A novel bi‐level optimization model for load supply capability issue in active distribution network

摘要

This paper develops a novel bi-level optimization model for load supply capability (LSC) based on the economic dispatch of distributed generation in active distribution network. The upper subproblem describes the LSC. The lower subproblem denotes the economic dispatch, which is set up as one of the constraint conditions in LSC problem. Thus, the maximum LSC can be obtained on the premise that each operation point achieves the optimal scheduling. Moreover, load static voltage characteristics are considered in this model, which can avoid the inaccuracy of power flow distribution caused by constant power model. To describe the random property of nondispatchable distributed generation, chance constrained programming is adopted in the bi-level optimization model. Hierarchical iteration algorithm is applied to solve the bi-level optimization model. The upper and lower subproblems are calculated by particle swarm optimization based on stochastic simulation. A modified IEEE-33 bus distribution network is tested to demonstrate the effectiveness and superiority of the proposed model. The analysis results demonstrate that the model conforms to the practical operation of active distribution network.