Common DC-Link Capacitor Harmonic Current Minimization for Cascaded Converters by Optimized Phase-Shift Modulation
Xuanyi Zhou,
Wei Juin Choy,
Abraham M. Alcaide,
Shuo Wang,
Sandro Guenter,
Jose I. Leon,
Vito Giuseppe Monopoli,
Leopoldo G. Franquelo,
Marco Liserre,
Michael Galea,
Chris Gerada,
Giampaolo Buticchi
Affiliations
Xuanyi Zhou
Key Laboratory of More Electric Aircraft Technology of Zhejiang Province, Department of Electrical and Electronic Engineering, University of Nottingham Ningbo China, Ningbo 315104, China
Wei Juin Choy
Power Electronics, Machines and Control Group, University of Nottingham, Nottingham NG7 2RD, UK
Abraham M. Alcaide
Electronic Engineering Department, Universidad de Sevilla, 41004 Seville, Spain
Shuo Wang
Key Laboratory of More Electric Aircraft Technology of Zhejiang Province, Department of Electrical and Electronic Engineering, University of Nottingham Ningbo China, Ningbo 315104, China
Sandro Guenter
Key Laboratory of More Electric Aircraft Technology of Zhejiang Province, Department of Electrical and Electronic Engineering, University of Nottingham Ningbo China, Ningbo 315104, China
Jose I. Leon
Electronic Engineering Department, Universidad de Sevilla, 41004 Seville, Spain
Vito Giuseppe Monopoli
Department of Electrical and Information Engineering, Politecnico di Bari, 70126 Bari, Italy
Leopoldo G. Franquelo
Electronic Engineering Department, Universidad de Sevilla, 41004 Seville, Spain
Marco Liserre
Power Electronics Department, Christian-Albrechts Universität zu Kiel, 24118 Kiel, Germany
Michael Galea
Department of Industrial Electrical Power Conversion, University of Malta, MSD 2080 Msida, Malta
Chris Gerada
Power Electronics, Machines and Control Group, University of Nottingham, Nottingham NG7 2RD, UK
Giampaolo Buticchi
Key Laboratory of More Electric Aircraft Technology of Zhejiang Province, Department of Electrical and Electronic Engineering, University of Nottingham Ningbo China, Ningbo 315104, China
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%.
