| With the transitional exploitation of fossil energy,the energy problems and environmental crisis in the world are becoming more and more serious.The global renewable energy has been highly valued by all countries in the world because of its clean,pollution-free and high-efficiency characteristics.Micro-grid is an effective means to fully utilize renewable energy such as scenery,but the access of micro-grid such as scenery to micro-grid will affect the economic stability of micro-grid.Therefore,micro-grid with energy storage and flexible load It is important to study the operation optimization scheduling strategy and rationally configure the micro-source output to improve the safety,stability and economics of the micro-grid.With the further development of energy storage system and user side resource flexible load,collaborative scheduling based on energy storage and flexible load can play an important role in the optimal operation of microgrid operation.For the above reasons,the main work of this paper is as follows:(1)Firstly,the basic structure of the microgrid is described.The working principle of the fan,photovoltaic,energy storage and fuel cell in the microgrid is introduced and its mathematical model is established.The flexible load on the user side is classified and divided into two.The load and transferable load can be interrupted,and the time series model of the flexible load is established,which lays the foundation for the later research.(2)Secondly,the cooperative response of energy storage and flexible load is considered in the optimal scheduling of microgrid,and the minimum operation cost of microgrid(including microgrid purchase cost,fuel cost,energy storage charge and discharge cost and flexible load compensation cost)is established.The optimal economic dispatching model was built on the MATLAB/OPENDSS co-simulation platform to build a micro-grid operation optimization scheduling simulation platform.The improved particle swarm optimization algorithm was used to solve the problem.The analysis of different renewable energy penetration rates and the participation of flexible loads was carried out through examples.System scheduling and the impact of flexible load-adjustable capacity boundaries on the operating economy of the microgrid.(3)On the basis of the single-objective optimal economic dispatching model,the minimum operating cost of the microgrid,the minimum environmental cost and the minimum variance of the tie line power fluctuations are the optimization objectives,and the cooperative response considering the energy storage and the flexible load is established.The target optimization scheduling model is obtained by using the NSGAII(non-dominated sorting genetic algorithm-II)to obtain the Pareto optimal solution set,and then the optimal solution is selected based on the method of fuzzy membership function.Excellent solution.The results of numerical examples show that the microgrid multi-objective optimal scheduling model considering the cooperative response of energy storage and flexible load can comprehensively consider the economic,environmental protection and stability of micro-grid,and fully exploit the potential of micro-source and user-side flexible load to participate in micro-grid operation optimization.,to achieve global optimization.The results verify the effectiveness of the multi-objective optimal scheduling strategy in reducing micro-grid operating costs,reducing environmental pollution,and stabilizing tie line power fluctuations. |
