SPEED CONTROL OF THREE-PHASE INDUCTION MOTOR USING VARIABLE FREQUENCY DRIVE


SPEED CONTROL OF THREE-PHASE INDUCTION MOTOR USING VARIABLE FREQUENCY DRIVE

ABSTRACT:          

There are various methods for speed control of induction motors. This paper specifically describes one of the methods: speed control using variable frequency. The proposed system is a MATLAB Simulink model, which is a closed loop model designed to achieve desired speed control of a three-phase induction motor by varying its frequency. The Simulink model has four main blocks, namely the inverter, synchronous machine, proportional integral control and current hysteresis control. For accuracy of output results and simplicity, we have used dq to abc transformation block and sin function block. The inverter is comprised of six insulated-gate bipolar transistors (IGBTs), which are fired by gate pulses generated by current hysteresis control block. The inverter generates variable frequency and variable voltage output, which is given to motor terminals. The project presents the working principle of variable frequency drive (VFD), its performance, and the use of Pulse Width Modulation (PWM) in a three-phase inverter to control the frequency and thus the speed. The proposed method conformed to performance predictions and delivered the desired outputs.

TABLE OF CONTENTS

ABSTRACT    ii

ACKNOWLEDGMENTS    iii

LIST OF FIGURES    v

LIST OF ABBREVIATIONS    vi

1.    INTRODUCTION    1

2.    BACKGROUND AND BASIC UNDERSTANDING    2

3.    VARIABLE FREQUENCY DRIVE OPERATING PRINCIPLE    8

4.    COMPONENTS OF PROJECT MODEL    12

5.    BLOCK DIAGRAM AND OUTPUT    19

6.    CONCLUSION AND FUTURE WORK    23

REFERENCES    24

LIST OF FIGURES

1.    Motor speed-torque chart    5

2.    Basic block diagram of VFD    10

3.    Hysteresis control block    17

4.    Simulink model of VFD    21

5.    Graph of desired speed    22

LIST OF ABBREVIATIONS

µA    micro-Ampere

mA    milli -Ampere

µV    micro-Volt

mV    milli-Volt

AC    Alternating Current

BJT    Bipolar Junction Transistor

CSI    Current Source Inverter

DC    Direct Current

DTC    Direct Torque Control

EMF    Electro Motive Force

HP    Horse Power

IGBT    Insulated Gate Bipolar Transistor

KW    Kilo Watt

KV    Kilo Volt

kHz    kilo Hertz

LCI    Load Commutated Inverter

LV    Low Voltage

MOSFET    Metal-Oxide Semiconductor Field Effect Transistor

MOSIGT    Metal Oxide Semiconductor Insulated Gate Transistor

MV    Medium Voltage

MW    Mega Watt

PI    Proportional Integral

PWM    Pulse Width Modulation

SVPWM    Space Vector Pulse Width Modulation

V/Hz    Volts per Hertz

VFD    Variable Frequency Drive

VSI    Voltage Source Inverter

CHAPTER ONE:      INTRODUCTION  -        

A variable-frequency drive (VFD) is a type of adjustable speed drive used in electro- mechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage. VFDs are used in applications ranging from small appliances to the largest of mine mill drives and compressors. Over the last four decades, power electronics technology has reduced VFD cost and size and improved performance through advances in semiconductor switching devices, drive topologies, simulation, and control techniques, and control hardware and software. VFDs are available in several different low and medium

voltage AC-AC and DC-AC topologies. Variable speed drives are used for two main reasons: to improve the efficiency of motor-driven equipment by matching speed with the changing load requirements and to allow accurate and continuous process control over a wide range of speeds. This project specifically puts emphasis on one of the various methods of speed control of induction motor that is by changing frequency. The simulation of this VFD consists of four main units namely inverter, induction motor, PI (Proportional Integral) controller and hysteresis controller. In this project model, pulse width modulation technique is used to generate variable frequency.

.

SPEED CONTROL OF THREE-PHASE INDUCTION MOTOR USING VARIABLE FREQUENCY DRIVE



TYPE IN YOUR TOPIC AND CLICK SEARCH.






