Solar Microconverter Implements Novel MPPT Algorithm

To date, virtually all photovoltaic (PV) systems employ series-connected PV cells to some degree. A typical 4kW residential solar array, for example, might comprise a dozen series-connected 200-W modules, or roughly 864 cells connected in series. The virtues of this arrangement are (1) that the system’s conductive losses are well managed because the array output current is no higher than that of an individual PV cell and (2) that high voltage is developed without efficiency loss. The disadvantage is that optimum energy harvesting can be achieved only if all PV cells can operate at their maximum power point (MPP) simultaneously.