Simulation of synchronous reference frame PLL for grid synchronization using Simulink

The important problem in integration of grid and power converter is how to synchronize the inverter with the grid that is one is before connecting an inverter to the grid and other is during operation. The energy transfer between an inverter and grid is improved by proper design of synchronization techniques. The challenges associated with the design is how fast the voltage, phase angle and frequency are estimated and synchronized under ideal and non-ideal conditions. For effective estimation of above quantity, various synchronization methods have been proposed. In this paper, theory of single phase PLL is outlined and design and simulation of Synchronous Reference Frame Phase Locked Loop and the obtained simulation results for various non-ideal conditions like harmonics, voltage dip, phase jump and frequency variations are presented.