RESEARCHWAP.NET

Researchwap.net is an online repository for free project topics and research materials, articles and custom writing of research works. We’re an online resource centre that provides a vast database for students to access numerous research project topics and materials. Researchwap.net guides and assist Postgraduate, Undergraduate and Final Year Students with well researched and quality project topics, topic ideas, research guides and project materials. We’re reliable and trustworthy, and we really understand what is called “time factor”, that is why we’ve simplified the process so that students can get their research projects ready on time. Our platform provides more educational services, such as hiring a writer, research analysis, and software for computer science research and we also seriously adhere to a timely delivery.

TESTIMONIES FROM OUR CLIENTS


Please feel free to carefully review some written and captured responses from our satisfied clients.

  • "Exceptionally outstanding. Highly recommend for all who wish to have effective and excellent project defence. Easily Accessable, Affordable, Effective and effective."

    Debby Henry George, Massachusetts Institute of Technology (MIT), Cambridge, USA.
  • "I saw this website on facebook page and I did not even bother since I was in a hurry to complete my project. But I am totally amazed that when I visited the website and saw the topic I was looking for and I decided to give a try and now I have received it within an hour after ordering the material. Am grateful guys!"

    Hilary Yusuf, United States International University Africa, Nairobi, Kenya.
  • "Researchwap.net is a website I recommend to all student and researchers within and outside the country. The web owners are doing great job and I appreciate them for that. Once again, thank you very much "researchwap.net" and God bless you and your business! ."

    Debby Henry George, Massachusetts Institute of Technology (MIT), Cambridge, USA.
  • "Great User Experience, Nice flows and Superb functionalities.The app is indeed a great tech innovation for greasing the wheels of final year, research and other pedagogical related project works. A trial would definitely convince you."

    Lamilare Valentine, Kwame Nkrumah University, Kumasi, Ghana.
  • "I love what you guys are doing, your material guided me well through my research. Thank you for helping me achieve academic success."

    Sampson, University of Nigeria, Nsukka.
  • "researchwap.com is God-sent! I got good grades in my seminar and project with the help of your service, thank you soooooo much."

    Cynthia, Akwa Ibom State University .
  • "Sorry, it was in my spam folder all along, I should have looked it up properly first. Please keep up the good work, your team is quite commited. Am grateful...I will certainly refer my friends too."

    Elizabeth, Obafemi Awolowo University
  • "Am happy the defense went well, thanks to your articles. I may not be able to express how grateful I am for all your assistance, but on my honour, I owe you guys a good number of referrals. Thank you once again."

    Ali Olanrewaju, Lagos State University.
  • "My Dear Researchwap, initially I never believed one can actually do honest business transactions with Nigerians online until i stumbled into your website. You have broken a new legacy of record as far as am concerned. Keep up the good work!"

    Willie Ekereobong, University of Port Harcourt.
  • "WOW, SO IT'S TRUE??!! I can't believe I got this quality work for just 3k...I thought it was scam ooo. I wouldn't mind if it goes for over 5k, its worth it. Thank you!"

    Theressa, Igbinedion University.
  • "I did not see my project topic on your website so I decided to call your customer care number, the attention I got was epic! I got help from the beginning to the end of my project in just 3 days, they even taught me how to defend my project and I got a 'B' at the end. Thank you so much researchwap.com, infact, I owe my graduating well today to you guys...."

    Joseph, Abia state Polytechnic.
  • "My friend told me about ResearchWap website, I doubted her until I saw her receive her full project in less than 15 miniutes, I tried mine too and got it same, right now, am telling everyone in my school about researchwap.com, no one has to suffer any more writing their project. Thank you for making life easy for me and my fellow students... Keep up the good work"

    Christiana, Landmark University .
  • "I wish I knew you guys when I wrote my first degree project, it took so much time and effort then. Now, with just a click of a button, I got my complete project in less than 15 minutes. You guys are too amazing!."

    Musa, Federal University of Technology Minna
  • "I was scared at first when I saw your website but I decided to risk my last 3k and surprisingly I got my complete project in my email box instantly. This is so nice!!!."

    Ali Obafemi, Ibrahim Badamasi Babangida University, Niger State.
  • To contribute to our success story, send us a feedback or please kindly call 2348037664978.
    Then your comment and contact will be published here also with your consent.

    Thank you for choosing researchwap.com.