Implementation of ripple correlation control MPPT for single-phase VSI grid-connected PV systems

In this paper, the implementation of the ripple correlation control technique maximum power point tracking (RCC-MPPT) and the current control based-on the rotating reference frame application for a single-phase voltage source inverter (VSI) grid-connected photovoltaic system (GCPVS) is proposed. The algorithm has been developed using the mean function to generate the sign of direction to track the maximum power transferring from a set PV strings to the utility grid, through the single-phase VSI. The proposed method is a simple algorithm, which operates with high accuracy and reliability for the correction of the maximum power point on rapidly changing of the control method and PV power irradiance. Additionally, this method can generate the sinusoidal current with the unity power factor. Simulation and experimental results of the a single-phase VSI grid-connected PV system are presented to confirm the effectiveness of the scheme and algorithm.