Study On Energy Dispatching And Storage Capacity Configuration Of PV Microgrid

Energy storage technology is now one of the key technologies of smart grid,green clean new energy network,electric vehicle and even energy Internet.It can not only achieve the demand side management,eliminate the instability of the renewable energy generated by the peak and valley difference,smooth with a random load,but also can improve the efficiency of power equipment,power generation costs and the overall power network operation stability.It is an effective way to solve frequency adjustment and compensate load fluctuation.A reasonable configuration of energy storage system in a project can match the PV system and as much as possible to reduce the pre-construction investment and post-maintenance costs at the same time,which is of great significance for the promotion of new energy sources.Based on the llOkW PV micro-grid project as the experimental platform,this paper mainly studies the configuration of the hybrid-energy storage capacity of PV micro-grid.Considering the two kinds of energy storage system into the micro-grid energy storage system model,based on the historical data of the model area,the photovoltaic output prediction is carried out.Then analyze the load type,predict system requirements and load priority.Then through the statistics,the use of discrete random variables probability density function method to find the optimal storage capacity to meet the constraints.Firstly,the paper introduces the background of micro-grid systems,noting the importance,study and practical value that new energy distributed intelligent micro-grid in the era of energy crisis,introduced the development of photovoltaic power generation industry at home and abroad.After that energy storage technology and energy storage basic needs to be discussed.Secondly,a mathematical model and its working characteristics of the photovoltaic cell are analyzed in detail,and a simulation model of the photovoltaic cell is established.At the same time,analyze the lithium ion battery and super capacitor model,single energy storage model is established.Thirdly,the characteristics of PV microgrid output based on environmental factors are studied.The paper presents a capacity allocation using the power difference probability into the composite energy storage,based on the prediction of PV system output and system load,while ensuring critical load operation.After determining the optimization goals and constraints,use the YALMIP toolbox for standard optimization.Finally,combined with the school 110KW project,a case study shows that the rationality of the composite storage capacity configuration.Micro-grid hybrid storage capacity configuration more dependent on engineering experience,lack of theoretical guidance and quantitative standards.The article uses the compound storage capacity allocation method to optimize the economy as the main optimization target,taking into account the reliability of the important load in the load in the meantime.The results of this study can provide a technical reference for the method of configuring the hybrid energy storage capacity of PV systems.However,in practical application,due to the situation will be more complex,a composite energy storage system configuration method this paper presents remains to be further studied.With the continuous development of science and technology.With the continuous development of science and technology,energy storage materials and energy storage technology innovation,the continuous promotion of smart grid,engineering experience continued to accumulate,a energy storage capacity configuration program which is more accurately to fit the system needs can be predict.