| With the booming development of China’s economy,the pressure of urban transportation increases and traffic congestion is serious.Urban rail transit has become an ideal transportation means to relieve traffic congestion and improve the speed of urban development due to its advantages of low energy consumption,energy saving and environmental protection as well as large capacity.The power supply method of urban rail transit mainly includes two forms,contact network power supply and third rail power supply,both of which are through the static contact and dynamic friction of the collector device on the train with the overhead contact network or third rail to take the current and realize the closed loop of urban rail transit train power supply.Due to the harsh environment and uncontrollable environmental variables,it is difficult to systematically and deeply study the influence of current extraction parameters on the frictional sub-current wear through field tests.In order to solve the above problems,it is necessary to establish the bow network relationship simulation test bed and the third rail current extraction simulation test bed in the laboratory environment to study the relationship between the current extraction parameters and the current-carrying wear.The current-carrying friction test bed requires a test power supply with high reliability,high accuracy and low ripple to supply power to the pantograph-contact network and collector boot-third rail pairs to simulate the real traction current.According to the current-carrying operation requirements of the pantograph network and the third rail,a DC power supply system compatible with the power supply parameters of the two test benches is designed and developed,mainly consisting of a PLC control system,rectifier transformers,rectifiers and other hardware systems and a human-computer interaction software system developed based on Labview.The research shows that the power supply system and its software operating system can be effectively applied to the current-carrying wear test bed and provide the test bed with a highly stable,highly reliable,monitorable and remotely controllable test power supply.In this article,the power supply system of the current-carrying wear test bed is the object of research,and the rectification characteristics of the power supply system and the human-computer interaction function of the power supply system upper computer are studied as follows.(1)In view of the characteristics of urban rail trains subjected to current in actual service,a new DC power supply system solution is designed and developed,together with the design of water cooling system and fault warning system,etc.,which is applicable to the current-carrying wear test bed and provides stable and reliable test power for it.(2)To meet the actual needs of the test bed,a human-computer interaction system based on Labview is developed to realize real-time monitoring and remote control of the test bed through the human-computer interaction interface.(3)In order to realize the interconnection between the HCI system,the power supply hardware system and the test bed,a PLC control system was designed to complete the coupling between the three,so that any part of the test bed and its power supply system can be controlled by independent operation.(4)The performance of the power supply system was verified through theoretical analysis and simulation model building,and the designed power supply system was confirmed to provide high precision,high reliability,low ripple and other technical performance of the test power supply for the current-carrying wear test bed.(5)By formally establishing the current-carrying and wear test bed and its power supply system in the test room,the expected data were consistent with the test data during the actual test,while the various protection functions,early warning functions,monitoring functions,etc.were in line with the expected results and met the test requirements. |
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