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(fù)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(chǔ)上對雙回線進(jìn)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(wǎng)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(chǔ)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(dāng)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(guān)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(yīng)的關(guān)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(guān)系確定單回線故障時相應(yīng)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(zhì),獲得測距方程從而進(jìn)行故障測距。并針對一種特殊的非全程同桿雙回線路進(jìn)行研究,提出故障測距方法。根據(jù)PSCAD仿真結(jié)果表明,該選相和測距方法均比較準(zhǔn)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(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)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(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM75
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，本文編號：2235841
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