In a current power system, numbers of distribution networks are physically connected to a transmission network at different boundary buses. As the planning solution of one network significantly influences the decisions made by planners of other networks, the transmission and distribution networks should coordinate and cooperate with each other to design the entire power system in a secure and economic manner. Inspired by hierarchical and distributed optimization theories, this paper proposes a coordinated decisionmaking framework to determine the planning scheme and scenario based generation schedule for hybrid transmission and distribution networks (HTDNs). A stochastic bi-level hierarchy is presented to decompose the centralized optimal planning of HTDNs. The obtained subproblems for independent transmission and distribution networks are formulated and solved using an iterative solution process. The simulation results demonstrate the effectiveness of the proposed coordinated planning framework.
Keywords hybrid transmission and distribution network(HTDN), hierarchical and distributed model, coordinated optimization, stochastic planning