Research On Energy Optimization Management Method Of Interconnected Microgrids Based On Source-Grid-Load Interaction

With the increasingly severe problems of energy crisis and environmental pollution,microgrid has been developed rapidly as an effective way to utilize renewable energy.With the large scale of microgrid access to the grid,the multi-microgrid system formed by the interconnection and mutual supply of a number of adjacent microgrids has become a hot topic.In this paper,the characteristics of different grid structures are compared,and the hierarchical interconnected microgrid structure is determined.The operation characteristics and working principles of common distributed power in microgrid are studied,and the mathematical models of energy storage units such as wind and solar energy,diesel generator,micro gas turbine and battery are established,which will lay a foundation for future research.The development of smart grid,the use of electric structure changed significantly,promotion of smart meters,active load will make the power grid,wide area distribution quantity mass,the user is no longer rigid load power end,but to be able to participate in system operation through advanced measuring system,realize the interaction with the grid.This paper represents the transfer of load as the demand side management,optimizing management of energy and power supply side,distribution network,micro grid and demand side aspects,using the double optimization model,respectively network layer optimization model and optimization model of micro grid interconnection layer,based on the source grid load interaction the micro grid energy management optimization method.In the optimization of distribution network,microgrid can interact with distribution network,and interact with each other,and complete the energy optimization management of distribution network layer with demand side load.An economic optimization method,which takes into account the charge and discharge depth of the energy storage system,is proposed to realize the optimal output of each micro source and energy storage in the micronetwork.Finally,An optimization algorithm combining genetic algorithm with nonlinear programming is used to solve the mathematical model established.In view of the proposed hierarchical interconnection microgrid structure and the established energy management optimization model,a three micronet interconnection example is used to simulate the model.The MATLAB program is used to verify the proposed energy optimization management method.The simulation results show that the proposed energy optimization management method can achieve the optimal efficiency of the interconnected microgrid system and the optimal economic distribution of the microgrid.