Abstract: Aiming at the economic dispatch problem of islanded microgrid cluster, a distributed economic dispatch method for microgrid cluster based on consensus algorithm is proposed. In this method, the economic dispatch of islanded microgrid cluster is modeled as two layers:inter-sub-microgrids dispatch layer and sub-microgrid dispatch layer. The inter-sub-microgrid dispatch layer selects the incremental cost of sub-microgrid as the consensus variable, and the average consensus algorithm is used to solve the model, so as to optimally allocating the power of mutual assistance between sub-microgrids under the mode of mutual assistance. The inter-sub-microgrid dispatch layer regards the incremental cost of each distributed generation as the consensus variable, and takes the mutual power allocation between inter-sub-microgrids as the constraint, leader-following consensus algorithm is used to solve the model. This method is realized by two-layer dispatch, which can give full play to the advantages of power mutual assistance between inter-sub-microgrids while maintaining the independence of sub-microgrids.Moreover, this method only needs to use local information interaction to achieve optimal dispatch, it has high flexibility. Finally, the effectiveness of the proposed distributed economic dispatch method is verified by numerical simulations.

    Key words: microgrid cluster; economic dispatch; consensus algorithm; distributed optimization