本論文旨在開發一風力切換式磁阻發電機為主之雙極性直流微電網。首先，建立實驗型之風力切換式磁阻發電機，使用一變頻器供電永磁同步馬達作為發電機之替代風渦輪機，並裝設適當之外激電源以成功發電建立電壓。採用磁滯電流控制脈波寬度調變機構，提高線圈電流控制之強健性，以對抗反電動勢效應。透過適當電壓命令之設定、強健電壓控制及動態換相移位，獲得在變動轉速下改善之輸出電壓特性。
接著，建構切換式磁阻發電機後接之三階升壓介面轉換器，建立電壓調節特性良好之微電網雙極性直流匯流排。並由所提均壓控制架構降低雙極性直流匯流排之電壓不平衡。此外，使用簡易之強健電壓控制，強化電壓調節控制之強健性及性能。其次，開發一蓄電池儲能系統，提供所建雙極性直流微電網之能源支撐，蓄電池經一雙向升/降壓直流/直流轉換器介接至微電網之匯流排，搭配適當之控制，獲得良好之充、放電特性。再者，配裝一傾卸式負載，避免能源過剩所造成之匯流排過壓。
第三，建構一單相三線負載變頻器作為測試負載，應用比例共振控制得到良好之交流電壓波形及動態響應特性，用以從事單向微電網至家用負載之操作。最後，以實測結果觀察所建構雙極性直流微電網之總體操作特性。

The development of a wind switched-reluctance generator (SRG) based bipolar DC microgrid is presented in this thesis. First, the experimental wind SRG system is established. An inverter-fed permanent-magnet synchronous motor (PMSM) is employed as an alternative wind turbine. And a proper external excitation source is equipped for successful voltage building. The hysteresis current-controlled PWM scheme is used to enhance the winding current control robustness against the effects of back electromotive force. Then, the improved generated voltage under varying wind speed is achieved through adequate voltage command setting, robust voltage control and dynamic commutation shift.
Next, the SRG followed three-level boost interface converter is constructed to establish a well-regulated bipolar common DC bus. The voltage-balancing control scheme is proposed to reduce the voltage unbalance of bipolar DC bus. Moreover, the simple robust voltage control is used to enhance the voltage regulation ability. To provide the energy support for the established bipolar DC microgrid, the battery energy storage system is developed. A bidirectional buck/boost DC/DC converter with proper control is used as an interface converter. Good charging and discharging performances are evaluated experimentally. In addition, a chopped dump load is equipped to prevent the common DC bus from over-voltage due to the energy surplus.
Third, a single-phase three-wire load inverter is established and used as a test load. The proportional-resonant (PR) controller is designed to yield good AC voltage waveforms and dynamic performance. Then, the unidirectional microgrid-to-home (M2H) operation control is conducted. Finally, the characteristics of the established whole bipolar DC microgrid are observed. Some measured results are presented to demonstrate their dynamic responses and steady-state characteristics.

ABSTRACT i
ACKNOWLEDGEMENT ii
LIST OF CONTENTS iii
LIST OF FIGURES vi
LIST OF TABLES xiii
LIST OF SYMBOLS xiv
LIST OF ABBREVIATION xxiii
CHAPTER 1 INTRODUCTION 1
CHAPTER 2 OVERVIEW OF MICROGRID CONSTITUTED COMPONENTS 5
2.1 Introduction 5
2.2 Microgrids 5
2.3 Wind Generators 7
2.3.1 Wind Turbines 7
2.3.2 Governing Equations and Power Characteristics 8
2.3.3 Typical Wind Generators 9
2.4 Switched-Reluctance Machines 11
2.4.1 Motor Structures 11
2.4.2 Governing Equations and Dynamic Modeling 13
2.4.3 SRM Converters 15
2.4.4 Some Key Issues of SRG 18
2.5 Energy Storage Devices 19
2.6 Interface Converters 20
2.7 PWM Inverters 22
2.7.1 Single-Phase SPWM Inverters 22
2.7.2 Possible Single-phase Three-wire Inverters 24
CHAPTER 3 THE DEVELOPED WIND SWITCHED-RELUCTANCE GENERATOR 26
3.1 Introduction 26
3.2 Power Circuit 26
3.3 Sensing and Interfacing Circuits 30
3.4 Control Schemes 32
3.5 Performance Evaluation 37
3.6 Re-evaluation of the SRG System 43
CHAPTER 4 MICROGRID BIPOLAR DC-BUS ESTABLISHMENT 45
4.1 Introduction 45
4.2 Capacitive Voltage Divider 45
4.3 Two-level Boost Converter and Voltage Balancer 45
4.3.1 Circuit Operation 46
4.3.2 Power Circuit 47
4.3.3 Control Schemes 50
4.3.4 Experimental Results 53
4.4 Three-level Boost Converter 54
4.4.1 Circuit Operation and Transfer Characteristics 54
4.4.2 Energy Storage Inductor 56
4.4.3 Control Schemes 57
4.4.4 Performance Evaluation 59
4.5 Interleaved Three-level Boost Converter 66
4.5.1 Circuit Operation and Transfer Characteristics 66
4.5.2 Energy Storage Inductor 69
4.5.3 Performance Evaluation 70
4.6 Wind SRG Based Bipolar DC Microgrid 76
CHAPTER 5 WHOLE SWITCHED-RELUCTANCE GENERATOR BASED BIPOLAR DC MICROGRID 81
5.1 Introduction 81
5.2 Battery Energy Storage System 81
5.2.1. Power Circuit 81
5.2.2. Control Scheme 83
5.2.3. Measured Results 85
5.3 Single-phase Three-wire Inverter 87
5.3.1 System Configuration 87
5.3.2 Dynamic Model 89
5.3.3 Control Scheme 91
5.3.4 Measured Results 93
5.4 The Whole Wind SRG Powered Bipolar DC Microgrid 97
CHAPTER 6 CONCLUSIONS 103
REFERENCES 104

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(a) Switched-reluctance Motor
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(b) Switched-reluctance Generators
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(c) Converters for Switched-reluctance Machines
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C. Energy Storage System
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D. Interface Power Converters
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E. PWM Inverters
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