Battery　energy　storage　system　(BESS)　is　a　pivotal　component　to　increase　the　penetration　of　renewable　generation　and　to　strengthen　the　stability　and　reliability　of　the　power　system.　In　this　paper,　for　the　purpose　of　the　state　of　charge　(SOC)　balancing　and　reactive　power　sharing,　a　multiagent　system　(MAS)-based　distributed　control　model,　which　contains　a　top　layer　communication　network　built　by　agents　and　a　bottom-layer　microgrid　composed　of　BESSs,　distributed　generators　(DGs),　and　Loads,　is　provided.　Next,　a　systematic　method　is　designed　to　build　the　control　laws　for　agents　from　any　given　network,　where　each　agent　on　the　top　communication　network　collects　the　states　of　BESSs,　DGs　it　connects　and　exchanges　information　with　its　neighboring　agents.　Moreover,　two　theorems,　which　provide　guidelines　to　design　distributed　control　laws　for　SOC　balancing　and　reactive　power　sharing　between　BESSs,　are　proposed　to　show　the　convergent　property　of　the　proposed　control　laws.　Furthermore,　several　simulation　cases　are　employed　to　validate　the　effectiveness　of　the　proposed　control　model　when　environmental　conditions　and　time-varying　load　demands　are　considered.　Finally,　the　simulation　results　verify　the　effectiveness　of　the　proposed　control　model,　i.e.,　the　SOC　balancing　and　proportional　reactive　power　sharing　are　achieved　as　expected.　Furthermore,　our　approach　has　the　fast　convergent　speed　of　SOC　balancing　of　BESSs,　compared　to　the　existed　method.　©　2013　IEEE.