The　grid　connection　of　large-scale　wind　power　will　reduce　the　equivalent　inertia　and　damping　of　the　system,　resulting　in　a　decrease　in　system　frequency　stability.　The　directly-driven　permanent　magnet　synchronous　generators　(D-PMSG)-based　wind　turbine　(WT)　usually　uses　conventional　PD　control　to　support　frequency,　however,　the　related　controller　parameters　are　difficult　to　design,　reducing　economic　benefits　of　WT　power　generation　and　slowing　speed　recovery.　To　this　end,　based　on　the　analysis　of　the　dynamic　response　of　D-PMSG　grid-tied　system,　this　paper　studies　the　dynamic　influence　and　variation　law　of　controller　parameters　on　system　frequency.　A　WT　control　strategy　based　on　frequency　trajectory　planning　(FTP)　is　proposed.　The　frequency　fixed　value　determined　by　the　power　grid　regulation　is　directly　taken　as　the　control　target　to　carry　out　the　FTP,　and　the　WT　auxiliary　power　output　is　controlled　according　to　the　planned　frequency　trajectory.　The　system　frequency　is　supported　quickly　in　the　transient　process,　ensuring　the　safe　and　stable　operation　of　the　grid　while　realizing　the　economy　of　WT　power　generation.　The　effectiveness　and　economy　of　the　proposed　control　strategy　is　verified　by　RT-LAB　experiment.　©　2020　IEEE.