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Subsynchronous resonance (SSR) phenomenon in wind farms connected with series compensated transmission network has been researched in recent literature. Mitigating SSR using FACTS devices such as TCSC, SVC, and STATCOM has also been explored in the literature. The ability of the power converters in doubly-fed induction generator (DFIG) wind farms in mitigating SSR has rarely been investigated. In this paper, the DFIG converters will be explored for SSR mitigation. The investigation in this paper includes the design of auxiliary SSR damping controller and selection of control signals. Residue-based analysis, root locus diagrams, and time-domain simulation in Matlab/Simulink will be carried out. The major contributions of the paper are 1) investigation of the potential of wind farm converters for SSR mitigation and 2) identification of an effective control signal for SSR damping controller to simultaneously enhance both subsynchronous and supersynchronous resonance modes.