Optimal Management And Control Of Microgrid Energy System Based On Virtual Energy Storage

With the rise of new energy technology and Internet technology which are the representatives of the third industrial revolution,the development and utilization of new energy sources has become a hot topic in the field of energy.In order to accept more and more distributed renewable energy,the application scope of microgrid is more and more extensive,and increasingly reflect its good comprehensive benefits and market prospects.Microgrid can effectively integrate all kinds of distributed clean energy and achieve reliable,flexible and economical power supply.The energy management is an important part in the research of microgrid,reasonable energy management and integrated control can improve the energy efficiency,economical efficiency and stability of the whole microgrid system,and achieve the goal of self-protection and self-management of microgrid system.Energy storage system plays an important role in the energy balance of the microgrid.This paper will use the concept of virtual energy storage to extend the range of energy storage system from the perspective of the controllable load category of demand side and make a further research on the energy management and control of microgrid.The main contents are as follows:1.The basic concepts and key technologies are introduced and this paper expounds the basic functions of the microgrid energy management system and its important research contents.The steady state simulation model is established for the microgrid system,which contains the mathematical model of wind turbine,photovoltaic array,storage battery and temperature control load to lay the foundation of the model for the subsequent development of energy management strategies.2.An energy management strategy based on virtual energy storage is proposed for the independent operation of the microgrid system.The virtual energy storage in the system is defined and the running time of the temperature control load and the transferable load can be adjusted flexibly with the change of the output power of the wind turbine and the photovoltaic array through the demand side load management,this will not only maximize the use of wind power,but also play the role of energy buffer by making use of the characteristics of thermal storage and heat storage,and reduce the demand for energy storage capacity of microgrid system.3.For microgrid system which is connected to traditional power gird,add TOU strategy on the basis of the research of the independent wind and micro grid system,an energy management strategy is established for microgrid system.Taking the minimum purchase cost as the target,a simulation example is carried out under the premise of satisfying users' comfort.The results show that the proposed strategy is more economical and can reduce the demand for capacity allocation of energy storage systems.4.Finally,make a summary of the work and put forward the directions for further research.