A MATHEMATICAL MODELING OF AC ELECTRIC LOCOMOTIVE WITH ACTIVE CONVERTER IN TRACTION
Journal Title: Збірник наукових праць Українського державного університету залізничного транспорту - Year 2018, Vol 179, Issue 13
Abstract
One of the ways to increase the power factor of AC electric locomotives with DC traction motors is the use of converters on fully controlled semiconductor devices — active current source rectifiers. However, the modes of operation of the active current source rectifier as a DC voltage regulator have not been studied enough today and require further investigation. In this article, a mathematical model of an AC electric locomotive with an active traction converter (based on the eight-axle freight AC locomotive 2EL5) with two-zone regulation of the DC voltage is developed. The model of the “traction network — electric locomotive” system is presented in the form of differential equations. The algorithm of the active converter control system is described by logical switching functions. The converter uses a unipolar rectangular-stepped pulse width modulation with a carrier frequency of 1200 Hz. Computer modeling of electromagnetic processes in the traction mode is performed. The oscillograms of voltages and currents show the process of transition from the first control zone to the second one. According to experiments, the power factor of an electric locomotive in the entire control range is 0.83...0.99. This is more than a thyristor converter. The THDi of the trolley wire current is about 9...10%. Analysis of the trolley wire voltage and current waveforms showed that a decrease in the modulation index has a negative effect on the voltage and current harmonic distortion. Further research should focus on limiting the higher harmonics of voltage and current when adjusting the voltage. The practical result of the use of active traction converters on electric locomotives is a reduction in the consumption of electric power for the traction of trains.
Authors and Affiliations
Oleksii Krasnov
Keywords
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- EP ID EP415279
- DOI 10.18664/1994-7852.179.2018.147714
- Views 70
- Downloads 0
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