Modeling and Simulation of PV Parallel Arrays under Multiple Illuminations

Building-integrated photovoltaics (BIPV) provide great flexibility for energy conservation and emission reduction. However, uneven illumination distribution can result in multi-peak characteristics, negatively impacting the system's efficiency. Therefore, it is crucial to establish a photovoltaic (PV) cell model that is adaptable to environmental changes. The existing wildly-used seven-parameter circuit model faces big challenges in real engineering applications due to its unmatched parameters to the ones provided by manufactures. To address this issue, this study utilizes the maximum power point matching method and investigates parameter optimizations, including photocurrent (Ipv), reverse saturation current (Io), as well as ideality factor (A). An optimized seven-parameter model is established and the output characteristics of two different kinds of PV panels are presented. To maximize the output power, it is necessary to optimize the array configuration. Based on the enhanced even-parameter model, this paper does in-depth investigations on the maximum output of the six typical structures under three typical shading patterns, which are Series-Parallel (SP), Bridge-Linked (BL), Total-Cross- Tied (TCT), Honey-Comp (HC), Long Strings (LS), and Multi Strings (MS). The research findings will contribute to the selection of the optimal structure for PV arrays under various shading scenarios.