本文選題：雙回輸電線 + 單相接地故障�。� 參考：《華北電力大學(xué)(北京)》2014年碩士論文

【摘要】：同桿并架雙回輸電線在超、特高壓工程中的應(yīng)用日益廣泛。當(dāng)前實(shí)際運(yùn)行中,平行雙回輸電線距離保護(hù)的效果受雙回線零序互感的影響較大,不能滿足電力系統(tǒng)運(yùn)行的需求。因此研究新的距離保護(hù)算法,提高平行雙回線距離保護(hù)的性能,具有十分重要的理論和現(xiàn)實(shí)意義。本文以一個(gè)平行雙回線雙端輸電系統(tǒng)為研究對(duì)象,建立平行雙回線單相接地故障的系統(tǒng)零序網(wǎng)絡(luò)圖。研究得出雙回輸電線的零序電流比值K是一個(gè)與系統(tǒng)運(yùn)行方式和故障點(diǎn)位置密切相關(guān)的變量。零序電流比值K隨故障距離D的變化是單調(diào)遞增的凹曲線,而且系統(tǒng)零序阻抗越小,曲線的曲率越大。當(dāng)故障距離變化時(shí),平行雙回輸電線的零序電流比值K近似是一個(gè)實(shí)數(shù)。故障距離小于線路長(zhǎng)度85%時(shí),K的值很小,并且隨著故障距離的改變變化不大；當(dāng)故障距離超過線路長(zhǎng)度85%時(shí),K的值隨著故障距離的改變變化很大。當(dāng)線路末端故障時(shí),K為1。提出了一種僅利用單回輸電線單側(cè)電氣量的單相接地故障距離保護(hù)新算法。以不同系統(tǒng)運(yùn)行方式下,距離保護(hù)Ⅰ段保護(hù)范圍末端(線路85%)處最大的零序電流比值K作為整定值Kset,用Kset和本線路零序電流的乘積表示相鄰線路的零序電流,從而得出了針對(duì)單相接地故障僅利用單回輸電線單側(cè)電氣量的距離保護(hù)新算法。通過仿真表明,當(dāng)發(fā)生金屬性接地故障時(shí),新算法在區(qū)內(nèi)故障時(shí)能夠可靠動(dòng)作,區(qū)外故障時(shí)不會(huì)誤動(dòng)。無補(bǔ)償傳統(tǒng)距離保護(hù)算法的保護(hù)范圍會(huì)縮短,會(huì)造成保護(hù)拒動(dòng)。當(dāng)接地電阻為15Ω時(shí),新算法依然有良好的可靠性和準(zhǔn)確性,兩種傳統(tǒng)算法在區(qū)外故障甚至是下級(jí)線路出口故障時(shí),距離保護(hù)會(huì)誤動(dòng)作,發(fā)生超越。最后通過詳細(xì)的仿真證明了新算法有良好的適用性。相鄰線路故障時(shí),新算法可靠性強(qiáng),不會(huì)誤動(dòng),兩種傳統(tǒng)算法均會(huì)發(fā)生誤跳閘。新算法解決了傳統(tǒng)算法在本線路區(qū)內(nèi)故障時(shí)會(huì)導(dǎo)致相鄰線路保護(hù)誤動(dòng)作的難題。系統(tǒng)運(yùn)行方式變化時(shí),新算法距離保護(hù)Ⅰ段的保護(hù)范圍增大,但是線路末端故障時(shí),距離保護(hù)Ⅰ段不會(huì)誤動(dòng)作。無補(bǔ)償傳統(tǒng)算法的保護(hù)范圍縮小。在經(jīng)故障電阻接地時(shí),新算法的距離保護(hù)Ⅰ段動(dòng)作特性良好,傳統(tǒng)算法在區(qū)外故障時(shí)會(huì)誤跳閘。負(fù)荷變化和線路分布電容對(duì)新算法的影響不大。
[Abstract]:The double-circuit transmission line with the same rod is widely used in ultra-high voltage engineering. In actual operation, the effect of distance protection of parallel double-circuit transmission lines is greatly affected by zero-sequence mutual inductance of double-circuit lines, which can not meet the needs of power system operation. Therefore, it is of great theoretical and practical significance to study a new distance protection algorithm to improve the performance of parallel double loop distance protection. In this paper, a parallel double-circuit double-terminal transmission system is taken as the research object, and the zero-sequence network diagram of the single-phase grounding fault of parallel double-circuit line is established. It is concluded that the zero-sequence current ratio K of double-circuit transmission lines is a variable closely related to the operation mode of the system and the location of the fault point. The variation of zero-sequence current ratio K with the fault distance D is a monotone increasing concave curve, and the smaller the zero-sequence impedance, the greater the curvature of the curve. When the fault distance changes, the zero-sequence current ratio K of parallel double-circuit transmission lines is approximately a real number. When the fault distance is less than the line length, the value of K is very small, and with the change of fault distance, the value of K changes greatly with the change of fault distance. When the end of the line fails, the K is 1. A new distance protection algorithm for single-phase grounding fault is proposed. Under different system operation modes, the maximum zero-sequence current ratio K at the end of the protection range (85%) of the distance protection section I is used as the setting value Kset. the product of Kset and the zero-sequence current of this line is used to express the zero-sequence current of adjacent lines. Thus, a new distance protection algorithm for single-phase grounding fault using only single side electric quantity of transmission line is obtained. The simulation results show that the new algorithm can operate reliably in the fault zone and not malfunction in the fault outside the area when the ground fault of gold attribute occurs. The protection range of uncompensated traditional distance protection algorithm will be shortened, which will cause protection rejection. When the grounding resistance is 15 惟, the new algorithm still has good reliability and accuracy. When the two traditional algorithms are out of the area fault or even the lower line outlet fault, the distance protection will misoperate and overstep. Finally, a detailed simulation shows that the new algorithm has good applicability. The new algorithm has strong reliability and no misoperation when the adjacent line is out of order, and the two traditional algorithms will be tripped by mistake. The new algorithm solves the problem that the traditional algorithm can lead to the misoperation of the adjacent line protection when the fault occurs in the local line area. When the operation mode of the system changes, the protection range of the distance protection section I of the new algorithm increases, but the distance protection section I will not be misoperated when the line end failure. The protection range of traditional uncompensated algorithm is reduced. When the fault resistance is grounded, the distance protection section I operation characteristic of the new algorithm is good, and the traditional algorithm will trip by mistake when the fault is out of the area. Load variation and line distribution capacitance have little effect on the new algorithm.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM773

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本文編號(hào)：2115220