Power Systems Harmonics: Fundamentals, Analysis and Filter DesignSpringer Science & Business Media, 28/08/2001 - 506 من الصفحات 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. |
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عبارات ومصطلحات مألوفة
45 49 Harmonic 49 Harmonic order 6-pulse admittance in pu capacitance capacitor bank characteristic impedance Current to Current currents and voltages currents are given equivalent Fourier series frequency fundamental fundamental frequency harmonic current spectrum Harmonic distortion results harmonic source harmonic studies I₁ IABC Iconv impedance looking impedance scan Ip₁ Is₁ Is₂ Isı K-factor kV bus matrix form Motor Load MVAr Passive Load phase admittance matrix Phase angle power factor power system presence of harmonics primary and secondary reactance reactive power relates the currents resonance secondary sequence currents sequence admittance matrix short-circuit capacity sin(wt skin effect switched-mode power supply System impedance Table three-phase total harmonic distortion transformer admittance transformer impedance V₁ V₁₁ Vab Vbc VABC vector groups voltage and current Vp₁ Vs₁ Vs₂ waveform Z₁ ΙΑ