A Novel Active Power Filter Based on System Harmonic Impedance Control
HU Qingwei
CHEN Kunyi
SUN Lingjie
LIANG Dingshou
KE Xianwang
Abstract：In view of the problem that the filtering effect of traditional active power filter was affected by the detection accuracy of harmonic current,resulting in incomplete filtering,a hybrid active power filter based on the harmonic impedance regulation filter principle was proposed.The first part of the filter was a single-phase transformer secondary side-connected inverter in series in the power grid,and the second part was a passive filter in parallel between the single-phase transformer and the load.Through impedance regulation,the harmonic equivalent impedance of the series transformer was large,and the harmonic equivalent impedance of the passive filter was relatively small.According to the shunt principle,each harmonic current was forced to flow into the passive filter branch,so as to achieve the filtering of each harmonic.In order to adjust the harmonic impedance of the system,passive filter parameters and inverter control parameters were designed.Finally,a simulation model was built in Matlab/Simulink,and the simulation results showed that the total harmonic distortion rate of the system side current could be reduced from 29.37%to 0.69%,which met the national harmonic standard.The research has a certain application prospect in harmonic suppression.
Keywords：active power filterharmonic equivalent impedance controlharmonic suppressioninverter controlparameter tuning
Publication Date：2024-06-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 247-253,292 )