A novel design of charge controller for a standalone solar photovoltaic system

Abstract

The paper presents the design of a charge controller for a standalone photovoltaic (PV) system. It comprises of a battery to store the energy for eliminating intermittency in the electricity supply, a boost converter solely operated to achieve MPPT and a bidirectional buck-boost DC-DC converter for intriguing the philosophy of charge control. The charge control algorithm envisages controlling the charging and discharging action in all the three operating zones of the battery. The perspective owes to reduce the overall system cost through the use of a novel battery charging management technique and accomplish greater battery charge levels for increasing its life expectancy. The scheme evaluates the potential of the intended method using simulation analyses from a 250W solar panel allowed to charge a 12V, 100AH battery. The results reveal a balanced energy stream out of the PV module directed towards battery as well as the load in addition to ensuring the optimal use of the PV power.