Harmonic Analysis and Improvement for MRT Power Systems

• Main Authors: Wen-chi Chien, 簡文吉
• Other Authors: Jyh-Cherng Gu
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/92202567074147255203

碩士 === 國立臺灣科技大學 === 電機工程系 === 101 === In recent years, the Mass Rapid Transit (MRT) networks expand quickly as public transport demand increase. Meanwhile, the inside of the traction substation and station service substation may include many nonlinear loads such as EMU train and auxiliary service devices. Those facilities also play the role of a harmonic source. If the generated harmonics do not improve properly and inject into power supply system, it may significantly affect the power quality of public utility networks. Furthermore, the parallel resonance may occur and impact the normal operation of MRT. To discover this topic intensively, this thesis set up the harmonic model of power supply systems and it was associated with nonlinear loads, such as transformers, 12-pulse rectifiers in traction substation and air-conditioning, lighting, UPS and traffic signal systems in station service substation by Matlab/Simulink. Besides, the harmonic impact to the operation of the MRT system in peak and off-peak is also discussed. Finally, both the passive and active solutions are proposed and review with benefits comparison.