Flexibility evaluation index system and calculation method of active distribution network with high proportion of renewable energy

With the promotion of energy reform, the development scale of renewable energy is ahead of schedule, and the proportion of renewable energy in the active distribution network is gradually rising. However, due to the uncertainty of its output, it brings many difficulties to the operation of the distribution network, such as the reduction of flexibility. Therefore, it is necessary to quantify the impact of uncertainty on flexibility. This paper focuses on the flexibility evaluation of the active distribution network. Different from the traditional distribution network, its flexibility mainly comes from the renewable energy on the source side, the multi load on the load side and the grid reconstruction on the grid side. Therefore, from the three aspects of the source network load, the evaluation index and calculation formula of the flexibility of the active distribution network are proposed, and then the flexibility evaluation system is established. Finally, through the simulation analysis of ieee33 node distribution network system, the results show that the proposed flexibility evaluation system can realize the quantitative evaluation of distribution network in different scenarios.