CJEE

Chinese Journal of Electrical Engineering ›› 2019, Vol. 5 ›› Issue (1): 1-10.

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Quasi-Z-Source Based Bidirectional DC-DC Converter and Its Control Strategy

Yuba Raj Kafle*, Saad Ul Hasan, Graham E. Town   

  1. School of Engineering, Macquarie University, NSW 2109, Australia
  • Online:2019-01-20 Published:2019-01-20
  • About author:Yuba Raj Kafle received his B.E. and M. S degree in electrical engineering from Tribhuvan University, Nepal, and Xi’an Jiaotong University, Xi’an China. He is currently working towards his Ph.D at the Sustainable Energy Systems Engineering Research group, Macquarie University, Australia. His current research interests include impedance-source converters, grid connected photovoltaic inverters, distributed power generation and power quality.
    Mr. Kafle is a frequent reviewer of APEC, ECCE, IET power electronics, and IEEE access.
    Saad Ul Hasan (S’09-M’19) received his B.S and M.S degrees in electrical engineering respectively from Bahria University, Islamabad, Pakistan, and Xi’an Jiaotong University (XJTU), Xi’an, China. From September 2011 to July 2013, he was with Power Electronics & Renewable Energy Research Center (PEREC), as a Graduate Student with XJTU. He finished his PhD in electronics engineering from Macquarie University, Australia in 2018 and currently working as an honorary Research Associate at University of Technology, Sydney, Australia.
    During the summer of 2017, he was a visiting scholar at Miami university, Ohio, USA where worked on novel common-ground transformerless inverters for grid connected PV systems. His research interests include DC-DC and DC-AC power converters, EMI suppression in power converters, and wide bandgap (GaN/SiC) based high frequency power converters.
    Mr. Hasan is a frequent reviewer of APEC, ECCE, IET power electronics, JESTPE and transactions on Industrial Electronics. He is also an active IEEE member and currently serving as Mentor Chair in IEEE NSW section.
    Graham E. Town received the B.E. degree with first class honors from the New South Wales Institute of Technology, Sydney, Australia, in 1984 and the Ph.D. degree from the University of Sydney, Sydney, Australia, in 1992.
    From 1978 to 1985, he was with Amalgamated Wireless Australasia, where he was a Trainee Engineer, and subsequently Engineer, and worked on a variety of projects including the Interscan microwave landing system and the development of first generation optical fiber communication systems. In 1985, he joined the Department of Electrical Engineering at the University of Sydney to undertake research in the area of nuclear magnetic resonance imaging, and was appointed Lecturer in 1991. In 2002 he joined the Department of Electronics at Macquarie University, Sydney, Australia, where he established that University's undergraduate engineering degree program. He is currently a Professor in the School of Engineering. He is author or coauthor of more than 200 refereed journal and conference papers and several patents. His research contributions have been diverse, including nuclear magnetic resonance imaging and spectroscopy, guided-wave optics and photonics, terahertz wireless technology, power electronics and power systems, and engineering education.
    Professor Town is a Fellow of the Institute of Engineers Australia, and a Senior Member of the IEEE.
  • Supported by:
    yuba-raj.kafle@students.mq.edu.au

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Abstract: This paper presents a quasi-Z-source based isolated bidirectional DC-DC converter (qZIBDC) for renewable energy applications. The converter utilizes a dual active bridge circuit with a quasi-Z-source network on both sides, so the converter works as buck/boost converter from either side. It has a wider input/output voltage operating range, soft-switching capabilities without additional devices, and higher boost capability than a traditional dual active bridge circuit. Apart from that, shoot-through states are incorporated in its operating cycle to boost the input voltage resulting in high reliability of the proposed converter. Due to the symmetrical structure of the circuit, there is no defined high voltage or low voltage side as in traditional isolated bidirectional DC-DC converter. The operating principle and control strategy of the proposed converter are presented. Simulation and experimental results are provided to verify the effectiveness of the proposed converter topology and its control strategy.

Key words: Bidirectional DC-DC converter, dual active bridge, impedance source, quasi-Z-source DC-DC converter