Open AccessResearch on LCL filter considering grid impedance
Author(s) -
Liguo Wu,
C. Z. Zhang
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/354/1/012098
Subject(s) - grid , correctness , electrical impedance , harmonic , inverter , filter (signal processing) , control theory (sociology) , photovoltaic system , computer science , stability (learning theory) , distributed generation , electronic engineering , engineering , electrical engineering , physics , acoustics , mathematics , voltage , renewable energy , geometry , control (management) , artificial intelligence , machine learning , programming language
Due to the large amount of access to distributed energy, the grid usually exhibits weak grid characteristics, which puts higher demands on the inverter. The use of LCL filters in photovoltaic grid-connected systems is beneficial to suppress high-frequency switching harmonic currents from entering the grid. However, the LCL filter increases the system order and the system stability is also affected by the grid impedance. In this paper, the non-isolated PV grid-connected inverter based on LCL filtering is studied, and the effects of grid impedance on system stability, LCL filter harmonic suppression and LCL filter parameter optimization design are studied. The influence of grid impedance on system stability is analyzed in detail. The simulation results verify the correctness of the research.