pvlib.singlediode.bishop88¶
-
pvlib.singlediode.
bishop88
(diode_voltage, photocurrent, saturation_current, resistance_series, resistance_shunt, nNsVth, d2mutau=0, NsVbi=inf, gradients=False)[source]¶ Explicit calculation of points on the IV curve described by the single diode equation [1].
Warning
- Do not use
d2mutau
with CEC coefficients. - Usage of
d2mutau
with PVSyst coefficients is required for cadmium- telluride (CdTe) and amorphous-silicon (a:Si) PV modules only.
Parameters: - diode_voltage (numeric) – diode voltages [V]
- photocurrent (numeric) – photo-generated current [A]
- saturation_current (numeric) – diode reverse saturation current [A]
- resistance_series (numeric) – series resistance [ohms]
- resistance_shunt (numeric) – shunt resistance [ohms]
- nNsVth (numeric) – product of thermal voltage
Vth
[V], diode ideality factorn
, and number of series cellsNs
- d2mutau (numeric, default 0) – PVsyst parameter for cadmium-telluride (CdTe) and amorphous-silicon (a-Si) modules that accounts for recombination current in the intrinsic layer. The value is the ratio of intrinsic layer thickness squared \(d^2\) to the diffusion length of charge carriers \(\mu \tau\). [V]
- NsVbi (numeric, default np.inf) – PVsyst parameter for cadmium-telluride (CdTe) and amorphous-silicon
(a-Si) modules that is the product of the PV module number of series
cells
Ns
and the builtin voltageVbi
of the intrinsic layer. [V]. - gradients (bool) – False returns only I, V, and P. True also returns gradients
Returns: tuple – currents [A], voltages [V], power [W], and optionally \(\frac{dI}{dV_d}\), \(\frac{dV}{dV_d}\), \(\frac{dI}{dV}\), \(\frac{dP}{dV}\), and \(\frac{d^2 P}{dV dV_d}\)
Notes
The PVSyst thin-film recombination losses parameters
d2mutau
andNsVbi
should only be applied to cadmium-telluride (CdTe) and amorphous- silicon (a-Si) PV modules, [2], [3]. The builtin voltage \(V_{bi}\) should account for all junctions. For example: tandem and triple junction cells would have builtin voltages of 1.8[V] and 2.7[V] respectively, based on the default of 0.9[V] for a single junction. The parameterNsVbi
should only account for the number of series cells in a single parallel sub-string if the module has cells in parallel greater than 1.References
[1] “Computer simulation of the effects of electrical mismatches in photovoltaic cell interconnection circuits” JW Bishop, Solar Cell (1988) DOI: 10.1016/0379-6787(88)90059-2 [2] “Improved equivalent circuit and Analytical Model for Amorphous Silicon Solar Cells and Modules.” J. Mertens, et al., IEEE Transactions on Electron Devices, Vol 45, No 2, Feb 1998. DOI: 10.1109/16.658676 [3] “Performance assessment of a simulation model for PV modules of any available technology”, André Mermoud and Thibault Lejeune, 25th EUPVSEC, 2010 DOI: 10.4229/25thEUPVSEC2010-4BV.1.114 - Do not use