Brushless Doubly-Fed Machines: Opportunities and Challenges

Chinese Journal of Electrical Engineering ›› 2018, Vol. 4 ›› Issue (2): 1-17.

Brushless Doubly-Fed Machines: Opportunities and Challenges

Peng Han¹, Ming Cheng^1,*, Sul Ademi², Milutin G. Jovanović³

1. School of Electrical Engineering, Southeast University, Nanjing 210096, China;
2. Warwick Manufacturing Group, University of Warwick, Coventry, UK;
3. Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, UK

Online:2018-06-25 Published:2019-10-31
Contact: * , Email: mcheng@seu.edu.cn.
About author:Peng Han (S'12-M'17) received the B.Sc. and Ph.D. degrees in Electrical Engineering from the School of Electrical Engineering, Southeast University, Nanjing, China, in 2012 and 2017, respectively. From November 2014 to November 2015, he was a joint Ph.D. student funded by China Scholarship Council with the Department of Energy Technology, Aalborg University, Aalborg, Denmark, where he focused on the brushless doubly-fed machines for wind energy conversion and high power drive. He is currently a Rsearch Scientist with the Center for High Performance Power Electronics (CHPPE), Department of Electrical and Computer Engineering, The Ohio State University. His current research interests include electric machines and power electronics. Ming Cheng (M'01-SM'02-F'15) received the B.Sc. and M.Sc. degrees in Electrical Engineering from the Department of Electrical Engineering, Southeast University, Nanjing, China, in 1982 and 1987, respectively, and the Ph.D. degree from the Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong, in 2001. Since 1987, he has been with Southeast University, where he is currently a Chair Professor in the School of Electrical Engineering and the Director of the Research Center for Wind Power Generation. From January to April 2011, he was a Visiting Professor with the Wisconsin Electric Machine and Power Electronics Consortium, University of Wisconsin, Madison. His teaching and research interests include electrical machines, motor drives for electric vehicles, and renewable energy generation. He has authored or coauthored over 380 technical papers and 4 books and is the holder of over 100 patents in these areas. Prof. Cheng is a fellow of the Institution of Engineering and Technology. He has served as chair and organizing committee member for many international conferences. He is a Distinguished Lecturer of the IEEE Industry Applications Society(IAS) in 2015/2016. Sul Ademi (M'12) received the B.Eng. and Ph.D. degrees in Electrical and Electronics Engineering from Northumbria University at Newcastle upon Tyne, U.K., in 2011 and 2014, respectively. From 2015 to 2017, he was a Lead Researcher engaged in knowledge exchange and transfer partnership activities between University of Strathclyde, Glasgow, U.K and GE Grid Solutions, Stafford, U.K., where he focused on the development of novel DC protection schemes suitable for protecting future high-voltage direct current (HVDC) transmission systems. He is currently a Research Scientist with the Warwick Manufacturing Group, University of Warwick, Coventry, U.K. His main interests are in the areas of electric motor drives, validation of high-performance controllers for variable-speed applications, applications and control of doubly-fed machines, and design and analysis of novel permanent-magnet machines. Milutin G. Jovanovic (M'99-SM'05) received the Dipl.Eng and M.E.E. degrees from the University of Belgrade, Belgrade, Serbia, in 1987 and 1991, respectively, and the Ph.D. degree from the University of Newcastle, Callaghan, Australia, in 1997, all in Electrical Power Engineering. He is currently an Associate Professor with the Faculty of Engineering and Environment at Northumbria University, Newcastle upon Tyne, U.K. He has published more than 150 journal and conference papers including many book chapters. His major interests and activities are in the areas of reluctance machine drives, control and applications of doubly-fed motors and generators, and wind energy conversion systems.

Abstract

Abstract: The brushless doubly-fed machine(BDFM) is a family of multiport electric machines with two ac electrical ports and a common mechanical port. Different from the conventional singly-fed machines whose synchronous speed is solely determined by a single supply frequency and the actual pole pair number, the BDFM has two supply frequencies and two different pole pair numbers to control the rotor speed. By the two accessible electrical ports, all BDFMs are endowed with more degrees of freedom for speed and power control, inherent fault-tolerant capability and high reliability. The BDFM in its broad sense has been extensively investigated as a promising alternative to the conventional slip-ring doubly-fed induction machine(DFIM) during the past decades, for both limited and wide speed range applications. This paper presents a new theoretical framework of the BDFM within which all topological variants can be closely linked by the similarities in working principle. The individualities of each machine topology are presented first, followed by the commonalities such as the modeling techniques, modes of operation, design considerations and control strategies. The challenges are identified and highlighted based on recent developments and possible opportunities are predicted considering the unique nature of this special AC machine type.

Key words: Brushless doubly-fed machine, multiport electric machine, modeling techniques, modes of operation, design considerations, control strategies

Peng Han, Ming Cheng, Sul Ademi, Milutin G. Jovanović. Brushless Doubly-Fed Machines: Opportunities and Challenges[J]. Chinese Journal of Electrical Engineering, 2018, 4(2): 1-17.

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