A new control technique enabling dual-feeding of 50 Hz AC railways with static converter feeder stations

This paper investigates the control techniques required to enable dual end feeding of 50 Hz AC railways with static converter feeder stations. Static converters are the future for railways for several reasons such as the possibility to control the voltage magnitude and phase angle, topologies with no or small filtering required and no imbalance caused for the utility network. Without any control of the voltage of the two feeding points, the train draws a percentage of power that is substantially inversely proportional to the distance from each substation, while if a control system is designed and used the train can draw 50% of its required power from each substation regardless of its distance from either. This will help reducing the rating of the future static converters and also to enhance the capacity with the current ratings. This paper presents the results of initial control system calculations for a single train between two static converter substations using MATLAB.