Phase Locked Loop (PLL) MPPT Based Single Stage Grid-Connected PV System

This paper focuses on phase-locked loop (PLL) based MPPT control configuration for single stage grid-connected PV system. The proposed PLL based MPPT technique is working on synchronization algorithm features. The PLL is introduced to offer unity pf operation that includes synchronization between the output current of inverter and grid voltage. Also, PLL based control structure is to provide pure sinusoidal current reference. The PLL is used for the monitoring of grid voltage to achieve amplitude and frequency equal to the grid level. In this research work, incremental conductance manner is implemented for the MPPT control algorithm. The performance of the proposed control configuration is examined in MATLAB/Simulink state for a grid-attached PV system. In this work, the proposed controller scheme is implemented for a grid connected PV system of 52 kW grid capacity and 2 kW PV system which is being supplied to 50 kW load. The waveforms are presented which describe the superiority of the proposed scheme.