【摘要】：隨著電力需求增長(zhǎng),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(diǎn)在人多地少的國(guó)家和地區(qū)得到了廣泛應(yīng)用。我國(guó)220kV及以上電壓等級(jí)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(hù),分相縱聯(lián)差動(dòng)保護(hù)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(hù)作主后備。而傳統(tǒng)距離保護(hù)應(yīng)用于同桿雙回線時(shí),選相元件和測(cè)量阻抗元件受到跨線故障與線間互感影響,容易誤動(dòng)或拒動(dòng)。本論文提出將同桿雙回線作為一個(gè)基本單元配置基于單端雙回線電氣量的一體化保護(hù),主要包括一體化突變量選相元件、測(cè)量阻抗元件和跳合閘邏輯等內(nèi)容的研究。針對(duì)理想換位同桿雙回線典型故障特性分析,將六導(dǎo)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(guān),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(duì)稱有關(guān),據(jù)此形成了故障選相和兩回線狀態(tài)不對(duì)稱相判別依據(jù),再結(jié)合特定異名相線間突變量關(guān)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(duì)保護(hù)安裝處到短路點(diǎn)的六導(dǎo)線電壓電流方程分解,可推導(dǎo)得出涉及本線、鄰線零序補(bǔ)償系數(shù)的表征故障距離的一體化測(cè)量阻抗元件,針對(duì)單相接地故障和多相故障,分別形成6個(gè)單相線接地測(cè)量阻抗元件和12個(gè)異名相線間測(cè)量阻抗元件。將準(zhǔn)三相運(yùn)行等效為兩點(diǎn)斷線故障,借助MATLAB計(jì)算分析各準(zhǔn)三相工況下主要運(yùn)行指標(biāo),并提出一種以導(dǎo)線最大過(guò)載率、負(fù)序電流不平衡度和極限傳輸功率為參考項(xiàng)的綜合評(píng)價(jià)指標(biāo),作為準(zhǔn)三相方式選擇與轉(zhuǎn)換的依據(jù)。為實(shí)現(xiàn)準(zhǔn)三相運(yùn)行,在切除故障電氣特性基礎(chǔ)上,充分發(fā)揮同桿并架線路的優(yōu)勢(shì)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(hù)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(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TM773

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