A comprehensive analysis of a locomotive traction system including main alternator, bridge rectifiers, contactor, and DC traction motors

In the present traction system environment, the development of simulation models of traction equipment is a crucial task. This paper presents a novel dynamic modeling and digital computer simulation of a locomotive traction system in practical problems such as saturation of the magnetizing and leakage inductances in the generator equivalent circuits are included in the proposed method. An equivalent circuit including the eddy current losses of the DC traction motor is presented. A simple and fast model for simulating diodes is used to simulate the rectifiers dynamic behavior during parallel to series and series to parallel transitions. The required contactor for parallel or series operation of the two rectifier bridges is modeled as a nonlinear resistor. The simulation results follow the test results closely