Določanje napetostne harmonske popačitve porabnika

ŠPELKO, ALJAŽ (author), Papič, Igor (mentor)

Moje magistrsko delo obravnava vzroke, ki vplivajo na harmonsko popačenje na merilno predajnem mestu. Na začetku naloge je opis vzorčnega modela za analizo harmonskih popačenj in njegovih elementov. Nato so navedeni trije različni obratovalni primeri z rezultati. Rezultate sem analiziral s FFT. Za tem sem opravil frekvenčno skeniranje, ki sem ga v nalogi podrobneje opisal. Na merilno predajnem mestu sem pri skeniranju izračun ločil na porabniški in omrežni del. Skeniranje sem izvedel na dva načina, z upoštevanjem in brez upoštevanja tiristorskega usmernika. Ko sem pridobil frekvenčne impedance sem analizirane meritve lahko ločil na omrežni in porabniški harmonski prispevek. V magistrskem delu sem opisal tudi tri metode, s katerimi sem si pomagal pri pridobivanju frekvenčnih karakteristik in določanju prispevkov k skupnem harmonskem popačenju. Prvi dve opisani metodi sem uporabil za določanje frekvenčne karakteristike. Pri prvi metodi je uporabljen blok programa, vendar ta blok pri izračunu ne upošteva tiristorskih usmernikov. Zaradi tega sem za določanje frekvenčne karakteristike uporabil še drugo metodo, ki mi je pri izračunu omogočila upoštevanje tiristorskega usmernika. Obe metodi sem tudi primerjal med seboj. Za določanje prispevka sem prav tako uporabil tri različne metode. Prva metoda je harmonska vektorska metoda, ki na podlagi omrežne in porabniške impedance določi prispevek porabnika na merilno predajnem mestu. Druga metoda se ukvarja s tem, kakšno je bilo harmonsko popačenje pred in po priključitvi porabnika. Tretja metoda je enaka drugi, vendar uporablja referenčne impedance. Razlika harmonskih popačenj pred in po priključitvi porabnika je prispevek porabnika k skupnemu popačenju. V zaključku sem komentiral in obrazložil dobljene rezultate. Rezultati so potrdili moja predhodna pričakovanja.

• Language: Slovenian
• Keywords: harmonska analiza, frekvenčno skeniranje, metoda harmonskih vektorjev, IEC metoda, odgovornost za harmonsko popačenje
• Work type: Master's thesis/paper
• Organization: FE - Faculty of Electrical Engineering
• Year: 2016
• PID: 20.500.12556/RUL-85190
• Publication date in RUL: 14.09.2016

Secondary language

• Language: English
• Title: Determination of customer voltage harmonic distortion

Abstract

My Master's thesis deals with the causes that affect the harmonic distortion at the point of common coupling. At the beginning of the thesis is a description of the model and its elements. Then, there are three different operating situations with the results. The results were analyzed with FFT. Then I made frequency scanning, which I have described in more detail. The scanning has been done in two different ways, with and without considering the thyristor rectifier. When I acquired impedance, I was able to separate measurements in two parts, on the network and on the consumer contribution. In this master thesis I have described three methods which I have used to get the frequency characteristics and determination of the contribution to the overall harmonic distortion. The first two methods I used for the determination of the frequency characteristics. The first method uses program block, but this block in the calculation does not take into account the thyristor rectifier. For this reason, I have used another method for determining the frequency characteristics, which enabled me in the calculation consideration of thyristor rectifier. I have also compared both methods with each other. For the determination of the contribution I also used three different methods. The first method is a harmonic vector method based on a network and customer input impedance determined at the point of common coupling. Another method deals with what was harmonic distortion before and after connecting to the consumer. The difference in harmonic distortion before and after connecting the consumer is the consumer’s contribution to the overall distortion. The third method is the same as the second, but it is based on reference impedances. In conclusion, I commented and explained the obtained results. The results confirmed my previous expectations.

• Keywords: harmonic analysis, frequency scan, harmonic vector method, IEC method, responsibility for harmonic distortion