Author: Li, Kang-kuen
Title: Harmonics studies in 25KV traction power supply system of KCR
Degree: M.Sc.
Year: 1994
Subject: Electric railway motors
Harmonics (Electric waves)
Traction-engines
Hong Kong Polytechnic -- Dissertations
Department: Department of Electrical Engineering
Pages: 50 leaves : ill. ; 30 cm
Language: English
Abstract: The Traction Power Supply of Kowloon-Canton Railway (KCR) is the 25kV single phase 50 Hz. overhead catenary current collection system which is supplied by China Light & Power at two 132/25kV feeder stations (Tai Wai and Fanling). During the past ten years, harmonic contents in the traction loading had increased substantially as a result of growth in operation and the introduction of thyristor controlled rolling stock. This project had identified and analysed potential problems arising from the increase in harmonic contents which include nuisance tripping and exceedance of allowable harmonic distortion of voltage at point of common coupling. A harmonic load flow programme had been developed to simulate harmonics power flow in the traction power supply system under different traffic operation modes, different combination of rolling stocks and a variety of harmonic filter equipment arrangement. The sensitivity of protective relays to increased harmonic contents in the operating voltage and current had also been tested. Based on the simulation results of the harmonic load flow programme and testing results of the protective relays, the impact of growth in harmonic contents in future had been predicted. The project had also surveyed possible means of reducing harmonic contents using train borne equipment (Compensator and double series bridge) track side equipment (increasing filter capacity, multi-leg filters, relocation of filters and returning of filters) and made recommendations for future actions.
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