Original scientific paperRailway traction is a more stochastic heavy load connected system. Due to the usage of ac-dc converters and ac-ac converters, the various power quality issues become the major problems in the electric system. This paper presents a review on power quality conditioners suitable for Railway traction based on the configuration, components involved and on the technical and economic considerations. More than 120 publications are listed in the reference for quick review. Poboljšanje kvalitete snage za željezničke sustave -pregled istraživanja. Željeznički električni sustav je prilično stohastički sustav s velikim opterečenjem. Zbog korištenja AC/DC i AC/AC pretvarača, problemi s kvalitetom isporučene energije predstavljaju glavne probleme električnih sustava. U ovome radu predstavljen je pregled područja vezano uz poboljšanje kvalitete energije za željezničke sustave ovisno o konfiguraciji, komponentama uključenim te o tehničkim i ekonomskim aspektima. Više od 120 radova navedeno je u popisu literature.Ključne riječi: metode za poboljšanje kvalitete energije, kompenzacija haromonika i reaktivne snage, aktivni filtri, šant hibridni filtar, kvaliteta energije
Original scientific paperThis paper analyses the quality of electricity in railway traction. Power quality characteristics have been measured as a case study in a traction sub-station in Tamil Nadu, India, where 1400 KVAR capacitor bank is installed. The actual data has been obtained through direct supply of traction load. Harmonics and various power quality problems are generated through the load of current. The emerging power problems need attention to rectify the "polluting" sites. Issues are measured by providing power quality analyzer and compared with IEEE standards 519-1992. Simulation has been done to improve the power quality issues such as harmonics, power factor and reactive power by using a combination of shunt hybrid filter and Thyrsitor Control Rectifier.Key words: Power quality, Traction load characteristics, Harmonics, Traction station, Total harmonic distortion Kvaliteta snage u željezničkim sustavima i kompenzacija zasnovana na šant hibridnom filtru i tiristorski upravljivom ispravljaču. U radu se analizira kvaliteta električne energije u željezničkim sustavima. Karakteristike kvalitete snage izmjerene su u studiji slučaja na elektrovučnoj podstanici u Tamil Nadu, Indija, gdje je priključen slog kondenzatora snage 1300 KVAR. Stvarni podaci dobiveni su direktnim mjerenjem vučnog opterećenja. Viši harmonici i razni problemi vezani uz kvalitetu snage primijećeni su pri strujnom opterećenju. Spomenuti problemi trebaju dodatnu pozornost kako bi se uklonili. Poteškoće su detektirane korištenjem analizatora kvalitete snage te su usporeene s IEEE standardima 519-1992. Provedene su simulacije za umanjenje poteškoća povezanih s kvalitetom električne energije kao što su viši harmonici, faktor snage i reaktivna snaga pričemu je korištena kombinacija šant hibridnog filtra i tiristorski upravljivog ispravljača.
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