In microgrid

the presence of multiple renewable energy sources as power supplies

coupled with the influence of complex operating conditions

makes it challenging to ensure the output power quality. By analyzing various disturbance sources in power converters within the microgrid

active disturbance rejection repetitive control is proposed for a dual Buck converter. This method aims to suppress external disturbances and internal uncertainties in the system

thereby reducing harmonic content and improving the quality of the output power. A repetitive control component is utilized to suppress harmonics generated by high-frequency switches

improve the rejection ability of periodic disturbances

and overcome zero crossing distortion in the dual Buck converter; an extended state equation is established for dual Buck converters

which estimates and compensates for both internal state uncertainty and external non-repetitive disturbances in real-time. Then

the periodic delay which is the inherent drawbacks of the repetitive control is overcome

and the transient response and disturbance rejection capability of the system are improved effectively. The effectiveness of the proposed method is verified by MATLAB platform. The experiment results show that the proposed scheme obtains satisfied performance in alternating current (AC) voltage accuracy

dynamic performance

and disturbance resistance

especially in complex application scenarios such as load transients and nonlinear loads

the controller can reduce the output voltage fluctuations effectively

suppress waveform distortion

and ensure high-quality output voltage of the converter.