Focusing on the construction sequence issues of power grid projects under the AC/DC hybrid interconnection pattern between the Western Inner Mongolia Power Grid and the North China Power Grid

this paper firstly determines the target grid structure of the UHV AC/DC hybrid interconnection system for the Inner Mongolia Power Grid and establishes a corresponding data model. Based on this model

multiple construction sequence schemes for UHV AC/DC systems are proposed. The safety and stability of the existing grid

target grid

and transitional grid are validated through time-domain simulation. For issues such as short-circuit current exceeding limits at certain substations and generator tripping following severe faults in the DC transmission channels during the transitional period

corresponding control measures are proposed. And a comparative analysis is conducted on various construction schemes from three aspects: power flow distribution

short- circuit current

and stability. Finally

based on the analytic hierarchy process(AHP)

a comprehensive evaluation system is constructed around five indicators: transmission capacity

power flow transfer

short-circuit current

transient stability

and dynamic stability. Through weight assignment

index quantification

and score calculation

the optimal ranking of the schemes is achieved

and the most favorable UHV AC/DC construction scheme for the Inner Mongolia Power Grid is determined.