The intraday generation scheduling based on the security constrained economical dispatch is used in the provincial power grid. It is difficult to adapt to large-scale power loss problems caused by ultra HVDC blocking. In view of the above problems

a schedule model is put forward based on the tie line section and sub provincial reserve control. The model can be used to solve the contact line plan of the unit and the interconnected power grid in the large area network according to the actual operation situation of the power grid. The model proposed is applied to the East China power grid and the process of planning adjustment of unipolar and bipolar DC blocking has been analyzed. Simulation results show that the model can be considered on the premise of security constrained by other parameter settings

flexible control of mutually supportive interconnected provinces in the area

the unit and the tie line schedule adjustment of interconnected power grid cooperation ability

thus realizing the active large-range reasonable rebalancing.