A Bidirectional DC-DC Converter and Fast-GMPPT Algorithm for Photovoltaic Cells

Aiming at the laser wireless power transfer (LWPT) system powered by photovoltaic (PV) cells for batteries at receiver, this paper proposes a new type of cascaded bidirectional DC-DC converter, which is convenient for energy transfer between PV cells and energy storage batteries. This DC-DC converter improves efficiency by providing an auxiliary current path which can reduce output current ripple. In addition, aiming at the energy distribution law of Gaussian laser irradiation, this paper summarizes the unique law of the output characteristics of PV arrays under Gaussian laser irradiation, and proposes a global maximum power point tracking (GMPPT) algorithm for PV arrays under Gaussian laser irradiation, which can be used for the proposed cascaded bidirectional DC-DC converter, and is faster than the existing traditional GMPPT algorithm that is generally applicable to uneven sunlight, which further improves the energy utilization. The experimental platform of the proposed converter and GMPPT algorithm is built to verify their effectiveness, and the results show that the proposed converter has better performance, and the GMPPT algorithm used can quickly and effectively track the global maximum power point compared with the traditional GMPPT algorithm.