Off line arc current detection and active control of pantograph-catenary system

The arc simulation test machine is developed, and the off-line experiments of pantograph-catenary system are carried out under different conditions. The total harmonic distortion rate of the contact current is used to characterize the transmission electromagnetic noise characteristics of the pantograph-catenary system, which concluded that the arc seriously affect the quality of the current, and the active control of the pantograph can ensure the pantograph-catenary system to maintain a relatively small wear rate and a high current carrying quality. The improved Hilbert-Huang transform(HHT) is used to analyzed the time-frequency characteristic of arc current. The results show that the arc is rich in harmonics, and as the change of current, there are different changes in amplitude and frequency. According to the two degree of freedom model of pantograph-catenary system, the feedback control law is designed by using back stepping control to solve the tracking problem of real-time contact force of pantograph-catenary system, and the virtual control stabilization function is analyzed. Simulation results show that the proposed control strategy can effectively solve the tracking problem of optimal contact pressure, and the tracking error of the system is globally asymptotically stable.