Introduction - Digital Signal Processing in Power System Protection and Control - page 2

protection devices in an appropriate manner. The information provided here can be
useful for protection engineers working at various levels of electric network, in
utilities, as well as for students of electrical engineering, especially electrical
power engineering. It may also be helpful for all others willing to get acquainted
and to apply the filtering, measuring and decision making algorithms for purpose
other than protection and control, everywhere fast and on-line signal analysis is
needed for proper functioning of the apparatus.
This topic starts from a short overview of abnormal states in power systems and
enumeration of principles and criteria for their recognition and elimination
( Chap. 2 ). Next functional development of protection devices and systems is
outlined, with brief description of protection functional blocks and place of pro-
tective relays in broad protection and control systems of power networks ( Chap. 3 ).
Fundamentals of system and signal analysis are provided in Chap. 4 , including all
basic transformations needed in analysis of continuous and discrete systems, which
is meant as a foundation for further more sophisticated algorithms.
The digital algorithms for signal filtering with infinite and finite impulse
response are presented in Chaps. 5 and 6 , respectively, which is followed by
methods and algorithms that can be applied for additional correction or recon-
struction of distorted secondary signals of voltage and current transformers.
Measurement algorithms of most commonly used protection criteria values are
described in Chaps. 8 and 9 , whereas in the latter their dynamics and features in
frequency domain are discussed and some adaptive measurement algorithms are
introduced. Finally, decision making methods with deterministic and statistical
approach as well as multiple criteria and adaptive decision schemes are outlined in
Chap. 10 .
Chapters 11 - 15 are devoted to basic theory and applications of chosen Artificial
Intelligence techniques for protection and control. Fuzzy Logic based schemes,
Artificial Neural Networks, Expert Systems and Genetic Algorithms with their
advantages and drawbacks are presented. In Chap. 15 the techniques mentioned
are compared and their useful combinations (hybrids) are shown that are hoped to
eliminate disadvantages and magnify good features of particular techniques.
Theory provided in the topic is illustrated with lot of computational examples as
well as with examples of the algorithms' application to power system protection.
Special attention is paid to applications of the intelligent approaches and para-
digms that seem to have a great potential for improving operation of protective
devices.
The authors wish respectable readers pleasant reading and a lot of fun by
discovering the beauty of presented mathematical apparatus, signal processing
algorithms, adaptive methods and intelligent techniques!