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A MATHEMATICAL MODELING OF AC ELECTRIC LOCOMOTIVE WITH ACTIVE CONVERTER IN TRACTION

Authors: Krasnov, Oleksii;

A MATHEMATICAL MODELING OF AC ELECTRIC LOCOMOTIVE WITH ACTIVE CONVERTER IN TRACTION

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.

Разработана математическая модель электровоза переменного тока, оборудованного активным тяговым преобразователем с двухзонным регулированием выпрямленного напряжения. Электромагнитные процессы исследованы в режиме тяги при алгоритме широтно-импульсной модуляции по прямоугольно-ступенчатому закону. Установлено, что коэффициент мощности электровоза с активным преобразователем составляет 0,83…0,99. Применение таких преобразователей позволяет повысить коэффициент мощности электровоза с коллекторными тяговыми двигателями.

Розроблено математичну модель електровоза змінного струму, обладнаного активним тяговим перетворювачем з двозонним регулюванням випрямленої напруги. Електромагнітні процеси досліджено в режимі тяги при алгоритмі широтно-імпульсної модуляції за прямокутно-ступінчастим законом. Встановлено, що коефіцієнт потужності електровоза з активним перетворювачем становить 0,83…0,99. Застосування таких перетворювачів дозволяє підвищити коефіцієнт потужності електровоза з колекторними тяговими двигунами.

Keywords

математическая модель, математична модель, електровоз змінного струму, active traction converter, электровоз переменного тока, активный тяговый преобразователь, 621.314.5, широтно-импульсная модуляция, pulse-width modulation, широтно-імпульсна модуляція, 629.423, AC electric locomotive, активний тяговий перетворювач, mathematical model

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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