Parameter identification of grid-forming energy storage under wide operating conditions

In order to solve the deterioration of the accuracy of parameter identification under wide operating conditions, a grid-forming (GFM) energy storage closed-loop identification model and a linear quadratic iterative solution method are proposed. Starting from the physical nature of the grid-related characteristics of the GFM energy storage converter and its control system, aiming at the deterioration of the accuracy and consistency of parameter identification in different scenarios and operating conditi ons, a closed-loop identification model based on the mathematical abstraction of the power grid is constructed, and it is extended to adapt to different power grid conditions to improve the accuracy and consistency of the identification of GFM energy storage parameters under wide operating conditions, and finally the proposed method is verified by simulation tests. The results show that the closed-loop identification system based on the abstract power grid model can flexibly simulate the change of operating conditions, and the identification results of the linear quadratic iterative solution have good consistency for the changes of operating conditions.