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New maximum power point tracker for photovoltaic systems exposed to realistic operational conditions

Di Vincenzo, Maria Carla and Infield, David (2014) New maximum power point tracker for photovoltaic systems exposed to realistic operational conditions. IET Renewable Power Generation. ISSN 1752-1416

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Abstract

In the outdoor environment and under real operational conditions, photovoltaic (PV) systems are affected by several parameters which cannot be considered constant, principally PV cell temperature and incident radiation, and neither of these will in practice be uniform across a PV array or even an individual module. This last aspect results in non-standard IV characteristics that can exhibit more than one local maximum. The challenge of the maximum power point tracker is finding the true maximum power point (MPP) in the face of all the variation and complexity the real environment imposes on the PV behaviour. It must do this quickly and effectively so the algorithm which controls the DC/DC converter that controls the PV system terminal voltage and thus its operating power point has to be fast and precise. This study proposes a new algorithm that is demonstrated to be highly effective in tracking the MPP under real operating conditions.