About the Authors ix
Preface xi
Acknowledgments xiii
1 Introduction: Modern Wind Energy and its Origins 1
1.1 Modern Wind Turbines 2
1.2 History of Wind Energy 10
References 21
2 Wind Characteristics and Resources 23
2.1 Introduction 23
2.2 General Characteristics of the Wind Resource 24
2.3 Characteristics of the Atmospheric Boundary Layer 36
2.4 Wind Data Analysis and Resource Estimation 53
2.5 Wind Turbine Energy Production Estimates Using
Statistical Techniques 63
2.6 Regional Wind Resource Assessment 65
2.7 Wind Prediction and Forecasting 72
2.8 Wind Measurement and Instrumentation 74
2.9 Advanced Topics 84
References 87
3 Aerodynamics of Wind Turbines 91
3.1 General Overview 91
3.2 One-dimensional Momentum Theory and the Betz Limit 92
3.3 Ideal Horizontal Axis Wind Turbine with Wake Rotation 96
3.4 Airfoils and General Concepts of Aerodynamics 101
3.5 Blade Design for Modern Wind Turbines 115
3.6 Momentum Theory and Blade Element Theory 117
3.7 Blade Shape for Ideal Rotor without Wake Rotation 121
3.8 General Rotor Blade Shape Performance Prediction 124
3.9 Blade Shape for Optimum Rotor with Wake Rotation 131
3.10 Generalized Rotor Design Procedure 133
3.11 Simplified HAWT Rotor Performance Calculation Procedure 138
3.12 Effect of Drag and Blade Number on Optimum Performance 139
3.13 Computational and Aerodynamic Issues in Aerodynamic Design 141
3.14 Aerodynamics of Vertical Axis Wind Turbines 145
References 153
4 Mechanics and Dynamics 157
4.1 Background 157
4.2 Wind Turbine Loads 158
4.3 General Principles of Mechanics 161
4.4 Wind Turbine Rotor Dynamics 172
4.5 Methods for Modeling Wind Turbine Structural Response 200
References 202
5 Electrical Aspects of Wind Turbines 205
5.1 Overview 205
5.2 Basic Concepts of Electrical Power 206
5.3 Power Transformers 217
5.4 Electrical Machines 219
5.5 Power Converters 237
5.6 Electrical Aspects of Variable-Speed Wind Turbines 246
5.7 Ancillary Electrical Equipment 253
References 255
6 Wind Turbine Materials and Components 257
6.1 Overview 257
6.2 Material Fatigue 257
6.3 Wind Turbine Materials 266
6.4 Machine Elements 270
6.5 Principal Wind Turbine Components 276
References 308
7 Wind Turbine Design and Testing 311
7.1 Overview 311
7.2 Design Procedure 312
7.3 Wind Turbine Topologies 316
7.4 Wind Turbine Standards, Technical Specifications, and Certification 322
7.5 Wind Turbine Design Loads 325
7.6 Load Scaling Relations 333
7.7 Power Curve Prediction 336
7.8 Computer Codes for Wind Turbine Design 340
7.9 Design Evaluation 345
7.10 Wind Turbine and Component Testing 346
References 355
8 Wind Turbine Control 359
8.1 Introduction 359
8.2 Overview of Wind Turbine Control Systems 364
8.3 Typical Grid-connected Turbine Operation 370
8.4 Supervisory Control Overview and Implementation 374
8.5 Dynamic Control Theory and Implementation 382
References 404
9 Wind Turbine Siting, System Design, and Integration 407
9.1 General Overview 407
9.2 Wind Turbine Siting 408
9.3 Installation and Operation Issues 416
9.4 Wind Farms 419
9.5 Wind Turbines and Wind Farms in Electrical Grids 433
References 446
10 Wind Energy Applications 449
10.1 General Overview 449
10.2 Distributed Generation 450
10.3 Hybrid Power Systems 450
10.4 Offshore Wind Energy 461
10.5 Operation in Severe Climates 478
10.6 Special Purpose Applications 480
10.7 Energy Storage 489
10.8 Fuel Production 497
References 501
11 Wind Energy System Economics 505
11.1 Introduction 505
11.2 Overview of Economic Assessment of Wind Energy Systems 506
11.3 Capital Costs of Wind Energy Systems 511
11.4 Operation and Maintenance Costs 519
11.5 Value of Wind Energy 521
11.6 Economic Analysis Methods 530
11.7 Wind Energy Market Considerations 539
References 543
12 Wind Energy Systems: Environmental Aspects and Impacts 547
12.1 Introduction 547
12.2 Avian/Bat Interaction with Wind Turbines 549
12.3 Visual Impact of Wind Turbines 556
12.4 Wind Turbine Noise 561
12.5 Electromagnetic Interference Effects 573
12.6 Land-Use Environmental Impacts 582
12.7 Other Environmental Considerations 585
References 589
Appendix A Nomenclature 593
A.1 Note on Nomenclature and Units 593
A.2 Chapter 2 593
A.3 Chapter 3 595
A.4 Chapter 4 597
A.5 Chapter 5 601
A.6 Chapter 6 604
A.7 Chapter 7 606
A.8 Chapter 8 607
A.9 Chapter 9 608
A.10 Chapter 10 610
A.11 Chapter 11 612
A.12 Chapter 12 613
A.13 Abbreviations 614
Appendix B Problems 617
B.1 Problem Solving 617
B.2 Chapter 2 Problems 617
B.3 Chapter 3 Problems 621
B.4 Chapter 4 Problems 628
B.5 Chapter 5 Problems 632
B.6 Chapter 6 Problems 637
B.7 Chapter 7 Problems 639
B.8 Chapter 8 Problems 642
B.9 Chapter 9 Problems 647
B.10 Chapter 10 Problems 652
B.11 Chapter 11 Problems 656
B.12 Chapter 12 Problems 658
Appendix C Data Analysis and Data Synthesis 661
C.1 Overview 661
C.2 Data Analysis 661
C.3 Data Synthesis 671
References 675
Index 677
