A low-cost microcontroller-based maximum power point tracking system with multiple-string connection for PV stand-alone applications

摘要

The aim of this paper is to design and implementation of a multiple-string connection using modular buck converter with Maximum Power Point Tracking (MPPT) for stand-alone PV solar energy system. A simple, highly-performance algorithm suitable to be implemented in a low-cost microcontroller (PIC 18F4431) has been developed in order to make photovoltaic arrays track and operate in their maximum power point. A 3kWp prototype distributed solar controller comprising 4-modular MPPT buck converters with the proposed control scheme has been designed and implemented. Experimental results confirm excellent tracking effectiveness and rapid dynamic response.