A Hierarchical Optimal Dispatching Method Considering the Flexibility Margin of Regional Power Grid

In order to solve the problem of insufficient flexibility margin caused by the rising proportion of renewable energy, this paper proposes a hierarchical optimal dispatching method considering the flexibility margin of regional power grid. In this method, the flexibility resources of source-load bilateral are considered, and hierarchical optimization is carried out according to the dispatching priority to improve the sufficient flexibility margin of the regional power grid. Firstly, the priority of various flexible resources is determined by analyzing the available, which provides the basis for the hierarchical optimization and coordination of various flexible resources; Secondly, based on the instantaneous and short-term flexibility margin, a hierarchical optimal dispatching model with flexibility constraints is constructed to ensure the sufficient flexibility and reserve of regional power grid; Finally, the model is applied to the different working conditions of regional power grid for flexible resource hierarchical dispatching to verify its adaptability to different working conditions. The results show that the proposed hierarchical optimal dispatch method considering the flexibility margin of regional power grid can improve the ability of regional power grid to deal with the uncertainty of renewable energy.