Impact of Grid‐Side Converter Filter on the Small‐Signal Stability of a Grid‐Connected DFIG‐Based Wind‐Driven System

ABSTRACT The incorporation of doubly fed induction generators (DFIGs) into wind‐driven systems (WDS) has become increasingly significant because of their efficient and adaptable power generation capabilities. The proposed system consists of a wind turbine (WT), wind generator, rotor‐side converter (RSC), grid‐side converter (GSC), grid‐side filter (GSF), and a line network. The GSF can have a significant impact on the performance and small signal stability (SSS) of grid‐connected DFIG‐based wind‐driven systems (WDS). This work offers a comprehensive SSS analysis of the proposed system, incorporating GSF dynamics into the modeling process. This study connects the DFIG‐based WDS with a single‐machine infinite bus (SMIB) test system and uses an in‐depth simulation approach to evaluate the effect of the voltage and current dynamics of the grid‐side LCL (inductor‐capacitor‐inductor) filter on SSS under different operating conditions. The analysis employs eigenvalue and participation factor techniques to examine how GSF dynamics influence the SSS of the system. Further, the dynamic behavior of rotor speed, electrical torque, DC‐link voltage, and voltage at the point of common coupling (PCC) is investigated in response to various step disturbances in wind speed and infinite bus voltage. The proposed model enhances the system's dynamic performance and improves the current and power quality of the DFIG by reducing total harmonic distortion (THD). All the simulation studies were conducted in a MATLAB/SIMULINK environment. Finally, the simulation results were validated for real‐time applications through real‐time control simulations on the OPAL‐RT platform. This study offers valuable insights into the dynamics of GSFs in DFIG‐based WDS, providing practical recommendations for improving system performance and grid integration.