The　reasonable　planning　of　wind　farm　installation　capacity　is　an　effective　way　to　lessen　the　wind　curtailment,　optimize　the　operation　of　power　system　and　reduce　the　loss　of　wind-power　suppliers,　which　depends　mainly　on　the　wind-power　accommodation　capability　of　grid,　the　wind　resource　of　wind　farm　and　the　operating　mode　of　wind-power　supplier.　A　multi-objective　hierarchical　optimization　model　is　proposed　for　the　reasonable　planning　of　wind　farm　installation　capacity.　The　first　optimization　layer　takes　the　environmental-economic　dispatch　of　grid　as　its　objective　to　fully　play　the　role　of　wind　power　in　the　energy-saving　and　emission-reduction.　It　analyses　and　calculates　the　wind-power　accommodation　capability　of　grid　for　different　typical　daily　loads　to　obtain　different　curves　of　wind-power　accommodation　level.　Based　on　the　optimal　grid　wind-power　accommodation　level　obtained　in　the　first　layer　and　the　stochastically-simulated　wind-speed　sequence　of　wind　farm,　the　second　optimization　layer　takes　the　minimum　summation　of　wind-curtailment　expectation　and　wind-shortage　expectation　as　its　objective.　It　establishes　the　random　chance　constrained　programming　model　to　evaluate　the　optimal　wind　farm　installation　capacity　with　the　consideration　of　expected　wind-power＇s　supplier　benefit.　Simulation　example　verifies　the　effectiveness　and　rationality　of　the　proposed　optimization　model.　©　2017,　Electric　Power　Automation　Equipment　Press.　All　right　reserved.