本文選題：微網(wǎng)　切入點(diǎn)：分布式發(fā)電　出處：《華中科技大學(xué)》2014年碩士論文

【摘要】：現(xiàn)如今，環(huán)境問(wèn)題和能源問(wèn)題越來(lái)越凸顯，開(kāi)發(fā)清潔可再生能源資源已經(jīng)成為各國(guó)經(jīng)濟(jì)及社會(huì)可持續(xù)發(fā)展的重要戰(zhàn)略。微網(wǎng)可以降低饋線損耗、增加本地供電可靠性、提高能源利用的效率，越來(lái)越受到各國(guó)的重視。但是微網(wǎng)由于接入了多個(gè)儲(chǔ)能裝置和分布式發(fā)電，使配電系統(tǒng)的故障特征發(fā)生改變，故障后電氣量的變化變得非常復(fù)雜，影響了傳統(tǒng)的保護(hù)原理和故障檢測(cè)方法，可能導(dǎo)致故障位置無(wú)法準(zhǔn)確定位。因此對(duì)配電網(wǎng)的保護(hù)進(jìn)行重新配置是微網(wǎng)大量應(yīng)用的關(guān)鍵。 微網(wǎng)由分布式電源、負(fù)荷、儲(chǔ)能裝置和控制裝置構(gòu)成，它有兩種運(yùn)行模式，即并網(wǎng)運(yùn)行和離網(wǎng)運(yùn)行。本文首先分析了微網(wǎng)的控制模式及微網(wǎng)在并網(wǎng)和離網(wǎng)兩種運(yùn)行模式下DG逆變器的控制模式，并網(wǎng)運(yùn)行時(shí)，微網(wǎng)內(nèi)的各個(gè)DG逆變器的控制一般采用P/Q控制方式。離網(wǎng)運(yùn)行時(shí)，微網(wǎng)內(nèi)部需要某個(gè)或者某幾個(gè)DG采用U/f和Droop控制策略來(lái)保持電壓和頻率的額定值。據(jù)此建立微網(wǎng)并網(wǎng)運(yùn)行時(shí)逆變型DG的等效模型，在分析常規(guī)配電網(wǎng)結(jié)構(gòu)和繼電保護(hù)配置的基礎(chǔ)上在PSCAD/EMTDC中建立了含微網(wǎng)的配電系統(tǒng)的仿真模型。然后在分析DG故障特性的基礎(chǔ)上，詳細(xì)分析了微網(wǎng)對(duì)常規(guī)配電網(wǎng)繼電保護(hù)的影響，包括引起保護(hù)誤動(dòng)、拒動(dòng)，靈敏性降低以及對(duì)重合閘的影響等。最后提出了一種基于通信的繼電保護(hù)配置方案，并考慮了重合閘裝置，利用在PSCAD/EMTDC中建立的仿真模型，驗(yàn)證了繼電保護(hù)新方案的有效性。
[Abstract]:Nowadays, environmental and energy problems are becoming more and more prominent, and the development of clean and renewable energy resources has become an important strategy for the sustainable development of economy and society.Microgrid can reduce the loss of feeder, increase the reliability of local power supply and improve the efficiency of energy utilization.However, due to the access of multiple energy storage devices and distributed generation, the fault characteristics of the distribution system are changed, and the change of electrical quantity becomes very complicated after the fault, which affects the traditional protection principle and fault detection method.The fault location may be unable to locate accurately.Therefore, reconfiguration of distribution network protection is the key to a large number of microgrid applications.The microgrid is composed of distributed power source, load, energy storage device and control device. It has two operation modes, that is, grid-connected operation and off-grid operation.In this paper, we first analyze the control mode of microgrid and the control mode of DG inverter in grid-connected and off-grid mode. In grid-connected operation, the control mode of DG inverter in microgrid is generally P / Q control mode.In off-grid operation, one or more DGs are required to maintain the voltage and frequency ratings by using U- / f and Droop control strategies.On the basis of this, the equivalent model of the inverter DG is established. Based on the analysis of the conventional distribution network structure and relay protection configuration, the simulation model of the distribution system with microgrid is established in PSCAD/EMTDC.Then, based on the analysis of DG fault characteristics, the influence of microgrid on the relay protection of conventional distribution network is analyzed in detail, including the maloperation of protection, the rejection of protection, the reduction of sensitivity and the influence on reclosure.Finally, a relay protection configuration scheme based on communication is proposed, and the reclosing device is considered. The effectiveness of the new scheme is verified by using the simulation model established in PSCAD/EMTDC.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM77

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 蔡淵;;含微電網(wǎng)的配電網(wǎng)系統(tǒng)結(jié)構(gòu)及功能研究[J];電網(wǎng)與清潔能源;2013年01期

2 尚th;邰能靈;劉琦;蘭森林;唐躍中;陸昱;;考慮分布式電源的配電網(wǎng)保護(hù)改進(jìn)方案研究綜述[J];電力系統(tǒng)保護(hù)與控制;2012年24期

3 徐金雄;張雙平;王帥;;微型電網(wǎng)關(guān)鍵技術(shù)及研究應(yīng)用概況[J];電氣開(kāi)關(guān);2010年03期

4 李斌;于絢;薄志謙;Andrew KLI MEK;;含分布式電源的閉環(huán)配電網(wǎng)保護(hù)方案(英文)[J];電力系統(tǒng)自動(dòng)化;2010年07期

5 王成山;李鵬;;分布式發(fā)電、微網(wǎng)與智能配電網(wǎng)的發(fā)展與挑戰(zhàn)[J];電力系統(tǒng)自動(dòng)化;2010年02期

6 王成山;楊占剛;王守相;車延博;;微網(wǎng)實(shí)驗(yàn)系統(tǒng)結(jié)構(gòu)特征及控制模式分析[J];電力系統(tǒng)自動(dòng)化;2010年01期

7 朱玲玲;李長(zhǎng)凱;張華中;周培毅;;含分布式電源的配電網(wǎng)方向過(guò)流保護(hù)[J];電網(wǎng)技術(shù);2009年14期

8 王成山;肖朝霞;王守相;;微網(wǎng)綜合控制與分析[J];電力系統(tǒng)自動(dòng)化;2008年07期

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

10 謝昊;夏冬平;盧繼平;;距離保護(hù)在具有分布式電源的配電網(wǎng)系統(tǒng)中的應(yīng)用[J];電氣應(yīng)用;2006年12期

相關(guān)博士學(xué)位論文 前1條

1 高菲;交流型分布式電源及微網(wǎng)系統(tǒng)模型分析與暫態(tài)仿真[D];天津大學(xué);2012年

，

本文編號(hào)：1700121