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% Toolbox SNL_PVLib provides a set of functions useful for modeling solar
% photovoltaic systems
% Version 1.3 Dec-2015
%% Time and Location Utilities
% pvl_date2doy - Determine day of year from year, month of year, and day of month
% pvl_doy2date - Determines the Year, Month of year, and Day of month given the year and day of year
% pvl_leapyear - Determine if a given year is a leap year using 400 year cycles
% pvl_exceltime2matlab - Convert a Microsoft Excel time to a MATLAB datenum
% pvl_matlabtime2excel - Convert a MATLAB serial datenum to a time recognizable by Microsoft Excel
% pvl_rmbtime2matlab - Creates a MATLAB datenum from the time convention used in Rocky Mountain Basic
% pvl_maketimestruct - Generate a time structure from MATLAB datenum and UTC offset code
% pvl_makelocationstruct - Create a struct to define a site location
%% Irradiance and Atmospheric Functions
% pvl_readtmy3 - Read a TMY3 file in to a MATLAB struct
% pvl_readtmy2 - Read a TMY2 file in to a MATLAB struct
% pvl_getISDdata - Fetch data from NOAA ISD at ftp.ncdc.noaa.gov
% pvl_readISH - Read data fetched from ftp.ncdc.noaa.gov into a table
% pvl_ephemeris - Calculates the position of the sun given time, location, and optionally pressure and temperature
% pvl_spa - Calculates the position of the sun given time, location, and optionally pressure and temperature
% pvl_extraradiation - Determine extraterrestrial radiation from day of year
% pvl_alt2pres - Determine site pressure from altitude
% pvl_pres2alt - Determine altitude from site pressure
% pvl_relativeairmass - Gives the relative (not pressure-corrected) airmass
% pvl_absoluteairmass - Determine absolute (pressure corrected) airmass from relative airmass and pressure
% pvl_disc - Estimate Direct Normal Irradiance from Global Horizontal Irradiance using the DISC model
% pvl_dirint - Determine DNI and DHI from GHI using the DIRINT modification of the DISC model
% pvl_louche - Determine DNI and DHI from GHI using the Louche model
% pvl_orgill_hollands - Determine DNI and DHI from GHI using the Orgill and Hollands model
% pvl_erbs - Determine DNI and DHI from GHI using the Erbs model
% pvl_reindl_1 - Determine DNI and DHI from GHI using the Reindl_1 model
% pvl_reindl_2 - Determine DNI and DHI from GHI using the Reindl_2 model
% pvl_clearsky_haurwitz - Determine clear sky GHI using the Haurwitz model
% pvl_clearsky_ineichen - Determine clear sky GHI using the Ineichen model
% pvl_calcPwat - Calculate precipitable water (cm) from ambient air temperature (C) and relatively humidity (%)
%% Irradiance Translation Functions
% pvl_grounddiffuse - Estimate diffuse irradiance from ground reflections given irradiance, albedo, and surface tilt
% pvl_isotropicsky - Determine diffuse irradiance from the sky on a tilted surface using isotropic sky model
% pvl_reindl1990 - Determine diffuse irradiance from the sky on a tilted surface using Reindl's 1990 model
% pvl_perez - Determine diffuse irradiance from the sky on a tilted surface using one of the Perez models
% pvl_kingdiffuse - Determine diffuse irradiance from the sky on a tilted surface using the King model
% pvl_klucher1979 - Determine diffuse irradiance from the sky on a tilted surface using Klucher's 1979 model
% pvl_haydavies1980 - Determine diffuse irradiance from the sky on a tilted surface using Hay & Davies' 1980 model
% pvl_getaoi - Determine angle of incidence from surface tilt/azimuth and apparent sun zenith/azimuth
% pvl_Purdue_bifacial_irradiance - Calculate the irradiance on the front and rear sides of a bifacial solar module.
% pvl_Purdue_albedo_model - Calculate the collection of ground-reflected albedo light on the rear surface of a PV module.
