Abstract:China Southern Power Grid Co., Ltd. has set up a demonstration project of flexible interconnected system for a University urban distribution network, which is used to simulate and study the operation of microgrid and a large number of distributed generators connected to the actual distribution network.This paper first introduces the basic structure of the demonstration project and the basic principle of the simulation platform. Secondly, in order to satisfy the IEC61850 standardization of power grid model and related equipment in the simulation platform and realize the successful interaction with other IEC61850 devices, this paper designs a solution which covers the "four remote" information modeling, UDP protocol conversion and MMS server software implementation of real-time simulator, and provides the corresponding simulation platform. Port communication verification method, IEDScout model verification method and "four remote" function verification method. Finally, the information modeling of the real-time simulator, the protocol conversion from UDP to IEC61850 are completed, The "four remote" functions in the data transmission and distribution network system of the real time simulator and the IEC61850 client are realized, which provides guidance for the following project implementation, and also provides reference for the research on domestic new distribution network operation mode and IEC61850 research.