As theSmost widely used standard of intelligentSsubstationSScommunication,IEC61850 satisfies the quite high requirement in real-time and reliable communications,but does not defineStheSspecific communicationSprotocol,which causes difficulties such as variation of mapping and non-standardization. Based on the existing problems of MMS and highScouplingSmodel of client/server communicationSissues,this paper proposes a new view, which is data distributions service applied in the distributed communication system to replace MMSSas applicationSlayerSprotocol.SDDSSadopts data-centerSpublish-subscribeScommunications model, and overcomes theSproblems about height coupling modelSbetween serverSandSclient; P/S modelSalso provides the support of QoS and improves the flexibility of communication. As well,DDS defines Global data space, provides aSsimple and intuitiveSwayStoStransferSdata,and furtherStoSmeet theSrequirementsSofSreal-timeSsystems.
