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1、1.25MW雙饋異步風(fēng)力發(fā)電系統(tǒng)設(shè)計(jì)學(xué)號(hào):2013210516設(shè)計(jì)題目:學(xué)生姓名:專業(yè):電氣工程及其自動(dòng)化班級(jí):電氣工程系部:電力工程系二〇一七年六月七日摘要隨著一些地區(qū)風(fēng)電供應(yīng)比例的急劇增加,大規(guī)模風(fēng)電場(chǎng)對(duì)地區(qū)電網(wǎng)穩(wěn)定性造成的影響愈發(fā)顯著。風(fēng)力發(fā)電機(jī)的低電壓穿越技術(shù)越來(lái)越受關(guān)注。文中首先介紹了低電壓穿越技術(shù)的概念、國(guó)外的相應(yīng)標(biāo)準(zhǔn),繼而分析比較了有關(guān)此技術(shù)的雙饋感應(yīng)發(fā)電機(jī)建模問(wèn)題、各種常見(jiàn)的實(shí)現(xiàn)低電壓穿越的技術(shù)手段及改進(jìn)控制策略。最后描述了具備此技術(shù)的風(fēng)電場(chǎng)對(duì)電力系統(tǒng)的影響。根據(jù)電機(jī)學(xué)中異步電機(jī)的相關(guān)知識(shí)推導(dǎo)了雙饋感應(yīng)發(fā)電機(jī)在三相靜止坐標(biāo)系下的數(shù)學(xué)模型以及運(yùn)動(dòng)方程;在對(duì)雙PWM電壓
2、型變流器原理分析基礎(chǔ)上,推導(dǎo)了網(wǎng)側(cè)PWM變流器在三相靜止坐標(biāo)系下數(shù)學(xué)模型;為了便于控制系統(tǒng)設(shè)計(jì),應(yīng)用坐標(biāo)變換技術(shù)將所建數(shù)學(xué)模型轉(zhuǎn)換到兩相旋轉(zhuǎn)坐標(biāo)系下;基于坐標(biāo)變換技術(shù)和電機(jī)矢量控制理論,進(jìn)行了電網(wǎng)電壓定向的網(wǎng)側(cè)變流器矢量控制設(shè)計(jì)和定子磁鏈定向的轉(zhuǎn)子側(cè)變流器矢量控制設(shè)計(jì)的研究;進(jìn)行了亞同步速和超同步速時(shí)電機(jī)變速恒頻發(fā)電和有功無(wú)功獨(dú)立調(diào)節(jié)的仿真研究,仿真結(jié)果表明所設(shè)計(jì)的系統(tǒng)在實(shí)現(xiàn)了變速恒頻發(fā)電的同時(shí),實(shí)現(xiàn)了P、Q的完全解耦控制,驗(yàn)證了雙饋感應(yīng)風(fēng)力發(fā)電系統(tǒng)理論分析和控制策略設(shè)計(jì)的正確性與可行性。關(guān)鍵字風(fēng)力發(fā)電;變速恒頻;雙饋發(fā)電機(jī);矢量控制IAbstractWiththerapidinc
3、reaseoftheproportionofwindpowersupplyinsomeareas,theimpactoflarge-scalewindfarmsonthestabilityofregionalpowergridisbecomingmoreandmoreobvious.Thelowvoltageridethroughtechnologyofwindturbineshasattractedmoreandmoreattention.Thispaperfirstintroducestheconceptofthecorrespondingstandard,lowvoltage
4、ridethroughtechnologyabroad,technicalmeanstorealizethelowvoltageridethroughtheanalysisandcomparisonofallkindsofdoublyfedinductiongeneratormodelingproblem,thistechniqueiscommonandimprovedcontrolstrategy.Finally,theinfluenceofwindfarmwiththistechnologyonpowersystemisdescribed.Accordingtomotorlea
5、rningrelatedknowledgeofinductionmotormathematicalmodelisdeducedinthethree-phasestaticcoordinatesystemofdoublyfedinductiongeneratorandtheequationofmotion;intheanalysisofdualPWMvoltagesourceconverterbasedontheprinciple,derivationofthegridsidePWMconverterinthethree-phasestaticcoordinatesystemmath
6、ematicalmodel;inordertofacilitatethedesignofcontrolsystem,theapplicationofcoordinatetechnologywilltransformthemathematicalmodelintothetwo-phaserotatingcoordinatesystem;coordinatetransformationtechnologyandmotorvectorcontrolbasedonthetheoryofrotorsideconvertervectorcontroldesignandthedesignofth
7、estatorfluxorientationvectorcontrolgridvoltageorientednetworksideconverter;simulatedsubsynchronousspeedandsupersynchronousspeedmotorVSCFandindependentactiveandreactivepowerregulation,simulationresultsshowthatthedesignofthesystemintherea