本論文擬針對整體捷運路網之供電系統做深入之分析及探討，以推導目標年(2021)最佳的規劃策略及運轉模式，有效提昇供電設備的運轉效能，減少不必要的營運電費支出，另外就是探討逐年變壓器設置數量的合理性，以避免設計過當造成額外的支出。論文首先介紹捷運供電系統的架構，並說明其功能與設計理念，然後進行供電系統之模擬分析。由於捷運系統的負載與一般用戶不同，可分為靜態的車站負載與隨列車運轉之動態負載。車站負載較為固定且容易估測，但電聯車負載隨著路網特性與班距的不同而有所變化，因此本文首先針對電聯車負載以直流負載分析軟體(Energy Management Model, EMM）進行模擬，探討第三軌之電壓是否符合電聯車正常運轉所允許的變動範圍內，並分析各牽引動力變電站之負載量是否於整流變壓器的額定容量內。在完成直流負載分析後，將牽引動力負載配合車站負載及電力系統架構，以交流負載分析軟體進行動態模擬，由於捷運系統主變電站之變壓器容量的設計標準，不僅須能滿足捷運營運目標年尖峰時段的負載量，也必須能提供100%的後衛能力，因此變壓器長時間在低負載利用率狀況下運轉，變壓
器的鐵損將導致電費成本增加。

本文以台北捷運路網目標年的營運狀況為模擬對象，在符合捷運系統的設計標準條件下，改變主變電站之變壓器的運轉組合及重組捷運路網供電系統的架構，以提升變壓器的負載利用率，減少變壓器的銅損及鐵損，提高捷運系統營運效率。建議捷運目標年營運尖峰、離峰時段的最佳規劃及運轉策略。因目標年所模擬出之負載量不及捷運局所規劃變壓器容量的一半，在容量上似乎過度考量，建議變壓器數量需作適度的修正，首先模擬逐年負載的成長率，計算出逐年各種可行的變壓器容量組合，依主變壓器投資成本與折舊率及可靠度成本將各狀態之成本算出，在滿足捷運系統逐年的負載量與考慮可靠度的等效成本之條件下進行逐年動態方程式分析，使用最佳動態規劃法尋找出逐年最低成本之路徑，所推導之主變壓器最佳容量規劃可作為捷運局遠期路網規劃之參考，有效降低主變壓器之投資成本與改善營運效率。

This thesis is to investigate the power system operation strategy for an electrified mass rapid transit（MRT）network with the load transfer among main transformers by considering load growth and due to annual ridership increase, the loading factors of main transformers are improved so that the power system loss can be reduced. For the conventional planning of an electrified MRT system to serve the public transportation for the metropolitan area, the transformer capacity is often designed to meet the criterion of not only covering the peak demand but also providing the 100% fully capacity reserve for the system operation of target year. With such a high backup capability, the transformers are very lightly loaded for most of the operation time and significant core loss will be introduced over the lifecycle.
In this thesis the train motion equation has been applied to find the mechanical power required, the proper strategy of unit commitment of main transformers and network reconfiguration by switching operation has been considered to enhance the operation efficiency of an MRT power system. To demonstrate the effectiveness of the proposed methodology, the Taipei MRT network is selected for computer simulation. It is found that the loading factors of main transformers can be improved dramatically and the load balance among the transformers can be obtained by the proper switching operation. An efficient strategy for transformer planning by taking into account the growth rate of load so that the overall investment cost of main transformers can be justified. The load characteristics and load growth rate of mass rapid transit（MRT）are derived by an Energy Management Model (EMM) and the AC load flow analysis is used to solve the transformer copper loss and core loss over the study period. To obtain optimal planning and operation strategy of main transformers for the MRT power system, the transformers initial investment cost and depreciation cost, peak power loss and energy loss, and reliability cost of distribution transformers are combined to form the overall cost function .By performing the dynamic programming (DP) the unit commitment of main transformers by considering the annual peak and off peak power loading of whole MRT system is derived. It is found that more efficient system operation can be obtained by the proposed methodology.

第一章 緒論
第二章 捷運供電系統
第三章 直流負載潮流分析
第四章 台北捷運最佳轉供路網之交流分析
第五章 台北捷運路網動態規劃
第六章 結論

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