Modeling and Dynamic Analysis of a 9 MW DFIG-Based Grid-Connected Wind Energy Conversion System

Abstract

The global shift toward low-carbon energy sources has elevated the role of wind power in sustainable electricity generation. This study presents the design and MATLAB/Simulink-based simulation of a 9 MW grid-connected doubly fed induction generator (DFIG) wind energy conversion system. The system comprises a horizontal-axis wind turbine, back-to-back converters, and a DC-link, with decoupled vector control used to regulate active and reactive power. The wind farm is connected to a 120 kV point of common coupling and interfaced with a 575 kV transmission network through step-up transformer stages. System performance is evaluated under normal operating conditions and symmetrical grid faults, with emphasis on transient and steady-state response as well as fault ride-through capability. Sensitivity and correlation analyses identify grid frequency and converter switching frequency as the most influential parameters affecting system performance. The results demonstrate stable operation, effective power quality control, and satisfactory dynamic response, confirming the suitability of DFIG-based wind energy systems for large-scale grid integration. The findings provide practical guidance for optimizing wind power systems and support the deployment of reliable and resilient renewable energy infrastructure in developing regions.