同桿雙回線一體化保護與準三相運行研究
發(fā)布時間：2019-05-07 18:21
【摘要】：隨著電力需求增長,同桿并架輸電線因其出線走廊窄、輸電容量大、供電可靠性高等優(yōu)點在人多地少的國家和地區(qū)得到了廣泛應用。我國220kV及以上電壓等級同桿雙回線數(shù)量日益增多,其中大多數(shù)為全程同桿并架。作為同桿雙回線的首選主保護,分相縱聯(lián)差動保護可靠性受到縱聯(lián)通信通道制約,亟需基于單端電氣量的保護作主后備。而傳統(tǒng)距離保護應用于同桿雙回線時,選相元件和測量阻抗元件受到跨線故障與線間互感影響,容易誤動或拒動。本論文提出將同桿雙回線作為一個基本單元配置基于單端雙回線電氣量的一體化保護,主要包括一體化突變量選相元件、測量阻抗元件和跳合閘邏輯等內(nèi)容的研究。針對理想換位同桿雙回線典型故障特性分析,將六導線故障電氣量分解為三相同向和異向故障相量,發(fā)現(xiàn)同向故障相量特征主要與故障涉及相別有關,而異向故障相量特征主要與兩回線同名相故障狀態(tài)是否對稱有關,據(jù)此形成了故障選相和兩回線狀態(tài)不對稱相判別依據(jù),再結合特定異名相線間突變量關系選線和零同序電壓電流突變量判斷接地,從而形成完整的一體化突變量選相元件。利用相分量法對保護安裝處到短路點的六導線電壓電流方程分解,可推導得出涉及本線、鄰線零序補償系數(shù)的表征故障距離的一體化測量阻抗元件,針對單相接地故障和多相故障,分別形成6個單相線接地測量阻抗元件和12個異名相線間測量阻抗元件。將準三相運行等效為兩點斷線故障,借助MATLAB計算分析各準三相工況下主要運行指標,并提出一種以導線最大過載率、負序電流不平衡度和極限傳輸功率為參考項的綜合評價指標,作為準三相方式選擇與轉(zhuǎn)換的依據(jù)。為實現(xiàn)準三相運行,在切除故障電氣特性基礎上,充分發(fā)揮同桿并架線路的優(yōu)勢減少切除線路和重合閘,形成同桿雙回線一體化跳合閘策略作為一體化保護的執(zhí)行元件。
[Abstract]:With the increase of power demand, the same pole and parallel transmission line has been widely used in many countries and regions because of its narrow exit corridor, large transmission capacity and high reliability of power supply. In China, the number of 220kV and above voltage grade double circuit lines is increasing day by day, and most of them are full-length parallel pole. As the first choice of the main protection for the same-pole double circuit line, the reliability of the split-phase vertical differential protection is restricted by the longitudinal communication channel, so it is urgent to use the protection based on the single-terminal electric volume as the main backup. When the traditional distance protection is applied to the double circuit line of the same rod, the phase-selecting element and the measuring impedance element are affected by the cross-line fault and the mutual inductance between the lines, so it is easy to misoperate or refuse to move. This paper presents an integrated protection based on single-ended and double-circuit electric volume with the same pole double circuit as a basic unit, which mainly includes the research of the integrated sudden phase selection element, the measuring impedance element and the trip-closing logic and so on. Based on the analysis of typical fault characteristics of ideal transposition double circuit line, the electric volume of six-wire fault is decomposed into three identical and different direction fault phasor, and it is found that the characteristic of the same direction fault phasor is mainly related to the difference of fault involved. However, the phasor characteristics of different faults are mainly related to the symmetry of the fault state of the same phase of the two circuit lines, thus forming the basis for distinguishing the fault phase selection and the asymmetrical state of the two circuit lines. Combined with the relationship between the abrupt variables of the special synonym lines and the zero synchronous voltage and current sudden variables, the earthing can be judged, thus forming a complete integrated phase selecting element of the sudden variables. The phase component method is used to decompose the six-wire voltage and current equation from the protection installation point to the short circuit point, and the integrated measuring impedance element involving the zero sequence compensation coefficient of the local line and the adjacent line is derived, which indicates the fault distance. Aiming at single-phase grounding fault and multi-phase fault, six single-phase line grounding impedance elements and 12 heterogeneous phase line measurement impedance elements are formed respectively. The quasi-three-phase operation is equivalent to two-point broken line fault, the main operating indexes under each quasi-three-phase operating condition are calculated and analyzed by means of MATLAB, and a kind of maximum over-loading rate of conductor is put forward. The negative sequence current imbalance and the limit transmission power are the comprehensive evaluation indexes of the reference term, which can be used as the basis for the selection and conversion of quasi-three-phase mode. In order to realize the quasi-three-phase operation, on the basis of the electrical characteristics of the cut-off fault, the advantages of the same-pole parallel line are fully utilized to reduce the cut-off line and reclosure, and the integrated trip-off strategy of the same-pole double-circuit line is formed as the executive element of the integrated protection.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM773
本文編號：2471297
