Comparison of Different PLL Strategies for Applications in a Wind Generation System

Grid synchronization is a fundamental issue in the connection of renewable energies to the grid by using power converters. This paper presents an analysis and comparison of Phase Locked Loop (PLL) strategies for the synchronization to the grid of a wind energy conversion system (WECS) based on a permanent magnet synchronous generator (PMSG). It discusses the impact of PLL in the output current of three-phase inverter, through an analysis of the harmonic distortion contained in the current for each case. The simulation results obtained by MATLAB/SIMULINK shown that the PLL proposed in this work, presents a satisfactory performance in steady state and transient.