pvl_est_Rs_Bowden

PVL_EST_RS_BOWDEN Estimate Rs using the method of Bowden and Rohatgi.

Contents

Syntax

Description:

The method of Bowden and Rohatgi estimates a value for series resistance using values from two IV curves, one under 'shaded' conditions, anticipated to be ~100 W/m2, and another at 'full-sun' conditions, anticipated to be ~1000 W/m2. The cell temperature is assumed to be the same for both IV curves. Voc and Isc from the shaded IV curve are used with Isc from the full sun IV curve to locate the desired point on the full sun IV curve. If optional arguments are provided, the difference between the returned Rs value and the Rs parameter for the single diode equation is estimated, see [2].

Inputs:

Outputs:

Example

clearvars

% Set up parameters for a representative 60 cell cSi module using the Desoto model
Const.q = 1.60218E-19;
Const.k = 1.38066E-23;
Const.E0 = 1000;
Const.T0 = 25;

param.aIsc = 0.0008;  % A/C
param.bVoc = -0.1900; % V/C

param.Rs_ref = 0.2;
param.Rsh_ref = 1000;
param.IL_ref = 8.0;
param.I0_ref = 5e-10;

param.a_ref = 1.05 * 60 * Const.k/Const.q * (273.15 + Const.T0);

EgRef = 1.121;
dEgdT = -0.0002677;

% Calculate full sun IV curve
Ee = 1000;
Tc = 25;
nPts = 100;
[IL, I0, Rs, Rshf, nNsVth] = pvl_calcparams_desoto(Ee, Tc, param.aIsc, param, EgRef, dEgdT);
fullsunIVcurve = pvl_singlediode(IL, I0, Rs, Rshf, nNsVth, nPts);

% Calculate shaded IV curve
Ee = 200;
[IL, I0, Rs, Rshs, nNsVth] = pvl_calcparams_desoto(Ee, Tc, param.aIsc, param, EgRef, dEgdT);
shadedIVcurve = pvl_singlediode(IL, I0, Rs, Rshs, nNsVth, nPts);

% Estimate Rs
Rs = pvl_est_Rs_Bowden(shadedIVcurve.Voc, shadedIVcurve.Isc, fullsunIVcurve.V, fullsunIVcurve.I)
Rs =

    0.2051

References:

See also

pvl_est_Rs_Swanson , pvl_est_Rs_sunsVoc , pvl_est_Rs_Pysch , pvl_est_Rs_IEC60891_1 , pvl_est_Rs_IEC60891_2

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