Maximum power point tracking for PV generator feeding different DC motor drive systems

A simple method of maximum power point tracking for photovoltaic generator feeding magnetoelectric DC-current motor in stand-alone photovoltaic drive system, without a buffer energy source, has been described in this paper. The specific quality of this method is assuring the maximum power working point of the generator in indirect way - by maximisation of motor input power. This method makes maximum power point tracking independent of generator cells temperature and insolation, and of any changes of generator output characteristic (voltage-current) curves caused by light cells aging and shading of some cells shaded with snow or dirt. This method was implemented in a laboratory stand for two similar version (analogue and digital with microcontroller), some differing in a tracking method, and its results have been presented and compared herein.