Multivariable Current Controller for Enhancing Dynamic Response and Grid Synchronization Stability of IBRs

ABSTRACT This paper develops a multivariable current control strategy for inverter‐based resources (IBRs) based on optimal control theory to enhance their dynamic performance and grid synchronization stability. The structure of the implemented multiple‐input, multiple‐output (MIMO) controller closely resembles that of the commonly used conventional single‐input, single‐output (SISO) PI controllers for IBRs. As a result, it requires only minor adjustments to conventional vector current control schemes, thereby facilitating its straightforward adoption. Time‐domain simulations and analytical analysis demonstrate the superior performance of the developed method under various conditions and use case scenarios, such as weak power systems and uncertain parameters.