Of the optimal operation problems of the ultra-high voltage(UHV)transmission corridors

how to select the appropriate transmission capacity and the bundle proportion of wind power and thermal power is especially important for economic and stable operation of power grids. In this paper

a planning method is developed. First

a comprehensive index system

including static security index

transient stability index

voltage stability index

economic operation index

and the power demand index

is established that takes into account the stability

security and economy of the receiving end system. Then based on these indices

the objectives of the mathematical model are defined with multi-objective functions. The non-dominant sorting genetic algorithm-Ⅱ is adopted to solve the multi-objective model. And the non-inferior solutions of the model are treated as transmission alternatives. Moreover

a decision method is adopted to rank the alternatives. Finally

the influences of the change in number of alternatives and different index values on the sorting results are analyzed via probabilistic sensitivity analysis. In addition

changes in the ranking results of schemes using different weighting and decision-making methods as well as the robustness of optimum scheme are analyzed and compared. A regional power network case study is presented to verify the necessity and rationality of the planning method proposed.