[Voltage Control on Wind power using Fuzzy Logic Control]

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Acknowledgement

I would take this opportunity to thank my research supervisor, family and friends for their support and guidance without which this research would not have been possible.

DECLARATION

I, [type your full first names and surname here], declare that the contents of this dissertation/thesis represent my own unaided work, and that the dissertation/thesis has not previously been submitted for academic examination towards any qualification. Furthermore, it represents my own opinions and not necessarily those of the University.

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Abstract

This paper investigates fuzzy logic control of DFIG wind turbine. For this purpose a user defined block is used therefore both PSCAD/EMTDC and MATLAB softwares work simultaneously. All parameters and structures such as study system, wind turbine and control unit are described in details. To prove the performance of controller unit, different abnormal situations are exerted. Closer fault location to the wind turbine causes more severe situation and a three line to ground short circuit fault near the wind turbine as the worst case is studied in which voltage decreases until about zero and rotor current exceeds its limit . Excellent performance of fuzzy logic controller using on-line tuning of parameters based on any situation maintains stability and improves power quality of wind turbine

Table of Contents

Introduction7

Wind Energy10

Classification24

Features Of Doubly Fed Machines24

Electronic Control32

Wound-rotor doubly fed electric machine34

Construction34

Control35

Efficiency36

Power Density37

Cost38

Double Fed Induction Generator38

Brushless Doubly Fed Versions41

Brushless Wound-Rotor Doubly Fed Electric Machine43

Modeling of Wind Turbine Control System46

Fuzzy Logic Speed Controller4

Simulation Results12

Vector Controlled Doubly Fed Induction Generator16

GRID PWM Converter And Controls21

Tests26

Current Ref. PWM (CRPWM)27

Conclusion30

References31

Introduction

Increasing environmental concern during the 20th Century has moved the research focus form conventional electricity sources to renewable and alternative energy solutions. A number of renewable power generation sources exist, such as wind energy, solar energy, wave energy, hydro power and more sophisticated systems based on hydrogen. In renewable power generation, wind energy has been noted as the fastest-growing energy technology in the world. This is due to the fact that world has enormous resources of wind energy. It has been estimated that tapping barely 10% of the wind energy available could supply all the electricity needs of the world. Moreover, recent technological advances in variable-speed wind turbines, power electronics, drives, and controls have made wind energy competitive with conventional coal and natural gas power.

One of the problems of wind energy is that its availability is sporadic, and therefore it needs to be backed by other power sources, in order to avoid instability of the power system. Due to this, wind turbines are used as additional electrical energy sources among already installed conventional sources.

In the early years of the development, fixed speed wind turbines were the most installed wind turbines. They are equipped with an induction generator connected directly to the grid without converter. With this configuration it is not possible to extract all available wind energy. Power electronics makes it possible to apply the variable speed concept. By introducing variable speed operation, it is possible to continuously adapt the rotational speed of the wind turbine ...