Comparative Analysis of Enhanced Phase-Locked Loop (PLL) Approaches for Renewable Energy Resources Integration

This paper presents a comprehensive comparative analysis of two enhanced Phase-Locked Loop (PLL) designs for the integration of renewable energy resources into distribution grids. The proposed PLL architectures incorporate a hybrid structure to enhance dynamic performance under challenging grid conditions, including voltage unbalance, frequency deviations, and harmonic distortions. Through detailed simulations, the synchronization accuracy, response time, and transient stability of the two PLL approaches are evaluated under a variety of grid disturbances. The results demonstrate the distinct advantages and effectiveness of each design, highlighting their respective strengths in different transient scenarios. This study provides critical insights into the selection and optimization of PLL-based synchronization techniques for improved grid integration of renewable energy systems.