Variable Switching Frequency PWM for Three-Phase Four-Wire Split-Capacitor Inverter Performance Enhancement

Three-phase, four-wire, split-capacitor inverters, thanks to their capability to deal with unbalanced systems, are currently employed in photovoltaic installations, electric vehicles battery chargers, active power filters, and many other grid-tied applications. The minimization of ac output current...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2021-12, Vol.36 (12), p.13674-13685
Main Authors: Mandrioli, Riccardo, Viatkin, Aleksandr, Hammami, Manel, Ricco, Mattia, Grandi, Gabriele
Format: Article
Language:English
Subjects:
Alternating current
Battery chargers
Capacitors
Charging
Converters
Current ripple
Electric filters
Electric vehicles
Electronic equipment
Harmonic analysis
Inverters
Modulation
Optimization
Peak values
Performance enhancement
Phase current
Power factor
Pulse width modulation
Ripples
Switches
Switching
Switching frequency
Switching loss
three-phase split-capacitor inverter
Unbalance
variable switching frequency PWM
Wire
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Summary:Three-phase, four-wire, split-capacitor inverters, thanks to their capability to deal with unbalanced systems, are currently employed in photovoltaic installations, electric vehicles battery chargers, active power filters, and many other grid-tied applications. The minimization of ac output current ripple and switching losses positively impacts the inverter's efficiency, volume, weight, and cost optimization. For this reason, a novel variable switching frequency driving strategy independently tunable on each phase is proposed in this article. Taking advantage of phase current ripple prediction, a proper variable switching frequency strategy is applied for obtaining a flat current ripple profile. Having tuned the driving strategy parameters, it is possible to optimize and compare individual metrics such as the maximum peak-to-peak value of the current ripple, current ripple rms, average switching frequency, and switching losses. By applying the proposed modulation method, a significant inverter performance enhancement has been obtained. Converter efficiency is improved without introducing detrimental effects on the current harmonic quality. Analytical derivations are expressed as a modulating index function and the power factor for balanced and unbalanced systems. All the theoretical developments are verified throughout numerical simulations and experimental tests.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2021.3089610