結合故障定位及傳輸線參數估測於動態熱額定之應用

The Appication of Dynamic Thermal Rating by Combining Fault Location and Transmission Line Parameter Estimation

吳玉伯(Yu-Po Wu)

指導教授 ： 劉志文

國立臺灣大學/電機資訊學院/電機工程學研究所/碩士(2013年)

https://doi.org/10.6342/NTU.2013.10179

摘要

有鑑於架空傳輸線分布廣泛，往往跨越多個氣候上差異顯著的區域。且某些氣候時變率較劇烈的區域其氣候參數不易準確地即時測得，故以往採較保守方式，即穩態熱額定評估輸電線之輸電額定容量。此低估輸電額定的方法固然較為安全，但在用電需求與逐年遽增的現代，此法易造成線路成本上許多非必要的浪費。本論文先結合前人開發之故障定位及參數估測並模擬驗證其準確度，以確保將參數估測用於計算單位長度電阻之可能性。IEEE738所訂出之傳輸線熱額定容量標準中，其中九個受空氣影響之參數僅根據不同情況給予一至二個參考數值，對於傳輸線單位長度電阻僅用線性內插法予以估算。故本論文提出使用線上參數估測法搭配離線參數估測法求得傳輸線之單位長度電阻，並根據當地實測數據校正空氣相關參數數值，以降低不同時間及地點下空氣相關參數之誤差。

關鍵字

動態熱額定容量 ； 故障定位指標 ； 傳輸線參數估測

並列摘要

Overhead transmission lines often stretch across many regions of different climate conditions. And measuring precisely weather parameters of some districts where the weather conditions vary severly is also difficult. Considering these situations, conservative method, which is called steady-state thermal rating was adopted to evaluate the ampacity of transmission lines. This method underrates the ampacity of transmission lines for security and inevitably increase the cost in constructing power grids since the demand of electric power has been rising for years. This thesis combines fault location and parameters estimation, and simulate some program to verify the accuracy to ensure the feasibility. In IEEE Standard 738, there are nine parameters which are influenced by air conditions and assigned one or two values in two different situations. For the resistance per meter of transmission line, it is estimated by linear interpolation in IEEE Standard 738. So this thesis suggests to estimate the resistance per meter of transmission line by using on-line and off-line methods and according to realistic data to correct the parameters influenced by air to decrease the error on different time and position.

並列關鍵字

Dynamic Thermal Rating ； fault location index ； transmission line parameters estimation

參考文獻

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