本文選題：分布式發(fā)電 + 方向保護(hù)��； 參考：《東南大學(xué)》2015年碩士論文

【摘要】：隨著化石能源危機(jī)以及環(huán)境問題日益嚴(yán)重,分布式發(fā)電(DG)技術(shù)越來越受到人們的重視。分布式發(fā)電以其靈活、經(jīng)濟(jì)、可靠等優(yōu)點(diǎn),使其接入配電網(wǎng)成為不可避免的趨勢(shì)和發(fā)展方向。但分布式發(fā)電的應(yīng)用改變了傳統(tǒng)配電網(wǎng)的拓?fù)浣Y(jié)構(gòu),從單電源的輻射結(jié)構(gòu)改變?yōu)槎嚯娫吹膹?fù)雜網(wǎng)絡(luò),改變了系統(tǒng)故障電流的大小,潮流的流向,某些線路甚至出現(xiàn)了潮流雙向流動(dòng)的現(xiàn)象。根據(jù)IEEE1547規(guī)定,配電網(wǎng)發(fā)生故障后必須立即切除DG,恢復(fù)配電網(wǎng)絡(luò)原有的輻射狀結(jié)構(gòu)并以三段式電流保護(hù)動(dòng)作切除故障。這即損害了DG發(fā)電商和DG用戶的利益,又在一定程度上限制了新能源發(fā)電產(chǎn)業(yè)的發(fā)展,這也從另一方面凸顯出當(dāng)下研究含DG配電網(wǎng)保護(hù)方案的必要性。本文從DG對(duì)配電網(wǎng)保護(hù)影響著手,分析了含DG配電網(wǎng)方向保護(hù)的研究現(xiàn)狀,并指出其不足及待改進(jìn)的地方。在此基礎(chǔ)上,從保護(hù)策略層面出發(fā),提出一種“充分式”保護(hù)策略,其基本思想是基于配電網(wǎng)現(xiàn)有的條件,充分利用不完整的網(wǎng)絡(luò)信息,挖掘適用于含DG配電網(wǎng)的充分式故障定位和隔離方案,不要求該策略能夠解決配電網(wǎng)所有的問題,但是必須能夠解決大部分甚至絕大部分的問題。相比于傳統(tǒng)的保護(hù)策略,該保護(hù)策略更適用于目前的配電網(wǎng)環(huán)境。依據(jù)“充分式”保護(hù)思想,從配電網(wǎng)絡(luò)整體出發(fā),深入研究含DG配電網(wǎng)的故障電流特點(diǎn)。針對(duì)配電網(wǎng)中的不對(duì)稱故障采用基于負(fù)序電流幅值、相位的故障方向判據(jù),針對(duì)配電網(wǎng)中的對(duì)稱故障采用基于正序故障電流幅值、相位的故障方向判據(jù),并提出相應(yīng)的故障區(qū)域判定方案。然后,在已確定的故障區(qū)域內(nèi),以負(fù)荷電流相位為基準(zhǔn),通過對(duì)比線路兩端故障后的電流相位來準(zhǔn)確定位故障區(qū)間。通過該方案不僅能夠?qū)崿F(xiàn)對(duì)故障區(qū)間的準(zhǔn)確定位,還在一定程度上減少了配電網(wǎng)的通信量。最后,總結(jié)出基于“充分式”方向保護(hù)的配電網(wǎng)保護(hù)方案,并詳細(xì)分析了其結(jié)構(gòu)和流程。在Matlab/Simulink平臺(tái)上建立含DG配電網(wǎng)模型,對(duì)其進(jìn)行動(dòng)態(tài)仿真。結(jié)合理論分析和仿真,結(jié)論表明該方案在配電網(wǎng)的不同故障類型下均有較強(qiáng)的適應(yīng)性,能夠迅速、準(zhǔn)確地切除配電網(wǎng)故障。
[Abstract]:With the crisis of fossil energy and the increasingly serious environmental problems, distributed power generation (DG) technology has been paid more and more attention. Because of its advantages of flexibility, economy and reliability, distributed generation has become an inevitable trend and development direction. However, the application of distributed generation has changed the topology of traditional distribution network, from the radiation structure of single power source to the complex network of multiple power sources, and changed the magnitude of system fault current and the flow direction of power flow. Some lines even appear the phenomenon of two-way flow of tidal current. According to IEEE1547, the distribution network must be excised immediately after failure, the original radiation structure of distribution network should be restored and the fault should be removed by three-segment current protection. This not only damages the interests of DG generators and DG users, but also restricts the development of new energy generation industry to a certain extent, which also highlights the necessity of current research on DG distribution network protection scheme. Based on the influence of DG on distribution network protection, this paper analyzes the present situation of direction protection with DG distribution network, and points out its deficiency and the place to be improved. On this basis, from the level of protection strategy, a "sufficient" protection strategy is put forward. Its basic idea is to make full use of incomplete network information based on the existing conditions of distribution network. Mining is suitable for adequate fault location and isolation scheme with DG distribution network. It is not required that the strategy can solve all the problems of distribution network, but it must be able to solve most or most of the problems. Compared with the traditional protection strategy, this protection strategy is more suitable for the current distribution network environment. According to the idea of "adequate" protection, the characteristics of fault current in distribution network containing DG are studied in detail from the whole distribution network. The fault direction criterion based on negative sequence current amplitude and phase is used for asymmetric fault in distribution network, and the fault direction criterion based on positive sequence fault current amplitude and phase is used for symmetrical fault in distribution network. At the same time, the corresponding fault zone decision scheme is put forward. Then, in the determined fault area, the load current phase is taken as the reference, and the fault interval is accurately located by comparing the current phase after the fault at both ends of the line. This scheme can not only realize the accurate location of fault zone, but also reduce the traffic of distribution network to a certain extent. Finally, the scheme of distribution network protection based on "adequate" directional protection is summarized, and its structure and flow are analyzed in detail. The model of distribution network with DG is established on Matlab/Simulink platform, and its dynamic simulation is carried out. Combined with theoretical analysis and simulation, the conclusion shows that the scheme has a strong adaptability to different fault types of distribution network, and can quickly and accurately remove the distribution network faults.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TM77

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本文編號(hào)：1795959