自適應(yīng)電流速斷保護中實時計算系統(tǒng)參數(shù)的算法研究.pdf

1、三峽大學(xué)碩士學(xué)位論文自適應(yīng)電流速斷保護中實時計算系統(tǒng)參數(shù)的算法研究姓名：牛祖蘅申請學(xué)位級別：碩士專業(yè)：電力系統(tǒng)及其自動化指導(dǎo)教師：袁兆強萬均力20040301AbstractCurrentcomponents’constitutionofadaptivecurrentinstantaneoustripprotectionisbasedonfaultcomponent.Thesettingofitmuststeerbytheimbalan

2、cecurrentofcurrentcomponentinnmalconditionthenenhancethesensitivityofprotection.Faultconditioninpowersystemisviewedasconstitutionofnonfaultcomponentfaultcomponent.thisisthebasicprincipleofadaptivecurrentinstantaneoustrip

3、protection.Protectionisrealizedbypickingupneededfaultinfmationmemyusingoperationlogicaldecisionofcomputer.Voltagecurrentinprotectioninstallmentcancalculatesystemimpedancebehindprotectioninrealtime.Systemoperationconditio

4、nfaulttypecanbedeterminedbyfaultcomponentactualloadcurrentinlinecanbemeasured.Thesettingofprotectedlineisautomaticallyadjusted.Thismethodmakestheprotectionrangeofcurrentinstantaneoustripprotectioncomparativelysteady.Noma

5、tterwhatoperationconditionfaulttypethesystemmaybeprotectionequipmentcanactcrectlyemittripsignalwhenpositivedirectionfaultsoccurintherangeofprotection.Inpowersystemtheinputvoltagecurrentsignalsofprotectionequipmentsdon’tc

6、hangeinpuresine.Duetothenonlinearofferromagiccomponentsinpowersystemuseofdistributingcapacitancescapacitancesinseriesinparallelintransmissionlinesecondarysidetransientinfluenceofcurrenttransfmervoltagetransfmersoontherea

7、redecayingDCcomponentintegerharmoniccomponentsuponfundamentalwavewhenfaultshadoccurredinpowersystem.Existsofthesecomponentsgivebirthtodisturbnoisethenresultinfalseactionsonprotectionequipments.Thispaperresearchesonthealg

8、ithmofcrelativesystemparametersofadaptivecurrentinstantaneoustripprotection.InviewofdecayingDCcomponentintegerharmoniccomponentsuponfundamentalwaveallwaveFourieralgithmwithcompensationispresentedinthispaperwhenfaultsoccu

9、rinpowersystem.Thecompensatecomponentisderivedfromleastsquaremethod(LSM).Integratedsystemimpedanceiscalculatedinrealtimethentocalculateequivalenceinnerpotentialwiththemeasuredvoltagecurrentinsamplingsignalsbefefaultsoccu

10、rincomputermemy.Capabilitiesoftypicalsinglesourcedoublesourcedoublecircuitlineinsystemoperationconditionsareanalyzedwiththealgithmpresentedinthispaper.TheresultsprovethatallwaveFourieralgithmwithcompensationinthispaperca