Hierarchical and Distributed Optimal Dispatch for Coupled Transmission and Distribution Systems Considering Wind Power Uncertainty

This paper propose a hierarchical and distributed coordinated optimal dispatch strategy for coupled transmission and active distribution networks considering wind power uncertainty, which divide the system operation into transmission dispatching level, distribution dispatching level and local dispatching level. The transmission level sub-problem is formulated as energy and reserve dispatch model based on improved interval approach to account for wind power uncertainty. Located in distribution system, the local level jointly optimize the renewable distribution generation (R-DG) and energy storage system (ESS), for balancing the output fluctuation of R-DG. The results are reported to upper level directly, so the distribution level sub-problem is formulated as dynamic economic dispatch model. Based on it, an analytical target cascading (ATC) based iterative solution method is applied to find an optimal strategy, where transmission and distribution system independently dispatch their resources as well as satisfying operation constraints of whole system. Finally, the effectiveness of the proposed dispatch strategy is validated through test case