Optimized Nonlinear Grid‐Forming Controller Based on Feedback Linearization

The grid‐forming (GFM) converters connected renewable energy (RE) to the power grid, which can offer inertia and damping support under disturbance, thereby enhancing the stability of power grid in weak‐grid conditions. However, in the controller, the active and reactive power are coupled with each other. Thus brings errors into the GFM controller, leading to the inaccuracy of the GFM controller. To address this issue, this paper designs a feedback controller for GFM converters based on exact linearization. First, considering the characteristics of the GFM converter, the simplified model of the GFM converter is built and the mathematical expression of the GFM controller is derived. Then, the diffeomorphism is built to linearize the nonlinear GFM controller. After that, the feedback controller is designed and the parameters are modified to improve the dynamics of the GFM controller. Finally, simulation results are provided to verify the effectiveness of the feedback controller.