Modeling and Analysis of Contactless Traction Power Supply System for Urban Rail Transit

By avoiding direct contact between the power supply and train, the contactless power supply technology can overcome the drawbacks effectively of disconnection, contact apart, line wear, lighting interference power, electric shock and other accidents of contact type power supply mode, which helps to solve the problems of power supply equipment redundancy and security, greatly improving the reliability of the power supply system. The contactless traction power supply system topological structure based on external power supply system of DC 1500V is put forward, the power supply model for rectifier sets, the energy converting device and primary transmitting coil and secondary pickup coil of the external DC power supply system are established. Four contactless power supply systems are simulated, the system stability is analyzed according to the variation of voltage gain and harmonic compensation network when the coupling coefficient changes, the transmission performance is analyzed according to input and output power and transmission efficiencym, different resonant compensation systems are selected and optimized. The SS-type system has the highest stability of frequency control, optimization of system frequency and load parameters can effectively improve the output power and transfer efficiency of the SS-type systems. Reaserch results shows that the SS-type syetm can achieve efficient wireless power transmission with high stability, which is the optimal choice of contactless power supply system for urban rail tramsit.