Detection method of fundamental positive sequence components based on double second-order generalized integrator frequency-locked loop
WU Zhenjun
YANG Kai
QIN Fangyuan
Abstract：In view of the problem of three-phase voltage unbalance, the double second-order generalized integrator frequency-locked loop
(DSOGI-FLL) was designed.It used DSOGI-FLL angular frequency feedback instead of the second order generalized integrator phase-locked loop (DSOGI-PLL) frequency feedback, and realized the adaptive control of the input voltage frequency. Four conditions including asymmetric voltage drop, harmonic pollution, phase mutations, frequency mutations were simulated in Matlab/Simulink platform, and its performance was compared with DSOGI-PLL.The results showed that DSOGI-FLL had the better characteristics in tracking phase and frequency in all kinds of cases; especially so when the phase variation and frequency variation happened.
Keywords：double second-order generalized integrator (DSOGI)frequency- locked loop(FLL)three-phase voltage unbalancefundamental positive sequence component
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 91-96 )