Abstract
Electrical characteristic mismatches of series-connected photovoltaic (PV) substrings is well known for triggering various negative influences, such as a significant reduction in power generation and occurrence of multiple maximum power points (MPPs). Recently, curved PV panels have been developed. Uneven solar irradiance due to the curved surface results in mismatched substring characteristics. Although various kinds of differential power processing (DPP) converters have been proposed to address the mismatch issues, the conventional converters equipping with bulky magnetic components, such as inductors and transformers, are difficult to be employed for curved PV panels. This paper proposes an LLC resonant voltage multiplier (VM)-based bendable DPP converter using a flexible transformer. The proposed DPP converter can flexibly be applied to curved surfaces thanks to the flexible transformer and lack of bulky magnetic components. Experiments under mismatched irradiance conditions were performed, and the results demonstrated the proposed DPP converter could preclude the mismatch issues.
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