The integration of large-scale renewable energy generation systems into the power grid has led to such issues as voltage fluctuation and harmonics at the integration point of the power system. In this paper

a elegant anti-disturbance control strategy for grid-forming inverters is proposed for solving the problem of voltage fluctuations and current harmonics in power system. Firstly

a compensating function observer is designed to eliminate the effects due to aperiodic disturbances and internal parameter uncertainties and

at the time of improving the dynamic response of system

enhance the system immunity and robustness as well as reduce voltage fluctuation of the integration point. Then

a repetitive controller is designed to prevent shift of the notch frequency by placing a zero-phase filter outside the inner loop of the repetitive controller

thereby enhancing harmonic suppression capability. Finally

an IEEE three-machine nine-node system is set up in the RT1000 real-time simulator to verify the performance of the proposed elegant anti-disturbance control strategy.