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Three-Phase SCVD Based Boost Inverter with Low Common Mode Voltage for Transformerless Photovoltaic Grid-Connected System :Doctor of Philosophy - Major: Electrical Engineering
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Doctoral Dissertation
A Three-Phase SCVD Based Boost Inverter with
Low Common Mode Voltage for Transformerless
Photovoltaic Grid-Connected System
Department of Electrical Engineering
Graduate School, Chonnam National University
Tran Tan Tai
August 2020
A Three-Phase SCVD Based Boost Inverter with
Low Common Mode Voltage for Transformerless
Photovoltaic Grid-Connected System
Department of Electrical Engineering
Graduate School of Chonnam National University
Tran Tan Tai
Supervised by Professor Joon-Ho Choi
A dissertation submitted in partial fulfillment of the requirements for the Doctor of
Philosophy in Electrical Engineering.
Committee in Charge:
Prof. Young-Cheol Lim
Prof. In-Seon Yeo
Assit. Prof. Dong-Hee Kim
Dr. Minh-Khai Nguyen
Prof. Joon-Ho Choi
August 2020
i
Contents
Contents .................................................................................................................................... i
List of Figures ........................................................................................................................ iii
List of Tables ......................................................................................................................... vii
List of Abbreviations ............................................................................................................ viii
Abstract .................................................................................................................................. ix
Chapter 1. Introduction ........................................................................................................ 1
1.1. Research Background......................................................................................................... 1
1.1.1. Modulation-Based Methods........................................................................................... 4
1.1.2. Topology-Based Methods............................................................................................. 11
1.2. Research Focus ................................................................................................................ 15
1.3. Research Contributions................................................................................................... 15
1.4. Organization of the Dissertation ..................................................................................... 16
Chapter 2. Proposed Three-Phase SCVD Based Boost Inverter..................................... 18
2.1. Introduction .................................................................................................................... 18
2.2. Proposed Topology.......................................................................................................... 19
2.2.1. Common-Mode Leakage Current Model..................................................................... 19
2.2.2. Operation Principles..................................................................................................... 21
2.3. SVM Control Techniques for Proposed Topology ......................................................... 27
2.3.1. DPWM technique for Proposed Topology .................................................................. 27
2.3.2. Zero-Even PWM (ZEPWM) Technique for Proposed Topology................................ 29
2.3.3. Near State PWM (NSPWM) Technique for Proposed Topology................................ 31
2.4. Summary ......................................................................................................................... 31
Chapter 3. Modified Three-Phase SCVD Based Boost Inverter with Constant
Common-Mode Voltage for Photovoltaic Application..................................................... 34
3.1. Introduction .................................................................................................................... 34
ii
3.2. Proposed Topology.......................................................................................................... 34
3.3. PWM Control Strategy for Introduced Topology........................................................... 41
3.4. Comparison Between the Proposed Inverters and Existing Topologies......................... 42
Chapter 4. Simulation and Experimental Verifications................................................... 45
4.1. Three-Phase SCVD Based Boost Inverter ...................................................................... 45
4.1.1. Simulation Verifications .............................................................................................. 45
4.1.2. Experimental Verifications .......................................................................................... 58
4.2. Modified Three-Phase SCVD Based Boost Inverter ...................................................... 71
4.2.1. Simulation Verifications .............................................................................................. 71
4.2.2. Experimental Verifications .......................................................................................... 75
Chapter 5. Conclusions........................................................................................................ 81
References ............................................................................................................................ 82
Abstract by Korean ............................................................................................................. 91
Acknowledgement ............................................................................................................... 92