Premium
Researches on Cascaded Photovoltaic Modular Systems for Performance Improvement with Power Margin Evaluation
Author(s) -
Xu Qingshan,
Sun Xiangdong,
Yukita Kazuto,
Goto Yasuyuki,
Ichiyanagi Katsuhiro
Publication year - 2010
Publication title -
ieej transactions on electrical and electronic engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.254
H-Index - 30
eISSN - 1931-4981
pISSN - 1931-4973
DOI - 10.1002/tee.20590
Subject(s) - photovoltaic system , maximum power point tracking , modular design , flexibility (engineering) , limit (mathematics) , power (physics) , reliability engineering , computer science , electronic engineering , margin (machine learning) , engineering , voltage , control engineering , electrical engineering , mathematics , mathematical analysis , statistics , physics , quantum mechanics , inverter , machine learning , operating system
Photovoltaic/converter modular systems offer flexibility with maximum power point tracking (MPPT) of the individual modules to decrease module mismatching losses, especially for building integrated photovoltaic (PV) systems. For achieving relatively high voltage outputs, a cascaded configuration is usually preferred at the same time. However, due to efficiency reasons, i.e. the general limit of conversion ratio, issues emerge in which not all modules can actually operate at optimal levels. This paper discusses the main issues encountered, and proposes a novel approach to evaluate power margins of PV modules at different operating levels, which can be an auxiliary criterion for judging whether some modules with lower irradiation should be bypassed or not in such cascaded configurations. Representative cases are investigated, and simulation results testify the validity of evaluating the potential and available power. The proposed approach can also be applied for practical MPPT of photovoltaic generation systems. Copyright © 2010 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.