Maximum power point tracking-implementation strategies [for PV power systems]

The cost of PV modules dictate that maximum use be made of the available power that can be produced. To achieve this goal, it is necessary to match the PV module characteristics with that of the load. Although this fact is not new, many charge regulation products and water pumping systems still operate on less than optimum principles. Especially, small systems (50-80 W) make use of direct coupling to the PV module or rely on fixed voltage operation. The purpose of this work is to investigate the reasons for the status quo and to seek acceptable solutions, both technically and economically. The need for extracting maximum power from a PV module is obvious. A cost-effective method, which is reliable, will make optimum power point tracking feasible, even for low power applications.