Batteries and DC charge control of stand-alone photovoltaic system. Experimental validation

This work presents an experimental control strategy of stand-alone photovoltaic (PV) system composed of: PV array, DC-DC converters, electrolytic storage and programmable DC electronic load. This control aims to extract maximum power from PV array and manages the power transfer through the DC load, with respect to available storage level. The designed system can supply a DC load at the same time as energy production. The experimental results obtained with a dSPACE 1103 controller board show that the system responds within certain limits that appear as soon as one of the storage voltage thresholds is reached: either loss of energy produced, or insufficient energy toward the load.