Abstract
This study investigates the efficient operation and advanced control of a wind energy conversion system (WECS) incorporating a grid-connected permanent magnet synchronous generator (PMSG). The proposed methodology employs a generator-side vector control strategy integrated with a modified flux-weakening current controller, enabling precise rotor speed tracking and accurate angle estimation through a reference -axis current control loop. This design ensures optimal energy capture, smooth system operation, and enhanced transient performance under variable wind conditions. Although the conventional Dual Second Order Generalized Integrator Phase-Locked Loop (DSOGI-PLL) performs satisfactorily under ideal grid conditions, its synchronization, accuracy and responsiveness degrade during disturbances such as harmonics and frequency fluctuations. To overcome these limitations, a Modified Quasi-Type-1 DSOGI-PLL is introduced, incorporating adaptive gain tuning and improved harmonic suppression to provide robust phase tracking and fast dynamic adaptation. This enhanced PLL is embedded within the overall PMSG control framework, with an emphasis on DC-link voltage stabilization and maintaining power quality at the point of common coupling (PCC). Extensive MATLAB/Simulink-based simulations under disturbed grid scenarios validate the proposed approach, demonstrating improved synchronization dynamics, reduced total harmonic distortion (THD), and superior voltage regulation, and greater operational robustness, thereby supporting reliable and grid-compliant renewable energy integration.
Keywords: Dual Second Order Generalized Integrator (DSOGI), Grid Synchronization, Phase-Locked Loop (PLL), Power Quality, Wind Energy Conversion System (WECS).