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A novel multipoint direct-estimation method for the maximum power point tracking of photovoltaic modules under partially shaded irradiation conditions

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5 Author(s)
Jen-Cheng Wang ; Dept. of Bio-Ind. Mechatron. Eng., Nat. Taiwan Univ., Taipei, Taiwan ; Yu-Li Su ; Kun-Chang Kuo ; Jyh-Cherng Shieh
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The characteristics and performance of photovoltaic (PV) modules in PV-assisted generation systems are deeply affected by environmental conditions, such as temperature, non-uniform irradiation, and solar shading. Under partially shaded conditions, several local maximum power points (MPPs) are found in the power-voltage curve of PV modules. The PV characteristics change with multiple MPPs, so the actual MPP tracking becomes a difficult task. Conventional methods for tracking the MPP of PV modules under partially shaded conditions cannot be quickly find the actual MPP. Based on the p-n junction semiconductor theory, we develop a multipoint direct-prediction method for directly estimating multiple MPPs for power tracking of PV modules under partially shaded conditions. The proposed method is a new and simple approach with a low calculation burden. The experimental results demonstrate that the proposed method helps in the optimization of the MPP control model in PV modules.

Published in:

Energy Conference and Exhibition (ENERGYCON), 2012 IEEE International

Date of Conference:

9-12 Sept. 2012