PWM vs. MPPT Ib qho piv txwv tseem ceeb yuav piav qhia qhov no kom meej:
Cov qauv yooj yim lub cev:
Lub zog (watts)=V (Volts) x I (Amps)
Yog tias peb siv lub npe nominal 12V, 100W hnub ci vaj huam sib luag los them lub roj teeb 12V, qhov tseeb Vmp yog 17V, thiab peb tuaj yeem suav nws cov zis tam sim no:
I=Fais fab / V
Kuv=100 / 17=5.88 amps
Tam sim no peb paub lub vaj huam sib luag tso zis yog 17V thiab 5.88A.
Scenario 1: Lub kaw lus photovoltaic yog nrog PWM hnub ci nqi tswj.
PWM yuav rub qhov hluav taws xob mus rau lub roj teeb them hluav taws xob - kwv yees li 14V. Tom qab mus dhau lub PWM, lub hnub ci zog tsuas yog 14V thiab 5.88A.
Ntawd yog:
P = V x I = 14 x 5.88 = 82.32 W
Scenario 2: Lub tshuab hluav taws xob photovoltaic yog nrog MPPT lub hnub ci tus nqi tswj.
Lub MPPT tsis tsuas yog rub tawm qhov hluav taws xob mus rau 14V, tab sis kuj nce qhov tam sim no, kom lub zog yuav luag sib npaug ntawm lub zog tawm.
Yog li, yog tias qhov hluav taws xob txo qis los ntawm 17/14=1.21
Tom qab ntawd qhov tam sim no rau roj teeb nce los ntawm 1.21, peb tau txais
5.88 x 1.21 = 7.11A
Tag nrho lub zog tawm
P = 14 x 7.11 = 99.54 W
Hauv qhov piv txwv no, lub zog khib nyiab los ntawm PWM yog
99.54 – 82.32 = 17.22W
Yuav luag 20 feem pua lub zog tsis tau hloov mus rau roj teeb tshuaj lub zog. Yog tias peb xav txog qhov xwm txheej hauv lub hnub ci loj, qhov kev poob yuav zoo heev.
Yog li, nws yog qhov zoo dua los siv MPPT rau lub hnub ci loj.
