Fault probability and time domain simulation quasi-steady-state-based successive fault online evaluation method

The invention discloses a successive fault online evaluation method based on fault probability and time domain simulation quasi-steady state. The equipment fault probability, the fault position and the fault type are given based on external meteorological disaster evaluation; generating a successive fault sequence according to the equipment fault probability or manual assignment; for each successive fault sequence, according to an equipment fault sequence, a control protection model of the direct current system, a second three-defense line control strategy, new energy off-network protection and an alternating current and direct current equipment protection model are considered; quasi-steady-state operation mode judgment and safety and stability and accident event level risk assessment after equipment faults are carried out based on time domain simulation, quasi-steady-state power flow stability calculation data are generated to be used for online safety and stability and accident eventlevel risk assessment of