A MPPT algorithm for partial shading conditions employing curve fitting

Batzelis, Stratis, Kampitsis, Georgios and Papathanassiou, Stavros A. (2016) A MPPT algorithm for partial shading conditions employing curve fitting. In Proceedings of the 32nd European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC 2016). EU PVSEC. 1502 - 1508 . (doi:10.4229/EUPVSEC20162016-5AO.9.2).

Record type: Conference or Workshop Item (Paper)

Abstract

Standard maximum power point tracking (MPPT) algorithms often fail to locate the global maximum of a photovoltaic (PV) system under partial shading conditions, while other more sophisticated approaches usually involve extra perturbation of the operating point, which entails undesired output power fluctuation. In this paper, a new MPPT method is introduced, which continuously detects the shading parameters and estimates all power peaks (MPPs) on the P-V curve, guaranteeing continuous operation at the global maximum. The algorithm applies least squares (LSQ) curve fitting (CF) to measurements at the current MPP, utilizing the inherent ripple, without the need for additional perturbation on the operating point. The calculations performed are entirely mathematical and no extra measurement equipment is required, such as irradiance or temperature sensors. The method is designed for PV strings illuminated at two irradiance levels.

Text

Batzelis - A MPPT algorithm for partial shading [accepted] - Accepted Manuscript

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