Open AccessNotch correction strategy of LCL-type grid-connected inverters based on GCFAD
Author(s) -
Junqi Zhang,
Tao Feng,
Libo Tang
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1732/1/012175
Subject(s) - control theory (sociology) , grid , band stop filter , electrical impedance , robustness (evolution) , amplitude , phase margin , computer science , filter (signal processing) , engineering , bandwidth (computing) , low pass filter , mathematics , physics , control (management) , electrical engineering , telecommunications , artificial intelligence , amplifier , chemistry , operational amplifier , biochemistry , geometry , computer vision , gene , quantum mechanics
Considering the control delay, grid-current-feedback-active-damping(GCFAD) method can ensure the stability of the system through the reasonable design of parameters, but when the grid impedance changes, the system may be unstable because the LCL resonance peak cannot be effectively suppressed. In this paper, a notch correction strategy is proposed. The amplitude drop characteristic of the notch filter is used to effectively suppress the LCL resonance peak in this paper, so as to ensure that the system has sufficient amplitude margin when the grid impedance changes. The robustness of the system is greatly improved to the grid impedance when the GCFAD method is adopted. Finally, the simulation model verifies the effectiveness of the proposed strategy.