DC system is one of the important equipment of substation. In order to evaluate its operation status more accurately

this paper proposes a DC system risk evaluation system

which uses the improved subjective weighting G1 method to calculate the weight of indexes at all levels. The traditional DC system state evaluation is only limited to the substation end

ignoring the impact of the dispatching historical data. In this paper

combining the field with the regulatory data

the DC system risk evaluation system of the substation is proposed from multiple perspectives. The example shows that the evaluation result can reflect the DC system operation risk accurately and effectively.