Page 287 - Advances in Renewable Energies and Power Technologies

260 CHAPTER 8 Hybrid PV/Batteries Bank/Diesel Generator

FIGURE 8.1
Block diagram of a hybrid renewable energy system. U 1 and U 2 are switches.
2.1 PHOTOVOLTAIC CELL MODEL
Fig. 8.2 illustrates the block diagram of the two-diode nonlinear circuit used to
model the solar PV cell. The PV panel output voltage and power are related through
the following equation [8]:

P pv ¼ I cell V pv (8.1)
where V pv is the panel output voltage that is usually connected to the DC bus and I cell
is given by:

V cell þ I cell R s
¼ I ph I exp 1
I cell
01
a 1 V T1
(8.2)

V cell þ I cell R s V cell þ I cell R s
I 02 exp 1
a 2 V T2 R p

FIGURE 8.2
Circuit diagram of a two-diode model of a photovoltaic cell. G, solar radiation; I ph ,
photocurrent; R p , parallel resistance; R s , series resistance; T, ambient temperature.