AC Vs. DC nyob rau hauv cov vaj tse nyob nrog lub hnub ci-ntxiv-sau

Cov kws tshawb fawb los ntawm Chalmers University of Technology hauv Sweden tau muab piv rau lub zog txuag hluav taws xob ntawm kev hloov pauv tam sim no (AC) thiab cov khoom siv hluav taws xob ncaj qha (DC) rau cov tsev nyob nruab nrog PV thiab cov roj teeb cia. Tshwj xeeb, lawv tau saib seb qhov kev teeb tsa DC tuaj yeem ua rau txo qis zog.

"Ib yam uas tau los ntawm kev ua haujlwm yog tias peb tuaj yeem nthuav tawm cov qauv kev poob-txuag nrog DC faib rau huab cua Nordic nrog - qhov nruab nrab - qis qis dua," tus kws tshawb fawb Patrik Ollas hais.pv magazine. "Tsis tas li ntawd, cov txiaj ntsig - thiab qhov tsim nyog ua pov thawj - ntawm PV thiab roj teeb cia kom ua tiav kev txuag hluav taws xob nrog DC."

Rau lawv cov kev soj ntsuam ntawm kev ua tau zoo txhua hnub thiab caij nyoog ntawm ob lub topologies, cov kws tshawb fawb tau siv cov ntaub ntawv puv xyoo ntawm kev siv cov khoom siv, PV tiam, kev ua haujlwm ntawm cov khoom siv hluav taws xob hloov hluav taws xob (PECs), thiab roj teeb cia. Lawv suav hais tias AC thiab DC teeb tsa rau lub tsev nrog rau sab qab teb-taw qhia txog 3.6 kW hnub ci-ntxiv-kho-tso installation ntawm lub kaum sab xis ntawm 45 degrees. Lawv xav tias lub tsev muaj qhov chaw thiab cov dej kub hauv tsev los ntawm cov twj tso kua mis hauv av.

"Kev ntsuas tus kheej tau txais rau cov khoom siv hauv qab no: lub tshuab hluav taws xob hauv av, qhov cua, cov twj tso kua mis, thiab PV tiam," cov kws tshawb fawb tau hais tias, sau tseg tias qhov kev thov txhua xyoo yog 6,354 kWh, nrog PV tsim 3,113 kWh. "Qhov kev tshawb fawb no tau ua rau lub tsev sib txuas sib txuas; ib qho kev hloov pauv AC / DC bidirectional xav tau rau kev sib cuam tshuam hauv kab sib chaws."

Kev ua haujlwm tau txiav txim siab plaub qhov kev sib txawv ntawm cov txheej txheem: AC-230 VAC nrog kev ua haujlwm ntawm kev thauj khoom, DC1-380 VDC nrog kev ua haujlwm ntawm kev thauj khoom, DC2-380 VDC nrog kev hloov pauv ruaj khov, thiab DC3-380 thiab 20 VDC nrog kev ua haujlwm ntawm kev thauj khoom.

"Ib theem 20 VDC sub-voltage tau ntxiv rau DC1 thiab DC2 los muab cov khoom me me thiab teeb pom kev zoo los ntawm lub hauv paus DC / DC converter," hais tias pab pawg tshawb fawb.

Lawv pom tias cov kev hloov pauv bidirectional poob qhov sib txawv thaum ua qauv nrog cov yam ntxwv ruaj khov thiab kev ua haujlwm ntawm kev ua haujlwm. Lawv kuj pom tias DC topology tuaj yeem ua tiav kev txuag hluav taws xob txawm tias tsis suav nrog PV lossis roj teeb cia.

Lawv hais tias "Qhov kev poob ntawm cov kab sib txuas sib txuas siv qhov kev ua tau zoo tas mus li (DC2) yog 34 feem pua ​​​​qis dua li cov hauv cov ntaub ntawv siv cov khoom siv hluav taws xob (DC1)," lawv hais. "Qhov kev ua tau zoo ntawm cov kab ke (AC thiab DC1-3) yog 95.3, 94.3, 95.8, thiab 93.7 feem pua."

Cov pab pawg tau xaus lus tias DC teeb tsa tsis tau nthuav tawm qhov kev xaiv zoo nyob rau hauv cov nqe lus ntawm kev poob qis yam tsis muaj kev suav nrog PV thiab roj teeb.

"Nyob rau hauv cov ntsiab lus ntawm kev tshawb fawb ntau dua, qhov yuam kev ntawm kev siv cov txiaj ntsig tas li rau ob lub roj teeb thiab lub zog hluav taws xob hloov hluav taws xob tau hais txog," Ollas xaus lus. "Tsis tas li ntawd, qhov kev txuag nyiaj tseem ceeb tshaj plaws tau txais thaum PV fais fab tau pub rau cov khoom thauj ncaj qha lossis los ntawm cov roj teeb cia. Kuv lees paub tias DC kev faib khoom hauv tsev yog daim ntawv thov niche thiab raug ntes hauv Catch-22 qhov xwm txheej hais txog kev muab khoom ntawm Txawm li cas los xij, qee qhov xwm txheej tshwj xeeb tuaj yeem nthuav dav rau qhov no, piv txwv li hauv DC daim phiaj nrog PV, roj teeb thiab EV sib txuas thiab cov tsev ua haujlwm nrog kev sib raug zoo ntawm PV thiab kev thov. "

Cov kws tshawb fawb tau nthuav tawm lawv qhov kev tshawb pom hauv "Kev txuag hluav taws xob siv hluav taws xob tam sim no nyob rau hauv lub tsev nyob nrog hnub ci Photovoltaic thiab roj teeb cia," uas nyuam qhuav luam tawm hauvZog.