本文選題：微網(wǎng) + 電磁暫態(tài)��； 參考：《安徽工程大學(xué)》2016年碩士論文

【摘要】：在世界各地,傳統(tǒng)電力系統(tǒng)正面臨著化石能源的枯竭、能源轉(zhuǎn)化效率地下以及生態(tài)環(huán)境污染的問題。微網(wǎng)是一種將不同的分布式電源、儲(chǔ)能裝置、負(fù)荷聯(lián)系起來的主動(dòng)配電網(wǎng),能夠進(jìn)行孤島和并網(wǎng)雙模式的運(yùn)行以及相互的切換。微電源大都是一些可再生能源構(gòu)成,這些可再生能源主要包括天然氣、沼氣、風(fēng)力發(fā)電、太陽(yáng)能光伏電池、燃料電池等等。對(duì)這些微電源的特性分析是實(shí)現(xiàn)控制目標(biāo)的前提。在微網(wǎng)中,不同的控制策略對(duì)微電源的輸出有不同的影響,這些控制策略主要包括恒壓恒頻控制、恒功率控制、下垂控制。本文主要對(duì)光伏微電源、蓄電池儲(chǔ)能的結(jié)構(gòu)及工作原理進(jìn)行研究分析,進(jìn)而對(duì)微電源、儲(chǔ)能裝置進(jìn)行數(shù)學(xué)建模,最后構(gòu)建了微電網(wǎng)模型。本文利用仿真軟件分析了微網(wǎng)三相短路故障及不對(duì)稱短路故障下電壓電流變化情況,為微網(wǎng)研究提供了理論上的支持。本文進(jìn)行了如下方面的工作：首先,本文對(duì)光伏微電源及其逆變器模型、儲(chǔ)能模型進(jìn)行了數(shù)學(xué)建模,進(jìn)而建立了微網(wǎng)模型。其次,本文依據(jù)三相短路故障理論,即系統(tǒng)發(fā)生三相短路故障時(shí),采用正序網(wǎng)絡(luò)圖進(jìn)對(duì)三相短路故障電壓電流進(jìn)行計(jì)算分析,利用仿真軟件對(duì)微電源進(jìn)行三相短路故障研究,仿真結(jié)果表明：故障切除后,微電源采取恒壓恒頻控制,進(jìn)入孤島運(yùn)行時(shí)電壓突變較大,諧波較多,說明采取恒壓恒頻策略并不能有效地對(duì)電壓突變進(jìn)行抑制；故障切除后恒功率控制的微電源與儲(chǔ)能裝置繼續(xù)并網(wǎng)運(yùn)行時(shí)電壓突變小,諧波較少,可以發(fā)現(xiàn)帶上儲(chǔ)能裝置能夠在一定程度上改善電壓的突變情況和對(duì)電壓的諧波抑制能力有所提升。最后,本文基于不對(duì)稱短路故障理論,即根據(jù)不對(duì)稱短路故障時(shí)的邊界條件可以得到兩相短路,單相接地短路和兩相接地短路的復(fù)合序網(wǎng)絡(luò)圖,利用復(fù)合序網(wǎng)絡(luò)圖對(duì)不對(duì)稱短路故障下的電壓電流進(jìn)行計(jì)算分析。利用仿真軟件對(duì)微電源進(jìn)行不對(duì)稱短路故障仿真,由仿真結(jié)果可以驗(yàn)證相間短路故障時(shí)的短路電流最大,可知相間短路對(duì)電網(wǎng)和負(fù)荷威脅最高。不對(duì)稱短路故障的研究為微網(wǎng)電能質(zhì)量理論研究提供了支持,為微網(wǎng)保護(hù)提供了理論依據(jù)。
[Abstract]:All over the world, the traditional power system is facing the problems of fossil energy depletion, energy conversion efficiency underground and ecological environment pollution. Microgrid is an active distribution network which connects different distributed power sources, energy storage devices and loads, and can operate and switch with each other in isolated and grid-connected mode. Micro power sources are mostly composed of renewable energy sources, such as natural gas, biogas, wind power, solar photovoltaic cells, fuel cells and so on. The analysis of the characteristics of these micro-power sources is the premise to achieve the control objectives. In microgrid, different control strategies have different effects on the output of micro-power supply. These control strategies mainly include constant voltage and constant frequency control, constant power control and droop control. In this paper, the structure and working principle of photovoltaic micro-power supply and storage battery are studied and analyzed, and then the mathematical model of micro-power supply and energy storage device is established. Finally, the micro-grid model is constructed. In this paper, the variation of voltage and current in microgrid three-phase short-circuit fault and asymmetric short-circuit fault is analyzed by using simulation software, which provides theoretical support for microgrid research. The work of this paper is as follows: firstly, the model of photovoltaic micro-power supply and its inverter and the model of energy storage are modeled by mathematics, and then the model of micro-grid is established. Secondly, according to the theory of three-phase short-circuit fault, that is, when the system occurs three-phase short-circuit fault, the voltage and current of three-phase short-circuit fault are calculated and analyzed by using positive sequence network diagram, and the three-phase short-circuit fault of micro-power supply is studied by simulation software. The simulation results show that the micro-power supply adopts constant voltage and constant frequency control after fault removal, the voltage mutation is larger and the harmonics are more when entering the isolated island, which indicates that the constant voltage and constant frequency strategy can not effectively suppress the voltage mutation. After the fault is removed, the constant power controlled micro-power supply and the energy storage device continue to run in grid-connected operation. The voltage mutation is small and the harmonics are less. It can be found that the energy storage device can improve the voltage mutation and harmonic suppression ability to some extent. Finally, based on the theory of asymmetric short-circuit fault, the complex sequence network diagram of two-phase short-circuit, single-phase grounding short-circuit and two-phase earthing short-circuit can be obtained according to the boundary conditions of asymmetric short-circuit fault. The voltage and current under asymmetric short circuit fault are calculated and analyzed by using compound sequence network diagram. Using the simulation software to simulate the asymmetric short-circuit fault of the micro-power supply, the simulation results can verify that the short-circuit current of the inter-phase short-circuit fault is the largest, and the threat of the inter-phase short-circuit to the power network and load is the highest. The research of asymmetric short circuit fault provides the support for the research of microgrid power quality theory and provides the theoretical basis for microgrid protection.
【學(xué)位授予單位】：安徽工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TM713

