Abstract
One way to increase the energy efficiency of AC electric locomotives with DC traction motors is to use converters on fully controlled semiconductor devices. Power circuit and control algorithm of active traction converter with two-zone voltage regulation are developed in this article. As an algorithm for controlling IGBT-transistors, rectangular-stepped pulse width modulation with a carrier frequency of 1200 Hz is used. The simulation of the active traction converter is performed in MATLAB. The results of the experiments showed that the power factor of 2EL5 electric locomotive with a new converter is 0.83...0.99 over the entire range of loads. This is more than for a thyristor rectifier. The THDi of the contact wire current is up to 13%. In further research, we must focus on finding ways to compensate for the higher harmonics of the voltage and current of an electric locomotive under PWM voltage regulation.
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