The imbalance of grid voltage will lead to the fluctuation of the output power of PV grid-connected inverter. In view of the elimination of this adverse effect, a proposal has thus been made of the power fluctuation suppression strategy based on positive sequence voltage extraction. By using the adaptive notch filter, an extraction can be achieved of the positive sequence components of sampled voltage, thus eliminating the components that result in the power fluctuation, with an effective control of the output power of PV grid connected inverter realized. Finally, the feasibility and effectiveness of the method can be verified by a model simulation and experimental research.