Research On Contactless Power Converter Of Rail Transit

The train of urban rail transportation usually adapt the way of contacting current-receiving to power the motor, air conditioner, lighting and other devices. There are some disadvantages in contacting current-receiving power mode, such as spark, scurf, wear and so on. Especially in some special cases, for example the tramcar of mine, spark may cause the dangers such as explosion accidents. Therefore the features of contactless power supply technology makes it unusual, this paper apply it to power supply of the train of urban rail transportation.Firstly, the operating principle of non-contact inductive power supply system is researched in this paper. And focus on the theoretical research on contactless transformer, considering some situations may require multiple receiving coils, analyzed the T equivalent circuit of multiple receiving coils.Secondly, in view of the current type and voltage type contactless power supply converters, the two converters are introduced in detail separately, and analyze the applications, advantages and disadvantages of these two converters. Combined with the experiment platform, the voltage type contactless power supply converter is chosen in this paper. Design the voltage type contactless power supply converter, analyze the contactless transformer’s low coupling, there is large leakage inductance, in this paper the SS (original, deputy series) compensation to offset the leakage inductance of the reactive power and voltage drop is adopted. When resonance oscillation takes place, on both ends of the coils voltage and current phase is the same, the state achieves zero current shut down, reduces switching losses. The main circuit simulation is built by MATLAB/simulink to validate the simulation, single receiving coil and multiple receiving coils are simulated, and the simulation results are consistent with theoretical analysis.Finally, accomplish the construction of experimental platform, device selection and debugging of the test results. Combined with the existing conditions of the laboratory, this experiment platform can realize power output about1kw of contactless power transmission.