Meaning
Themostconcisedefinitionofdistributedpoweris:35kVandbelowthepowersupplythatisnotdirectlyconnectedtothecentralizedtransmissionsystem,whichmainlyincludespowergenerationequipmentandenergystoragedevices.
Advantages
(1)Economical:Becausedistributedgenerationislocatedontheusersideandclosetotheloadcenter,theconstructioncostandlossofthetransmissionanddistributionnetworkaregreatlyreduced;atthesametime,thedistributionPowergenerationplanningandconstructioncycleisshort,investmentiseffective,andinvestmentriskissmall.
(2)Environmentalprotection:Distributedpowergenerationcanmakeextensiveuseofcleanandrenewableenergy,reducingtheconsumptionoffossilenergyandtheemissionofharmfulgases.
(3)Flexibility:Distributedpowergenerationsystemsmostlyusesmallandmedium-sizedmodularequipmentwithadvancedperformance,whicharefastonandoff,convenientformaintenanceandmanagement,flexibleadjustment,andeachpowersourceisrelativelyindependent,whichcanmeetpeakshavingandfilling.Valley,powersupplyforimportantusersandotherdifferentneeds.
(4)Security:Therearevariousformsofdistributedpowergeneration,whichcanreducethedependenceonasingleenergysourceandalleviatetheexpansionoftheenergycrisistoacertainextent;atthesametime,thedistributedpowergenerationlocationisscattered,anditisnotvulnerabletoaccidentaldisasters.Ortheimpactofemergencieshasthepotentialtowithstandlarge-scaleblackouts.
Features
Distributedenergysystemsdonotsimplyusetraditionalpowergenerationtechnologies,butarebasedonnewtechnologiessuchasautomaticcontrolsystems,advancedmaterialtechnologies,andflexiblemanufacturingprocesses.Onthebasis,anewenergyproductionsystemwithlowpollutionemissions,flexibility,convenience,highreliabilityandhighefficiency.
Thepowergenerationsystemthatcomposesthedistributedenergysystemhasthefollowingcharacteristics:
①Efficientuseofwasteenergygeneratedbypowergenerationtogenerateheatandelectricity;
②On-siteRenewableenergysystem;
③Includesanenergyrecyclingsystemthatuseson-sitewastegas,wasteheatandexcesspressuretogenerateelectricity.
Classification
DistributedGeneration(DG)devicescanbedividedintocogenerationpowergeneration,internalcombustionenginepowergeneration,gasturbinepowergeneration,andsmallhydropowergenerationaccordingtodifferenttechnologiesused.,Windpower,solarphotovoltaicpowergeneration,fuelcells,etc.;accordingtothetypeofenergyused,DGcanbedividedintofossilenergy(coal,oil,naturalgas)powergenerationandrenewableenergy(wind,solar,tidal,biomass,smallhydropower,etc.))Twoformsofpowergeneration.DistributedEnergyStorage(DES)devicesrefertoenergystorageandconversiondevicesthataremodular,canbequicklyassembled,andconnectedtothepowerdistributionnetwork.Accordingtodifferentformsofenergystorage,DEScanbedividedintoelectrochemicalenergystorage(suchasbatteryenergystoragedevices),electromagneticenergystorage(suchassuperconductingenergystorageandsupercapacitorenergystorage,etc.),mechanicalenergystoragedevices(suchasflywheelenergystorageandCompressedairenergystorage,etc.),thermalenergystoragedevices,etc.Inaddition,thefast-developingelectricvehiclescanalsosendelectricitytothedistributionnetworkwhenneeded,soitisalsoakindofDES.
Definition
Thedefinitionofdistributedpoweristhatitislocatedneartheuser,thegeneratedpowercanbeusedon-site,anditisconnectedtothegridatavoltagelevelof10kVandbelow,andasinglegrid-connectedpointhasatotalPowergenerationprojectswithinstalledcapacitynotexceeding6MW.Includingsolarenergy,naturalgas,biomassenergy,windenergy,geothermalenergy,oceanenergy,comprehensiveutilizationofresourcesforpowergenerationandothertypes.
