Expanding the Operational Envelope of Modern Wind Turbine

0,86

MB

Induction Generators

89

stron

5258

ID

University of Strathclyde

2005

rok

Table of Contents

Introduction

Aims 7

Proposed Approach and Organisation of this Thesis 8

Section 1

Wind Energy and the UK Electricity Network 10

Introduction 10

Offshore and Onshore Wind Farms 11

Network Constraints 12

Market System 13

Financial Incentives 14

Section 2

Wind Energy Conversion

Introduction 15

Evolution of the Modern Wind Turbine 15

Wind Resource Evaluation 20

Power in the Wind 22

Aerodynamic conversion 25

Operating Concepts 26

Section 3

Electrical Machine Analysis

Introduction 32

Induction Machines

Rotating Magnetic Field 32

Squirrel Cage Rotor 34

Induction Machine Operation 35

Generator Operation 37

Equivalent Circuit 37

Efficiency 47

Power Factor 48

Induction Machine with Wound Rotor 50

Doubly-Fed Induction Generator 52

Power flow in a D-FIG 54

Real and Reactive Power Control 56

Section 4

Modelling and Simulation in MATLAB Simulink

Introduction 58

MATLAB 58

Simulink 59

Simulink Blocks 60

Inputs and Outputs 67

Squirrel Cage Model 68

Wound rotor with variable Resistance 72

Doubly-Fed Induction Generator 75

Discussion and Comparison 81

Conclusions and Discussion 82

Suggestions for Further work 84

List of Figures 85

References and Bibliography 88