Optimal Capacity Configuration Of PV And Energy Storage Microgrid Based On Modularization Co-generation Device

Due to the increasingly significant role of microgrid technology in promoting renewable energy distributed power generation and achieving energy conservation and emission reduction,governments of various countries have constructed networked park PV energy storage microgrid in urban areas where electricity consumption is concentrated.With the specialization of user requirements and the diversification of AC and DC loads,The traditional optical storage co-generation system is facing great challenges.Through the commonly used in power system and function refinement of similar parts are classified in PV energy storage co-generation system,and the module structure optimization and centralized management and configuration are carried out respectively.Modular PV energy storage co-generation devices integrating standardization,modularization,serialization can satisfy the personalized needs of various microgrid scenario and shorten the production cycle.Therefore,it is necessary to optimize the capacity allocation of the park PV energy-storage microgrid based on the modular co-generation device.Firstly,this paper summarizes the research status of microgrid construction and capacity optimal configuration at home and abroad.Secondly,based on the analysis of source load storage characteristics and considering the port capacity and port power constraints of the modular PV energy-storage co-generation device and system energy flow,the port configuration model of the modular PV energy storage co-generation device was established to achieve the optimal power matching between the DC/AC module and the DC/DC module in the PV energy storage co-generation device.Considering the real-time operation state of the microgrid system is closely related to its capacity configuration,in order to ensure that the capacity configuration of the PV energy storage microgrid has better adaptability and economy to the system operation in the future,the coupling influence of the system economic operation is taken into account in the capacity planning stage of the optical storage microgrid.Based on the comprehensive consideration of the effect of charge/discharge ratio and depth on the life loss of the energy storage battery,the life loss of the energy storage battery was quantitatively analyzed to prolong the life of the energy storage battery and reduce the comprehensive cost of the microgrid system.Based on the above considerations,a two-layer model for the optimal configuration of the park PV energy storage microgrid capacity was established to optimize the installation capacity and power of photovoltaic and energy storage,the power matching between DC/AC modules and DC/DC modules in the PV energy storage co-generation device,and the charge and discharge sequence of the energy storage battery.An example is given to verify the effectiveness of the proposed microgrid capacity configuration model based on the topology of the modular co-generation devices,and to analyze the influence of the load characteristics of the park and the characteristics of the energy storage battery on the system operation economy and capacity configuration.In order to solve the problem of the mixing of planning variables and operating variables in the two-layer model proposed in this paper,the idea of layered decoupling is adopted to deal with it.Outer planning variables optimization by improved particle swarm algorithm,using the shannon information theory to improve particle swarm in information communication,dynamic adjusting swarm of inertia weights in each stages,can be effectively enhanced particle swarm optimization(PSO)algorithm of fast convergence and accuracy.Because of the time coupling constraint of the inner layer operating variables,a mathematical optimization method based on CPLEX was used to solve the inner layer mixed integer quadratic programming,and the optimal solution of the model was obtained through the interaction iteration of the inner and outer layers.Since the source-load uncertainty in the park PV energy storage microgrid system will seriously affect the safe and economic operation of the park microgrid system and the external public grid,it is necessary to consider the influence of source-load uncertainty factors in the capacity planning stage.Furthermore,the load control of the park is taken into account in the planning stage,and the output of the cooperative energy storage and the production load in the park is realized through direct load control.A robust capacity optimal configuration model of park PV energy storage microgrid was established based on the weak robust optimization theory.The example shows that the proposed robust optimization model can obtain a microgrid capacity planning scheme with certain economy and robustness,and the direct load control method can optimize the production plan of the park,which is helpful to reduce the power fluctuation of the grid-connected connection line and the capacity configuration cost of the park microgrid.Finally,based on the modular co-generation device,this paper optimizes the capacity configuration of the PV energy storage microgrid in the park,which is conducive to reducing the increased investment cost of the modular equipment in the microgrid and guiding the planning and construction of the microgrid project,which has certain theoretical significance and practical application value.