Accurate Maximum Power Point Tracking Algorithm Based on a Photovoltaic Device Model

Table 1

SR-20 PV device specifications (A.M.1.5, 1 kW/m², 25°C).

Voltage at MPP	Vmax = 17.2 V
Current at MPP	Imax = 1.17 A
Short-circuit current	Iscr = 1.28 A
Open circuit voltage	Voc = 21.6 V
Maximum power	Pmax = 20 W
Ideality factor	A = 1.9
Charge of 1 electron	q = 1.6e^−19 C
Boltzmann constant	k = 1.380658e^−23 J/K
Band gap energy	Eg = 1.12 eV
Reverse saturation current at Tr	Ior = 5.98e^−6 A
Short-circuit current generated at Tr	Iscr = 1.28 A
Temperature coefficient of short-circuit current	ki = 512.10^−6 A/K
Number of cells connected in series	ns = 36
Number of cells connected in parallel	np = 1
Internal series resistance of a cell	Rs = 0.004 Ω
Internal parallel resistance of a cell	Rp = 1000 Ω