Research On Field Automatic Test Technology For Electric Vehicle Charging Facilities

With the continuous development and promotion of electric vehicles,the State Grid Corporation and electric vehicle-related companies have built a considerable number of charging facilities in order to meet the growing charging demand of electric vehicles users.However,more and more charging accidents have occurred intensively,making people pay more and more attention to the safety and reliability of electric vehicle charging facilities.At present,there are still many problems in the actual operation of charging facilities.Among them,the most representative are the substandard electrical performance problems caused by design flaw and the compatibility problems caused by inconsistent communication protocols.In order to eliminate the hidden dangers while charging and protect the interests of electric vehicle users as well as the charging facility operators as much as possible,it is necessary to strengthen the testing and maintenance of charging facilities and timely discover potential problems in charging facilities.With the continuous innovation of detection technology,it is now possible to perform comprehensive tests on charging facilities under laboratory conditions with higher detection accuracy and more complete testing items.However,it is unrealistic to return all the charging facilities in operation to the factory for inspection,which not only consumes time and energy,but also greatly reduces the overall utilization of the charging facilities.All the above questions illustrate the urgency of in-depth research on field test technology for charging facilities.Considering the testing requirements for field test of charging facilities and the limiting factors of environmental conditions comprehensively,this thesis analyzes and determines the detection indicators suitable for field test of charging facilities,and designs different field automatic test schemes for various indicators.This thesis also studies the management method of test data,the corresponding test log files can be obtained automatically after the related indicators are detected.For the field communication test indicators of charging facilities,this thesis studies the communication methods and communication processes between electric vehicle charging facilities and battery management systems,and designs a technical solution which uses CAN communication technology to obtain the communication information between charging facilities and battery management systems in real time during charging.A test software was developed based on the test platform.It was verified that the developed program can monitor,analyze,and record the charging process automatically by conducting field tests on the charging facilities of three different companies,which has certain practical value.For the field electrical performance test indicators of charging facilities,this thesis selects smaller and more integrated test equipment to build a hardware platform,and a test application was developed considering the aspects of automatic control of the test process,automatic storage of test data,and automatic generation of test reports.The system is used to test the electrical performance of A vehicle-mounted charger,and the obtained test data can evaluate the electrical performance of the charging facility reasonably.