A Novel Hybrid Adaptive Filtering Algorithm Controlled STATCOM for LVRT Capability Enhancement of DFIG

This work focuses on enhancing transient stability or low voltage ride-through (LVRT) in a doubly fed induction generator (DFIG) by dynamically tuning all the PI controllers of the STATCOM using a novel approach. The hybrid enhanced block sphere Bayesian’ algorithm (EBSBA) and ‘least mean square root of exponential’ (LMSRE) algorithms (EBSBA- LMSRE) is proposed as a solution, offering key advantages such as high convergence speed, low computational complexity, and a straightforward design. The main goal of this work is to address voltage fluctuations and restore stable conditions in the DFIG. In this work, the cascaded structure-based proportional integral (PI) controllers are implemented on the voltage source converter (VSC) of the static synchronous compensator (STATCOM). During the transient, the gain of the PI controllers is automatically adjusted by the proposed hybrid EBSBA-LMSRE algorithm. The EBSBA-LMSRE-PI controlled STATCOM demonstrates superior response and damping compared to the LMSRE-PI and EBESBA-PI controllers, especially under normal and abnormal grid disturbances.