Main Article Content
Abstract
The performance of a photovoltaic (PV) array is affected by temperature, solar isolation, shading and array configuration. Often, the PV arrays get shadowed, completely or partially, by the passing clouds, neighboring buildings and towers, trees, and utility and telephone poles. Under partially shaded conditions, the PV characteristics get more complex with multiple peaks. Yet, it is very important to understand and predict them in order to extract the maximum possible power. In the usual series connected wiring scheme, the residual energy generated by partially shaded cells either cannot be collected(if diode bypassed) or, worse, impedes collection of power from the remaining fully illuminated cells (if not bypassed). Rapid fluctuation of the shading pattern makes maximum power point (MPP) tracking difficult; generally, there will exist multiple local MPPs, and their values will change as rapidly as does the illumination. In this paper, a portable solar PV system that effectively eliminates both of the aforementioned problems is described and proven. And also Parallel-configured PV systems are compared to traditional series configured PV systems with hardware experiments.