Research And Design Of Small Photovoltaic Charging Piles

In the modern social life that advocates green travel,in order to avoid the pollution and emissions of automobile exhaust,electric vehicles have gradually entered people's lives and become an essential part of everyday travel.At present,the main source of electric power for electric vehicles in the market is the power grid.To be able to travel long distances must be able to meet the demand for power shortage at any time,and the key to restricting the development of electric vehicles is because of the reasons for charging restrictions,in the promotion of increasing the number of charging piles.At the same time,this paper proposes a new idea,that is,connecting photovoltaic power generation and charging piles,on the one hand in order to ease the pressure on the grid,and on the other hand to provide convenience for electric vehicles traveling in remote and underdeveloped areas.Photovoltaic power generation is a type of power generation that uses photovoltaic semiconductors to convert solar energy into photovoltaic energy through photovoltaic effect.It is the most widely used form of solar energy.It can be used as a system to generate electricity independently,and can also be used in parallel with the power grid to generate electricity.Broad prospects for development.The construction of photovoltaic charging units for electric vehicles is of great significance to the transformation of energy consumption structure in the future and the transformation and upgrading of the automobile industry.Based on this problem,the design of small photovoltaic charging piles was proposed.The basic principle is to apply photovoltaic arrays to convert solar energy into electrical energy to power the charging piles so that the electric vehicles can be charged quickly and efficiently.The main idea of this design is to use solar DC/DC converter to boost the dc bus to achieve maximum power tracking and meet the requirements of maximum power output.The charging pile system meets the needs of users by obtaining the required power from the dc bus.When rainy weather does not meet the need for power supply,the electric vehicle gets a small amount of power from the grid to meet the normal power supply.In the experimental design,according to the geographic environment of Rizhao,according to the principle of the photovoltaic charging pile and the charging mode of the electric vehicle,six 250 W photovoltaic panels were selected for series power supply to charge an electric vehicle battery with a capacity of 60V/120 Ah..The dissertation firstly studies the design of the photovoltaic charging pile system.Firstly,the types of photovoltaic cells and batteries are analyzed,compared and selected.The selected photovoltaic panels are simulated by Matlab/Simulink,and their basic output characteristics are mastered.The power battery has chosen the charging strategy.After theSTM32 microcontroller as the control core,the entire system was hardware and software design,including the overall design of the system,the design of the photovoltaic array,the design of the rectifier circuit and the design of the charging circuit,and parameters were selected for each part,and the software process the design of.Finally,the Matlab/Simulink simulation of the maximum power tracking Boost converter,VIENNA rectifier and full-bridge converter used in the previous design is carried out to verify the rationality of the experimental design and to understand the current and voltage output rules.After that,the entire photovoltaic charging pile system was set up and tested for charging.