Fractional-order repetitive control (FORC) based on fractional delay filter has been used to deal with the timevarying periodic references due to its simpleness and easiness to implement. However, the FORC schemes have been designed to compensate selective harmonics to gain fast transient response, which will result in poor suppression effect on other-order harmonics. Thus, in this study, an improved frequency adaptive FORC is put forward to track or reject the time-varying periodic signals. A proportional channel is used in parallel with repetitive control to improve the transient response. Furthermore, the steady-state and dynamic performances of the proposed scheme are analysed. A experimental inverter platform based on MATLAB/Simulink and QuaRC is used to validate the effectiveness of the proposed control strategy. The experimental results obtained verify that the improved adaptive repetitive control can minimise the period harmonic distortion and has good dynamic response.
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