With　the　continuous　development　of　wind　power　and　load　demands,　new　challenges　arc　brought　to　power　grid　planning　by　the　issues　including　transmission　congestion,　wind　curtailment,　and　operation　safety　and　so　on.　Due　to　the　fast　response,　flexible　configuration　and　wide　application,　energy　storage　systems　play　an　important　role　in　wind　power　accommodation,　transmission　congestion,　and　system　safe　operation.　In　order　to　improve　the　transmission　capacity　and　anti-　disturbance　capability　of　a　power　grid,　the　power　transmission　capacity,　wind　curtailment　level　and　transient　stability　are　comprehensively　considered　at　the　planning　and　operation　level　by　involving　the　transient　operation　characteristics　after　faults.　A　two-layer　network-storage　joint　planning　model　is　established　in　multi-objective　form　with　the　system　construction-operation　indicator　and　system　stability　indicator.　The　outer-layer　model　is　a　multi-objective　model　considering　the　locating　and　sizing　of　the　energy　storage　systems.　The　inner-layer　model　is　a　transmission　network　expansion　planning　model　considering　the　unit　commitment　problem.　In　order　to　improve　the　solution　efficiency,　the　power　flow　constraint　of　the　expanded　line,　the　charge　and　discharge　model　of　the　energy　storage　system　and　the　generation　cost　curve　are　linearized.　By　solving　the　proposed　model　using　NSGA-II　algorithm　combined　with　GUROBI　and　developing　the　case　study　in　the　improved　Garvcr　6-bus　system,　the　validity　and　rationality　of　this　model　are　verified　in　different　scenarios.　©　2020,　State　Power　Economic　Research　Institute.　All　rights　reserved.