%% Irradiance Analysis Functions
% pvl_detect_clear_times - Identify times with GHI consistent with clear sky conditions
% pvl_detect_shadows - Identify shading on a GHI instrument from nearby structures such as wires and poles
%% Photovoltaic System Functions
% pvl_sapmmoduledb - Retrieves Sandia Array Performance Model coefficients
% pvl_SAMLibraryReader_CECModules - Open a System Advisor Model (SAM) CEC module library
% pvl_SAMLibraryReader_SNLInverters - Open a System Advisor Model (SAM) v2014.1.14 or earlier inverter library
% pvl_sapmcelltemp - Estimate cell temperature from irradiance, windspeed, ambient temperature, and module parameters (SAPM)
% pvl_iam_physical - Determine the incidence angle modifier using refractive index, glazing thickness, and extinction coefficient
% pvl_iam_ashrae - Determine the incidence angle modifier using the ASHRAE incident angle model
% pvl_iam_martinruiz - Determine the incidence angle modifier using the Martin and Ruiz incident angle model
% pvl_iam_martinruiz_components - Determine the incidence angle modifiers separately for beam, sky diffuse and ground reflected diffuse irradiance using the Martin and Ruiz incident angle model
% pvl_FSspeccorr - Calculate spectral mismatch modifier based on precipitable water and absolute airmass
% pvl_calcparams_desoto - Calculate module performance model coefficients for the De Soto single diode model
% pvl_calcparams_CEC - Create module performance model coefficients for the single diode model used by the CEC
% pvl_calcparams_PVsyst - Create module performance model coefficient for the single diode model in PVsyst version 6
% pvl_singlediode - Solves the single-diode equation to obtain a photovoltaic IV curve
% pvl_sapm - Sandia Array Performance Model to get 5 points on IV curve
% pvl_huld - Calculates DC power using the Huld PV module model
% pvl_snlinverter - Converts DC power and voltage to AC power using Sandia's Grid-Connected PV Inverter model
% pvl_adrinverter - Converts DC power and voltage to AC power using Anton Driesse's Grid-Connected PV Inverter model
% pvl_singleaxis - Determine the rotation angle of a 1 axis tracker, and sun incident angle to tracked surface
%% Functions for parameter estimation for PV module models
% pvl_huld_parameter_estimation - estimates parameters for the Huld module performance model
% pvl_PVsyst_parameter_estimation - estimates parameters for the PVsyst version 6 module performance model
% pvl_desoto_parameter_estimation - estimates parameters for the De Soto single diode module performance model
% pvl_rectify_IV_curve - ensures that Isc and Voc are included in a IV curve and removes duplicate voltage and current points
% pvl_est_diode_params_simple - estimates five parameters for an IV curve using a simplified sequential method
% est_single_diode_param - estimates five parameters for an IV curve using a regression on the co-content
% calc_theta_phi_exact - computes the arguments for the Lambert W function in the analytic solutions to the single diode equation
% update_Io_known_n - iterative update to the dark current (Io) value for an IV curve to better fit Voc
% update_Rsh_fixed_pt - iterative update to the parallel resistance (Rsh) value for an IV curve to better fit Vmp
% Schumaker_QSpline - fit a non-increasing, concave downward quadratic spline to IV curve data
%% Functions for analysis of module IV curves
% pvl_est_Rs_Bowden - estimate series resistance from IV curves using the method of Bowden and Rohatgi
% pvl_est_Rs_Swanson - estimate series resistance from IV curves using the method of Swanson
% pvl_est_Rs_Pysch - estimate series resistance from IV curves using Pysch's extension of the method of Swanson
% pvl_est_Rs_sunsVoc - estimate series resistance from IV curves using the suns-Voc method
%% Functions for translating IV curves to desired irradiance and temperature conditions
% pvl_translate_IV_curve_IEC60891_1 - translate IV curve in irradiance and temperature using method 1 in IEC60891
% pvl_est_Rs_IEC60891_1 - estimate Rs for curve translation method 1 in IEC60891
% pvl_est_kappa_IEC60891_1 - estimate kappa for curve translation method 1 in IEC60891
% pvl_translate_IV_curve_IEC60891_2 - translate IV curve in irradiance and temperature using method 2 in IEC60891
% pvl_est_Rs_IEC60891_2 - estimate Rs for curve translation method 2 in IEC60891
% pvl_est_kappa_IEC60891_2 - estimate kappa for curve translation method 2 in IEC60891
%
%% Numerical utilities
% pvl_lambertw - Compute values for the Lambert W function W(z)
% numdiff - Compute numerical derivatives for unequally spaced data
% pvl_robustfit - Robust linear regression, requires either Matlab Statistics toolbox or python installation