To cope with the computational difficulty of this problem,an ordinal optimization theory based algorithm for solving the optimal solution is proposed,which can best satisfy the engineering requirements.

For this reason,it is proposed in this paper that by means of combining ordinal optimization theory with GA and guiding the genetic evolution operation by ordinal optimization as well as integrating the excellent features of both ordinal optimization and GA by hybrid algorithm,the efficient search of global optimal solution with higher probability is implemented.

The ordinal optimization theory based on practical engineering provides an efficient tool to obtain good enough solutions to transmission expansion planning problem with a high probability,and helps to remarkably lighten the computation load and well satisfy the engineering requirements.