摘 要 I
ABSTRACT II
誌 謝 III
TABLE OF CONTENTS IV
LIST OF TABLES VII
LIST OF FIGURES VIII
CHAPTER 1. INTRODUCTION 1
1.1. Background and Motivations 1
1.2. Review of Literature 3
1.2.1. Control of Interconnected DG Systems 5
1.2.2. Islanding Detection Methods 7
1.3. Research Objective and Method 9
1.4. Contributions of the Thesis 10
1.5. Organization of the Thesis 12
CHAPTER 2. SYSTEM CONFIGURATION 14
2.1. Introduction 14
2.2. Microgrid System Architecture 14
2.3. Operation Modes of the Microgrid 16
2.3.1. Grid-connected Operation Mode 16
2.3.2. Transition from Grid-connected Mode to Islanded Mode 17
2.3.3. Islanded Operation Mode 18
2.3.4. Transition from Islanded Mode to Grid-connected Mode 19
2.4. Distributed Generation System 20
2.4.1. DC-DC Power Converter 23
2.4.2. DC-AC Power Converter 26
2.5. Summary 31
CHAPTER 3. PROPOSED CONTROLLERS FOR MICROGRID SYSTEM 32
3.1. Introduction 32
3.2. Power Flow Controller 33
3.2.1. Grid-connected Operation Mode 36
3.2.2. Islanded Operation Mode 39
3.3. Single-Phase Synchronous d-q Frame Voltage Controller 40
3.4. Proposed Islanding Detection Controller 45
3.5. Control Circuit Design 48
3.5.1. DSP Interface Circuit (TMS320LF2407A) 49
3.5.2. Feedback Circuit Design 50
3.5.3. Switches Driver Circuit 55
3.6. Summary 55
CHAPTER 4. SIMULATION AND EXPERIMENTAL RESULTS 57
4.1. Introduction 57
4.2. Test System Specifications 57
4.3. Simulation Results 61
4.3.1. Grid-connected Operation Mode 61
4.3.2. Islanded Operation Mode 68
4.4. Experimental Results 77
4.4.1. Grid-connected Operation Mode 78
4.4.2. Islanded Operation Mode 83
4.5. Summary 93
CHAPTER 5. CONCLUSIONS AND FUTURE PROSPECTS 95
5.1. Conclusions 95
5.2. Future Prospects 96
REFERENCES 98
|