摘要:The high proportion of new energy connected to power grid has significantly increased the level of uncertainty in power system. The addition of noise elements in nonlinear operations in the existing affine power flow calculations will lead to overly pessimistic limits on the calculation results, thereby increasing the conservatism of the results. In response to the above problems, a flexible interval optimal dispatching method for active distribution network based on spatial approximation is proposed. Firstly, the spatial approximation method is introduced to modify the affine nonlinear operation, and an improved affine operation algorithm with less conservatism is obtained, which is introduced into power flow calculation of distribution network. Secondly, the models of operational flexibility requirements and each flexibility resource supply are constructed for active distribution network. And then, taking the system operating economy, net load fluctuation rate and operating flexibility margin as the goals, an interval multi-objective optimal dispatching model for active distribution network is established. Finally, in IEEE-33 node system the results of the proposed affine power flow calculation based on spatial approximation are compared with the traditional power flow calculation and Monte Carlo simulation method. The results show that the proposed method has less conservatism, and the interval results can provide good reference value for distribution system dispatchers.