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                         Studyondynamiccharacteristicsofphasemodulation - generationtransition
                              processoffixed - speedandvariable - speedpumped - storageunits

                      CHENDiyi,LIUGongcheng,LIANGXiao,DENGYuwen,HUKuangqing,XUBeibei
                        (CollegeofWaterResources&ArchitecturalEngineering,NorthwestA&FUniversity,Yangling 712100,China)

                  Abstract:Variable - speedpumpedstorage,asarelativelynewform ofunit,hasuniqueadvantagesovertradi
                  tionalfixed - speedunitsinparticipatinggridphaseregulationandpowerregulation.Asatypicaltransitionprocess
                  forhydropowerunitstocopewithfluctuationsinintermittentrenewableenergysourcessuchaswindpowerandpho
                  tovoltaic ,phaseregulation - generationhasasignificantimpactonpressurefluctuationsinflow - passingpartsand
                  thestabilityofunit.Theschemeofasinglepenstockfeedingmultiplepumpturbineswidelyusedincurrentpumped
                  storagepowerplantshasthephenomenonofhydraulicinterference ,andthechangeofoneunit’sworkingcondition
                  willaffecttheoperationofotherunits.Meanwhile ,usingthevariablespeedunitsmaycausethehydraulicdynamic
                  characteristicsoftheunitsdifferentfrom thoseofthetraditionalunits.Todeeplyexplorethehydraulicdynamic
                  characteristicsandrelatedstabilityissuesofcomplexpipelinesystemsunderdifferentunitarrangementsinthetran
                  sitionprocessofphasemodulation - powergeneration ,combinedwithengineeringdata,themodelofonepipeand
                  twopumpedstorageunitsunderthreedifferentunitcombinationswasbuiltbasedonthemethodsofcharacteristic
                  lineandS - function.Thedynamiccharacteristicsofhydraulicfactors,suchasvolutepressure,tailpipepressure
                  aswellassurgetankflowrate ,andtheireffectsonthestabilityofthestorageunitswerestudiedseparatelyfordif
                  ferentunitarrangementswithdifferentoperationintervals.Thequantitativeanalysisresultsshowthatunderthe
                  phasemodulation - generationcondition ,theworkingheadandvolutepressuredecreasesfirstandthenrises,and
                  thetailwaterpressure ,thewaterlevelandflowrateofthedownstreamsurgewellshowsinusoidaldampingoscilla
                  tion.Thestabilityeffectofthefixed - variable - speedunitcombinationisthebest ,andthedoublevariable - speed
                  combinationformhasthelargesthydraulicfluctuation.Thisstudyprovidescertaintheoreticalbasisforthesafeand
                  stableoperationoffixedandvariable - speedpumpedstoragepowerplants.
                  Keywords:pumpedstoragepowerstation;variablespeedpumpedstorageunit;transitionprocess;stability

                                                                                    (责任编辑:王 婧)

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