Research On Control Strategy Of Wind-Solar-Storage DC Microgrid For Off-Grid Operation

With the beginning of the industrial age,the global economy has entered a state of rapid development,but also brought energy shortage and environmental pollution aggravation problems.Relevant scholars have successively invested in the research of new energy power generation,using clean energy such as wind and solar power to generate electricity.This kind of power generation is clean and pollution-free,and it gets rid of the bondage of existing fossil energy.It is in line with the concept of global development and has gradually attracted the attention of countries around the world.This paper focuses on the research of the new wind-optical-storage DC microgrid,mainly including the principle of wind and solar power generation and the maximum power tracking algorithm,the charge and discharge control of the energy storage system and the comprehensive simulation experiment.First of all,this paper introduces the research background of wind-solar power generation and the development status of micro-grid,and leads to the work to be done in this paper for the off-grid wind-solar storage DC micro-grid research institute.Secondly,this article,in turn,this paper introduces the principle of photovoltaic power generation,the equivalent mathematical model and the current more efficient variable duty cycle disturbance maximum power point tracking methods,and establish the corresponding Simulink simulation model for data validation,likewise,for wind power generation system is introduced the corresponding components,working principle and variable step disturbance observation maximum power point tracking methods,also in Simulink simulation model and according to different environment;Again,this paper introduces the working principle of lead-acid battery energy storage system,the charging and discharging control method,which leads to the energy storage system USES voltage and current double closed loop PI control strategy,set a different work environment and battery reference indexes,through the model simulation,observe the simulation results,the author analyzes the reference coefficient of energy storage system output value.Finally,understand the scenery storage principle and control method on the basis of integrating three parts into a dc micro grid system,according to the macro control policy of the micro power grid as multiple choice model,and according to different environment to the actual situation of micro grid simulation,to observe and contrast the main parameter is in line with the theory of micro grid requirements,mainly including the output power of wind,light,and energy storage,and bus voltage stability and battery state of charge and charge and discharge of the state,to verify the correctness of the model and practical feasibility of micro power grid.