pvpumpingsystem.pvpumpsystem.function_i_from_v

pvpumpingsystem.pvpumpsystem.function_i_from_v(V, I_L, I_o, R_s, R_sh, nNsVth, M_s=1, M_p=1)

Deprecated: ‘function_i_from_v’ deprecated. Use pvlib.pvsystem.i_from_v instead

Function I=f(V) coming from equation of Single Diode Model with parameters adapted to the irradiance and temperature.

The adaptation of the 5 parameters from module parameters to array parameters is made according to [1].

Parameters:
  • V (numeric) – Voltage at which the corresponding current is to be calculated in volt.
  • I_L (numeric) – The light-generated current (or photocurrent) in amperes.
  • I_o (numeric) – The dark or diode reverse saturation current in amperes.
  • nNsVth (numeric) – The product of the usual diode ideality factor (n, unitless), number of cells in series (Ns), and cell thermal voltage at reference conditions, in units of V.
  • R_sh (numeric) – The shunt resistance in ohms.
  • R_s (numeric) – The series resistance in ohms.
  • M_s (numeric) – The number of module in series in the whole pv system. (= modules_per_strings)
  • M_p (numeric) – The number of module in parallel in the whole pv system. (= strings_per_inverter)
Returns:

Output current of the whole pv source, in A.
Return type:

numeric

Notes

According to the speed of the computations, it seems that the complexity of this function is cubic O(n^3), and therefore it takes too much time to compute this way for long vectors (around 45min for 8760 elements).

Different from pvsystem.i_from_v because it includes M_s and M_p, so it gives the corresponding current at the output of the array, not only the module.

References

[1] Petrone & al (2017), “Photovoltaic Sources Modeling”, Wiley, p.5.
URL: http://doi.wiley.com/10.1002/9781118755877