The service integration of transmission and distribution network is a trend in regional power grid dispatch operation and development. In consideration of the present energy management system(EMS)and distribution management system(DMS)development in an independent mode

the service demand of transmission and distribution network in coordinated operation and analytic calculation is analyzed. The coordinated operation overall structure of transmission and distribution network advanced application are proposed. On this basis

several key technologies

including unified modeling

topology analysis

power flow calculation

risk assessment and fault handling in transmission and distribution network are treated

while references for coordinated operation and system construction in transmission and distribution network dispatch service are provided.