Open AccessPV panels R s parasitic resistance degradation estimation by means of the MPPT controller modified operation: the M ‐factor calculation
Author(s) -
SánchezPacheco F.J.,
HerediaLarrubia J.R.,
Petrone G.,
SidrachdeCardona M.
Publication year - 2020
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2020.1617
Subject(s) - firmware , maximum power point tracking , photovoltaic system , control theory (sociology) , power factor , equivalent series resistance , controller (irrigation) , maximum power principle , power (physics) , point (geometry) , mathematics , computer science , engineering , electrical engineering , physics , control (management) , voltage , agronomy , geometry , quantum mechanics , inverter , artificial intelligence , computer hardware , biology
This Letter describes a method to quantify online and in real‐time, the level of degrading of the series parasitic resistance R s of a photovoltaic (PV) panel. This method aims to obtain the herein proposed M ‐factor, which results from the calculation of the slopes of the I–V curve in the boundaries of its maximum power‐point. For this purpose, the slight modification of the maximum power‐point tracker controller’ perturb and observe algorithm is required. This procedure can be easily integrated into its firmware with no additional costs. The M ‐factor calculation is performed instantaneously and since no disconnection is required, no significant power losses are produced.