A stability analysis on the regenerative brake control system focusing on feeder line circuit models of DC-electrified railway

In this paper, stability of regenerative brake control system is studied, focusing on the difference in the feeder line circuit model on factory test conditions and actual load conditions. The factory test is always carried out to determine the gain of regenerative brake control system because there are restrictions in the on-track test. However, the influence on the difference of the circuit configurations on the stability of the traction circuit and suppression of overvoltage has not been studied. In this paper, the authors revealed that the factory test condition is equivalent to the actual condition from the viewpoint of stability of traction circuit from the analysis on the pole assignment of the closed-loop transfer function of each models. Also, these results of theoretical analysis are verified by the numerical simulation. From results of this paper, it is theoretically revealed that the stability of the traction circuit in the actual condition could be guaranteed by the factory test. This paper contributes to reduce the process for tuning the gain of the regenerative brake control system in the on-track test.