Principles of Control of a Single-Phase Direct-Current Electric Locomotive with Controllable Excitation Converters

Abstract To control a single-phase dc electric locomotive with controllable excitation converters, control principles have been formulated that make it possible to implement specified characteristics of independent or sequential excitation of traction motors. The presented control algorithm implements axis-based control of currents and traction force of an electric locomotive without disconnecting the power circuit of traction motors, which provides a constant traction force. The results of mathematical modeling of the operation of a three-unit ac electric locomotive are presented. The proposed control algorithm provides a smooth increase in the traction force of the electric locomotive to the specified values by sequential activation of traction motors.