Distribution Network Based on operational safety assessment method with the failure to restore the value of lost load grid

The present invention relates to a method for operating a security assessment with fault recovery loss of load power values ​​based on the system operator belonging to automation and simulation technologies power grid. The method of distribution network for scanning N-1 fault, loss of power to the load is calculated to optimize recovery loss of power that can be recovered load value at each fault; After scanning, the cumulative load power loss recovery obtained per total recovery loss of power load value. According to the total loss of power load value, the total value of the loss of load could resume, the total value of the load recovery, the establishment of operational safety index distribution network. Among these, the loss of load failure recovery optimization is considered active and reactive power, voltage, and operating constraints of the radial distribution network optimization model detail recovery, the mixed integer quadratic constraint programming problem using the branch and bound method to solve; The present invention is based indicator assessment with the safe operation of the power grid optimization model, developed, can reflect the current distribution network operating conditions and the safety of the network structure.