Auto synchronization of photovoltaic fed grid systems

Abstract

In this paper, an attempt to implement auto synchronization technique using Charge Pump Phase Locked Loop (CPPLL) for grid connected solar photovoltaic system (SPV) has been made. The main aim of this paper is to reduce the phase angle mismatch between the grid voltage and inverter voltage, which in turn would improve the quality of power delivered by eliminating the unwanted islanding condition. The detailed analysis of the system with CPPLL has been carried out using MatLab-Simulink and the compliance of the proposed system with IEEE 929 and ANSI C84.1 standards prescribed for power transfer from inverter to grid has been verified. The system is validated for disturbances affect synchronization and results are presented.