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Smallfluctuationstabilityanalysisofpumpedstoragepowerstationwith
doublesurgechambersbasedoneigenvalueanalysis
1
1
1
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GONGTao,ZHANGJian,GONGYibin,CHENSheng,LIUYi
(1.CollegeofWaterConservancyandHydropowerEngineering,HohaiUniversity,Nanjing 210098,China;
2.KunshanKunchengDrainageEngineeringCo.,Ltd,Suzhou 215300,China)
Abstract:Inordertostudythesmallfluctuationstabilityofthewatertransmissionandpowergenerationsystemof
pumpedstoragepowerstationwithupstreamanddownstreamdoublesurgechambers,thestatematrixequationde
scribingthesystemstabilitywasestablishedbasedonthestatespacemethod.Thecorrespondingrelationshipbe
tweentheeigenvaluesandthestatevariableswasobtainedbythecorrelationfactoranalysismethod,andthesmall
fluctuationoscillationstabilityofthesystemwasanalyzedbythematrixeigenvalues.Theresultsshowthatthereare
fourpairsofconjugatecomplexrootsinthestatematrix,thatis,therearefouroscillationlinksinthesystem.The
realpartoftheconjugatecomplexrootsreflectstheattenuationtrendoftheoscillationlink ,andtheimaginarypart
reflectstheangularfrequencyoftheoscillationlink.Thewaterlevelfluctuationintheupperanddownstreamsurge
chamberscancauselow - frequencytail - waveoscillationoftheunitspeed.Increasingtheareaoftwosurgecham
berscanreducetheangularfrequencyoftail - waveoscillationandincreasetheattenuationindexoftail - waveoscil
lation ,whichisbeneficialtothestabilityoflow - frequencyoscillationofthesystem.Thesystemoscillationstability
ofsmallfluctuationsiscloselyrelatedtothegovernorparameters ,andthecombinationofsmallgovernorparameters
leadstothephasedifferencebetweenthechangeofguidevaneopeningandthechangeofpressurepipelineflow
rate ,whichisconstantlyamplifiedintheadjustmentprocessandthesystemoscillationbecomesinstability.Thein
creaseofgovernorparameterscanincreasethemainwaveoscillationattenuationindexofthespeed ,reducethe
mainwaveoscillationangularfrequency,andimprovethesystemhigh - frequencyoscillationstability.
Keywords:pumpedstoragepowerstation;upstreamanddownstream doublesurgechambers;smallfluctuation;
eigenvalue;stabilityofsystem
(责任编辑:于福亮)
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