Electric Power Systems - Fifth Edition

Contents

• Preface to First Edition
• Preface to Fourth Edition
• Preface to Fifth Edition
• Symbols

1. Introduction
2. Basic Concept
3. Components of a Power System
4. Control of Power and Frequency
5. Control of Voltage and Reactive Power
6. Load Flows
7. Fault Analysis
8. System Stability
9. Direct-Current Transmission
10. Overvoltage's and Insulation Requirements
11. Substations and Protection
12. Fundamentals of the Economics of Operation and Planning of Electricity Systems

• Appendix A Synchronous Machine Reactances
• Appendix B Typical Transformer Impedances
• Appendix C Typical Overhead Line Parameters
• Further Reading
• Index

Preface to First Edition

In writing this book the author has been primarily concerned with the presentation of the basic essentials of power-system operation and analysis to students in the final year of first degree courses at universities and colleges of technology. The emphasis is on the consideration of the system as a whole rather than on the engineering details of its constituents, and the treatment presented is aimed at practical conditions and situations rather than theoretical nicety. In recent years the contents of many undergraduate courses in electrical engineering have become more fundamental in nature with greater emphasis on electromagnetism, network analysis, and control theory. 

Students with this background will be familiar with much of the work on network theory and the inductance, capacitance, and resistance of lines and cables, which has in the past occupied large parts of textbooks on power supply. In this book these matters have been largely omitted, resulting in what is hoped is a concise account of the operation and analysis of electric power systems. It is the author’s intention to present the power system as a system of interconnected elements which may be represented by models, either mathematically or by equivalent electrical circuits. The simplest models will be used consistently with acceptable accuracy and it is hoped that this will result in the wood being seen as well as the trees. 

In an introductory text such as this no apology is made for the absence of sophisticated models of plant (synchronous machines in particular) and involved mathematical treatments as these are well catered for in more advanced texts to which reference is made. The book is divided into four main parts, as follows: 

a. Introduction, including the establishment of equivalent circuits of the components of the system, the performance of which, when interconnected, forms the main theme. 

b. Operation, the manner in which the system is operated and controlled to give secure and economic power supplies. 

c. Analysis, the calculation of voltage, power, and reactive power in the system under normal and abnormal conditions. The use of computers is emphasised when dealing with large networks.
d. Limitations of transmittable power owing to the stability of the synchronous machine, voltage stability of loads, and the temperature rises of plant. It is hoped that the final chapter will form a useful introduction to direct current transmission which promises to play a more and more important role in electricity supply. 

The author would like to express his thanks to colleagues and friends for their helpful criticism and advice. To Mr J.P. Perkins for reading the complete draft, to Mr B.A. Carre on digital methods for load flow analysis, and to Mr A.M. Parker on direct current transmission. Finally, thanks are due to past students who for over several years have freely expressed their difficulties in this subject.

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