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 劉丙江;短路故障淺析[J];大眾用電;2003年01期

2 劉文林 ,王俊榮;挑擔(dān)燈校驗(yàn)法排除短路故障[J];農(nóng)村電工;2004年03期

3 曹國(guó)臣,焦振友;計(jì)算線路斷相加短路故障的新方法[J];電力系統(tǒng)自動(dòng)化;1993年08期

4 張錦;短路故障快速排除一法[J];農(nóng)村百事通;2001年02期

5 張小方;吳波;;農(nóng)村低壓線路短路故障快速排除方法[J];農(nóng)村電工;2012年04期

6 徐斐;馬振亮;徐新民;;一種電網(wǎng)短路故障快速隔離方法[J];科技通報(bào);2012年09期

7 李勇;魏偉;;配電網(wǎng)短路故障特征的快速傅里葉分析[J];煤礦機(jī)械;2013年10期

8 祝成虎;一種短路故障快速排除方法[J];電氣時(shí)代;2000年06期

9 張錦;短路故障快速排除一法[J];農(nóng)村電工;2000年12期

10 邱濤文;;基于配網(wǎng)通信與線路拓?fù)潢P(guān)聯(lián)的配網(wǎng)短路故障瞬時(shí)處理研究[J];高科技與產(chǎn)業(yè)化;2010年05期

相關(guān)會(huì)議論文 前1條

1 朱黎;宋興京;紀(jì)永新;姚軍;;三起蝙蝠短路故障的原因分析及對(duì)策[A];華東六省一市電機(jī)（電力）工程學(xué)會(huì)輸配電技術(shù)研討會(huì)2006年年會(huì)論文集[C];2006年

相關(guān)重要報(bào)紙文章 前2條

1 張國(guó)光;短路故障的預(yù)防[N];中國(guó)安全生產(chǎn)報(bào);2005年

2 韓瑞功 孫學(xué)英;照明電路短路故障的產(chǎn)生及排除[N];山東科技報(bào);2001年

相關(guān)碩士學(xué)位論文 前6條

1 沈宗明;微電網(wǎng)建模與短路故障特性仿真分析[D];安徽工程大學(xué);2016年

2 張笑;配電網(wǎng)短路故障計(jì)算方法研究[D];鄭州大學(xué);2010年

3 胡冠中;變壓器繞組內(nèi)部短路故障的數(shù)值模擬方法研究[D];浙江大學(xué);2006年

4 盛爽;基于相分量法的配電系統(tǒng)短路故障分析研究[D];天津大學(xué);2010年

5 黃暉;ITER極向場(chǎng)電源的仿真分析及短路故障問題研究[D];合肥工業(yè)大學(xué);2008年

6 周學(xué)治;電氣間歇短路故障火花的監(jiān)測(cè)及定位研究[D];中國(guó)礦業(yè)大學(xué);2014年

，

本文編號(hào)：1910382