本文選題：同桿雙回線　切入點(diǎn)：特征分析　出處：《河南理工大學(xué)》2015年碩士論文

【摘要】：為了節(jié)約輸電走廊通道資源,降低電力建設(shè)成本,同時(shí)提高線路單位走廊輸電容量和土地利用率,同桿雙回線路已成為我國220kV及以上輸電線路的首選,并且往往作為電網(wǎng)的主干線路擔(dān)負(fù)著電網(wǎng)超大功率傳輸或區(qū)域電網(wǎng)的聯(lián)絡(luò)重任,因此其安全可靠的運(yùn)行對(duì)電網(wǎng)有極其重要的影響。同桿雙回線路的兩回線間距離較近,存在跨線故障,同時(shí)因線間互感的作用,故障特征更加復(fù)雜,傳統(tǒng)單回線路選相元件應(yīng)用于雙回線路尤其是跨線故障時(shí)易出現(xiàn)誤動(dòng)作。因此論文對(duì)同桿雙回線路進(jìn)行故障特征分析,提取故障電流特征信號(hào),同時(shí)借助PSCAD/EMTDC仿真平臺(tái)驗(yàn)證故障特征分析結(jié)果,并進(jìn)一步探討故障類型、故障位置、過渡電阻對(duì)故障電流特征信號(hào)的影響,在此基礎(chǔ)上提出新型同桿雙回線路工頻量故障選相方法。該方法共分兩步實(shí)現(xiàn),首先,利用同名相和電流的相分量特性,將同桿雙回線路故障等價(jià)為單回線系統(tǒng)故障,根據(jù)等價(jià)單回線系統(tǒng)的電氣量選出故障相別;然后,在選出故障相的基礎(chǔ)上,根據(jù)兩回線同名相電流的比值規(guī)律特性,確定具體故障相線。由仿真結(jié)果可得,兩步選相法不受故障類型、過渡電阻等的影響,對(duì)窄線間距的雙回線路能保證線路80%可靠選相,然而該選相方法在線路近端時(shí)可能誤選相,借助于其他輔助判據(jù)能得到進(jìn)一步改善。針對(duì)目前同桿雙回線路的選相研究多是基于工頻量,暫態(tài)量方面的研究鮮有成果的現(xiàn)狀,為適應(yīng)新型暫態(tài)保護(hù)的選相需求,在提出兩步選相法的基礎(chǔ)上,進(jìn)一步深入研究同桿雙回線路的暫態(tài)量選相。暫態(tài)量選相方案以兩步故障選相法為選相機(jī)理,利用小波變換工具提取同名相和電流、同名相電流的小波暫態(tài)能量,以暫態(tài)能量為判據(jù),構(gòu)成新型的同桿雙回線路暫態(tài)量故障選相原理。仿真驗(yàn)證了暫態(tài)量選相方法的可行性,不僅彌補(bǔ)了工頻量選相在線路近端可靠性不足的缺點(diǎn),而且很大程度上提高了選相速度,改善了保護(hù)性能。此外,論文對(duì)同桿雙回線路的工頻量選相和暫態(tài)量選相進(jìn)行對(duì)比研究,分析各自的優(yōu)缺點(diǎn),對(duì)全面系統(tǒng)的故障選相研究具有重要作用。
[Abstract]:In order to save the transmission corridor resources, reduce the power construction cost, and improve the transmission capacity and land utilization ratio of the unit corridor, the double-circuit transmission line with the same pole has become the first choice of 220kV and above transmission lines in China. And as the main line of the power network, it often bears the heavy responsibility of super power transmission or regional power transmission, so its safe and reliable operation has an extremely important influence on the power network. The distance between the two circuit lines of the double-circuit line with the same pole is close. There are cross-line faults, and the fault features are more complicated because of the mutual inductance between lines. The traditional single circuit phase selection element is easy to misoperate in double circuit line, especially in cross line fault. Therefore, the fault characteristic analysis of the same pole double circuit line is carried out in this paper, and the fault current characteristic signal is extracted. At the same time, the results of fault feature analysis are verified by PSCAD/EMTDC simulation platform, and the influence of fault type, fault location and transition resistance on fault current characteristic signal is further discussed. On this basis, a new phase selection method for power frequency fault of double-circuit line with the same pole is proposed. The method is realized in two steps. Firstly, the fault of double-circuit line with the same pole is equivalent to the fault of single-circuit system by using the phase component characteristics of the same phase and current. The fault phase is selected according to the electrical quantity of the equivalent single circuit system, and then, on the basis of selecting the fault phase, the specific fault phase line is determined according to the ratio characteristics of the phase current of the same name of the two circuit lines. The two-step phase selection method is not affected by fault type, transition resistance, etc. The two-circuit circuit with narrow line spacing can guarantee 80% reliable phase selection. However, the phase selection method may misselect the phase at the near end of the line. With the aid of other auxiliary criterions, the phase selection of double-circuit lines with the same pole can be further improved. In view of the fact that the current research on phase selection is based on the power frequency and transient quantity, it is necessary to meet the needs of phase selection for the new type of transient protection. On the basis of the two-step phase selection method, the transient phase selection of the double-circuit transmission line with the same pole is further studied. The two-step fault phase selection method is used as the camera principle, and the phase and current of the same name are extracted by wavelet transform. The wavelet transient energy of the phase current of the same name, based on the transient energy, constitutes a new principle of phase selection for transient fault of a double-circuit transmission line with the same pole. The feasibility of the transient phase selection method is verified by simulation. It not only makes up for the deficiency of reliability of power frequency phase selection near the line, but also improves the speed of phase selection and the performance of protection to a great extent. In this paper, the power frequency phase selection and the transient phase selection of the double-circuit line are compared and analyzed, which plays an important role in the fault phase selection of the overall system.
【學(xué)位授予單位】：河南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TM75

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