Päikeseelektrijaama kaabelduse kao analüüs
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Kuupäev
2013
Kättesaadav alates
ainult raamatukogus, only in library
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
Antud töö käigus koostati päikeseelektrijaama kaabelduse kadude arvutusmudel.
Arvutusmudel koosneb kahest osast: esiteks on arvutused maksimaalse võimsuse ja
väljundpinge juures, teiseks on arvutused kahel erineval tasemel. Esimene tase on
päikesepaneelist ühenduskarbini ja teine tase ühenduskarbist inverterini.
Arvutusmudel kuvab kaabelduse kadude arvutustulemused tundide lõikes, kogu
aasta kohta. Kasutatakse 2004. aasta päikesekiirguse ja välistemperatuuride andmeid.
Sisendparameetritena kasutatakse päikeseelektrijaama koosseisu kuuluvate
seadmete tehaseandmeid, millede kaudu arvutatakse välja tööpunkti pinged kogu aasta
kohta. Kaablite puhul on valikus erinevad ristlõiked, millede vahel valiku tegemine annab
arvutusteks vajaliku takistuse, mis omakorda arvutatakse ümber välistemperatuurile
vastavaks. Tähtis on teada ka kaabelduse pikkust ja süsteemi tootlikkust iga tunni kohta
eraldi.
Väljundparameetriteks on välistemperatuurile vastav kogu kaabelduse takistus,
esimese taseme pingelang ja kaabelduse võimsuskadu. Viimane summeeritakse kogu aasta
kohta eraldi real. Kogukadu tuuakse välja ka aastase kaabelduse kao graafikul.
Arvutusmudel annab küllaldase ülevaate päikeseelektrijaama kaabeldusega seotud
parameetritest ja on lihtsasti kasutatav. Sisendparameetrite muutmisega on soovitud
tulemuste saamine lihtsati saavutatav.
The purpose of this thesis was to compose a computational model in Microsoft Excel that would find the loss of energy in the wiring of a photovoltaic installation. The computational model for wiring is only a part of the model, which is calculated beforehand for the whole output of the installation. The computational model is required to optimize the wiring, so it would be possible to avoid voltage drop in the installation output and to avoid unreasonable financial loss due to the use of oversized cables. The calculations will be conducted throughout the year, with one hour accuracy. Firstly, one finds the summed resistance of the wiring according to outer temperatures, secondly the corresponding voltage drop and finally the loss of electricity in the wiring in watts. The annual loss is summed and and projected on a graph. The parameters inserted are the number of photovoltaic arrays, maximum power, open source voltage, working point voltage, maximum DC voltage, PV system load and the resistance of the cable. The following computational model can be used in the designing of photovoltaic installations to simplify the process. The model will give a relatively easy and comprehensive overview of electrical loss in wiring when using cables with different lengths and diameters in photovoltaic installations.
The purpose of this thesis was to compose a computational model in Microsoft Excel that would find the loss of energy in the wiring of a photovoltaic installation. The computational model for wiring is only a part of the model, which is calculated beforehand for the whole output of the installation. The computational model is required to optimize the wiring, so it would be possible to avoid voltage drop in the installation output and to avoid unreasonable financial loss due to the use of oversized cables. The calculations will be conducted throughout the year, with one hour accuracy. Firstly, one finds the summed resistance of the wiring according to outer temperatures, secondly the corresponding voltage drop and finally the loss of electricity in the wiring in watts. The annual loss is summed and and projected on a graph. The parameters inserted are the number of photovoltaic arrays, maximum power, open source voltage, working point voltage, maximum DC voltage, PV system load and the resistance of the cable. The following computational model can be used in the designing of photovoltaic installations to simplify the process. The model will give a relatively easy and comprehensive overview of electrical loss in wiring when using cables with different lengths and diameters in photovoltaic installations.
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