A Comprehensive AC Current Ripple Analysis and Performance Enhancement via Discontinuous PWM in Three-Phase Four-Leg Grid-Connected Inverters

Riccardo Mandrioli, Aleksandr Viatkin, Manel Hammami, Mattia Ricco and Gabriele Grandi
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Riccardo Mandrioli: Department of Electrical, Electronic, and Information Engineering, University of Bologna, 40136 Bologna, Italy
Aleksandr Viatkin: Department of Electrical, Electronic, and Information Engineering, University of Bologna, 40136 Bologna, Italy
Manel Hammami: Department of Electrical, Electronic, and Information Engineering, University of Bologna, 40136 Bologna, Italy
Mattia Ricco: Department of Electrical, Electronic, and Information Engineering, University of Bologna, 40136 Bologna, Italy
Gabriele Grandi: Department of Electrical, Electronic, and Information Engineering, University of Bologna, 40136 Bologna, Italy

Energies, 2020, vol. 13, issue 17, 1-32

Abstract: A complete analysis of the ac output current ripple in four-leg voltage source inverters considering multiple modulation schemes is provided. In detail, current ripple envelopes and peak-to-peak profiles have been determined in the whole fundamental period and a comprehensive method providing the current ripple rms has been achieved, all of them as a function of the modulation index. These characteristics have been determined for both phase and neutral currents, considering the most popular common-mode injection schemes. Particular attention has been paid to the performance of discontinuous pulse width modulation (DPWM) methods, including DPWMMAX and DPWMMIN, and their four most popular combinations DPWM0, DPWM1, DPWM2, and DPWM3. Furthermore, a comparison with a few continuous techniques (sinusoidal, centered pulse width modulations, and third harmonic injection) has been provided as well. Moreover, the average switching frequency and switching losses are analyzed, determining which PWM technique ensures minimum output current ripple within the linear modulation range at different assumptions. Numerical simulations and laboratory tests have been conducted to extensively verify all the analytical claims for all the considered PWM injections.

Keywords: inverter; three-phase; current ripple; harmonic distortion; four-leg; four-wire; pulse width modulation; optimization; switching losses; grid-connected (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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