A　grid-side　reactive　power　control　strategy　is　proposed　in　this　paper,　which　aims　to　enhance　the　voltage　stability　of　highly　offshore　wind　power　penetrated　systems.　The　basic　idea　of　the　strategy　is　to　establish　an　evaluating　system　including　the　voltage　stability　index　(VSI),　VSI　sensitivity　index,　and　reactive　power　residual　adjustment　capability　index　(RPRACI).　The　indexes　can　be　applied　to　identify　the　voltage　dangerous　nodes,　locate　the　compensation　nodes,　and　determine　each　node＇s　amount　of　compensation.　The　strategy　is　particularly　suitable　for　large-scale　offshore　wind　power　integrated　systems　because　it　is　designed　to　deal　with　large　disturbances　such　as　offshore　wind　power　fluctuations.　This　strategy　can　be　specified　in　three　steps.　First,　voltage　dangerous　nodes　are　identified　by　the　nodal　VSI.　Next,　adjustable　nodes　are　chosen　according　to　the　sensitivities　of　each　node　to　the　dangerous　nodes　and　RPRACI　of　each　node.　Finally,　reactive　power　compensation　of　each　adjustable　node　is　allocated　depending　on　the　magnitudes　of　the　sensitivity　indexes.　The　simulation　results　in　the　IEEE　14-bus　system　indicate　that　the　proposed　strategy　can　effectively　improve　the　local　grid　voltage　stability　when　largescale　offshore　wind　power　is　injected　into　the　system.　Published　by　AIP　Publishing.