受端系統(tǒng)小擾動電壓穩(wěn)定問題的研究.pdf

1、華北電力大學(xué)（北京）博士學(xué)位論文受端系統(tǒng)小擾動電壓穩(wěn)定問題的研究姓名：張艷萍申請學(xué)位級別：博士專業(yè)：電力系統(tǒng)及其自動化指導(dǎo)教師：張建華黃偉20080601AbstractAstheexpansionofpowersupplydistance，theenlargementofloadcharacteristicofconstantpowertendencyaswellasthegradualadvancementofelectricpow

2、ermarketaftertheelectricpowerplantandnetworkseparate，thesefactorsmakethevoltagestabilityquestionforthelargeelectricalnetwork，especiallythereactivevoltagequestionforthereceivedsystemmoreandmoreserious，andthisinfluenceismo

3、resensitivetotheloadcenterofeconomydeveloped，populationconcentration，theenergydeficientlarge—scalecityWetaketheBeijingelectricalnetworkastheexample，whichisatypicalreceivedsystemin2005summerpeakloadpedod，thereceivedelectr

4、icityproportionoftheBeijingareanetworkfromtheoutsidegridalreadyhasachievedapproximately75％，theseriousaccidentmaybehappenedfortheelectricalnetworkifanyreceivedchannelappearsthequestionthereforeweshouldpaymoreattentiononth

5、eweaknessofreceivedsyst鋤forthemetropolisThisthesisbasedontheprojectofvoltagestabilityanalysisoftheBeijingelectricalnetworkdeeplystudiesonthesmalldisturbancevoltagestabilityquestionofthereceivedsystemthemaincontentofresea

6、rchasfollows：Althoughthestaticanalysismethodiswidelyusedinactualelectricpowersystem，therearemanyconceptsthatareunclearorevenconfusedIntheanalysisofinstabilitymechanismduetovoltage’Sdroppingmonotonously，themeaningofoperat

7、ionlimitofthestaticvoltagestabilityisthoroughlydiscussedinthisthesisKeywordsandexpressionswhichhavecomparativehiglloccurrencefrequencysuchasnetworkmaximumpowertransfercapabilitymaxinlumloadpowerpoin_t’powerflowlimitflexp

8、ointofPVcurve，singularpon0fpowerflowJacobianMatrix，saddlenodebifurcationandSOonaleanalyzed，andtheirinterrelationsarediscussedanddemonstratedIntheanalysisofstaticvoltagestabilityP—Vcurvesarise嬲allappealingmethodinpractice

9、Howevermanyscholarsbelievethatwhenloadsarenotsupposedtobeconstantpowerloads，thereisnopowerlimitconsequentlytheflexpointofP—VcurvesdoesnotcorrespondtoloadcapabilitylimitorisnolongerthecriticalpointofvoltagestabilityTheope

10、rationofpowerflowtakingaccountofthemodelofstaticcharacteristicofload，isstudieddeeplyinthisthesis，andthecharacteristicofthecriticalpointofstableoperationisanalyzed；PVcurvesunderdifferentloadindexofvoltagecharacteristicaar

11、ealsoanalyzedthephysicalmeaningsofloadflowlimit，loadcapabilitylimit，loadpowerlimitofsystemflexpointofPVcl／1wes，powerflowJacobianMatrixsingularpoints，and也eifinterrelationsarediscussedundernon—constantpowerloads，theeffects