Introduction
Thebatterypackisanindependentandreliableoperatingpowersource.ItisnotaffectedbytheACpowersource.Itcanstillensurecontinuousandreliableoperationeveninthecaseofapoweroutageandabusbarshort-circuitinthewholeplant..
Thebatteryvoltageisstableandthecapacityislarge.Itisnotonlysuitableforvariousmorecomplicatedrelayprotectionandautomaticdevices,butalsosuitableforthetransmissionofvariouscircuitbreakers.Therefore,large-scaleenterprisesubstationsusuallyusebatterypacksItisusedastheoperatingpowersupply,buttheoperatingpowersupplyofthebatterypackrequiresmanyauxiliaryequipmentandspecialrooms.Theinvestmentislarge,thelifeisshort,theconstructiontimeislong,theoperationiscomplicated,andthemaintenanceworkloadislarge.Therefore,thebatterypackisgenerallynotusedastheoperatingpowersupplyinsmallandmedium-sizedsubstations.,AndmostlyuserectifiedDCoperationpowersupplyorACoperationpowersupply.
Howthebatterypackworks
Batterypackshavecharging,dischargingandfloatingchargingmodes,andthefloatingchargingmodeisusuallyadopted.Becausethefloatingchargecurrentnotonlycompensatesfortheself-dischargelossofthebatterypack,butalsocancarryapartoftheDCload,sothatthebatterypackisalwaysinafullychargedstate,andonlyatthemomentofclosingcanthebatterypackprovidealargecurrent.Thisworkingmethoddoesnotrequirefrequentcharginganddischarging,prolongstheservicelifeofthebattery,andreducestheworkloadofoperationandmaintenance,soitiswidelyused.
Theinstallationofthebatterypack
Theinstallationpositionofthebatteryofthesmallphotovoltaicpowergenerationsystemshouldbeascloseaspossibletothesolarcellandthecontroller;TheinvertersandACpowerdistributioncabinetsaredividedintoseparaterooms.Theinstallationlocationshouldensuregoodventilation,convenientdrainage,andpreventhightemperature.Theambienttemperatureshouldbekeptbetween10~25℃asfaraspossible.
Insulationmeasuresshouldbetakenbetweenthebatteryandtheground,andwoodenboardsorotherinsulatorsshouldbeusedtopreventthebatteryfromshort-circuitingthegroundanddischarging.Iftherearealargenumberofbatteries,theycanbeinstalledonadedicatedbatterysupport,andthesupportmustbegroundedreliably.
Afterthebatteryisinstalled,thetotalvoltageofthebatteryandthevoltageofasinglebatteryshouldbemeasured,andthevoltageofthesinglebatteryshouldbeequal.Whenwiring,distinguishthepositiveandnegativepolestoensurethequalityofthewiring.
Thebatterypoleandthewiringmustbeinclosecontact,andalayerofpetroleumjellyoilfilmshouldbeappliedtothepoleandtheconnectionpointtopreventcorrosionandrustfromcausingpoorcontact.
Theroleofthebatterypack
Theroleofthebatterypackistostoretheelectricalenergygeneratedbythesolarcellarraywhenexposedtolightandtosupplypowertotheloadatanytime.Thebasicrequirementsofthesolarcellpowergenerationsystemforthebatterypackusedare:
①Lowself-dischargerate;
②Longservicelife;
③Strongdeepdischargecapability;
④Highchargingefficiency;
⑤Lowmaintenanceornomaintenance;
⑥Wideoperatingtemperaturerange;
⑦Lowprice.
Currently,thebatteriesusedinmycountry'ssolarcellpowergenerationsystemaremainlylead-acidbatteriesandcadmium-nickelbatteries.Forlead-acidbatteriesabove200Ah,fixedorindustrialsealedmaintenance-freelead-acidbatteriesaregenerallyused;forlead-acidbatteriesbelow200Ah,small-sizedsealedmaintenance-freelead-acidbatteriesaregenerallyused.