If you have found this difference you may want to check out the cell architectures. Crystalline silicon cells are usually p-n diodes and are modelled with two diodes to account for recombination in the bulk and in the space charge region respectively. Amorphous silicon cells are usually p-i-n diodes, which means the current transport is by drift, not diffusion, and almost the entire cell is in the space charge region. This may help select a physically sensible model, but as mentioned before bear in mind some choices of fitting functions in the literature are purely empirical.
Hi there Abdul,
I can assure you that there are a mass of PV math models orbiting the Earth over the internet. But which one to choose? That's other business indeed.
If you are just starting your modelling exercise, I can help you with sending you the code of the model I developed. Inputs: panel temperature and incoming global radiation square on the PV panel surface.
Besides this you need the panel position (lat; lon) and the geometric angles of your PV panels (unless it has tracking capability).
Just le me know whether you are interested in the PV model I developed. It is called the CV&M - PV simulator. It has been programmed in FORTRAN 77 and is based on an iterative algorithm to solve for Pmpp (Power at maximum power point) in the Voltage - Power space.
CHeers, Once compiled it crunches numbers very fast and provides power output on a minute basis.
Frank
Hi
The difference between two diode model and one diode model is in consideration of diffiusion and recommbination effect of solar cell. For better and more accurate simulation in the level of cell simulation you need to use two diode solar model which you see the effects on different conditions.
One diode solar cell neglects the recombination diode effect and the difference in Voc and Isc according to neglection of second diode would be regulated by quality factor of the first diode.
One diode model is mostly used for large scale PV simulation such as PV plants or PV generators which small effects are neglected.
Recommbination effect specially in Silicon solar cells plays important role according to physical specifications of the silicon.
Hamed
If you have found this difference you may want to check out the cell architectures. Crystalline silicon cells are usually p-n diodes and are modelled with two diodes to account for recombination in the bulk and in the space charge region respectively. Amorphous silicon cells are usually p-i-n diodes, which means the current transport is by drift, not diffusion, and almost the entire cell is in the space charge region. This may help select a physically sensible model, but as mentioned before bear in mind some choices of fitting functions in the literature are purely empirical.
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