Converting the transient data of BPA to DIgSILENT is an effective method for lack of dynamic data in DIgSIELNT. This paper compares the electromechanical dynamic models of the two commercial simulation software to realize model matching of synchronous generators and loads. Building the frame and models of synchronous generator controllers based on the double layer structure of Frame and Block in DIgSILENT

realizing the matching of synchronous generator controllers. Data matching is achieved by a Python language based program that converts transient data

which is supported by DIgSILENT. Furthermore

the large-scale data is automatically converted from BPA to DIgSILENT based on model matching and data matching. The effectiveness of data conversion is verified by simulation results of an IEEE 3-machine 9-bus benchmark system

and the 411-machine 6 613-bus East China power grid.This work is supported by National High Technology Research and Development Program of China(863 Program)(No. 2015AA050202)and State Grid Corporation of China.