Fuzzy sets theory and primal-dual path following interior point algorithm are used for total transfer capacity(TTC) problem with the most disadvantageous loading direction and soft constraints.

• 将模糊集理论和原始-对偶内点法应用于求解在最不利的负荷增长方式下并具有可伸缩不等式约束的最大输电能力问题。