不對稱參數(shù)同桿并架雙回線故障選相和測距方法的研究
發(fā)布時間：2018-09-11 06:11
【摘要】：同桿并架雙回線可以有效提升線路單位走廊的輸電效率,降低輸電的成本,近年來已逐漸取代單回線成為主要的輸電線路。由于同桿并架線路雙回線之間的距離較近,不僅存在相間互感,相鄰兩線之間也會存在互感,其故障類型也更為復雜,這使得同桿并架雙回線的故障選相和故障測距存在一定的難度�，F(xiàn)在較多在六序分量法的基礎上對雙回線進行故障選相和故障測距,但是由于六序分量法并不適用于參數(shù)不對稱的同桿雙回線,所以深入開展不對稱參數(shù)同桿雙回線的故障選相和測距方法的研究,對于保證電網運行的穩(wěn)定性具有重要的理論和現(xiàn)實意義。本文在新的解耦方法的基礎上提出了針對不對稱參數(shù)同桿雙回線的故障選相和測距方法。當線路發(fā)生故障時,可以根據(jù)故障邊界條件得到序分量之間的幅值和相位關系。不同線路發(fā)生故障時,兩回線正序分量的電流幅值不同;同一回線發(fā)生不同類型的故障時,序電流分量的幅值有對應的關系;同一類型的不同相發(fā)生故障時,序分量的相位不同�？梢愿鶕�(jù)上述關系確定單回線故障時相應的選相判據(jù),并給出了選相流程。通過采集線路兩端故障前后的相電壓和電流值,利用新的解耦方法得到序電壓和序電流,根據(jù)從兩端計算的故障點的序電壓相等這一性質,獲得測距方程從而進行故障測距。并針對一種特殊的非全程同桿雙回線路進行研究,提出故障測距方法。根據(jù)PSCAD仿真結果表明,該選相和測距方法均比較準確,而且不受故障類型,故障位置和過渡電阻等因素的影響。
[Abstract]:In recent years, the single circuit line has been gradually replaced by the single circuit line as the main transmission line, which can effectively improve the transmission efficiency and reduce the transmission cost of the unit corridor. Due to the close distance between the double circuit lines of the same line, there is not only mutual inductance between phases, but also mutual inductance between adjacent two lines, and the fault type is more complex. This makes the fault phase selection and fault location of the double circuit line of the same pole and frame have some difficulty. At present, the fault phase selection and fault location of double-circuit lines are mostly carried out on the basis of six-sequence component method. However, the six-sequence component method is not suitable for double-circuit lines with asymmetric parameters. Therefore, it is of great theoretical and practical significance to deeply study the fault phase selection and location method for asymmetric double-circuit lines with the same pole and pole, which is of great theoretical and practical significance to ensure the stability of power network operation. Based on the new decoupling method, this paper presents a fault phase selection and location method for the asymmetrical parameters of the same rod double circuit line. The amplitude and phase relationship between the sequence components can be obtained according to the fault boundary condition when the fault occurs. When different lines fail, the amplitude of positive sequence component of two circuit lines is different; when different types of faults occur on the same circuit, the amplitude of sequence current component has a corresponding relationship; when the same type of fault occurs in different phases, the amplitude of sequence current component has a corresponding relationship. The phase of the sequence component is different. According to the above relation, the phase selection criterion for single circuit fault can be determined, and the flow chart of phase selection is given. By collecting the phase voltage and current value before and after the fault at both ends of the line, the sequence voltage and sequence current are obtained by using the new decoupling method. According to the property that the sequence voltage of the fault point calculated from both ends is equal, the fault location equation is obtained and the fault location equation is obtained. A fault location method is proposed for a special non-whole-range dual-circuit. The results of PSCAD simulation show that the phase selection and location method are accurate and are not affected by fault type, fault location and transition resistance.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM75
本文編號：2235841
[Abstract]:In recent years, the single circuit line has been gradually replaced by the single circuit line as the main transmission line, which can effectively improve the transmission efficiency and reduce the transmission cost of the unit corridor. Due to the close distance between the double circuit lines of the same line, there is not only mutual inductance between phases, but also mutual inductance between adjacent two lines, and the fault type is more complex. This makes the fault phase selection and fault location of the double circuit line of the same pole and frame have some difficulty. At present, the fault phase selection and fault location of double-circuit lines are mostly carried out on the basis of six-sequence component method. However, the six-sequence component method is not suitable for double-circuit lines with asymmetric parameters. Therefore, it is of great theoretical and practical significance to deeply study the fault phase selection and location method for asymmetric double-circuit lines with the same pole and pole, which is of great theoretical and practical significance to ensure the stability of power network operation. Based on the new decoupling method, this paper presents a fault phase selection and location method for the asymmetrical parameters of the same rod double circuit line. The amplitude and phase relationship between the sequence components can be obtained according to the fault boundary condition when the fault occurs. When different lines fail, the amplitude of positive sequence component of two circuit lines is different; when different types of faults occur on the same circuit, the amplitude of sequence current component has a corresponding relationship; when the same type of fault occurs in different phases, the amplitude of sequence current component has a corresponding relationship. The phase of the sequence component is different. According to the above relation, the phase selection criterion for single circuit fault can be determined, and the flow chart of phase selection is given. By collecting the phase voltage and current value before and after the fault at both ends of the line, the sequence voltage and sequence current are obtained by using the new decoupling method. According to the property that the sequence voltage of the fault point calculated from both ends is equal, the fault location equation is obtained and the fault location equation is obtained. A fault location method is proposed for a special non-whole-range dual-circuit. The results of PSCAD simulation show that the phase selection and location method are accurate and are not affected by fault type, fault location and transition resistance.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM75
【參考文獻】
相關期刊論文 前10條
1 李振興;田斌;李振華;徐艷春;張騰飛;;適用于單/雙回線的雙端非同步故障測距方法[J];電力系統(tǒng)自動化;2016年22期
2 王明佳;張艷霞;;一種新的六相輸電系統(tǒng)故障分析方法[J];電力系統(tǒng)及其自動化學報;2016年09期
3 田書;劉芳芳;任曉明;;基于暫態(tài)量的同塔雙回線路故障選相研究[J];電力系統(tǒng)保護與控制;2015年01期
4 馬靜;史宇欣;馬偉;王增平;;基于分布參數(shù)的同桿雙回線跨線及接地故障單端定位方法[J];電網技術;2014年09期
5 許侃;范春菊;許錦喜;;經過渡電阻短路接地故障的計算方法研究[J];電力系統(tǒng)保護與控制;2014年07期
6 羅金忠;祁秋民;孫玉誠;;同塔多回輸電技術應用分析[J];青海電力;2013年03期
7 劉玉萍;林圣;何文;何正友;;動態(tài)條件下基于在線參數(shù)估計的故障定位算法[J];電力系統(tǒng)自動化;2013年13期
8 張海;黃少鋒;郝曉輝;;雙回線故障特征及其選相方式的研究[J];華北電力大學學報(自然科學版);2013年02期
9 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
10 梁睿;孫式想;;單端行波故障測距的組合方法研究[J];電網技術;2013年03期
，本文編號：2235841
本文鏈接：http://www.wukwdryxk.cn/kejilunwen/dianlidianqilunwen/2235841.html
最近更新
教材專著
