Novel Open-Circuit Photovoltaic Bypass Diode Fault Detection Algorithm

Mahmoud Dhimish, Zhicong Chen

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In this article, a novel photovoltaic (PV) bypass diode fault detection algorithm is presented. The algorithm consists of three main steps. First, the threshold voltage of the current–voltage (I–V) curve is obtained using different failure bypass diode scenarios. Second, the theoretical prediction for the faulty regions of bypass diodes is calculated using the analysis of voltage drop in the I–V curve as well as the voltage at maximum power point. Finally, the actual I–V curve under any environmental condition is measured and compared with theoretical predictions. The proposed algorithm has been experimentally evaluated using a PV string that comprises three series-connected PV modules, and subtotal of nine bypass diodes. Various experiments have been conducted under diverse bypass diodes failure conditions. The achieved detection accuracy is always greater than 99.39% and 99.74% under slow and fast solar irradiance transition, respectively.
Original languageEnglish
Article number8852735
Pages (from-to)1819-1827
Number of pages9
JournalIEEE Journal of Photovoltaics
Volume9
Issue number6
Early online date30 Sep 2019
DOIs
Publication statusPublished - 1 Nov 2019

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