dfig control of wecs using indirect matrix converter

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  • DFIG CONTROL OF WIND ENERGY CONVERSION

    SYSTEM USING INDIRECT MATRIX CONVERTER

    A Thesis submitted to

    KIIT UNIVERSITY

    (Declared under section 3 of UGC Act, 1956)

    in fulfillment of the requirement for the award of the degree of Master Of Technology

    in

    Power & Energy System

    By

    Kuldeep Behera

    Roll # 1458015, Registration # 14013532472

    Under the supervision

    of

    Prof. Subrat Behera

    Assistant Professor, School Of Electrical Engineering,

    Campus-3, KIIT University,

    Bhubaneswar, Odisha

    &

    Dr. Manoj Kumar Maharana

    Associate Professor, School Of Electrical Engineering,

    Campus-3, KIIT University,

    Bhubaneswar, Odisha

    SCHOOL OF ELECTRICAL ENGINEERING, KIIT UNIVERSITY,

    BHUBANESWAR 751024, ODISHA, INDIA

  • KALINGA INSTITUTE OF INDUSTRIAL TECHNOLOGY

    KIIT UNIVERSITY, BHUBANESWAR

    ALL RIGHTS RESERVED

  • CERTIFICATE

    This is to certify that the thesis entitled, "DFIG control of wind energy

    conversion system using indirect matrix converter", submitted by Mr.

    Kuldeep Behera, Roll #1458018 and Registration# 14013532472 for the

    award of degree of Master of Technology in Power & Energy System of KIIT

    University, is based on his own original research work under our supervision

    and that neither his thesis nor any part of it has submitted for any degree or any

    other academic award elsewhere.

    Dr. C. K. Panigrahi Dean, Professor

    School of Electrical Engg.

    KIIT University

    Prof. Subrat Behera

    Guide, Asst. Professor

    KIIT University

    Dr. M. K. Maharana

    Co-Guide, Associate Professor

    KIIT University

    External Examiner

  • DECLARATION

    I certify that the work presented in the thesis entitled "DFIG control of wind energy

    conversion system using indirect matrix converter" in fulfilment of the requirement for

    the award of degree of Master Of Technology in Power & Energy System in the School Of

    Electrical Engineering and submitted to KIIT University, Bhubaneswar is an authentic

    record of my own work carried out under the supervision of Prof. Subrat Behera, Assistant

    Professor & Dr. Manoj Kumar Maharana, Associate Professor, School Of Electrical

    Engineering, KIIT University, Bhubaneswar.

    The matter embodied in this thesis has not been submitted by me for the award of any

    other degree of this or any other University / Institute.

    (Kuldeep Behera)

  • Acknowledgement

    It gives me immense pleasure to express my deepest gratitude and sincere thanks to

    my respected guide Prof. Subrat Behera, Asst. Professor, School of Electrical

    Engineering, KIIT University, Bhubaneswar, for giving his valuable guiding encouragement

    and help for this work. His instructive suggestions and careful guidance have helped me to

    solve various technical problems. His continuous support and motivation has helped me to

    face difficulties during this work.

    I am equally indebted to Dr. M. K. Maharana, Associate Professor, School of

    Electrical Engineering, for the valuable information provided by them in their respective

    fields.

    I would like to thank Dr. C. K. Panigrahi, Dean, School of Electrical Engineering

    for giving the opportunity to work with different laboratories in the department on time and

    care.

    I am thankful to Prof. Tapas Roy, Professor and all staff members of the School of

    Electrical Engineering, KIIT University for their cooperation in this work.

    I cordially thank my classmates for giving me a wonderful company throughout my

    stay at KIIT University. I enjoyed every bit of campus life and refreshing moments outside

    my project because of them.

    I would also like to express my sincere thanks to my loving family members for their

    encouragement and providing me all moral support and necessary help whatever I have

    achieved in my life.

    Kuldeep Beher

  • i

    ABSTRACT

    The connection and operation of wind power plants produce some problems that are rising

    partly owing to large changeability of environment conditions, influencing the electrical

    energy supply from these sources. To be possible to study phenomena that are connected

    with wind power plants and impacts of their operation on the operation of distribution and

    transmission systems, it is necessary to do such as in other branches, different computer

    simulations. A grid connected wind power generation scheme using doubly fed induction

    generator is studied. The aim is modelling and simulation of DFIG operating in two

    quadrants (torque-speed) by a suitable control technique to control the rotor current. This

    method will also replace the conventional converter by Indirect Matrix Converter.