Purpose
Today’sdistributedpowersourcesmainlyrefertointernalcombustionengines(IC)thatuseliquidorgasfuels,micro-turbines(Microturbines),andvariousengineeringfuelcells(FuelCell),solarpowerstations,andwindturbines.Becauseofitsgoodenvironmentalperformance,distributedpowergenerationand"smallunits"arenolongerthesameconcept.
Commonmodel
Productname | Productmodel | Productattributes |
DistributedDCpowersupply | 400W/220V/110V | |
DistributedDCpowersupply | 600W/220V/110V | |
DistributedDCpowersupply | 800W/220V/110V | |
DistributedDCpowersupply | 100W,200W.300W.500W/110V/220V |
Significance
Distributedenergycanusenaturalgas,coal-bedmethaneandotherfuels,aswellaswastegasresourcessuchasbiogas,cokeovengas,andevenwindenergy,solarenergy,andwater.Canwaitforrenewableresources.Sincedistributedenergyprojectsaremostlybuiltincities,thefuelformostdistributedenergysourcesismostlynaturalgasordiesel.Specifically,theimportanceofthedevelopmentofdistributedenergyhasthefollowingaspects:
(1)Economy
BecausethewasteheatofdistributedenergycanbeusedtogenerateelectricityHeatingandcooling,soenergycanbeusedinareasonablecascade,whichcanimprovetheefficiencyofenergyuse(upto70%-90%).Duetotheintegrationofdistributedpowersources,large-scalepowerplantsandhigh-voltagetransmissiongridshavebeenreducedorpostponed,andtheconstructionofpowergridshasbeenpostponedtosaveinvestment.Atthesametime,thepowerflowofthetransmissionanddistributionnetworkisreduced,andthenetworklossiscorrespondinglyreduced.
(2)Environmentalprotection
Becauseitusesnaturalgasasfuelorhydrogen,solarenergy,andwindenergyasenergysources,itcanreducethetotalemissionsofharmfulsubstances.Reducethepressureonenvironmentalprotection:Alargeamountofnearbypowersupplyreducestheconstructionoflarge-capacityandlong-distancehigh-voltagetransmissionlines,whichnotonlyreducestheelectromagneticpollutionofhigh-voltagetransmissionlines,butalsoreducesthelandacquisitionareaandlinecorridorsofhigh-voltagetransmissionlines.Thefellingoftreesunderthelineisconducivetoenvironmentalprotection.
(3)Diversityofenergyutilization
Distributedpowergenerationcanuseavarietyofenergysources,suchascleanenergy(naturalgas)andnewenergy(hydrogen)Andrenewableenergy(windenergyandsolarenergy,etc.),andprovideuserswithmultipleenergyapplicationssuchascold,heat,andelectricityatthesametime,soitisagoodwaytosolvetheenergycrisis,improveenergyefficiencyandenergysecurity.
(4)Peakshavingeffect
Summerandwinterareoftenthepeakperiodsofload.Atthistime,suchastheuseofnaturalgasasfuelgasturbinesandothercold,Thecombinedheatandpowersystemcannotonlysolvethecoolingandheatingneedsinwinterandsummer,butalsoprovidepartoftheelectricity,whichcanreducethepeakandfillthevalley.Inaddition,italsopartiallysolvedtheproblemofexcessivepeak-to-valleydifferenceinnaturalgassupply,andplayedacomplementaryroleinnaturalgasandelectricity.
(5)Safetyandreliability
Whenalarge-scaleblackoutoccursinalargepowergrid,aspeciallydesigneddistributedpowergenerationsystemcanstillmaintainNormaloperation,whichcanimprovethesafetyandreliabilityofpowersupply.
(6)Powermarketissues
Distributedpowergenerationcanadapttotheneedsofpowermarketdevelopment.Multiplefundsareusedtogeneratepower,andthepowerconstructionmarketcanbefullyutilized.Thecompetitionmechanismoftheelectricitysupplymarket.
(7)Investmentrisk
Theinstalledcapacityofdistributedpowergenerationisgenerallysmallandtheconstructionperiodisshort,soitcanbeavoidedSimilartotheinvestmentrisksbroughtbytheconstructioncycleoflargepowerstations.
(8)Powersupplyproblemsinremoteareas
ManyremoteandruralareasThegridsuppliespowertoit.Anindependentpowergenerationsystemusingsolarphotovoltaicpowergeneration,windpowergenerationandbiomasspowergenerationisapreferredmethod.