Abstract:
The project is to design a solar charger with Maximum power point tracking (MPPT). MPPT is a phenomena in which photovoltaic (PV) array is made to operate at a voltage level where power extracted from it is maximum. The system will charge the battery by the solar panel through a charger circuit in such an efficient way that solar panel will transfer maximum energy to the battery. MPPT is a real-time control scheme applied to the PV power converter in order to extract the maximum power possible from the PV panel. The MPPT working principle is based on the maximum power transfer theorem. The power delivered from the source to the load is maximized when the input resistance seen by the source matches the source resistance. Therefore, in order to transfer maximum power from the panel to the load the internal resistance of the panel has to match the resistance seen by the PV panel. For a fixed load, the equivalent resistance seen by the panel can be adjusted by changing the power converter duty cycle.
Maximum power point of solar panel changes with radiation level and temperature. To track this maximum power point different algorithms are proposed and few of them are implemented and compared in the project named as
• Hill climbing
• Perturb and observe
• Three point weight comparison
• Incremental conductance
• Fuzzy logic controller based algorithm
