Smoothed TCM-DPWM and Input Current Ripple Reduction for Three-Phase DC-AC ZVS Inverters

With the development of wide bandgap devices, the research and development of wide-frequency, high-efficiency, high-power-density three-phase inverters can play a positive role in the fields of electric vehicles, and microgrid. However, existing three-phase inverter schemes struggle to keep balance...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2024-12, Vol.39 (12), p.16283-16293
Main Authors: Feng, Yuan, Guan, Yueshi, Ben, Hongqi, Wang, Yijie, Yang, Shunfeng, Xu, Dianguo
Format: Article
Language:English
Subjects:
DC–AC converter
discontinuous pulsewidth modulation
Inductors
Inverters
Modulation
Switches
three-phase inverter
Topology
triangular current mode
Voltage
wide band-gap devices
Zero voltage switching
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Summary:With the development of wide bandgap devices, the research and development of wide-frequency, high-efficiency, high-power-density three-phase inverters can play a positive role in the fields of electric vehicles, and microgrid. However, existing three-phase inverter schemes struggle to keep balance among wide output frequency range, high efficiency, high power density, and low EMI, while maintaining simple hardware structure and control strategies. In this article, based on the three-phase two-level inverter topology with dc-link connected output capacitors, a novel triangular current mode discontinuous pulsewidth modulation (TCM-DPWM) method is proposed. This method achieves the aforementioned advantages with a simple hardware and offers higher efficiency compared to existing modulation techniques. Initially, a smoothed DPWM method is introduced to enable smooth transitions at unsmooth points. Building on this method, a TCM-based approach is further proposed to achieve zero voltage switching (ZVS) soft-switching, significantly reducing the turn- on losses of the switching devices. As the connection to dc-link of the output capacitors may lead to substantial input current ripple, two methods using resonant input filter and split output capacitors are presented to reduce this ripple. Employing the proposed methods, a prototype using GaN devices is constructed, achieving a full-load (490 W) efficiency of 98.478% and a power density of 245 W/in 3 . The prototype could reach an output frequency of up to 400 Hz, with the input current ripple reduced to about 10%.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2024.3440501