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Introduction To Modern Power Electronics: Dr. U. T. Shami

This document provides an introduction and overview of the textbook "Introduction to Modern Power Electronics" by Andrzej M. Trzynadlowski. It discusses the contents of Chapter 1 which covers the basics of power electronics including definitions of power electronics and generic power converters. Chapter 1 also discusses waveform components such as total harmonic distortion and distortion factor. It explains different methods of phase control including resistive phase control as well as phase control using electronics for both DC and AC applications. Pulse width modulation is also introduced. The document provides figures and equations to support the explanations of these fundamental power electronics concepts.

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Arfan Shahzad
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77 views35 pages

Introduction To Modern Power Electronics: Dr. U. T. Shami

This document provides an introduction and overview of the textbook "Introduction to Modern Power Electronics" by Andrzej M. Trzynadlowski. It discusses the contents of Chapter 1 which covers the basics of power electronics including definitions of power electronics and generic power converters. Chapter 1 also discusses waveform components such as total harmonic distortion and distortion factor. It explains different methods of phase control including resistive phase control as well as phase control using electronics for both DC and AC applications. Pulse width modulation is also introduced. The document provides figures and equations to support the explanations of these fundamental power electronics concepts.

Uploaded by

Arfan Shahzad
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Introduction to

Modern Power
Electronics
Chap.-1
Introduction

Dr. U. T. Shami
Introduction to the Text Book

Title:
Introduction to Modern
Power Electronics

Author:
Andrzej M. Trzynadlowski

Third Edition.
Publisher: Wiley

The Front View of Our Text Book


1.1 What is Power Electronics
1.1 What is Power Electronics
1.2 Generic Power Converter
1.2 Generic Power Converter

Normally a Free-Wheeling Diode


1.2 Generic Power Converter
1.2 Generic Power Converter
1.2 Generic Power Converter (Inverter)
1.3 Waveform components and figures of merit
Total harmonic distortion or THD
This is the measure of closeness in shape between a
waveform and its fundamental component.

1
THD  (  V on2 ) 1 / 2
V o1 n  2,3,...

THD is the summation of all harmonic components of


the voltage or current waveform compared against the
fundamental component of the voltage or current
wave:
Distortion Factor

 THD gives the total harmonic content, but it


does not indicate the level of each harmonic
component.

 If a filter is used at the output of inverters, the


higher order harmonics are attenuated more
effectively.
Distortion Factor
 The distortion factor indicates the amount of
harmonic distortion that remains in a
particular waveform after the harmonics being
subjected to a second-order attenuation
(divided by n2).

 Therefore, DF is a measure of effectiveness in


reducing unwanted harmonics without having
to specify the values of the load filter.

1 V on 2 1 / 2
DF  [  ( 2) ]
V o1 n  2,3,... n
1.4 Phase Control
A Resistive Phase Controller will control the output voltage
magnitude either ac or dc without using a transformer.
A Resistive Phase Controller also called Resistive controller,
changes the output value according the value of the resistor.
The magnitude control ration M is defined as

The resistive control method should not be used in high-power


applications.
WHY ?? Answer 1 of 2
WHY ?? Answer 2 of 2
Phase Control by Electronics: DC
Phase Control by Electronics: DC
Phase Control by Electronics: DC
Phase Control by Electronics: AC
Phase Control by Electronics: AC
Phase Control by Electronics: AC
Phase Control by Electronics: AC
Pulse Width Modulation
1.6 Calculation of Current Waveforms
1.6 Calculation of Current Waveforms
1.6 Calculation of Current Waveforms
Basics of Electronics: The Course Out-line
Basics of Electronics: The Course Out-line

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