[Abstract]:With the increase of power demand, the same pole and parallel transmission line has been widely used in many countries and regions because of its narrow exit corridor, large transmission capacity and high reliability of power supply. In China, the number of 220kV and above voltage grade double circuit lines is increasing day by day, and most of them are full-length parallel pole. As the first choice of the main protection for the same-pole double circuit line, the reliability of the split-phase vertical differential protection is restricted by the longitudinal communication channel, so it is urgent to use the protection based on the single-terminal electric volume as the main backup. When the traditional distance protection is applied to the double circuit line of the same rod, the phase-selecting element and the measuring impedance element are affected by the cross-line fault and the mutual inductance between the lines, so it is easy to misoperate or refuse to move. This paper presents an integrated protection based on single-ended and double-circuit electric volume with the same pole double circuit as a basic unit, which mainly includes the research of the integrated sudden phase selection element, the measuring impedance element and the trip-closing logic and so on. Based on the analysis of typical fault characteristics of ideal transposition double circuit line, the electric volume of six-wire fault is decomposed into three identical and different direction fault phasor, and it is found that the characteristic of the same direction fault phasor is mainly related to the difference of fault involved. However, the phasor characteristics of different faults are mainly related to the symmetry of the fault state of the same phase of the two circuit lines, thus forming the basis for distinguishing the fault phase selection and the asymmetrical state of the two circuit lines. Combined with the relationship between the abrupt variables of the special synonym lines and the zero synchronous voltage and current sudden variables, the earthing can be judged, thus forming a complete integrated phase selecting element of the sudden variables. The phase component method is used to decompose the six-wire voltage and current equation from the protection installation point to the short circuit point, and the integrated measuring impedance element involving the zero sequence compensation coefficient of the local line and the adjacent line is derived, which indicates the fault distance. Aiming at single-phase grounding fault and multi-phase fault, six single-phase line grounding impedance elements and 12 heterogeneous phase line measurement impedance elements are formed respectively. The quasi-three-phase operation is equivalent to two-point broken line fault, the main operating indexes under each quasi-three-phase operating condition are calculated and analyzed by means of MATLAB, and a kind of maximum over-loading rate of conductor is put forward. The negative sequence current imbalance and the limit transmission power are the comprehensive evaluation indexes of the reference term, which can be used as the basis for the selection and conversion of quasi-three-phase mode. In order to realize the quasi-three-phase operation, on the basis of the electrical characteristics of the cut-off fault, the advantages of the same-pole parallel line are fully utilized to reduce the cut-off line and reclosure, and the integrated trip-off strategy of the same-pole double-circuit line is formed as the executive element of the integrated protection.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM773
【參考文獻】
相關期刊論文 前10條
1 張海;黃少鋒;;利用電壓輔助電流選相的同桿雙回線單端電氣量選相原理[J];中國電機工程學報;2013年07期
2 李博通;李永麗;;同桿雙回線跨線永久性故障識別方法[J];電力系統(tǒng)自動化;2012年03期
3 張琦兵;邰能靈;;基于六序電流分量的同塔多回線橫差保護選線元件[J];電力系統(tǒng)自動化;2011年14期
4 楊忠禮;宋國兵;姚永峰;梁振鋒;索南加樂;;基于跨線故障判別的平行雙回線路選相方案[J];西安交通大學學報;2011年02期
5 宋國兵;劉志良;康小寧;趙選宗;索南加樂;;一種同桿并架雙回線接地距離保護方案[J];電力系統(tǒng)保護與控制;2010年12期
6 穆國強;孫金鳳;李珂;張文輝;王國江;楊曉望;;同桿并架雙回線零序互感對距離保護的影響研究[J];陜西電力;2010年05期
7 孟遠景;鄢安河;李瑞生;胡家躍;;同桿雙回線的六相序阻抗距離保護方案研究[J];電力系統(tǒng)保護與控制;2010年06期
8 李瑞生;鄢安河;樊占峰;曹麗璐;;同桿并架雙回線繼電保護工程應用實踐[J];電力系統(tǒng)保護與控制;2010年05期
9 張保會;郝治國;;智能電網(wǎng)繼電保護研究的進展(二)——保護配合方式的發(fā)展[J];電力自動化設備;2010年02期
10 陳橋平;蔡澤祥;劉為雄;曾耿暉;肖偉強;;同桿線路跨線故障對選相元件的影響機理[J];電力自動化設備;2010年02期
相關博士學位論文 前2條
1 張海;同桿雙回線故障穩(wěn)態(tài)分析及其單端量選相的研究[D];華北電力大學;2013年
2 俞波;超高壓同桿并架雙回線路微機保護的研究[D];華北電力大學（北京）;2003年
相關碩士學位論文 前3條
1 朱慶鋼;同塔雙回不換位輸電線路不平衡度研究[D];華南理工大學;2013年
2 仇成;同桿并架雙回線路縱聯(lián)保護與選相技術研究[D];華中科技大學;2009年
3 李首宇;基于六序分量的同桿并架雙回線綜合選相方法研究[D];天津大學;2008年
，本文編號：2471297
本文鏈接：http://sikaile.net/kejilunwen/dianlilw/2471297.html
教材專著
