Autonomous load sharing technique in solar photovoltaic system-based DC microgrid

In this article, efforts have been made to study, analyse and implement the autonomous current sharing technique by using two parallel-connected Solar Photovoltaic (SPV) systems with a maximum power point tracking controller (MPPT) considering cable resistances. It mainly formulates a procedure to minimise the current sharing mismatch across the load by controlling the duty cycle of MPPT controller. Also, an analysis of various factors affecting (SPV) characteristics has been reported. Further, the system has been analysed with two interconnected SPV systems to a common load, and an accurate load sharing phenomenon has been achieved by using adaptive gain tuning technique. The proposed scheme has been verified by conducting the experiments, and its results have been explored for various irradiation and load conditions. Experimental results reveal that at all conditions current from the sources are equally shared to loads and adequate rest is delivered to energy storage systems.