An Improved Dynamic Power Decoupling Method for Grid-Forming Inverters

In grid-forming inverters, strong power coupling can lead to steady-state errors, slow dynamic response and large overshoot in output power, even system instability. In existing methods, the grid information is needed to achieve power decoupling, and decoupling expressions with fixed parameters fail to achieve dynamic power decoupling in full range of operating conditions. To address these issues, this paper proposes an improved dynamic power decoupling method based on voltage and phase angle cross-feedforward. In this method, the output power is utilized for deriving the decoupling compensation and variable parameter decoupling expressions to achieve dynamic power decoupling in all operating conditions, where the extraction of dynamic components is optimized, and the need for grid voltage and frequency measurement is avoided. Finally, simulation and experimental results verified the effectiveness of the proposed method.