With the fast development of ultra-high voltage power grid

the high-level requirements are put forward for simulating the dynamic characteristic of DC transmission projects. This paper proposes a technical scheme of constructing digital-analog hybrid simulation platform with multiple DC control and protection devices for large-scale AC/DC power grids. From the aspects of simplifying the principle of DC control and protection devices

interface techniques for digital-analog hybrid simulation

and requirements of DC system modeling

this paper puts forward a modeling method of digital-analog hybrid simulation for the DC transmission project accessing to the large-scale simulation power grid. The typical fault during the site commissioning test of Yibin-Jinhua UHVDC project is used to make a detailed comparison between the digital-analog hybrid simulation test results and the field test waveforms. The comparison results show that the dynamic response characteristics of the proposed digital-analog hybrid simulation model are highly consistent with the operation characteristics of the actual project. The digital-analog hybrid simulation model is able to reproduce the actual system and accurately simulate the phenomenon of AC/DC interaction

which could provide the strong technical support for the safe and stable operation of AC/DC power grids. The proposed simulation model can also be used as a calibration tool for other digital simulation models.