Abstract
The widespread use of power converters in modern electric locomotives provides multiple opportunities for railway electric transport, one of them being smooth supply voltage regulation. For electric locomotives with smooth voltage regulation the overall efficiency of energy consumption is dependent on power factor of its power converters, both in traction and regenerative braking modes. Power factor of thyristor-based converters universally used on Russian railways remains to be relatively low. The paper presents a technical proposal to modernize the type AC-wire DC-motor electric locomotive power circuit by introducing a semiconducting discharge shunt in parallel with the subcircuit of rectified current, which allows for a revision of the traditional control algorithm of the converter’s thyristor arms. Mathematical modelling of the proposed circuit suggests a 4.6 % increase in converter power factor in traction mode and an 18.5 % increase in regenerative braking mode under nominal load conditions.
Published Version
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