Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 34, Issue 12, Pages 11791-11812Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2019.2910247
Keywords
Adaptive notch filters (ANFs); frequency-locked loop (FLL); phase detection; phase-locked loop (PLL); second-order generalized integrator (SOGI); synchronization
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Synchronization techniques can he classified into open-loop and closed-loop methods. In power and energy applications, which are the focus here, the latter type is more popular. Phase-locked loops (PLLs) and frequency-locked loops (FLLs) are two broad categories of closed-loop synchronization techniques. The aim of this paper is providing a review of recent advances in designing single-phase FLLs, which can be very useful for both researchers and engineers. The historical development of a standard single-phase FLL, its modeling and tuning aspects, its relationship with adaptive notch filters, its advanced versions for the synchronization purposes under adverse grid conditions, its modification for different industrial applications, its connection with single-phase Pills, and its discretization aspects are the main parts of this review.
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