【摘要】：我國(guó)的電力系統(tǒng)已經(jīng)具有超大容量、大負(fù)荷、高電壓等級(jí)、遠(yuǎn)距離輸送等特點(diǎn),使得短路阻抗越來(lái)越小,導(dǎo)致輸電線路發(fā)生短路時(shí)的故障電流也會(huì)越來(lái)越大。隨著電網(wǎng)的不斷發(fā)展,導(dǎo)致電網(wǎng)中現(xiàn)在使用的斷路器已經(jīng)無(wú)法或即將無(wú)法將線路斷開(kāi),這對(duì)電網(wǎng)的運(yùn)行將會(huì)產(chǎn)生極大的不良影響,因此研究對(duì)短路電流水平的抑制的方法就成為一個(gè)重要的課題。本論文在深入理解磁閥電抗器和橋路型超導(dǎo)限流器的基礎(chǔ)上,提出了新型磁閥橋式超導(dǎo)限流器。本論文分別對(duì)磁閥電抗器和橋式超導(dǎo)限流器進(jìn)行仿真,驗(yàn)證了其作用。對(duì)提出的新型磁閥橋式超導(dǎo)限流器的工作原理和結(jié)構(gòu)進(jìn)行闡述與說(shuō)明,根據(jù)等面積定則分析了該元件對(duì)電力系統(tǒng)暫態(tài)穩(wěn)定的影響；根據(jù)輸電線路距離保護(hù)的原理,分析了該元件對(duì)距離保護(hù)產(chǎn)生的影響,并利用PSCAD搭建該元件的模型,仿真其對(duì)距離保護(hù)的影響；根據(jù)輸電線路電流差動(dòng)保護(hù)的原理,分析了該元件對(duì)線路電流差動(dòng)保護(hù)產(chǎn)生的影響,并利用PSCAD進(jìn)行仿真。分析與仿真的結(jié)果表明,新型磁閥橋式超導(dǎo)限流器能夠提高電力系統(tǒng)的暫態(tài)穩(wěn)定；新型磁閥橋式超導(dǎo)限流器對(duì)電網(wǎng)的距離保護(hù)的影響與該元件的安裝位置有關(guān)系,當(dāng)該元件安裝在保護(hù)裝置的上游時(shí),對(duì)距離保護(hù)沒(méi)有影響,當(dāng)該元件安裝在保護(hù)裝置的下游時(shí),可能會(huì)造成距離保護(hù)的拒動(dòng)；新型磁閥橋式超導(dǎo)限流器對(duì)輸電線路電路差動(dòng)保護(hù)沒(méi)有影響。
[Abstract]:The power system of our country already has the characteristic of super capacity, large load, high voltage grade, long distance transmission and so on, which makes the short circuit impedance smaller and smaller, and the fault current will be larger and bigger when the short circuit occurs in the transmission line. With the continuous development of the power grid, the circuit breaker used in the power network has been unable or will soon be unable to disconnect the line, which will have a great negative impact on the operation of the grid. Therefore, the research on the suppression of short-circuit current level has become an important issue. Based on the deep understanding of magnetic valve reactor and bridge type superconducting current limiter, a novel magnetic valve bridge superconducting current limiter is proposed in this paper. In this paper, the magnetic valve reactor and the bridge superconducting current limiter are simulated, and their functions are verified. The working principle and structure of the new magnetic valve bridge superconducting current limiter are expounded and explained. The influence of the element on the transient stability of power system is analyzed according to the equal area rule, and the principle of transmission line distance protection is also discussed. The influence of the element on distance protection is analyzed, and the model of the element is built by using PSCAD to simulate the influence of the element on distance protection, and according to the principle of transmission line current differential protection, The effect of this element on line current differential protection is analyzed and simulated by PSCAD. The results of analysis and simulation show that the new magnetic valve bridge superconducting current limiter can improve the transient stability of power system, and the influence of the new magnetic valve bridge superconducting current limiter on the distance protection of the power network is related to the installation position of the element. When the element is installed upstream of the protective device, it has no effect on the distance protection, and when the element is installed in the downstream of the protective device, it may cause the distance protection to be rejected. The new magnetic valve bridge superconducting current limiter has no effect on the differential protection of transmission line circuit.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：TM471;TM77

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本文編號(hào)：2172719