Systematic Controller Design for DFIG-Based Wind Turbines to Enhance Synchronous Stability During Weak Grid Fault

Wind turbines are susceptible to synchronous instability during weak grid fault, due to the complex control loop coupling relationship. It is essential to design system control loops that can adapt to severe operating conditions. In this paper, in order to improve the synchronous stability of the doubly fed induction generator (DFIG) based wind turbines, the D-partition method is introduced to determine the stable region of the system. Then, multiple indexes such as dynamic performance and steady-state performance of the system are used as constraints to further divide the system parameter region. The results demonstrate that compared to traditional methods, the proposed method can accurately locate the stable parameter region of the system without repeated attempts, and can be presented in a specific graphical form. The simulation analysis verifies the accuracy of the theory.