Optimized photovoltaic stand-alone battery charging system with MPPT for varying illumination condition

In this paper the output voltage regulation in response to the perturbation of input voltage by means of varying insolation condition with reference to the perturb and observe maximum power point tracking algorithm was presented and a battery charging for stand-alone photovoltaic (PV) applications was presented for varying illumination condition. The essential work of modeling, control and regulation of output voltage for battery application due to varying input voltage by means of varying insolation condition was carried out. The buck converter was used as a power conditioner for battery charging application. The advantageous of the proposed method are: better exploitation of the available PV charger by means of a perturb and observe maximum power point tracking (MPPT) techniques employed in the control algorithm, increased battery lifetime due to higher level state of charge operation and the charging control process does not depends on accurate battery current measurements. Through this modeling and design the satisfactory performance of the converter in both transient and steady state conditions were obtained and presented.