Research on Fast Power Flow Calculation Method for Multiple Faults Based on Double Line Outage Distribution Factors

With the continuous expansion of the power grid scale, the power grid is more prone to multiple faults, resulting in more serious power outages. Based on the distribution factor of N-1 single branch, the line outage distribution factor of N-2 double branch power flow transfer is derived. Based on the DC power flow model, the active power flow transfer after two branches are broken at the same time is quickly calculated. The simulation results of IEEE 39 bus system show that the fast power flow calculation method of double line outage distribution factor N-2 contingency in this paper has good accuracy and practicability, and can be applied to the screening of N-2 expected faults and the rapid safety verification of power generation plan or market clearing results.