On-line simulation of voltage regulation in autotransformer-fed AC electric railroad traction networks

Simulation algorithms to model the voltage distribution characteristics in AC autotransformer-fed railroads with single- and double-end supply are described. The theory is based on the solution of algebraic equations for a single train, moving along a track section represented as a coupled transmission line. The simulation was implemented on a PC with continuous displays of the catenary and rail voltages, and an historical record of the train voltage for movement at constant speed along the section. The simulator enables rapid parametric analyses to be made in order to optimize the power feeding arrangement, and sample displays of catenary, rail, and train voltages are given for single train operation under constant current and constant power