Doubly Fed Induction Machine Modeling and Control for Wind Energy Generation [Hardcover]

This book will be focused on the modeling and control of the DFIM based wind turbines. In the first part of the book, the mathematical description of different basic dynamic models of the DFIM will be carried out. It will be accompanied by a detailed steady-state analysis of the machine. After that, a more sophisticated model of the machine that considers grid disturbances, such as voltage dips and unbalances will be also studied. The second part of the book surveys the most relevant control strategies used for the DFIM when it operates at the wind energy generation application. The control techniques studied, range from standard solutions used by wind turbine manufacturers, to the last developments oriented to improve the behavior of high power wind turbines, as well as control and hardware based solutions to address different faulty scenarios of the grid. In addition, the standalone DFIM generation system will be also analyzed.Preface xiii

1 Introduction to A Wind Energy Generation System 1

1.1 Introduction 1

1.2 Basic Concepts of a Fixed Speed Wind Turbine (FSWT) 2

1.2.1 Basic Wind Turbine Description 2

1.2.2 Power Control of Wind Turbines 5

1.2.3 Wind Turbine Aerodynamics 7

1.2.4 Example of a Commercial Wind Turbine 9

1.3 Variable Speed Wind Turbines (VSWTs) 10

1.3.1 Modeling of Variable Speed Wind Turbine 11

1.3.2 Control of a Variable Speed Wind Turbine 15

1.3.3 Electrical System of a Variable Speed Wind Turbine 22

1.4 Wind Energy Generation System Based on DFIM VSWT 25

1.4.1 Electrical Configuration of a VSWT Based on the DFIM 25

1.4.2 Electrical Configuration of a Wind Farm 33

1.4.3 WEGS Control Structure 34

1.5 Grid Code Requirements 39

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