Network damping capability of DFIG-based wind farm

In this paper, the network damping capability of DFIG-based wind farm is investigated. A simple network damping strategy with two auxiliary power system stabilizer (PSS) loops is proposed. The dynamics of the flexible rotor shaft-blades are also taken into account for this study since the possible interaction may occur between the network oscillation mode and the torsional oscillation mode. Both small signal stability and large transient stability are explored based on a generic power system consisting of both synchronous generator and DFIG. Networking damping performance of DFIG equipped with different active damping schemes is examined and compared. The results of both eigenvalues analysis and time-domain simulation are presented. The study shows that DFIG-based wind farms have the capability to enhance the network damping with the proposed damping strategy while this capability is constrained by some conditions. Controller should be properly designed based on these constrains.