A repetitive control strategy for three-phase active power filters in variable-frequency power grid
GAO Feng
Abstract：To improving the current tracking performance and compensation effect of three-phase shunt active pow-er filter(APF)in variable-frequency environment,a frequency-adaptive repetitive control strategy based on shunt generic internal model was proposed.The proposed shunt generic internal model can adjust compensation range and delay time ac-cording to changes in harmonics of current reference and its delay time is 1/2 shorter than other internal models which have same compensation range.These features significantly enhance the dynamic performance and the adaptability of repetitive controller. Fractional-order delay links which caused by changes of grid frequency approximated by linear interpolation method.It makes the repetitive controller based on shunt generic internal model can adapt to frequency changes.The com-pound repetitive control system was designed in plug-in mode and the stability condition and convergence of compound system were analyzed in detail. The comparison of proposed control strategy with others was made in shunt active power filter of aircraft variable-frequency power grid.Simulation and experimental results were shown to confirm the validity and superiority of the proposed repetitive control strategy.
Keywords：active power filterscurrent trackingrepetitive controlinternal modelvariable-frequency power grid
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 447-456 )