基于參數(shù)識(shí)別的小電流接地故障選線(xiàn)定位研究
劉哲1,呂鵬2,孫建東2
(1 國(guó)網(wǎng)南京供電公司,江蘇 南京 210019;2 國(guó)電南瑞科技股份有限公司,江蘇 南京 210061)
摘 要:針對(duì)小電流接地故障選線(xiàn)定位存在的難題,建立了基于線(xiàn)路集中參數(shù)下的單相接地故障零序等效模型,通過(guò)分析各線(xiàn)路電氣量特征,把其等效為電容模型,根據(jù)求解的線(xiàn)路對(duì)地電容值判斷是否為故障線(xiàn)路。同時(shí)建立故障線(xiàn)路數(shù)學(xué)模型,利用零序電壓、電流數(shù)據(jù)求解模型參數(shù),依據(jù)所得參數(shù)計(jì)算故障點(diǎn)至母線(xiàn)的距離,從而實(shí)現(xiàn)接地點(diǎn)的精準(zhǔn)定位。經(jīng)RTDS故障仿真和MATLAB數(shù)據(jù)處理驗(yàn)證該方法正確可靠,選線(xiàn)定位精度高,且不受中性點(diǎn)接地方式和不穩(wěn)定電弧的影響,有較強(qiáng)的耐過(guò)渡電阻能力,滿(mǎn)足集故障識(shí)別、選線(xiàn)和定位為一體的自動(dòng)化要求。
關(guān)鍵詞:小電流接地故障;單相接地故障;選線(xiàn)定位;電容模型;參數(shù)識(shí)別;區(qū)段定位
中圖分類(lèi)號(hào):TM711;TM862 文獻(xiàn)標(biāo)識(shí)碼:A 文章編號(hào):1007-3175(2018)08-0034-06
Study of Fault Line Selection and Fault Point Location in Small Current Neutral Grounding
Fault Based on Parameter Identification
LIU Zhe1, LV Peng2, SUN Jian-dong2
(1 State Grid Nanjing Power Supply Company, Nanjing 210019, China;2 State Grid NARI Technology Co., Ltd, Nanjing 210061, China)
Abstract: Aiming at the problem existing in the route selection location of small current neutral grounding fault, this paper established the single-phase grounding fault zero-sequence equivalent model. Through analysis of the electrical characteristics of each line, it was equaled to a capacitance model. Based on the solution circuit, the judgment of grounded capacitance value would be made on whether it was a fault line. At the same time the mathematical model of fault line was established. The model parameters for fault lines could be solved with the zero sequence voltage and current. Based on the parameters of the fault, the distance from the fault point to bus bar could be calculated to realize the accurate location of the fault.This principle has been verified via a RTDS simulator and MATLAB data processed tool. The method above has higher reliability and better capability of the fault resistance endurance, which is free from the impact of neutral grounding modes and unstable fault arc. Particularly, it can be combined with fault identification, fault line selection and fault location, which is satisfying the automated requirements.
Key words: small current neutral grounding fault; single-phase earth fault; route selection location; capacitance model; parameter identification; zone location
參考文獻(xiàn)
[1] 郭清滔,吳田. 小電流接地系統(tǒng)故障選線(xiàn)方法綜述[J]. 電力系統(tǒng)保護(hù)與控制,2010,38(2):146-152.
[2] 薛永端,李天友,李偉新,等. 小電流接地故障暫態(tài)分析及區(qū)段定位新方法[J]. 電力系統(tǒng)自動(dòng)化,2014,38(23):101-107.
[3] 索南加樂(lè),張超,王樹(shù)剛. 基于模型參數(shù)識(shí)別法的小電流接地故障選線(xiàn)研究[J]. 電力系統(tǒng)自動(dòng)化,2004,28(19):65-70.
[4] 趙新紅,袁洪,車(chē)偉,等. 小波變換在小電流接地電弧故障選線(xiàn)中的應(yīng)用[J]. 高電壓技術(shù),2005,31(10):18-20.
[5] 平勇陳. 小電流接地系統(tǒng)單相接地故障選線(xiàn)方法的研究[J]. 華東電力,2014,42(7):1410-1414.
[6] 吳樂(lè)鵬,黃純,林達(dá)斌,等. 基于暫態(tài)小波能量的小電流接地故障選線(xiàn)新方法[J]. 電力自動(dòng)化設(shè)備,2013,33(5):70-75.
[7] 薛永端,張秋鳳,顏廷純,等. 綜合暫態(tài)與工頻信息的諧振接地系統(tǒng)小電流接地故障選線(xiàn)[J]. 電力系統(tǒng)自動(dòng)化,2014,38(24):80-85.
[8] 肖波,張顯,王西偉,等. 基于模糊神經(jīng)網(wǎng)絡(luò)的小電流接地系統(tǒng)單相接地故障定位研究[J]. 儀表技術(shù)與傳感器,2014(3):65-67.
[9] 陳奎,韋曉廣,陳景波,等. 基于樣本數(shù)據(jù)處理和ADABOOST的小電流接地故障選線(xiàn)[J]. 中國(guó)電機(jī)工程學(xué)報(bào),2014,34(34):6228-6237.
[10] 高志鵬,張慧芬,孫旭娜. 注入半波直流的小電流接地故障選線(xiàn)定位方法[J]. 電力系統(tǒng)保護(hù)與控制,2013,41(13):139-145.
[11] 宋國(guó)兵,馬志賓,靳幸福,等. 基于參數(shù)識(shí)別的配電網(wǎng)單相接地故障區(qū)段定位方法:CN103454555A[P].2013-12-18.
[12] 李森,宋國(guó)兵,康小寧,等. 基于時(shí)域下相關(guān)分析法的小電流接地故障選線(xiàn)[J]. 電力系統(tǒng)保護(hù)與控制,2008,36(13):15-20.