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Short - term schedulingmethodsforpeakloadrespondingdemandofcascade
hydropowerstationsinsmallandmedium- sizedriverbasins
2
1,2
3
3
2
CHENGXiong ,CHENQingning,LIXianshan,PENGHui,ZHONGHao,LIWenwu 3
(1.HubeiProvincialKeyLaboratoryforOperationandControlofCascadedHydropowerStationsand
RenewableEnergy(ThreeGorgesUniversity),Yichang 443002,China;
2.CollegeofHydraulic&EnvironmentalEngineering,ThreeGorgesUniversity,Yichang 443002,China;
3.CollegeofElectricalEngineeringandNewEnergy,ThreeGorgesUniversity,Yichang 443002,China)
Abstract:Atpresent,duetothecharacteristicsofpoorregulationcapacity,closehydraulicconnectionsbetween
upstreamanddownstreamhydropowerstations ,anddependingonmanualadjustmenttostartorshutdownunits,
howtoformulateareasonableshort - termschedulingschemequicklybecomesthepracticalproblem facedbysuch
kindofhydropowerstationgroups.Basedontheaboveproblems,thispaperproposesashort - term scheduling
methodconsideringpeakshavingdemandforsmallandmedium - sizedhydropowerstations.Firstly ,atypicaldaily
loadcurveisredrawnintoanewloadcurvewhichissimilartotheinitialcurvebutsteadierbysubsectionmethod.
Secondly ,takingthewaterlevelofthereservoirattheendof24hoursasthecontroltarget,theimprovedsucces
siveloadsheddingmethodisadoptedtogenerateastationaryinitialoutputprocesssatisfyingtheconstraints.Third
ly ,adoptingthemodifiedstrategyofspillingwaterinsubsection,theoutputinthesectionsofspillingwaterwillbe
increasedordecreasedwithvaryingsteplengthuntilthemodificationofspillingwateriscompleted.Finally,with
theobjectiveofminimizingthemaximum residualload,theimprovedsuccessiveloadsheddingmethodandthe
modificationstrategyofspillingwaterareimplementedrepeatedlyfromupstreampowerstationstodownstreamones
untiltheerroroftheobjectivevaluemeetstheaccuracyrequirements.Themethodisappliedtosolvetheshort - term
schedulingprobleminvolvingthecascadedplantslocatedinJinxiBasinofFujianprovince ,China.Theresultsin
dicatethattheproposedmethodcanobtainamorestableoperationschemethanactualresults,effectivelyincrease
thecascadepowergenerationunderthepremiseofensuringtimeliness ,respondtothepeakshavingdemandofthe
powergridandachieveefficientutilizationofwaterresources.
Keywords:reservoiroperation;short - termpeakshaving;successiveloadshedding;benchmarkingevaluation
(责任编辑:于福亮)
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