研究生: |
許文興 Wen-Shing Hsu |
---|---|
論文名稱: |
混合345 kV架空與地下電力電纜傳輸線數位測距保護之研究 Study of Digital Distance Relaying in Combined 345 kV Overhead and Underground Power Transmission Lines |
指導教授: |
辜志承
Jyh-Cherng Gu |
口試委員: |
蕭宏清
Hung-Ching Hsiao 王順源 Shun-Yuan Wang 何子儀 Tze-Yee Ho |
學位類別: |
碩士 Master |
系所名稱: |
電資學院 - 電機工程系 Department of Electrical Engineering |
論文出版年: | 2005 |
畢業學年度: | 93 |
語文別: | 中文 |
論文頁數: | 133 |
中文關鍵詞: | 數位濾波演算法 、FORTRAN 、EMTP 、測距電驛 |
外文關鍵詞: | full cycle discrete fourier transform, EMTP, digital protection relay, FORTRAN |
相關次數: | 點閱:592 下載:7 |
分享至: |
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隨著電力負載逐年增加,為求電力供電的穩定,其電力傳輸線路之事故已不容忽視;因此,為能快速判定傳輸線路故障點之相關數據,並提昇其準確性,本論文利用數位式電驛保護與故障定位演算法,在各種不同故障狀態下,提出可行之計算方式。
首先,使用全週期離散傅立葉轉換(Full Cycle Discrete Fourier Transform, FCDFT)數位濾波演算法,求出電壓、電流的基本波相量值,利用基本波相量做故障偵測、判別故障種類及計算故障距離。其次,採用電磁暫態程式(Electromagnetic Transient Program, EMTP),嘉民-南科線路故障案例進行模擬;最後,其線路故障電壓與電流數據利用FORTRAN程式語言模擬輸電線路濾波演算,其模擬結果顯示,對故障偵測、故障類別判定、故障距離計算及故障後之跳脫時間判別等,均能正確計算實現,但輸電線路為集中式模型,未考慮分佈電容效應及未採用長程輸電線模型,故在地下電力電纜處之故障測距最大估測誤差達23%,架空輸電線路平均誤差在1.5%範圍以內。
The contingencies in transmission line are more serious as the power demand is keeping increase lately. To improve the accuracy in diagnosis and to obtain the contingency status on transmission line, the thesis presents a calculating method applying digital protection relay and fault location algorithm in many kinds of fault condition.
First of all, using Full Cycle Discrete Fourier Transform (FCDFT) to obtain the fundamental component of voltage and of current, and therefore the fault-detection, discrimination of the fault type, and calculation of the fault distance can be calculated by the obtained fundamental component. Secondly, using Electromagnetic Transient Program (EMTP) to simulate the contingency happened in Ghiamin-Nankir transmission line and to obtain the voltage and current value in contingency. Finally, through the filter simulating of FORTRAN programming, results obtained show that fault-detection, discrimination of the fault type, calculation of the fault distance, and calculation of the tripping time can be calculated correctly. However, to the centralizing model without considering capacitive effect and without adopting long-distance transmission models, the error rate of location-estimating can limited fewer than 23% upon underground cable and the average of location-estimating can limited less than 1.5% upon overhead transmission line.
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