Standalone hybrid generation system for the remote area of Thar, Pakistan
Fig. 2.42 Block representation of the solar cell
The output current I is
5.1
Where: -
•
Ir is the irradiance (light intensity) in W/m2 falling on the cell.
•
Iph0 is the measured solar-generated current for the irradiance Ir0.
•
Is is the saturation current of the first diode.
•
Is2 is the saturation current of the second diode.
•
Vt is the thermal voltage, kT/q, where:
k is the Boltzmann constant.
T is the device operating temperature parameter value.
q is the elementary charge on an electron.
•
N is the quality factor (diode emission coefficient) of the first diode.
•
N2 is the quality factor (diode emission coefficient) of the second diode.
•
V is the voltage across the solar cell electrical ports.
The quality factor varies for amorphous cells, and is typically 2 for polycrystalline cells.
The block lets you choose between two models:
An 8-parameter model where the preceding equation describes the output current and a 5-parameter
model that applies the following simplifying assumptions to the preceding equation:
•
The saturation current of the second diode is zero.
•
The impedance of the parallel resistor is infinite.
If you choose the 5-parameter model, you can parameterize this block
in terms of the preceding
equivalent circuit model parameters or in terms of the short-circuit current
and open-circuit voltage
the block uses to derive these parameters.
All models adjust the block resistance and current parameters as a function of temperature.