The Congestion Management in Active Distribution Network Based on the Master-Slave Game

With continually increase of permeability of demand-side flexible resources in distribution network, its uncoordinated operating mode may lead to line congestion and nodal voltage out-of-limit in distribution network. To cope with these problems, a master-slave game bi-level dispatching framework, in which the nodal marginal price of distribution network was uniformly cleared, was proposed. The problem of minimizing user’s electricity utilization cost under the guidance of the load aggregator, which was the leader of the master-slave game, was solved by the upper framework. The problem of maximizing social welfare by the distribution network system operator, which was the follower of the master-slave game, under the premise of considering power flow security and voltage out-of-limit was solved by the lower framework. By use of the Karush-Kuhn-Tucker optimality condition and the duality theorem, the nonlinear bi-layer problem was translated into monolayer mixed integer linear programming problem to solve. The correctness of the proposed model is verified by simulation result, and its effectiveness of mitigating distribution network congestion as well as the effect of flexible resources in the management of distribution network congestion are analyzed.