Distributed control is an important way to realize wide area protection and control applications in smart distribution network

real-time performance of the message is a key factor that affects the performance of distributed control. The communication requirements of distributed control applications in distribution network are analyzed and the transmission methods available for real-time message are compared. A scheme for transmission of real-time message which uses generic object oriented substation event(GOOSE)based on user datagram protocol(UDP)multicast is proposed

and real-time message transmission through the WAN is realized in this scheme. The performance test of this transmission scheme on the trial platform shows that the maximum transmission latency of message between distribution terminal units is less than 10 ms

which could satisfy the requirements of distributed control applications in distribution networks.