Designing and implementation of MPPT controller for varying radiance in solar PV system

Photo voltaic power generation has an important role to play due to the fact that it is a green source. After their installation they generate electricity from the solar irradiation without emitting greenhouse gases. Electrical energy presently comprises about fifteen percent of energy demand in the world, but this percentage is considerably higher for developed societies and tends to increase. Electricity consumption is strongly correlated with economic growth; economic growth allows further use of electric appliances which in turn increases electricity demand. The output power produced by photovoltaic systems is directly related to the amount of solar energy acquired by the system, and so it is extremely important to track the sun´s position according to its trajectory with accuracy. In this paper the deigning and implementation of a solar tracker is explained which is using a stepper motor and light sensor and automatically follows sun´s trajectory. This tracker can be used for increasing power collection efficiency by tracking the sun. An MPPT solar tracking system has been designed, implemented and presented in this paper.