臺灣博碩士論文加值系統

捷運直流牽引系統所造成的雜散電流，是一直以來業界關心的重大議題，當雜散電流洩出系統時，將會對主體結構和周遭的地下管線有嚴重電蝕的影響。因此捷運系統的雜散電流總量計算，不管在建設前的模擬評估或營運後的檢測案中，皆是相當重要的工作項目，故須找出一個精確的計算模型來協助工作進行。
現今在計算雜散電流時大多仰賴模擬軟體，但是當是進行整體系統的雜散電流評估時，需要花大量時間來建立起一個龐大的模擬模型，且如此大型的模擬模型在執行上，對一般個人電腦而言也是個沉重的負擔。因此發想將雜散電流計算從電腦軟體的模擬，回歸到數學分析上採用關係式的方法來進行計算，找到一個計算方式能夠精確地預估軌道雜散電流分布狀況，並且可以避免模擬建模上花費大量的時間。
本論文將以雜散電流抑制效果最佳之非接地捷運系統為目標，了解其直流牽引系統的供電結構，並分析軌道對地可能的雜散電流洩漏路徑，以及影響整體洩漏電流量的因素。嘗試以傳統的雜散電流計算方法為基礎，來推導出符合非接地系統雜散電流的計算方法，並以實際數據帶入計算後，以數學分析軟體MATLAB中的SIMULINK¬–SimPower所建立之模型模擬結果來做比較，驗證本論文計算方法的可靠度與精確度，提供一個更快速簡便的雜散電流計算方式供後續研究人員選用或參考。

Stray current is a major issue of the DC traction system. Because the corrosion of stray current will be a great impact to metallic objects that surrounding around the system. So, there is an important mission to find an accurate model to simulate the rail of DC traction systems. To help use estimation the amount of stray current.
Nowadays the calculation of stray currents generally rely on computer software. But when we want to evaluating the stray currents for the overall system. It well takes a lot of time to build a large simulation model, and such a large simulation model is also a heavy burden to regular PC. Therefore, it is necessary made me to found a way to calculate the exact stray current by mathematical analysis not by computer software. And to keep times from building simulation model of the DC traction.
In this paper, we are focus on the ungrounded systems because it have excellent suppression for stray current leakage. To searching and analyze the track structure and the leakage path of ungrounded system. And based on this search to derive the calculation method of the stray current in ungrounded DC traction systems. And then compare the method with simulation software like MATLAB(SIMULINK¬–SimPower) to verified the reliability and accuracy.

目錄
中文摘要 i
英文摘要 ii
致謝 iii
目錄 iv
表目錄 v
圖目錄 vi
第一章 緒論 1
1.1 研究背景 1
1.2 研究方法 7
1.3 內容概述 10
第二章 直流牽引系統的接地與雜散電流 11
2.1 捷運直流牽引系統概述 11
2.2 負軌的接地方式 14
2.3 負軌電位與雜散電流 19
第三章 雜散電流計算方法 21
3.1 分散式電路模型 24
3.1.1 π型等效模型 25
3.1.2 T型等效模型 28
3.2 網目式電路模型 30
3.2.1單層網目式電路模型 32
3.2.2 雙層網目式電路模型 36
第四章 模擬與分析 40
4.1 案例系統介紹 40
4.2 模擬結果 44
4.3 結果討論 50
第五章 結論 53
參考文獻 55

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