Comparative Performance Analysis of Thyristor and IGBT Based Induction Motor Soft Starters

Table of Contents

Chapter 1

INTRODUCTION

1.1 Project background

1.2 Literature review

Objectives

Methodology

Chapter 2

THEORETICAL BACKGROUND

2.1 Induction motor

2.1.1 Operating Principle

2.2 Starting of Induction motor

2.2.1 Direct-on-Line Starter

2.2.2 Star Delta Starter

2.2.3 Auto Transformer Starting Method

2.2.4 Rotor Resistance Starter

2.2.5 Solid State starting

2.3 Soft starters

2.4 Power electronics devices

2.4.1 Thyristor

2.4.2 Insulated Gate Bipolar Transistor (IGBT)

2.5 AC Voltage Controllers (AC Regulator)

2.5.1 Phase Control of Thyristor

2.6 Soft Starter with R-L Load

2.7 Performance parameter

2.8 Three Phase Soft Starter

2.9 Firing Circuits

2.9.1 Using ramp signal

2.9.2 Using cosine control:

2.10 Matlab/Simulink Basics

2.10.1 Matlab

2.10.2 Simulink

2.10.3 Lists of Blocks Used

2.10.4 Thyristor Characteristics

2.10.5 IGBT Characterisics

Chapter 3

SIMULATION STUDY

3.1 Thyristor with R-L load

3.2 Simulink model of IGBT with RL load

3.3 Comparative Performance

3.4 Simulink Model of Three Phase Induction Motor with Thyristor

CONCLUSION AND RECOMMENDATION

FUTURE IMPROVEMENT

REFERENCES

Project Goals and Thematic Focus

This project evaluates and compares the performance of Thyristor-based and IGBT-based soft starters for induction motors, specifically focusing on the dynamics during startup. The primary goal is to analyze the influence of system parameters on Total Harmonic Distortion (THD) and power factor under varying firing angles through simulation models developed in MATLAB/Simulink.

• Comparative analysis of Thyristor and IGBT soft starter performance.
• Evaluation of Total Harmonic Distortion (THD) and power factor in induction motor drives.
• Development of flexible MATLAB/Simulink simulation models for soft starters.
• Investigation of firing angle impacts on voltage and current profiles.
• Study of soft starter impact on reducing mechanical and electrical starting stress.

Excerpt from the Book

Summary of Chapters

Chapter 1: This chapter provides an overview of induction motor applications, the disadvantages of direct online starting, and the necessity of using soft starters to reduce starting currents and mechanical stress.

Chapter 2: This chapter establishes the theoretical framework, covering induction motor operation, various conventional and solid-state starting methods, and detailed descriptions of power electronics devices like Thyristors and IGBTs used in soft starters.

Chapter 3: This chapter presents the simulation study, detailing the modeling of soft starters for R-L loads and three-phase induction motors using MATLAB/Simulink, including comparative performance analysis regarding THD and power factor.

Keywords

Soft starter, Induction motor, Thyristor, IGBT, Total Harmonic Distortion, THD, Power Factor, MATLAB, Simulink, Phase control, Firing angle, Inrush current, Voltage regulator, Power electronics, Electrical drives

Frequently Asked Questions

What is the core focus of this research?

The work focuses on performing a comparative analysis of Thyristor and IGBT-based soft starters for induction motors to determine their efficiency in controlling starting transients.

What are the primary themes covered in this project?

The main themes include power electronics, induction motor dynamics, soft starting techniques, harmonic distortion analysis, and simulation-based performance modeling.

What is the central research objective?

The objective is to analyze and compare the performance of Thyristor and IGBT soft starters, specifically evaluating their impact on Total Harmonic Distortion (THD) and power factor.

Which methodology is utilized for the investigation?

The research employs a theoretical study of power electronics and induction motor drives, followed by the development, implementation, and analysis of firing circuits using MATLAB/Simulink.

What topics are discussed in the main section of the document?

The main section covers the theory of induction motors, soft starter configurations, operation of Thyristors and IGBTs, firing circuit design, and comprehensive simulation results for R-L loads and three-phase motors.

Which keywords best describe this study?

Key terms include soft starter, induction motor, Thyristor, IGBT, THD, power factor, MATLAB, and Simulink.

Why are IGBTs considered as an alternative to Thyristors in soft starters?

IGBTs are used because they are fast switching devices, which helps in addressing the low-frequency switching limitations associated with traditional Thyristors.

What does the simulation of the three-phase soft starter demonstrate?

The simulation demonstrates the use of a synchronized 6-pulse generator to control an induction motor load and shows the resulting phase currents and voltages at specific firing angles.