本文關(guān)鍵詞： 分布式電源 繼電保護(hù) 短路電流 準(zhǔn)入容量 配電網(wǎng)　出處：《華北電力大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來,分布式電源作為可靠、高效、經(jīng)濟(jì)的發(fā)電方式得到廣泛的關(guān)注。分布式電源和電網(wǎng)結(jié)合被電力、能源專家們認(rèn)為是節(jié)能降損、節(jié)省投資、提高電力系統(tǒng)的靈活性和可靠性的主要方式。分布式電源的研究和應(yīng)用給電力系統(tǒng)帶來了活力,也帶來了挑戰(zhàn)。傳統(tǒng)的配電網(wǎng)大多為單電源、輻射狀結(jié)構(gòu),保護(hù)的整定也是基于此設(shè)計的。配電網(wǎng)中接入分布式電源后使網(wǎng)絡(luò)結(jié)構(gòu)、電網(wǎng)潮流以及短路電流發(fā)生變化,從而影響保護(hù)的正常運行。 首先,對配電網(wǎng)的三段式電流保護(hù)的原理和整定,自動重合閘與保護(hù)的配合進(jìn)行介紹。對分布式電源的定義、分類、特點以及并網(wǎng)方式進(jìn)行研究,建立了分布式的電源并網(wǎng)的仿真模型。分析分布式電源不同接入點和接入容量對繼電保護(hù)與重合閘的影響,配電網(wǎng)由單電源變?yōu)槎嚯娫聪到y(tǒng),短路電流的分布和大小發(fā)生變化,從而引起保護(hù)以及重合閘的拒動或誤動。電網(wǎng)發(fā)生故障時,還有可能形成非計劃孤島。 其次,分析接入分布式電源短路電流的計算方法,從保護(hù)協(xié)調(diào)性的角度出發(fā),采取串聯(lián)電抗器和限制準(zhǔn)入容量來消除分布式電源與保護(hù)協(xié)調(diào)性的問題。短路時,利用電抗的高阻抗特性限制分布式電源所提供的短路電流。建立分布式電源的準(zhǔn)入容量模型,以線路故障時不影響保護(hù)正常動作為約束,研究單個和多個分布式電源最大準(zhǔn)入容量及其對保護(hù)的影響,算例驗證上述方法的有效性。 最后,針對配電網(wǎng)現(xiàn)有的保護(hù)方案,通過修改整定值、裝設(shè)方向元件和采取差動保護(hù)等對原方案加以改進(jìn)。
[Abstract]:In recent years, distributed power generation, as a reliable, efficient and economical way of generating electricity, has received wide attention. The combination of distributed generation and power grid is considered by energy experts as energy saving and investment saving. The main way to improve the flexibility and reliability of power system. The research and application of distributed generation bring vitality and challenge to power system. The setting of protection is also based on this design. The network structure, power flow and short-circuit current are changed after the distribution network is connected to the distributed generation, which affects the normal operation of the protection. First of all, the principle and setting of three-section current protection in distribution network, the cooperation of automatic reclosing and protection are introduced. The definition, classification, characteristics and grid-connected mode of distributed power generation are studied. The simulation model of distributed power supply connection is established. The influence of different access points and access capacity of distributed power source on relay protection and reclosing is analyzed. The distribution network changes from a single source to a multi-source system, and the distribution and size of short-circuit current change. This will cause protection and reclosure failure or misoperation. Unplanned islands may also be formed when the power network fails. Secondly, the calculation method of short-circuit current in distributed power supply is analyzed. From the point of view of protection coordination, series reactor and limited access capacity are adopted to eliminate the problem of coordination between distributed power supply and protection. By using the high impedance characteristic of reactance to limit the short circuit current provided by distributed power supply, the admission capacity model of distributed power supply is established, which is constrained by the fact that the line failure does not affect the normal operation of the protection. The maximum access capacity of single and multiple distributed power sources and its effect on protection are studied. The effectiveness of the proposed method is verified by an example. Finally, according to the existing protection scheme of distribution network, the original scheme is improved by modifying the setting value, installing directional elements and adopting differential protection.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM77

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 梁才浩,段獻(xiàn)忠;分布式發(fā)電及其對電力系統(tǒng)的影響[J];電力系統(tǒng)自動化;2001年12期

2 盧志剛;董玉香;;含分布式電源的配電網(wǎng)故障恢復(fù)策略[J];電力系統(tǒng)自動化;2007年01期

3 黃偉;雷金勇;夏翔;吳汕;熊軍;王函韻;甘德強(qiáng);;分布式電源對配電網(wǎng)相間短路保護(hù)的影響[J];電力系統(tǒng)自動化;2008年01期

4 王守相;江興月;王成山;;含分布式電源的配電網(wǎng)故障分析疊加法[J];電力系統(tǒng)自動化;2008年05期

5 田軍;朱永強(qiáng);陳彩虹;;儲能技術(shù)在分布式發(fā)電中的應(yīng)用[J];電氣技術(shù);2010年08期

6 謝昊;盧繼平;;重合閘在分布式發(fā)電條件下的應(yīng)用分析[J];重慶大學(xué)學(xué)報(自然科學(xué)版);2007年02期

7 盧君昌;;小電源系統(tǒng)重合閘方式的選擇[J];廣東水利水電;2009年01期

8 池里杰;翁一武;;微型燃?xì)廨啓C(jī)分布式供能系統(tǒng)的控制[J];華東電力;2007年11期

9 郭相國,張保會;自適應(yīng)自動重合閘現(xiàn)狀與發(fā)展[J];繼電器;2004年16期

10 周德才,張保會,趙慧梅;最佳重合閘方案的研究[J];繼電器;2005年01期

，

本文編號：1553150