    Proposed control of an Indirect Matrix Converter (IMC) is combined with predictive

    rotor current control of a DFIG to achieve a very good dynamic response as the rotor

    currents smoothly, which consists of an input side matrix converter and an output side

    voltage source converter. The proposed method leads to a reduction in the commutation

    losses in the output converter and reduced common mode voltage. For the input converter,

    soft switching commutation is obtained by synchronizing the input and output converter

    pulse width-modulation patterns. Taking a comparison study of all PWM techniques we

    choose the space vector pulse width modulation as the best one because of its low switching

    losses and high harmonic density, power factor & switching frequency. The output voltage,

    output current waveforms, voltage transfer ratio and THD spectrum of switching waveforms

    connected to load are to be analyzed by using MATLAB/ SIMULINK software. Hence

    further the closed loop control of doubly feed induction generator is to be performed for the

    wind energy conversion system connected to grid.

  • ii

    CONTENTS

    Page No.

    Abstract i

    List of Figures v

    List of Tables vii

    Abbreviation

    viii

    CHAPTER 1 : INTRODUCTION

    1.1 Introduction 1

    1.2 Objective 1

    1.3 Scope of work 1

    1.4 Motivation 2

    1.5 Thesis Methodology 2

    1.6 Thesis Outline 2

    1.7 Literature review 3

    1.8 Summary 6

    CHAPTER 2 : SPACE VECTOR MODULATION

    2.1 Space vector modulation 9

    2.2 Modulation scheme in SVM 9

    2.3 SVM of a voltage source inverter 12

    2.4 Conclusion 13

    CHAPTER 3 : MATRIX CONVERTER

    3.1 Matrix converter 14

    3.2 Development of Indirect matrix converter 15

    3.3 Topology of Indirect matrix converter 17

    3.4 Operation of bidirectional switch in matrix converter 18

  • iii

    3.5 Voltage source inverter 19

    3.6 Indirect modulation scheme of matrix converter 20

    3.7 Conclusion 22

    CHAPTER 4 : COMMUTATION SCHEME OF MATRIX CONVERTER

    4.1 Indirect matrix converter 23

    4.2 Commutation scheme of IMC 23

    4.3 DC-link formation of IMC 26

    4.4 Dwell time calculation 30

    4.5 Simulation results and discussion 32

    4.6 Conclusion 36

    CHAPTER 5 : WIND ENERGY CONVERSION SYSTEM

    5.1 Wind energy conversion system 37

    5.2 Types of wind turbines in WECS 39

    5.3 Operating region of wind turbines 39

    5.4 Power of a wind turbine 40

    5.5 Wind power versus speed characteristics 42

    5.6 Turbine design 43

    CHAPTER 6 : DOUBLY-FED INDUCTION GENERATOR

    6.1 Doubly-fed induction generator in WECS 44

    6.2 DFIG equivalent circuit 45

    6.3 DFIG Mathematical Modelling 46

    CHAPTER 7 : VECTOR CONTROL METHOD OF DFIG

    7.1 Vector control method of DFIG 49

    7.2 Theory of vector control phenomena 50

  • iv

    7.3 Direct vector control method 51

    7.4 Indirect vector control method 52

    CHAPTER 8 : MATLAB IMPLEMENTATION OF INDIRECT MATRIX

    CONVERTER WITH DFIG

    8.1 MATLAB implementation of Indirect matrix converter with DFIG 55

    8.2 Simulation results 58

    CHAPTER 9

    Conclusion 65

    References 66

  • v

    LIST OF FIGURES

    Page No.

    Fig. 2.1: Sector division in space vector modulation 9

    Fig. 2.2: Voltage source inverter topology 12

    Fig. 3.1: Classification of AC to AC converters 14

    Fig. 3.2: First topology of Indirect Matrix Converter 15

    Fig. 3.3: Topologies of Direct Matrix Converter 16

    Fig. 3.4: Topology of Indirect Matrix Converter modulation scheme 17

    Fig. 3.5: Four step commutation scheme of a bidirectional switch 18

    Fig. 3.6: Voltage source inverter 21

    Fig. 3.7: Application of voltage and current vectors over Ts 22

    Fig. 3.8: generation of switching signals 22

    Fig. 4.1: Topology of Indirect Matrix Converter 24

    Fig. 4.2: Current flow for positive power flow in one leg of IMC 25

    Fig. 4.3: Current flow for negative power flow in one leg of IMC 25

    Fig. 4.3: Power flow in IMC 26

    Fig.4.4: Behaviour of dc-link volt

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