Design Of Intelligent Charging Pile For Electric Vehicle And Research On Its Key Technology

With the rapid development of new energy vehicles,the basic power supply facilities construction seriously lagging behind.It is difficulty in charging and maintenance,so an intelligent and modular charging pile for electric vehicle which can realize cluster management and monitoring dispatch is put forward.In this paper,the design of intelligent electric vehicle charging pile is studied,and its centralized management mode and multi-pile power distribution method are introduced.Firstly,the requirements and functions of the electric vehicle smart charging pile are analyzed to determine the basic design parameters.The module is designed based on LPC1769 intelligent charging pile.It is divided into three modules:functional structure module,human-computer interaction module and safety protection module.In this design a variety of communication interfaces are designed to achieve intelligent real-time monitoring which can improve the use of security.At the same time the design also integrates RFID radio technology,liquid crystal display,status indication,embedded printing and other human-computer interaction elements,that makes human-computer interaction more intuitive.Secondly,the intelligent human-computer interaction interface software design of the charging pile is divided into APP layer,BUSS layer,COMP layer and DRV layer,and the interaction prototype and operation flow are designed.Thirdly,the intelligent charging pile communication protocol is designed on the basis of the IEC104 protocol.The charging pile data is sent to the concentrator through MODBUS RS485 serial port communication protocol,and then sent to the network server by GPRS.Through the above way,the intelligent charging pile cluster management and monitoring dispatch is realized.Finally,a multi-pile power distributionmodel is established with the main factors such as battery SOC,charging mode and electric vehicle access quantity.And then obtain the Gini coefficient under each influence factor to be weighted and optimized.A power distribution method of regional multi-pile power system based on Gini coefficient is obtained.This method reduces the battery loss caused by insufficient power at the peak of the charge,and the fairness of power distribution has been taken into consideration.