Research On Optimal Operation Of Multi-energy Microgrid Cluster Based On Energy Interaction And Cooperation

With the further development of the energy Internet and smart grid,the proportion of user-side distributed power sources has further increased,and the further integration of multiple types of energy will effectively improve the reliability of the energy system,the complementarity of energy conversion,the coordination of energy use environments,and the economy of cluster operation.The researchers put forward the concept of multi-energy microgrid.It operates in an integrated manner of source,grid,storage,and load of multiple types of energy,and provides a feasible solution with good development prospects for the interconnection,interaction,and mutual assistance between different energy systems such as electric power-heat-gas.In addition,the horizontal operation characteristics of multi-energy complementation and mutual backup between multi-energy microgrids and the vertical coordination characteristics of network group sharing and overall coordination can realize economic and reliable operation of energy system clusters in the region after coupling,which can improve energy efficiency And provide greater system adjustment flexibility.However,what kind of cluster operation strategy should be adopted between multi-energy microgrids,what degree of multienergy complementary effect can be achieved,and what scale adjustment flexibility can be achieved in practice still need to be further studied.Therefore,this paper aims at the problem of low energy utilization efficiency and adjustment flexibility caused by the limitation of installed capacity and operation mode of a single operating multi-energy microgrid.It is based on the power balance model of the multi-energy microgrid based on the decision quantity of energy conversion behavior.In the above,a multi-energy microgrid cluster operation strategy derived from the evolutionary cooperative game theory is proposed.Through the energy interaction and coordination between the network clusters,it provides greater adjustment flexibility for the power and gas systems.The specific research content is as follows:(1)First,aiming at the topological structure and energy flow characteristics of the multi-energy microgrids,analyze the correlation between the operating characteristics of the multi-energy microgrids distributed energy supply system,energy conversion and energy storage system and the multi-source load module,and establish the corresponding energy input-Output model to clarify the energy relationship between the components of the multi-energy microgrids and the overall microgrids;then through the analysis of the conversion characteristics and energy supply paths between the various types of energy in the multi-energy microgrids,it is proposed to describe the energy conversion of the microgrids The 0-1 decision quantity of the behavior and the corresponding decision set are established.Based on the 0-1 decision quantity and the energy distribution coefficient,the multi-energy microgrids power balance matrix is formed,and finally the description of the power balance relationship of the multi-energy microgrids under different energy types is realized.Subsequent energy interaction and coordinated dispatching of multi-energy microgrid groups lays the foundation;(2)On the basis of the multi-energy microgrids power balance model,in order to meet the multienergy complementation and economic requirements within the microgrids cluster system,a multienergy microgrids cluster system energy interaction coordination strategy is proposed.From the perspective of the multi-energy microgrids cluster system topology and energy transmission and operating characteristics,firstly establish the topological structure of the multi-energy microgrids cluster system at the physical level;The self-demand and operating characteristics of the energy microgrid,the analysis of the energy interaction coordination process and participation rules within the multi-energy microgrid and between the multi-energy microgrid,considering the adjustment willingness and operating status restrictions of the multi-energy microgrid to participate in the cluster Multi-energy microgrids cluster system energy interaction strategy,establish a multi-energy microgrids cluster energy interaction coordination model under the evolutionary cooperative game,and optimize the energy interaction process of the multi-energy microgrids cluster system with the goal of overall energy balance and operating economy;(3)Finally,in order to meet the adjustment needs of the power and natural gas backbone network during actual operation,it further stimulates the potential adjustment ability of the multi-energy microgrids cluster system to the external energy system.Based on the energy interaction strategy,this paper gives four typical operating scenarios in turn,establishes a multi-energy microgrids cluster system optimization model that can meet the adjustment needs of the main energy network under different operating modes,and introduces a small calculation amount and good solution convergence.And the NSGA-Ⅱ-RLS algorithm of solving speed,under the premise of meeting the energy system regulation needs,through the simulation analysis of the energy interaction between the multi-energy microgrid,the cluster system and the backbone network,the cluster system adjustment is realized.With the improvement of flexibility and energy efficiency,the model and strategy of the multi-energy microgrid cluster system proposed in this paper are verified by simulation examples.