Advanced Three-Phase Plls for Grid Synchronization in the Application of Power Quality Compensators

Effective techniques for extracting the fundamental frequency positive sequence (FFPS) component are crucial for integrating renewable energy sources (RESs) and enhancing the disturbance rejection capability of synchronous reference frame frequency-locked loop (SRF-FLL) systems under diverse grid conditions. This paper offers a concise overview and assessment of phase-locked loop (PLL) techniques. It then provides a comparison and selection guide to assist in choosing the suitable PLL for specific applications, aiming to enhance the control and integration of RESs in power systems.