Programmable Multi-input Buck-Boost Converter for Photovoltaics Arrays

This paper proposes a programmable multi-input buck-boost structure method, which can enhance the operation tolerance for the PV array under extremely harsh climatic conditions. The proposed structure based on a traditional two switches buck-boost converter can connect PV panels in parallel and cascade flexibly, and also enable the individual operation of each PV panel. The active switches can be programmed to change the connection structures as well as achieve the maximum power point track of PV panels simultaneously. The paper presents the programming method for an exemplified scalable structure converter for two PV panels. The simulation has been established in MATLAB/Simulink to validate the performance of the proposed converter in terms of multiplexing function, wide operating range of PV panels, and low switching stress.