Suzhou Electric Appliance Research Institute
期刊號: CN32-1800/TM| ISSN1007-3175

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基于行波相關(guān)特征的環(huán)形電網(wǎng)故障定位方法

來源:電工電氣發(fā)布時間:2022-03-24 16:24 瀏覽次數(shù):578

基于行波相關(guān)特征的環(huán)形電網(wǎng)故障定位方法

徐高,瞿峰,周強
(國網(wǎng)江蘇省電力有限公司超高壓分公司,江蘇 南京 210003)
 
    摘 要:由短距離、高電壓等級輸電線路構(gòu)成的城市環(huán)網(wǎng),在發(fā)生故障時的故障行波特征相對復雜。通過研究環(huán)形電網(wǎng)發(fā)生接地故障后的故障行波傳播特征,提出一種環(huán)形電網(wǎng)故障定位方法,該方法采用小波法提取各母線節(jié)點在故障后的行波特征量,根據(jù)各母線節(jié)點初始波頭時間關(guān)系,尋找到一段非故障線路,并根據(jù)各母線波頭時間確定故障線路,對于復雜的母線近區(qū)故障,引入行波極性比較原理確定故障母線,最后經(jīng)雙端行波法精確定位。經(jīng) EMTP 建模聯(lián)合 MATLAB 仿真分析表明,該方法故障定位精度高、效果好,能正確識別母線近區(qū)故障。
    關(guān)鍵詞:環(huán)形電網(wǎng);行波極性;母線近區(qū)故障;故障定位
    中圖分類號:TM711     文獻標識碼:A     文章編號:1007-3175(2022)03-0014-05
 
A Fault Location Method for the Ring Power Grid
Based on Traveling Wave Characteristics
 
XU Gao, QU Feng, ZHOU Qiang
(State Grid Jiangsu Electric Power Co., Ltd. Extra-High Voltage Branch Company, Nanjing 210003, China)
 
    Abstract: The urban ring network structures by the short-distance, high-voltage transmission line and its malfunction traveling wave characteristics are relatively complex when faults occur.The fault traveling wave will propagate after the ground fault occurs in the ring power grid. This paper proposed a fault location method for the ring power grid based on this feature.In this way, the wavelet method was used to extract the traveling wave characteristic of each bus node after the fault and find the non-faulty line according to the initial wave head time relationship of each bus node. The fault line was determined based on the time of each bus wave head. For the complex fault nearby the generatrix,this research introduced the principle of traveling wave polarity comparison to determine the faulty bus, it located the fault accurately by using the double-ended traveling wave method.The EMTP modeling combined with MATLAB simulation analysis shows that the method has high fault location accuracy and significant effect. It could correctly identify the faults in the vicinity of the bus.
    Key words: ring power grid; traveling wave polarity; complex fault nearby the generatrix; fault location
 
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