A Non-Singular Fast Terminal SMC to Enhance the Dynamic Stability of Wind Energy Conversion System-based Microgrids During Grid Faults

Fast and accurate mitigation of dynamic instabilities resulting from grid faults is critical for the safe and reliable operation of microgrids. This paper proposes a non-singular fast terminal sliding mode control (NFTSMC)-based approach to enhance the dynamic stability of wind energy conversion system-based microgrids. The approach combines the fast convergence and robustness of NFTSMC with the fast current controllability of static synchronous compensators (STATCOM) to provide reactive power support and stabilize the grid voltage in the presence of grid faults and mismatched disturbances. The stability of the NFTSMC approach is established using the Lyapunov stability theory. The control approach is implemented in a test microgrid system and assessed in the presence of mismatched disturbances and a symmetrical grid fault. Its dynamic performance is also compared to that of a standard sliding mode controller. The obtained results confirmed the ability of the proposed scheme to effectively mitigate dynamic instabilities resulting from grid faults and provide grid support under faulty conditions.