With　the　continuous　expansion　of　the　power　system　and　the　construction　of　the　series　compensator　devices　in　Northwest　China,　interactions　between　the　generators　and　the　power　grid　become　more　complicated　while　the　problem　of　subsynchronous　resonance　(SSR)　is　more　prominent.　To　deal　with　this　problem,　a　controller　named　subsynchronous　resonance　dynamic　suppressor　(SSRDS)　based　on　voltage　source　converter　(VSC)　for　damping　SSR　of　multi-generator　system　is　proposed.　Meanwhile,　this　study　also　presents　an　analysis　of　the　control　strategy　of　SSRDS　and　the　method　of　connecting　the　power　grid.　The　damping　characteristics　of　SSRDS　and　the　interaction　between　SSRDS　and　grid　are　analyzed　by　the　complex　torque　coefficient　method.　A　detailed　electro-magnetic　transient　simulation　model　based　on　the　expansion　topology　of　future　Jinjie　Power　Plant　in　northern　China　is　established　to　verify　the　analytical　results.　The　results　show　that　the　proposed　control　strategy　can　effectively　suppress　SSR　in　the　system　of　six　generators　and　six　modes　through　one-to-many　control　method.　Compared　to　the　traditional　thyristor　controlled　reactor-subsynchronous　damping　controller　(TCR-SSDC),　the　controller　can　achieve　the　same　effect　with　a　smaller　capacity,　a　faster　response　and　less　harmonic　pollution.　©　2019　Institution　of　Engineering　and　Technology.　All　rights　reserved.