近年來國內捷運營運路線迅速擴張，其中供給捷運電聯車用電之設備如變頻器、整流器與空調系統等皆屬非線性負載。當電聯車運行時所產生之諧波電流將直接注入供電系統，導致供電系統電壓波形嚴重畸變及設備過電壓等，甚至發生諧波共振而造成設備燒損，而影響大眾捷運之正常運行，故捷運供電系統之電力品質尤為重要議題。
本研究藉由功能強大的Matlab/Simulink分析工具，建立捷運供電系統相關諧波模型，包括電力變壓器、12脈衝整流器、車站負載與牽引負載等，並分別探討捷運供電系統於尖峰與離峰時段之諧波產生之影響。此外，本文同時提出主動式與被動式濾波器等補償改善方案，並探討改善前後之效益。

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.

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