Dynamic stability and sub-synchronous resonance suppression in wind-integrated grids using rotor-side virtual inertia control

This paper investigates methods to enhance stability and dynamic performance in wind-integrated power systems, particularly under sub-synchronous resonance (SSR) and fault disturbances. A Virtual Inertia-based Supplementary Damping Controller (VISDC) is implemented on the rotor-side converter (RSC) of a doubly-fed induction generator (DFIG) to address inertia deficits and mitigate SSR issues in weak grids. Four control strategies are evaluated: absence of supplementary control, grid-side converter (GSC)-based damping, combined GSC–RSC control, and the newly proposed VISDC-based RSC control. Eigenvalue analysis indicates that the VISDC substantially improves small-signal stability by shifting key poles leftward in the s-plane. Simulations and real-time OPAL-RT experiments utilizing the OP4610XG platform demonstrate the controller’s efficacy across various series compensation configurations and fault scenarios, with results exhibiting close agreement between simulation and physical testing. The VISDC ensures minimal overshoot (approximately 6–7%), the fastest settling time (roughly 2.1–2.3 seconds), and significantly reduces torque, current, and power oscillations. Additionally, it provides dependable fault ride-through capability and rapid voltage recovery (approximately 3.5 seconds). In conclusion, the VISDC presents a robust, scalable, and low-complexity solution for improving the stability of wind power systems.