With　the　increasing　consumption　of　traditional　energy　and　rising　of　environment　pollution,　as　well　as　the　gradually　improving　requirements　of　users　for　power　supply,　the　application　of　distributed　generation　based　on　renewable　energy　and　clean　energy　technology　has　been　widely　used　in　power　system.　As　an　effective　form　for　distributed　generation　access　to　distribution　network,　microgrid　combines　the　distributed　power,　energy　storage　equipments　and　loads　through　power　control　and　energy　management　to　make　up　a　flexible,　controllable　autonomous　system,　which　can　operate　in　both　grid-connected　and　islanded　states　and　transfer　neatly　between　these　two　states.　Since　autonomous　operation　of　microgrid　cannot　do　without　effective　control　strategy,　how　to　control　the　operation　state　of　micro　grid　in　grid-connected　and　islanded　states　and　realize　smooth　switching　of　the　microgrid　is　an　important　content　of　study　on　control　strategy　of　microgrid.　In　the　light　of　the　problems　exist　in　microgrid　peer　to　peer　control　based　on　local　information　and　modified　droop　controller,　a　master　slave-peer　to　peer　integration　control　strategy　based　on　communication　is　proposed,　which　combines　advantages　of　master　slave　control　and　peer　to　peer　control,　achieves　steady　operation　of　the　micro　grid　in　grid-connected　and　islanded　states　as　well　as　smooth　switching　between　these　two　states　through　coordination　control　on　the　composite　energy　storage　system　and　micro　sources.