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
Related Articles
- EP ID EP415279
- DOI 10.18664/1994-7852.179.2018.147714
- Views 71
- Downloads 0
REFINEMENT OF DYNAMIC MODELS OF THE ROD SYSTEMS
The author considers the possibility of applying methods for reducing the dimensionality of dynamic models to rod systems with many degrees of freedom. The research object is the latticed tower. It should be noted that t...
MULTIPARAMETRIC OPTIMIZATION OF THE COMPOSITION OF PAPERCRETE
In the article provides a brief overview of the specific features of cellulose-containing aggregates of plant origin. The degree of influence of these features of cellulose-containing aggregates of plant origin on the pr...
DEVELOPMENT OF MEASURES FOR THE PROTECTION OF STRUCTURES OF RAILWAY TRANSPORT AGAINST ELECTROCORROSION UNDER ACTION OF ALTERNATING CURRENT LEAKAGE AND HIGH-VOLTAGE TENSION
The destructive effects of the corrosive effects of stray and leakage currents are observed in almost all industries. The question is the most relevant for the railways. It is known that direct (DC) leakage currents and...
BASES OF CALCULATION OF REINFORCED CONCRETE ELEMENTS AND STRUCTURES ACCORDING TO THE DEFORMATION AND POWER MODEL OF RESISTANCE
The article deals with the basic provisions of the universal calculation method of reinforced concrete elements and structures according to the deformation and force model of their resistance. Particular attention is foc...
PECULIARITY OF PROJECT AND CALCULATIОN OF SYMMETRIC SWITCHES FOR RAILWAY AND INDUSTRIAL TRANSPORT
Equilateral switch is switch with all elements are arranged symmetrically relative to the axis of the main path. Equilateral switches are widely used in marshalling-yard bays stations, because they work in cramped condit...