本文選題：直流輸電 + 換相失敗�。� 參考：《華北電力大學》2014年碩士論文

【摘要】：高壓直流輸電在我國發(fā)展迅速,處理好安全性和穩(wěn)定性的問題是高壓直流輸電首先需要解決的問題。與交流輸電相比,直流輸電具有輸送容量大,經(jīng)濟效益好,控制靈活,可靠性高等優(yōu)點。由于直流輸電傳輸容量大,經(jīng)常起著聯(lián)絡重要區(qū)域電網(wǎng)的作用,因此直流輸電系統(tǒng)的保護非常重要。直流輸電系統(tǒng)的保護和交流輸電系統(tǒng)的保護在原理和配置上都有很大區(qū)別,直流輸電系統(tǒng)的保護和控制相互影響,保護系統(tǒng)不能忽略控制系統(tǒng)的作用。首先研究高壓直流輸電常見故障及其機理,研究高壓直流輸電換相失敗、換流器故障、線路故障、濾波器故障的現(xiàn)象及其故障機理,并研究減少故障發(fā)生幾率和降低故障影響的措施。在仿真軟件PSCAD/EMTDC中研究直流輸電線路在各種故障下的電磁暫態(tài)相應特性,研究高壓直流線路發(fā)生短路故障時控制系統(tǒng)的響應特性。最后,分析高壓直流輸電線路的故障過程和機理,揭示了直流輸電線路故障時故障行波的傳播特性,并針對行波保護自身的特點,分析行波保護的優(yōu)缺點及使用場合,提出新的行波保護方案。
[Abstract]:High voltage direct current (HVDC) transmission is developing rapidly in our country. It is the first problem that must be solved to deal with the safety and stability of HVDC transmission. Compared with AC transmission, DC transmission has the advantages of large transmission capacity, good economic benefit, flexible control and high reliability. The protection of HVDC transmission system is very important because of its large transmission capacity and the function of connecting with important regional power grid. The protection of HVDC transmission system and the protection of AC transmission system are very different in principle and configuration. The protection and control of HVDC transmission system interact with each other, and the protection system can not ignore the role of control system. First of all, the common faults and their mechanism of HVDC transmission are studied. The phenomena and fault mechanism of HVDC commutation failure, converter fault, line fault and filter fault are studied. The measures to reduce the probability of fault occurrence and to reduce the influence of fault are also studied. In the simulation software PSCAD / EMTDC, the electromagnetic transient characteristics of HVDC transmission lines under various faults are studied, and the response characteristics of the control system in the event of short circuit faults of HVDC lines are studied. Finally, the fault process and mechanism of HVDC transmission line are analyzed, and the propagation characteristics of fault traveling wave are revealed. According to the characteristics of traveling wave protection itself, the advantages and disadvantages of traveling wave protection and its application situation are analyzed. A new traveling wave protection scheme is proposed.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM773;TM721.1

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本文編號：2072565