Research On Economic Optimal Scheduling Of Wind/Solar/Battery Hybrid Micro-grid

With the development of power generation technology and the exhaustion of energy at the world level,the voice of energy saving,emission reduction,environmental protection and the use of clean energy instead of fossil energy in the world is also increasing.On this basis,the use of clean energy has become a hot issue in recent.In the process of studying micro-grid,the randomness,indirectness and uncontrollability of power sources,such as wind and solar power,have brought great pressure to the safety and stability of power system.The establishment of wind/solar/battery hybrid micro-grid system is one of the important means to solve the above problems.It can not only guarantee the safety and reliability of power system,but also increase the economic benefits of micro-grid by means of regulation.On the basis of consulting many domestic and foreign documents,the modeling,analysis and simulation verification on the wind/solar/battery hybrid micro-grid are proposed.This paper focuses on the establishment of the micro-grid model and the economic optimal scheduling under the mode of grid connected to the micro-grid.The main work of this paper is as follows:(1)The structure of the micro-grid is analyzed in detail.Based on the understanding of micro-grid theory,the research status of micro-grid at home and abroad is summarized.This paper focuses on the problems of stability and economy of micro-grid,and puts forward the significance of economic operation under the premise of ensuring stability.It also sorts out the research contents and logical connections of the full text.(2)In order to achieve the best return of micro-grid,three common power models,including wind module,photovoltaic module and energy storage module,are built and coupled,and a complete wind solar storage complementary micro-grid model is built.(3)On the basis of establishing the mathematical model of the micro-grid,the best revenue model of the micro-grid is established based on the power exchange between the large grid and the sale profit of the micro-grid.The model takes full account of multiple constraints to achieve the economic dispatch of micro-grid,including the operation characteristics of fans,photovoltaic characteristics,the constraints of energy storage system,and the balance of exchange with large grids.(4)First,the particle swarm optimization(PSO)is used to optimize the target function.Then the chaotic particle swarm optimization(CLSPSO)is proposed by replacing the common search process in the ergodic process of chaotic orbit.Finally,the simulation experiment of the proposed method is carried out,and the calculation results verify the effectiveness of the proposed method.