本文選題：220k + V同塔雙回輸電線路�。� 參考：《南昌大學(xué)》2017年碩士論文

【摘要】：隨著我國經(jīng)濟(jì)建設(shè)的快速發(fā)展,電力需求量越來越大,電網(wǎng)已開始出現(xiàn)輸送能力不足,輸電走廊緊缺等一系列問題,尤其是在經(jīng)濟(jì)發(fā)達(dá)地區(qū)。因此,為了有效地利用土地,降低電力建設(shè)投資以及提高線路走廊單位面積的傳輸容量,使得越來越多的220k V同塔雙回輸電線路投入使用。雖然采用同塔雙回輸電線路輸送電能具有較多的優(yōu)點(diǎn),但是其結(jié)構(gòu)和運(yùn)行特點(diǎn)給電力系統(tǒng)帶來了一些新的問題。日前江西電網(wǎng)220k V某同塔雙回輸電線路出現(xiàn)了嚴(yán)重的三相電流不平衡現(xiàn)象,可能給江西電網(wǎng)的安全運(yùn)行帶來一定的影響,有必要對江西電網(wǎng)中出現(xiàn)的三相電流不平衡現(xiàn)象進(jìn)行研究分析。本文首先對國內(nèi)外研究三相不平衡問題的成果進(jìn)行了介紹,并且對不平衡度計(jì)算理論進(jìn)行了分析;然后在PSASP系統(tǒng)等值的基礎(chǔ)上,對研究線路進(jìn)行了ATP-EMTP仿真建模。后面的研究工作分為兩個(gè)方面。一方面研究可能引起220k V同塔雙回輸電線路不平衡的具體原因,如:導(dǎo)線的換位和更換相序排列方式、桿塔、地線和弧垂等因素對三相電流不平衡度的影響;另一方面根據(jù)研究的具體原因,進(jìn)一步提出改善不平衡問題的措施,對措施的實(shí)施效果進(jìn)行仿真和評價(jià),并將該措施應(yīng)用到省內(nèi)其它市供電公司中進(jìn)一步驗(yàn)證其有效性。針對江西電網(wǎng)在220k V線路的三相電流不平衡現(xiàn)象,本文采用ATP-EMTP對江西電網(wǎng)220k V同塔雙回輸電線路進(jìn)行建模,對線路的不平衡電流進(jìn)行仿真計(jì)算,并與實(shí)測數(shù)據(jù)比較,找出了220k V電網(wǎng)產(chǎn)生不平衡電流的主要影響因素。通過對江西電網(wǎng)220k V同塔雙回線不平衡問題的研究,可有效改善江西電網(wǎng)220k V線路的電流不平衡現(xiàn)象,也可為輸電線路工程的設(shè)計(jì)提供必要的參考依據(jù)。
[Abstract]:With the rapid development of economic construction in China, the demand for electricity is increasing, and a series of problems, such as insufficient transmission capacity and shortage of transmission corridors, have appeared in the power grid, especially in economically developed areas.Therefore, in order to utilize land effectively, reduce the investment of electric power construction and increase the transmission capacity of corridor unit area, more and more 220kV double-circuit transmission lines are put into use.Although using the same tower double circuit transmission line to transmit electric energy has many advantages, its structure and operation characteristics bring some new problems to the power system.A few days ago, a 220kV double-circuit transmission line with the same tower in Jiangxi power grid had a serious phenomenon of three-phase current imbalance, which may have a certain impact on the safe operation of Jiangxi power grid.It is necessary to study and analyze the three-phase current imbalance in Jiangxi power grid.In this paper, the domestic and foreign research results of three-phase imbalance problem are introduced, and the calculation theory of imbalance degree is analyzed, and then the ATP-EMTP simulation modeling of the research circuit is carried out on the basis of PSASP system equivalence.The later research work is divided into two aspects.On the one hand, the specific reasons that may cause the unbalance of 220kV double-circuit transmission line with the same tower are studied, such as the way of transposition and phase sequence arrangement of conductor, the influence of pole tower, ground wire and sag on the unbalance of three-phase current;On the other hand, according to the specific reasons of the study, the paper puts forward further measures to improve the imbalance problem, simulates and evaluates the effect of the implementation of the measure, and applies the measure to other power supply companies in other cities in the province to further verify its effectiveness.Aiming at the unbalance of three-phase current in 220kV transmission line of Jiangxi power network, this paper uses ATP-EMTP to model the 220kV double-circuit transmission line of the same tower in Jiangxi power network, and simulates and calculates the unbalanced current of the transmission line, and compares it with the measured data.The main influencing factors of unbalanced current in 220 kV power network are found out.By studying the unbalance of 220kV double circuit line of the same tower in Jiangxi power network, the current imbalance phenomenon of 220kV transmission line in Jiangxi power grid can be effectively improved, and the necessary reference basis for the design of transmission line project can be provided.
【學(xué)位授予單位】：南昌大學(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：1767267