A new dual-input photovoltaic (PV) power optimizer with integrated energy storage and high voltage gain is proposed in this paper. The features of the proposed optimizer are summarized as follows: 1) four different duty ratios are used to achieve the maximum power point tracking of the PV sources, the battery power control, and the output voltage regulation, respectively; 2) low input current ripple, which is appropriate for PV application; 3) high voltage gain is achieved by magnetic coupling method, and the lower the magnetic turn ratio, the higher the voltage gain; 4) the PV power input sources can provide power to the load and the battery individually or simultaneously; 5) there is no dc current saturation in the core due to the capacitor in the primary winding. The steady-state analysis of the proposed optimizer is studied in detail. Further, the feasibility of the proposed optimizer is verified by the simulation results.
"A Dual-Input High Step-up Photovoltaic Power Optimizer with Integrated Energy Storage" Ruijun Liu, Qingxin Tian, Guohua Zhou