Isolated PV battery management system to power home appliances

This paper presents an intelligent and cost effective approach for a photo-voltaic and battery based DC system. Typically a rooftop Photovoltaic (PV)-battery system employs an inverter to drive various home appliances. This conversion from low voltage DC to AC invariably causes an increase in both losses and cost. This paper proposes a novel back to back dc-dc converter topology for a PV-Battery standalone system that can cater to various daily home appliances eliminating the need for an inverter system. The proposed topology renders an additional degree of freedom where the load side converter regulates the load power by regulating the load voltage within limits without much effecting the load performance. Further, source side and load side power management schemes are developed which regulates the load voltage (within limits) and PV array output keeping batterys state of charge into consideration. The proposed system is simulated in MATLAB/Simulink environment. The results obtained under different loading conditions validate the proposed method.