Power transmission section overload risk and section reinforcement necessity quantitative evaluation method

The invention discloses a power transmission section overload risk and section reinforcement necessity quantitative evaluation method, which relates to the field of power grid operation analysis and comprises three steps of sample space generation, power transmission section overload risk quantitative evaluation and whole-grid power transmission section reinforcement necessity sequencing considering uncertainty variable influence. According to the method, uncertainty modeling is carried out on variables such as new energy output and load by utilizing a sampling blind number method of a nonlinear system, important information points are not lost while order reduction processing is carried out on mass data, and the probability of occurrence of an extreme mode is obtained, so that the section overload risk in the mode is quantitatively evaluated more scientifically and accurately, and the method has a good application prospect. The labor cost is saved, and the arrangement rationality of the section reinforcement