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Université Libre de Bruxelles Ph.D Thesis Contents

V

Contents

Acknowledgements ... I Abstract ... III Contents... V Nomenclature ... IX List of Figures ... XV List of Tables... XIX

Introduction ... 1

Overview ... 1

State of the art ... 1

What is missing? ... 3

Structure of the thesis and contribution... 3

Publications ... 4

Chapter 1 DC Power System Description and Analysis ... 7

1.1 Research Background ... 7

1.2 DC Power System Description ... 8

1.2.1 More Electric Aircraft ... 9

1.2.2 Automotive Power Generation ... 11

1.2.3 Wind Energy Generation Systems ... 12

1.2.4 Summary ... 13

1.3 Machine Candidates ... 14

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Université Libre de Bruxelles Ph.D Thesis Contents

VI

1.4 Comparison of Power Conversion Topologies ... 15

1.4.1 Boost Converter... 18

1.4.2 Buck Converter ... 18

1.4.3 Boost-Buck Converter ... 19

1.4.4 Thyristor ... 19

1.4.5 PWM Rectifier ... 20

1.5 Machine-Side Voltage Stabilization... 22

1.6 Fundamental DC Power System ... 23

1.7 PWM Rectifier Control Strategies ... 24

1.8 DC Load Modeling... 26

Chapter 2 Design Criteria and Optimization of PMSG for Variable-Speed Operation .. 29

2.1 System Definitions ... 29

2.2 Design Criteria ... 30

2.2.1 Definition of Reference Coordinates... 31

2.2.2 Preliminary Machine Design ... 32

2.2.3 Detailed Machine Design ... 41

2.3 Prototype Fabrication ... 45

2.3.1 Identification Tests ... 45

2.3.2 Sensitivity Analysis ... 48

2.4 Test Bench Description ... 50

2.4.1 Introduction to dSPACE... 50

2.4.2 Test Bench Description ... 51

2.5 Summary ... 53

Chapter 3 Traditional Control Strategies and Improvement with Active Damping ... 55

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Université Libre de Bruxelles Ph.D Thesis Contents

VII

3.1 System Analysis ... 55

3.1.1 DC-Link Modeling with Pure Resistor ... 56

3.1.2 Small-Signal Analysis ... 57

3.2 Field-Oriented Control ... 58

3.2.1 Theory ... 58

3.2.2 Active Damping ... 61

3.2.3 Inner Current Loops ... 63

3.2.4 FOC Simulation without Active Damping ... 65

3.2.5 FOC Simulation with Active Damping ... 70

3.2.6 Influence of Prime Mover Speed and Test Bench Implementation ... 72

3.3 Direct Torque Control ... 81

3.3.1 Theory ... 81

3.3.2 Flux Linkage Observation ... 84

3.3.3 DTC Switching Table... 85

3.3.4 Simulation and Experiments Considering Active Damping ... 87

3.3.5 Influence of Zero Vectors ... 94

3.4 Performance Comparison between FOC and DTC ... 95

3.4.1 DC-Link Voltage Ripples in Steady-State ... 95

3.4.2 DC-Link Voltage Excursion... 98

3.4.3 DC-Link Voltage Recovery Time ... 101

3.4.4 Armature Current THD ... 104

3.5 Summary ... 107

Chapter 4 Direct Voltage Control... 109

4.1 Direct Voltage Field-Oriented Control ... 109

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Université Libre de Bruxelles Ph.D Thesis Contents

VIII

4.1.1 Theory ... 109

4.1.2 Simulation and Experiments Considering Active Damping ... 112

4.2 Direct Voltage Control ... 118

4.2.1 Theory ... 118

4.2.2 DVC Category 1, Simulation and Experiments ... 122

4.2.3 DVC Category 2, Simulation and Experiments ... 131

4.3 Comparative Study ... 138

4.3.1 DC-Link Voltage Ripples in Steady-State ... 138

4.3.2 DC-Link Voltage Excursion... 141

4.3.3 DC-Link Voltage Recovery Time ... 144

4.3.4 Armature Current THD ... 147

4.3.5 Hardware and Control Block Requirements ... 150

4.4 Summary ... 151

Chapter 5 Conclusions and Future Work ... 153

5.1 Summary and Conclusions ... 153

5.2 Contributions, Achievements and Novelties ... 154

5.3 Perspectives and Future Work... 155

References ... 157

Appendix A Hardware Description ... 169

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