Research On Coordinated Control Strategy Of Multi Micro Sources In Microgrid

Environmental and energy issues have become a global problem.Building a safe and clean energy interconnection network is a way to solve the current social development and environmental and energy relations.Now countries have proposed energy conservation and emission reduction policies,and actively develop wind energy,solar energy,etc.New energy enters the distribution network.The microgrid,which is composed of new energy power generation,has become the main way for countries to supply electricity to new energy sources.Based on the research of traditional power-off and power distribution,this paper uses wind-solar hybrid power generation system,battery and super-capacitor hybrid energy storage system and load DC micro-grid as the research background,and analyzes the micro-grid with new energy and scenery.The hybrid micro-grid hybrid energy allocation control strategy is studied,and the working mode of the DC micro-grid is analyzed.The energy management strategies under various working modes are given.Firstly,this paper summarizes the research background and significance of this paper,analyzes the current situation of micro grid research and energy management at home and abroad,analyzes the basic working principle of photovoltaic cells and establishes the mathematical model of photovoltaic cells,analyzes the wind speed characteristics of wind farms and the characteristics of wind turbines,designs an important part of energy storage system in the micro grid system,and establishes the model of energy storage unit At the same time,using Matlab / Simulink simulation to analyze the working characteristics of two kinds of energy storage elements;Secondly,the bus voltage control strategy and the power fluctuation control strategy of the micro grid composed of wind,light and storage are studied emphatically.Based on the traditional droop control algorithm,the hybrid droop control strategy based on the hybrid energy storage SOC is proposed,and the mathematical model of the improved droop control strategy is constructed.The hybrid energy storage of the micro grid is built based on MATLAB / Simulink simulation software The voltage droop control is based on the simulation model,and the correctness of the improved next control strategy is verified by simulation;Finally,the coordinated control strategy of multi-source micro grid is studied.Based on the coordination control strategy of voltage droop method and integral droop method,the hybrid energy storage and distribution strategy in different operation modes of multi-source micro grid is proposed,and the energy management coordination strategy of multi-source micro grid is proposed on the basis of hybrid energy storage and distribution strategy;on the basis of building the energy management coordination strategy of multi-source micro grid,based on MATLAB / Simulink simulation The real software carries on the simulation model research under three operating conditions of multi-source micro grid before and after the improvement of droop control method.The simulation shows that the new hybrid coordinated control strategy can realize the battery balance and prevent the battery from overshoot and over discharge,so as to verify the correctness and effectiveness of the hybrid energy distribution control strategy of DC micro grid.