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Open AccessArticle

A Fast GMPPT Algorithm Based on PV Characteristic for Partial Shading Conditions

Department of Electrical and Electronics Engineering, Gümüşhane University, Gümüşhane 29100, Turkey
Electronics 2019, 8(10), 1142; https://doi.org/10.3390/electronics8101142
Received: 10 August 2019 / Revised: 28 August 2019 / Accepted: 2 September 2019 / Published: 9 October 2019
(This article belongs to the Special Issue Photovoltaic Systems for Sustainable Energy)
Photovoltaic (PV) modules experience some partial shading conditions (PSC) due to some various factors. In that kind of a condition, a few maximum power points (MPPs) possibly appear on the power-voltage (P-V) curve, which increases the tracking difficulties. It is known that maximum power point tracking (MPPT) may not be realized by hill climbing (HC) based conventional MPPT algorithms under PSCs. In this context, this paper presents a novel micro converter based algorithm that was developed by using P-V characteristics of PV modules. Unlike voltage or duty ratio scanning techniques, this paper introduces a new deciding method to determine the correct global MPP (GMPP) region. For this, the proposed method uses some duty ratios that were calculated corresponding to each MPP region. Thus, the initialization of duty ratio is done properly, which results in high tracking speed and accurate tracking of the GMPP. The other advantages of the proposed algorithm are structural simplicity, less computational burden, and ease of implementation with a basic microcontroller. The simulation results show that this algorithm has fast tracking capability and it manages to track GMPP for PSCs correctly, since it includes an artificial scanning procedure. Single ended primary inductance converter (SEPIC) is built in order to validate the proposed global maximum power point tracking (GMPPT) algorithm. The performance of the proposed GMPPT technique is verified by experimental studies. The results show that the proposed GMPPT technique is fast by up to five times than an adaptive full scanning strategy and improved IC algorithm. Furthermore, the proposed algorithm can be commercially used in micro converters, since it is compatible with small number of bypass diodes in a module. View Full-Text
Keywords: duty ratio sampling; global maximum power point tracking; micro converter; MPPT; partial shading condition; photovoltaic module; power optimizer duty ratio sampling; global maximum power point tracking; micro converter; MPPT; partial shading condition; photovoltaic module; power optimizer
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Başoğlu, M.E. A Fast GMPPT Algorithm Based on PV Characteristic for Partial Shading Conditions. Electronics 2019, 8, 1142.

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