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P. 120
[16] 夏超英.现代控制理论[M].北京:科学出版社,2012.
[17] 杨秀维,俞晓东,张健.水电站引水 发 电 系 统 小 波 动 Ⅰ 区 失 稳 机 理 研 究 [J].水 力 发 电 学 报,2020,39
(1):44 - 52.
Researchoncouplingoscillationcharacteristicsofthehydroelectric
generatingsystem ofthehydropowerstationwithsurgetank
1,2
2
LIUYi ,YUXiaodong,ZHANGJian 1,2
(1.CollegeofEnergyandElectricalEngineering,HohaiUniversity,Nanjing211100,China;
2.CollegeofWaterConservancyandHydropowerEngineering,HohaiUniversity,Nanjing210098,China)
Abstract:Thehydroelectricgeneratingsystemofthehydropowerstationwithsurgetankisacomplexhydro - me
chanical - electriccouplingsystem.However,theoscillationcharacteristicsofthecouplingsystemandthecoupling
relationshipbetweenthesubsystemshavenotbeenclarified.Inthispaper ,thewholehydropowerstationsystemis
dividedintotheheadracetunnel - surgetanksubsystemandthepenstock - unitsubsystem.Basedonthestabilityof
penstock - unitsubsystem ,thecouplingoscillationdomainisproposed,anditsanalyticalformulaisderived.Based
oneigenvalueanalysisandnumericalsimulation ,theoscillationcharacteristicsofthecouplingsystemarestudied.
Theamplitude - frequencycharacteristicsandinteractionbetweenthetwosubsystemsareinvestigatedbyfrequency -
domainanalysis.Thequantitativeindexformeasuringthestabilityofthecouplingsystemisproposed.Theresults
showthatwhenthegovernorparametersaresetoutsidethecouplingoscillationdomain,thehydropowersystem is
unstable.Therefore ,thegovernorparameterssetinthecouplingoscillationdomainisanecessaryconditionforthe
stabilityofthewholehydropowerstationsystem.Thestabilityofthecouplingsystemisdeterminedbythelowfre
quencyoscillationmodewhenthegovernorparametersaresetinthecouplingoscillationdomain.Bysubstitutingthe
frequencyofthelowfrequencyoscillationmodeintotheproductoftheamplitude - frequencycharacteristicfunctions
ofthetwosubsystems ,theoscillationsuperpositionratecanbeobtained.Theoscillationsuperpositionratereflects
thegainvalueofthesystemdisturbanceintheclosed - loopsystem ,whichhasclearphysicalmeaning.Whenthe
oscillationsuperpositionrateislessthan1 ,thedisturbedsystemtendstobestable.Theresearchresultsnotonly
enrichthetheoreticalsystem ofhydraulictransitionprocess ,butalsohavegoodengineeringapplicationvaluefor
improvingtheoperationstabilityofhydropowerstation.
Keywords:hydropowerstation;transitionprocess;surgetank;couplingoscillation;stability
(责任编辑:王 婧)
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