Power Quality in Power Systems and Electrical Machines By Ewald Fuchs and Mohammad A S Masoum

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Power Quality in Power Systems and Electrical Machines By Ewald Fuchs and Mohammad A S Masoum

Preface

The increased use of power electronic components
within the distribution system and the reliance on
renewable energy sources which have converters as
interface between the source and the power system
lead to power quality problems for the operation of
machines, transformers, capacitors and power
systems. The subject of power quality is very broad
by nature. It covers all aspects of power system engineering
from transmission and distribution level
analyses to end-user problems. Therefore, electric
power quality has become the concern of utilities,
end users, architects and civil engineers as well as
manufacturers. The book is intended for undergraduate
or graduate students in electrical and other engineering
disciplines as well as for professionals in
related fields. It is assumed that the reader has
already completed electrical circuit analysis courses
covering basic concepts such as Ohm’s, Kirchhoff’s,
Ampere’s and Faraday’s laws as well as Norton and
Thevenin equivalent circuits and Fourier analysis. In
addition, knowledge of diodes and transistors and an
introductory course on energy conversion (covering
energy sources, transformers, simple control circuits,
rudimentary power electronics, transformers, singleand
three-phase systems as well as various rotating
machine concepts such as brushless DC machines,
induction and synchronous machines) is desirable.
This book has evolved from the content of courses
given by the authors at the University of Colorado
at Boulder, the Iran University of Science and Technology
at Tehran and the Curtin University of Technology
at Perth, Australia. The book is suitable for
both electrical and non-electrical engineering students
and has been particularly written for students
or practicing engineers who want to teach themselves
through the inclusion of about 150 application
examples with solutions. More than 700 references
are given in this book: mostly journal and conference
papers as well as national and international standards
and guidelines. The International System (SI)
of units has been used throughout with some reference
to the American/English system of units.
Power quality of power systems affects all connected
electrical and electronic equipment, and is a
measure of deviations in voltage, current, frequency,
temperature, force, and torque of particular supply
systems and their components. In recent years there
has been considerable increase in nonlinear loads, in
particular distributed loads such as computers, TV
monitors and lighting. These draw harmonic currents
which have detrimental effects including communication
interference, loss of reliability, increased
operating costs, equipment overheating, machine,
transformer and capacitor failures, and inaccurate
power metering. This subject is pertinent to engineers
involved with power systems, electrical
machines, electronic equipment, computers and
manufacturing equipment. This book helps readers
to understand the causes and effects of power quality
problems such as nonsinusoidal wave shapes, voltage
outages, harmonic losses, origins of single-time
events such as voltage dips, voltage reductions, and
outages, along with techniques to mitigate these
problems. Analytical as well as measuring techniques
are applied to power quality problems as they occur
in existing systems based on central power stations
and distributed generation mainly relying on renewable
energy sources.
It is important for each power engineering student
and professional who is active in the area of distribution
systems and renewable energy that he/she knows
solutions to power quality problems of electrical
machines and power systems: this requires detailed
knowledge of modeling, simulation and measuring
techniques for transformers, machines, capacitors
and power systems, in particular fundamental and
harmonic power flow, relaying, reliability and redundancy,
load shedding and emergency operation,
islanding of power system and its voltage and frequency
control, passive and active filtering methods,
and energy storage combined with renewable energy
sources. An intimate knowledge of guidelines and
standards as well as industry regulations and practices
is indispensable for solving power quality
problems in a cost-effective manner. These aspects
are addressed in this book which can be used either
as a teaching tool or as a reference book.