Due　to　the　special　structure　of　doubly-fed　induction　generator　(DFIG)　whose　stator　connects　to　the　grid　directly,　Subsynchronous　resonance　(SSR)　is　more　likely　to　appear　in　DFIG-based　wind　farm　connected　with　series　compensated　networks.　This　paper　proposes　a　combined　SSR　damping　strategy　based　on　virtual　resistance　method　and　SSR　damping　controller　(SSRDC).　The　virtual　resistance　method　is　used　in　rotor　side　converter　controller　(RSC),　and　the　SSRDC　is　inserted　in　grid　side　converter　controller　(GSC).　The　results　of　eigenvalue　analysis　show　that　the　damping　ratio　of　SSR　mode　increases　significantly　in　this　way.　And　the　time-domain　simulation　results　also　show　that　the　combined　SSR　damping　strategy　have　a　better　performance　at　SSR　suppression　than　only　using　virtual　resistance　method　or　SSRDC.　This　strategy　has　great　robustness　of　SSR　damping　controls　and　is　easy　to　implement,　making　it　have　a　broad　application　prospect.　©　2019　IEEE.