to the Special Issue Power Electronics Optimal Design and Control)


This paper gives the complete analysis of the output current ripple in three-phase voltage source inverters considering the different discontinuous pulse-width modulation (DPWM) strategies. In particular, peak-to-peak current ripple amplitude is analytically evaluated over the fundamental period and compared among the most used DPWMs, including positive and negative clamped (DPWM+ and DPWM−), and the four possible combinations between them, usually named as DPWM0, DPWM1, DPWM2, and DPWM3. The maximum and the average values of peak-to-peak current ripple are estimated, and a simple method to correlate the ripple envelope with the ripple rms is proposed and verified. Furthermore, all the results obtained by DPWMs are compared to the centered pulse-width modulation (CPWM, equivalent to the space vector modulation) to identify the optimal pulse-width modulation (PWM) strategy as a function of the modulation index, taking into account the different average switching frequency. In this way, the PWM technique providing for the minimum output current ripple is identified over the whole modulation range. The analytical developments and the main results are experimentally verified by current ripple measurements with a three-phase PWM inverter prototype supplying an induction motor load. View Full-Text
Keywords: inverters; pulse-width modulation (PWM); harmonic distortion; ripple minimization inverters; pulse-width modulation (PWM); harmonic distortion; ripple minimization

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Grandi, G.; Loncarski, J.; Srndovic, M. Analysis and Minimization of Output Current Ripple for Discontinuous Pulse-Width Modulation Techniques in Three-Phase Inverters. Energies 2016, 9, 380.

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