With the fast development of ultra-high voltage power grids

and more and more serious interaction effects between AC/DC and DC/DC

the power grid safety faces serious challenges

and the higher-level performance requirements are put forward for power system simulation tool. Till now

the digital-analog hybrid simulation of the control and protection devices in real high voltage direct current(HVDC)projects is the more accurate mean to be adopted for studying the dynamic characteristic of the large-scale AC/DC power grids. Based on the existed digital-analog hybrid simulation technology

a construction scheme for a new generation digital-analog hybrid simulation platform is proposed to study the operation characteristics of large-scale AC/DC power grids. In this scheme

the electromagnetic-transient real-time simulation software HYPERSIM and super parallel computer SGI are used for the digital simulation

and the control and protection devices of all the existed HVDC and other power electronic projects are able to be connected to the digital simulation power grid. Thus

the high-precision simulation problems of large-scale AC/DC power grids are solved

and the real-time simulation of large-scale AC/DC power grids with 8 sets of HVDC projects control and protection devices and more than 6 000 nodes is achieved. By actual faults reproductions and detailed comparisons between the digital-analog hybrid simulation test and the field test

the effectiveness of the proposed construction scheme of simulation platform are verified.