Common DC-Link Capacitor Harmonic Current Minimization for Cascaded Converters by Optimized Phase-Shift Modulation

Zhou, Xuanyi; Choy, Wei Juin; Alcaide, Abraham M.; Wang, Shuo; Guenter, Sandro; Leon, Jose I.; Monopoli, Vito Giuseppe; Franquelo, Leopoldo G.; Liserre, Marco; Galea, Michael; Gerada, Chris; Buticchi, Giampaolo

Abstract

This paper investigates the influence of a constant carrier phase shift on the DC-link capacitor harmonic current of cascaded converters used in fuel-cell and mild-hybrid electric vehicles. In these applications, a DC-DC converter can be adopted between the battery and the motor drive inverter in a cascaded structure, where the two converters share the same DC-link. Since the DC-link capacitor of such a system represents a critical component, the optimization of the converter operation to limit the current stress and extend the lifetime of the capacitor is an primary objective. This paper proposes the use of a carrier phase shift between the modulations of the two converters in order to minimize the harmonic current of the DC-link capacitor. By harmonic analysis, an optimal carrier phase shift can be derived depending on the converter configuration. Analytical results are presented and validated by hardware-in-the-loop experiments. The findings show that the pulse width modulation carrier phase shift between the interleaved boost converter and the voltage source motor drive inverter has a significant influence on the DC-link capacitor current and thus on its lifetime. A case study with two-cell and three-cell interleaved boost converters shows a possible DC-link capacitor lifetime extension of up to 390%.

Citation

Zhou, X., Choy, W. J., Alcaide, A. M., Wang, S., Guenter, S., Leon, J. I., Monopoli, V. G., Franquelo, L. G., Liserre, M., Galea, M., Gerada, C., & Buticchi, G. (2023). Common DC-Link Capacitor Harmonic Current Minimization for Cascaded Converters by Optimized Phase-Shift Modulation. Energies, 16(5), Article 2098. https://doi.org/10.3390/en16052098

• Journal Article Type: Article
• Acceptance Date: Jan 26, 2023
• Online Publication Date: Feb 21, 2023
• Publication Date: Mar 1, 2023
• Deposit Date: Dec 13, 2024
• Publicly Available Date: Dec 20, 2024
• Journal: Energies
• Electronic ISSN: 1996-1073
• Publisher: MDPI
• Peer Reviewed: Peer Reviewed
• Volume: 16
• Issue: 5
• Article Number: 2098
• DOI: https://doi.org/10.3390/en16052098
• Keywords: Energy (miscellaneous); Energy Engineering and Power Technology; Renewable Energy, Sustainability and the Environment; Electrical and Electronic Engineering; Control and Optimization; Engineering (miscellaneous); Building and Construction
• Public URL: https://nottingham-repository.worktribe.com/output/17665179
• Publisher URL: https://www.mdpi.com/1996-1073/16/5/2098