Design of Power Decoupling Strategy for Single-Phase Grid-Connected Inverter Under Non-Ideal Power Grid


Single-phase inverters require large electrolytic capacitors to decouple the dc bus from the ac side due to the power coupling between the dc bus and ac side. A power decoupling circuit can restrict the dc bus ripple voltage with double the fundamental frequency, however earlier research has concentrated on the power coupling of an ideal power grid and decoupled ripple power with twice the fundamental frequency, resulting in a significant reduction in capacitance. This research examines the power coupling in a non-ideal power grid and develops a novel approach for decoupling the dc bus power with multiharmonic frequency. It is possible to reduce the complexity of the system control structure by changing the reference values of dc series split-capacitors. Even more importantly, an additional notch filter has been added to help reduce the impact of power coupling on inverter output quality. Even in a poor power grid, the proposed approach can meet the goal of multifrequency-coupled power decoupling. Lastly, numerical simulations and practical findings show that the suggested method outperforms the conventional capacitor decoupling framework and the dual-voltage control decoupling scheme.

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