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1、分類號(hào):TM744密級(jí):UDC:621.3編號(hào):201221401050河北工業(yè)大學(xué)碩士學(xué)位論文含風(fēng)電場(chǎng)電網(wǎng)的潮流計(jì)算與潮流優(yōu)化研究論文作者:王靜學(xué)生類別:全日制學(xué)科門類:工學(xué)學(xué)科專業(yè):電氣工程指導(dǎo)教師:王海濤職稱:副教授ThesisSubmittedtoHebeiUniversityofTechnologyforTheMasterDegreeofElectricalEngineeringRESEARCHONPOWERFLOWCALCULTIONANDOPTIMIZATIONOFPOWERNETWORKWITHWINDFARM
2、SbyWangJingSupervisor:ViceProf.WangHaitaoNovember2014摘要風(fēng)電因具有投資少、污染小、可再生等優(yōu)點(diǎn)受到世界各國(guó)的重視,越來越大規(guī)模風(fēng)電場(chǎng)并網(wǎng)是智能電網(wǎng)發(fā)展的主要趨勢(shì)。隨著大規(guī)模風(fēng)電場(chǎng)并網(wǎng),系統(tǒng)的結(jié)構(gòu)和運(yùn)行方式將會(huì)發(fā)生變化,原有的潮流方向和線路傳輸功率也會(huì)發(fā)生改變,將會(huì)給系統(tǒng)帶來不利的影響。而對(duì)含風(fēng)電場(chǎng)的電網(wǎng)潮流進(jìn)行研究是定量分析風(fēng)電場(chǎng)并網(wǎng)對(duì)系統(tǒng)影響的一個(gè)重要工具,因此本文對(duì)含風(fēng)電場(chǎng)電網(wǎng)的潮流計(jì)算問題進(jìn)行研究。并在此基礎(chǔ)上,對(duì)風(fēng)電場(chǎng)并網(wǎng)的潮流優(yōu)化問題進(jìn)行研究。本文主要工作如下:1
3、.建立異步風(fēng)力發(fā)電機(jī)的潮流計(jì)算模型。在潮流計(jì)算中,兩種最常用的異步風(fēng)力發(fā)電機(jī)模型是RX模型和PQ模型,也有等值成PZ模型的情況??紤]到異步發(fā)電機(jī)的等值電路,本文建立PQ??V穩(wěn)態(tài)模型。2.采用直角坐標(biāo)形式的牛頓-拉夫遜法進(jìn)行潮流計(jì)算。利用MATLAB軟件的M文件編寫潮流程序。并針對(duì)風(fēng)電場(chǎng)的不同出力水平,對(duì)系統(tǒng)進(jìn)行電壓水平、無功需求以及網(wǎng)絡(luò)損耗分析。針對(duì)風(fēng)速預(yù)測(cè)存在一定的誤差,給出系統(tǒng)可能運(yùn)行的區(qū)間范圍。3.對(duì)基本遺傳算法提出改進(jìn),然后利用改進(jìn)的遺傳算法對(duì)配電網(wǎng)無功補(bǔ)償電容器進(jìn)行了優(yōu)化。針對(duì)系統(tǒng)負(fù)荷水平和風(fēng)電場(chǎng)出力水平的變化,分
4、別進(jìn)行了優(yōu)化設(shè)計(jì)。并重點(diǎn)分析風(fēng)電場(chǎng)并網(wǎng)對(duì)配電網(wǎng)的網(wǎng)損和電壓的影響。關(guān)鍵詞:風(fēng)電場(chǎng),異步風(fēng)力發(fā)電機(jī),潮流計(jì)算,遺傳算法,潮流優(yōu)化IABSTRACTWindpowerhasbeenhighlyregardedallovertheworldbecauseofitslessinvestment,lesspollution,renewableadvantages.Connectingmoreandmorelarge-scalewindfarmstothegridisthemaintrendinthedevelopmentofthesma
5、rtgrid.Alongwithlargeamountofwindpowerintegratedintothepowersystem,thestructureandfunctionofthesystemwillvary,atthesametimetheoriginalpowerflowdirectiontrendandtransmissionpowerofthelinewillchange,whichwilldoharmtothegridsystem.Thestudyofpowernetworkpowerflowincludi
6、ngwindfarmsisanimportanttoolforquantitativeanalysisoftheinfluencecausedbywindfarmsconnectingtogridsystem.Therefore,thepowerflowcalculationofpowernetworkthatcontainswindfarmsisstudiedinthepaper.Onthebasis,theproblemaboutpowerflowoptimizationofpowernetworkwithwindfarm
7、sisstudied.Itsmajortaskisasfollows:1.Thepowerflowcalculationmodelofasynchronouswindturbinegeneratorisestablished.Inthepowerflowcalculation,therearetwomostcommonmodelsofasynchronouswindturbinegenerator,RXandPQ.Sometimes,themodelisalsotreatedasPZ.ThePQ(V)steady-statem
8、odelisestablishedwithconsideringtheequivalentcircuitofAsynchronouswindturbinegenerator.2.TherectangularformofNewton-Ralphcalculationmethod