With the large number of microgrids connected to the ADN system, it has an important impact on the safe and stable operation of ADN system. This paper constructs an optimal operation model of the ADN system with multiple microgrids based on the bi-level programming theory, where the upper level model considers the operation loss and voltage offset of the distribution network and the lower level model considers the generation cost and environmental cost of microgrid, and use second-order cone relaxation and linearization methods are used to transform the bi-level model into a second-order cone programming and mixed-integer linear programming problem for solving respectively. Finally, the IEEE-33 node distribution network containing three microgrids is used as an arithmetic example for simulation verification. The simulation results show that the model improves the power quality of the ADN system while guaranteeing the economy of the multi-microgrids and verifies the feasibility and effectiveness of the bi-level optimization model.

Active distribution network, multi-microgrids, bi-level model, optimal operation.