Research On The Optimal Configuration And Protection Of The Optical Storage Capacity Of Photovoltaic Charging Stations For Electric Vehicles

With the increasingly prominent problems of environmental pollution and energy crisis,the development of a "low-carbon economy" has become a code of conduct for all walks of life.Electric vehicles have quietly emerged in the automotive industry.In order to better promote the pressure of electric vehicles to alleviate the two major problems,it is inseparable from the construction of supporting charging facilities.This thesis researches the primary wiring scheme of photovoltaic integrated charging stations,the optimization of the capacity of major equipment in the station and the configuration design of protection schemes.And this thesis mainly studies from the following aspects:First of all,this part combines the electrical design flow of the PV charging station and introduces the PV system composition,typical structure,types of PV charging station and operating mode.Then it analyzes the installation method of PV,the size of PV capacity and the selection of major equipment.At last,this part designs a type photovoltaic power station layout for a large-scale photovoltaic electric vehicle charging station.Then,the main equipment capacity in photovoltaic integrated charging station is optimized by using NSGA-II multi-objective in the second part.It reduces the construction and operation maintenance costs of charging stations while maximizing the proportion of photovoltaic power generation utilization,and studys the optimization of capacity between photovoltaic cells and energy storage cells.The rationality of the model was analyzed through an example,and the different configuration schemes were compared and analyzed.The optimal optical storage capacity allocation scheme suitable for the example was obtained.Finally,the protection scheme of the photovoltaic integrated charging station is studied and analyzed in this part.It analyzes the traditional charging station transformer,10kV incoming line,inverter protection and uses MATLAB/simulink simulation software to set up the simulation model of photovoltaic power generation system and electric vehicle charging station system.Then the current and voltage changes in different short circuit fault types is analyzed by the simulation model.This part focus on the influence of short-circuit current distribution in photovoltaic access charging stations at short circuit in different locations and proposes an improved protection scheme for the photovoltaic charging station.The improved protection scheme enhances the operational reliability of the photovoltaic integrated charging station.This thesis focuses on the design and protection of photovoltaic integrated electric vehicle charging stations.It realizes the optimal allocation of equipment capacity in the charging station and puts forward a reasonable improvement protection scheme.The realization of on-site consumption of photovoltaic resources,the improvement of economic performance in construction and the guarantee of reliability are in line with the needs of sustainable development in society,and provide theoretical guidance for the construction of an actual photovoltaic storage type charging station.