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Power Decoupling Methods for Reduced Capacitance Switched POWER DECOUPLING METHODS FOR REDUCED CAPACITANCE SWITCHED RELUCTANCE MOTOR DRIVE by Fan Yi APPROVED BY SUPERVISORY COMMITTEE: ___________________________________________ Dr. Babak Fahimi, Chair ___________________________________________ Dr. Mehrdad Nourani ___________________________________________ Dr. Dinesh K. Bhatia ___________________________________________ Dr. Bilal Akin Copyright 2017 Fan Yi All Rights Reserved To my family POWER DECOUPLING METHODS FOR REDUCED CAPACITANCE SWITCHED RELUCTANCE MOTOR DRIVE by FAN YI, BS DISSERTATION Presented to the Faculty of The University of Texas at Dallas in Partial Fulfillment of the Requirements for the Degree of DOCTOR OF PHILOSOPHY IN ELECTRICAL ENGINEERING THE UNIVERSITY OF TEXAS AT DALLAS August 2017 ACKNOWLEDGMENTS I would like to take this opportunity to thank all the people who have supported and helped me during my graduate study. I am extremely grateful to my advisor and the founding director of the Renewable Energy and Vehicular Technology (REVT) Laboratory, Dr. Babak Fahimi, who has always been supportive and guided me through my Ph.D. study. His illuminating and insightful view of power electronics and motor drives makes every discussion with him a wonderful and valuable learning experience. Dr. Fahimi also has provided numerous opportunities for me to obtain skills, gain experience, and meet with people from industry and academia. I am greatly honored to have him as my Ph.D. advisor. I would like to thank my committee members, Dr. Akin, Dr. Nourani and Dr. Bhatia, without whose valuable comments and suggestions I would not have completed my dissertation. My appreciation also goes to my friends and colleagues, especially Wen Cai and Zhuangyao Tang. I feel lucky to have their support both in research and life. Finally, I would like to show my gratitude to my parents, Jijun Yi and Wenhui Lei, for their endless and unconditional love. June 2017 v POWER DECOUPLING METHODS FOR REDUCED CAPACITANCE SWITCHED RELUCTANCE MOTOR DRIVE Fan Yi, PhD The University of Texas at Dallas, 2017 ABSTRACT Supervising Professor: Dr. Babak Fahimi Limited fossil fuel resources and environmental concerns are driving industries towards more energy efficient and environment friendly solutions. Players in the automotive industry are producing increasing amount of hybrid electric vehicles and full electric vehicles. Thus, the electric drive system, as an integral part of electric vehicles, is receiving substantial attention from both the industry and academia. Many commercially successful electric vehicles utilize permanent magnet synchronous motor (PMSM) in the electric drive system due to its high torque and power density, and high efficiency. However, in recent years, the uncertainty of the pricing of rare earth materials leads to extensive investigation of rare earth material-free electric machines. Among them, switch reluctance motor (SRM), featuring simple and rugged structure, low cost, and high reliability is a serious contender for electric vehicle applications. Due to its operation principle, the power of a SRM inherently greatly fluctuates in both motoring and generating modes of operation. This characteristic requires high capacitance in the SRM drive system, which causes increase in volume and decrease in reliability, thus preventing the adaptation of SRMs in electric vehicles, despite their advantages over other competing types of machines. vi Hence, a thorough investigation and methods of mitigation are important to encourage further adoption of SRMs in the automotive industry. In this dissertation, operation principle and energy conversion process in SRMs are introduced first to facilitate understanding of the high capacitance requirement in SRM drive systems. A topology that can greatly reduce such requirement is introduced, with its operation principle and control strategy analyzed. Methods to improve the control of the topology and to allow generating mode with SRMs are proposed. Furthermore, a generalized method of reducing capacitance requirement of SRM drive systems is developed. Based on the generalized method, a better topology is then proposed. The operation principle and control strategy of this topology are also discussed. Comprehensive simulations and experiments are conducted to validate the proposed methods, and the results are included in this dissertation. vii TABLE OF CONTENTS ACKNOWLEDGMENTS ...............................................................................................................v ABSTRACT ................................................................................................................................... vi LIST OF FIGURES ....................................................................................................................... xi LIST OF TABLES ....................................................................................................................... xiv CHAPTER 1 INTRODUCTION ...................................................................................................1 1.1 Background Information ..........................................................................................1 1.1.1 History of SRM ............................................................................................1 1.1.2 Operation Principle of SRM .........................................................................3 1.1.3 Energy Conversion in SRM .........................................................................8 1.1.4 Design and Control of Conventional SRM Drives.....................................14 1.2 Literature Review of Capacitance Reduction for Power Converters .....................18 1.3 Research Motivation and Objectives .....................................................................21 CHAPTER 2 POWER DECOUPLING WITH THE INTEGRATED MULTI-PORT CONVERTER........................................................................................................23 2.1 Introduction to the IMPC .......................................................................................23 2.2 Mode Analysis and Modeling ................................................................................27 2.2.1 Mode Analysis............................................................................................27 2.2.2 Modeling of the Drive System ...................................................................35 2.2.3 Current Ripple Coupling Relationship .......................................................43 2.3 Control Strategy .....................................................................................................47 2.3.1 Control Strategy Description ......................................................................47 2.3.2 Repetitive Control ......................................................................................49 2.3.3 Repetitive Controller Design ......................................................................51 2.4 Simulation and Experimental Results ....................................................................52 2.4.1 Simulation Results......................................................................................53 2.4.2 Experimental Results..................................................................................57 2.5 Summary ................................................................................................................63 viii CHAPTER 3 GENERALIZED POWER DECOUPLING AND THE QUASI-Z-SOURCE INTEGRATED MULTI-PORT CONVERTER ....................................................65 3.1 Generalized Power Decoupling Concept for SRM Drives ....................................66 3.2 Introduction to the Z-Source Family Converters ...................................................68 3.3 The Quasi-Z-Source Integrated Multi-Port Converter for SRM Drive .................71 3.3.1 Topology Derivation of the ZIMPC ...........................................................72 3.3.2 Capacitance Requirement Using the ZIMPC for SRM Drive ....................75 3.4 Control Strategy .....................................................................................................77 3.4.1 Mode Analysis............................................................................................77 3.4.2 Generalized Modeling ................................................................................82 3.4.3 Multi-Objective Control Method ...............................................................88 3.5 Simulation and Experimental Results ....................................................................90 3.5.1 Simulation Results......................................................................................90 3.5.2 Experimental Results..................................................................................95 3.6 Summary ..............................................................................................................104 CHAPTER 4 PRACTICAL CONSIDERATIONS ....................................................................106 4.1 Generating Mode of Operation ............................................................................106 4.1.1 SRM Drive System in Generating Operation ...........................................107 4.1.2 Generating Operation of the IMPC Topology..........................................107 4.1.3 Generating Operation of the ZIMPC topology ........................................116 4.2 Efficiency Analysis ..............................................................................................118
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