Security evaluation for distribution power system using improved MIQCP based restoration strategy

Outage load caused by N-1 contingencies can be restored automatically or manually in distribution network. Therefore, the restored load can be considered as an index to represent the distribution network security level. In this paper, a security evaluation method is proposed, in which a MIQCP (Mixed Integer Quadratic Constrained Programming) based restoration model is used. Meanwhile, methods are introduced to improve the computation efficiency of evaluation procedure. Numerical tests on a PG&E 69-node system are given to illustrate the rationality of the proposed security evaluation method. A larger 269-node system is used to show the computation efficiency.