Single Inductor-Multi Input Single Output Buck-Boost Converter for PV system

Solar power generation systems experience variations in power output due to external factors. To overcome this challenge, SI-MISO (Single Inductor-Multi Input Single Output) DC-DC converters have been proposed. However, for application in solar power generation systems, Buck-Boost converters are essential. Nonetheless, research on the operation of SI-MISO NIBB (Non-Inverted Buck-Boost) converters with multiple PV modules connected has not been conducted. In this paper, a method for individual Maximum Power Point (MPP) tracking of multiple PV modules in a solar power generation system using SI-MISO NIBB converters is proposed. The paper analyzes changes in the power output of PV modules according to the operation of the Buck cell and Boost cell and confirms through experiments that three PV modules with different power outputs can individually MPP tracking method.