Power Systems Harmonics

The industry's widespread application of variable speed drives in the recent years accompanied by the electric utility's increasing use of capacitor banks have set the basis for paying considerable attention to the quality of electric power and seriously addressing the issue of current and voltage distortion, a major form of which is harmonic distortion. Harmonic studies are aimed at computing bus harmonic voltages, branch harmonic currents, and voltage and current total harmonic distortion (THD), as well as detecting resonance conditions. It is thus of great importance, when conducting harmonic studies, that system components are correctly mod elled to ensure accurate and reliable harmonic distortion results. Commercial programs are available for the analysis of harmonic problems. International standards are further being developed to assess harmonic distortion. Chapter 2 of this text provides some preliminaries. Characteristics of harmonics and measures of harmonic distortion are illustrated. The use of capacitor banks for reactive power supply and power factor correction is dis cussed. Resonance is explained. Origins of harmonic distortion are dealt with in Chapter 3. Chapter 4 is aimed at quantifying the effects of harmonic dis tortion on power system equipment and loads. Chapter 5 is devoted to the methods of reduction of power system harmonics. Limits of allowable voltage and current harmonic distortion set by IEEE, IEC, EN and NORSOK stan dards are presented in Chapter 6.

Very informative, simple and easy to read and follow Concentration is on the practical aspects Contains practical case studies that are analysed providing the results and commenting on the outcome Contains a large number of problems Detailed solutions are provided Perspectives based on real-life work experience are given Includes supplementary material: sn.pub/extras Request lecturer material: sn.pub/lecturer-material

Texte du rabat
The electric utility's increasing use of power factor correction capacitor banks and the industry's widespread application of power-electronic converters have set the basis for, recently, paying considerable attention to the issue of power system harmonics. Aiming at a better understanding of power system harmonics, this text presents a discussion of this issue, providing a quantitative analysis when possible. Pertinent equations are developed. 80 practical case studies based on real-life work experience come with the text. These are analysed providing the results and commenting on the output. Furthermore, 80 end-of-chapter problems are provided. A detailed solution manual is available. The book can be used as a textbook for undergraduate and graduate students, in short-courses offered by consultants and institutes, as well as a tutorial, reference, or self-study course for practising engineers in the industry and electric utility.

Contenu

1. Introduction.- 2. Fundamentals of Harmonics.- 3. Harmonics in Power Systems Their Causes.- 4. Effects of Harmonic Distortion on Power Systems.- 5. Mitigation of Power System Harmonics.- 6. Limits of Harmonic Distortion.- 7. Harmonic Studies Modelling of System Components.- 8. Transformer Modelling.- 9. Modelling of Transmission Lines / Cables.- 10. Power System Harmonic Studies A Simple Approach.- Appendices.- A. A Review of Transformation and Symmetrical Components.- A.2 Symmetrical Components.- B. Phase and Sequence Admittance Matrices for Three-Phase Transformers.- B.2.1 Yd1 Transformers.- B.2.2 Yd3 Transformers.- B.2.3 Yd5 Transformers.- B.2.4 Yd7 Transformers.- B.2.5 Yd9 Transformers.- B.2.6 Yd11 Transformers.- B.4.1 Dyl Transformers.- B.8 YY Transformers.- B.8.1 Yy0 Transformers.- B.8.2 Yy2 Transformers.- B.8.3 Yy4 Transformers.- B.8.4 Yy6 Transformers.- B.8.5 Yy8 Transformers.- B.8.6 Yy10 Transformers.- B.9.1 Dd0 Transformers.- B.9.2 Dd2 Transformers.- B.9.3 Dd4 Transformers.- B.9.4 Dd6 Transformers.- B.9.5 Dd8 Transformers.- B.9.6 Dd10 Transformers.- B.10 Summary.- C. Transmission Matrices for Three-Phase Transformers.- C.1.1.1 Yd1 Transformers.- C.1.1.2 Yd3 Transformers.- C.1.1.3 Yd5 Transformers.- C.1.1.4 Yd7 Transformers.- C.1.1.5 Yd9 Transformers.- C.1.1.6 Yd11 Transformers.- C.1.2.1 Dy1 Transformers.- C.1.2.2 Dy3 Transformers.- C.1.2.3 Dy5 Transformers.- C.1.2.4 Dy7 Transformers.- C.1.2.5 Dy9 Transformers.- C.1.2.6 Dy11 Transformers.- C.1.3 Summary.- C.2.1 Yy0 and Dd0 Transformers.- C.2.2 Yy2 and Dd2 Transformers.- C.2.3 Yy4 and Dd4 Transformers.- C.2.4 Yy6 and Dd6 Dz6 Transformers.- C.2.5 Yy8 and Dd8 Dz8 Transformers.- C.2.6 Yy10 and Dd10 Transformers.- C.2.7 Summary.