FOCV Based MPPT Control for PV, and Sine Reference-Feedback Oriented Control for Single Phase Grid Tied Solar Inverter

Solar grid tied inverters are playing important role in power transfer towards grid from a PV power conversion system. Mostly grid tied inverters are implemented in 3 phase or single phase mode in home or offices and load inside the corresponding user is shared with both inverter and utility. Most of the inverters use parke's transformation control for controlling 3 phase power and clarke's transformation for controlling single phase power. Since the utility frequency and computation time of controller is quite important, the time required to calculate the injecting frequency. The transformation cause more computation time and within that time, instantaneous value of reference sine wave changes. The proposed control method decreases the computation requirement by eliminating the transformation matrix and implementing a combination of sine reference- feedback control. Thus not only computation time, but also we could eliminate the control delay on varying load conditions. The power injection at point of common coupling is achieved by current control loop followed by the implemented control part. Also a MPPT control method called as Fractiona Open Circuit Voltage is done to fix DC voltage on MPPT level.