TY - JOUR
T1 - High-Order Frequency-Locked Loops
T2 - A Critical Analysis
AU - Golestan, Saeed
AU - Guerrero, Josep M.
AU - Quintero, Juan Carlos Vasquez
PY - 2017/5
Y1 - 2017/5
N2 - In very recent years, some attempts for designing high-order frequency-locked loops (FLLs) have been made. Nevertheless, the advantages and disadvantages of these structures, particularly in comparison with a standard FLL and high-order phase-locked loops (PLLs), are rather unclear. This lack of knowledge is attributable to the difficulty of small-signal modeling of these high-order FLLs, which has limited their analysis to numerical studies. Focusing on three-phase FLLs, the idea of designing high-order FLLs is first generalized in this letter. Then, a second-order FLL is considered as the case study, and its small-signal modeling, stability analysis, and parameter tuning are presented. Finally, to gain insight about advantages and disadvantages of high-order FLLs, a theoretical and experimental performance comparison between the designed second-order FLL and a standard FLL (first-order FLL) as well as a unification between FLLs and PLLs is presented.
AB - In very recent years, some attempts for designing high-order frequency-locked loops (FLLs) have been made. Nevertheless, the advantages and disadvantages of these structures, particularly in comparison with a standard FLL and high-order phase-locked loops (PLLs), are rather unclear. This lack of knowledge is attributable to the difficulty of small-signal modeling of these high-order FLLs, which has limited their analysis to numerical studies. Focusing on three-phase FLLs, the idea of designing high-order FLLs is first generalized in this letter. Then, a second-order FLL is considered as the case study, and its small-signal modeling, stability analysis, and parameter tuning are presented. Finally, to gain insight about advantages and disadvantages of high-order FLLs, a theoretical and experimental performance comparison between the designed second-order FLL and a standard FLL (first-order FLL) as well as a unification between FLLs and PLLs is presented.
KW - Synchronization
KW - Complex filters
KW - Frequency-locked loop (FLL)
KW - Phase-locked loop (PLL)
U2 - 10.1109/TPEL.2016.2636746
DO - 10.1109/TPEL.2016.2636746
M3 - Journal article
SN - 0885-8993
VL - 32
SP - 3285
EP - 3291
JO - I E E E Transactions on Power Electronics
JF - I E E E Transactions on Power Electronics
IS - 5
ER -