| With the increasing emphasis on renewable energy generation strategy in China,new energy sources with high penetration rates have started to penetrate distribution grids.However,compared with individual microgrids,the energy management of multi-microgrid system is more complicated,not only considering the complex interactions between sub-microgrids,between sub-microgrids and sub-microgrids,and between sub-microgrids and distribution networks,but also taking into account the generation and consumption characteristics of each sub-microgrid to amplify the advantages and compensate the disadvantages.It is also necessary to take into account the power generation and consumption characteristics of each sub-microgrid so that the microgrid cluster can amplify its advantages and compensate its disadvantages.In addition,it is not easy to manage the energy of a multi-microgrid system when the subgrids are constantly joining and dropping out,and the system structure is constantly changing.Firstly,we introduce the concept of system or system of systems(SoS)in the intersection of systems science and complex science to study the energy management of multi-microgrid systems,compare the characteristics of system and multi-microgrid,and study the feasibility of using system methodology to analyze the energy management of multi-microgrid systems.Secondly,the SoS architecture of the multi-microgrid system is established,and the mathematical model of the micro-sources inside the sub-microgrid and the two-layer energy management model of the multi-microgrid system are studied,and the scheduling plan of each sub-microgrid is solved with the objective of the overall economic operation of the multi-microgrid.Thirdly,based on the indicators such as the power transmission volume of sub-microgrids in the coordinated energy transmission of multi-microgrid system,the emergent revenue model and the emergent revenue contribution model are established,and the game solution method for the reasonable allocation of the emergent revenue of multi-microgrid system to the participating submicrogrids is given to improve the enthusiasm of sub-microgrids to participate in the coordinated dispatch.Finally,considering the behavior of sub-microgrids dynamically joining and exiting the multimicrogrid system during the scheduling of the multi-microgrid system,the dynamic behavior of submicrogrids is analyzed by means of graph theory in mathematics,and the impact caused by the dynamic behavior is added to the energy management model of the multi-microgrid system,and the characteristics of autonomy and internal robustness of sub-microgrids under the dynamic linking behavior are combined to reconstruct the distribution of emergent revenue The model is solved by the alternating multiplier method,and the effectiveness of the energy management scheme and the benefit distribution method is verified by simulation analysis.The simulation results show that the control strategy of the multi-microgrid system under SoS architecture can integrate the characteristics of each sub-microgrid in energy management,increase the local renewable energy consumption,reduce the power transmission between the multi-microgrid system and the distribution network,and reduce the impact of high penetration of renewable energy on the power quality and stable operation of the distribution network.The emergent characteristics of the multi-microgrid system under the SoS architecture and dynamic architecture can bring emergent revenue to the multi-microgrid system,and the reasonable distribution of the revenue promotes the sub-microgrids to participate in the coordinated energy dispatch of the multi-microgrid system. |
