The summary and keywords
Analysis of method error of analog-to-digital conversion of the motion speed of rolling stock by formation of logical link
Baranov L., Evseev D.
The analysis of statistical and dynamic method error of analog-to-digital conversion of the motion speed of the rolling stock with pulse-frequency sensors of rotational speed of mounted wheels was given. There was considered the method of statistical error reduction of conversion. The possibility of dynamic error of reduction analog-to-digital conversion of the speed by virtue of integration of logical link of conversion was proved. There were received the analytical expressions for calculation of method error of analog-to-digital conversion by determinate and stochastic models of incoming signal. The using of logical link in methods of analog-to-digital conversion of the motion speed make possible to strike a happy medium between statistical and dynamic error which run effectively tracts of speed measurement in the management, diagnostic and railroad traffic safety systems.
Keywords: analog-to-digital conversion, motion speed, pulse-frequency modulator, rotational speed, statistical methodic error, model of the signal, autocorrelation function of signal, logical link of conversion, reduction of statistical and dynamic error, calculation of error estimates.
Switching frequency management for temperature control of traction semiconductor devices
Kosmodamianskiy A., Strekalov N., Pugachev A.
The brief survey of techniques of traction frequency converters power semiconductor devices cooling is presented. The advantages and drawbacks of technical approaches and schematic solutions applied nowadays are highlighted, the suggestions for its improvements without significant interventions into design and topology are proposed. The additional techniques to control semiconductors temperature of frequency converters of traction rolling stock are laid out. The temperature control system with using of semiconductors frequency switching as a regulatory reference and applying of deviation of semiconductor temperature from the reference on average temperature is developed and investigated. The results of simulation in MATLAB are shown and discussed.
Keywords: frequency converter, temperature, cooling system, power losses, switching frequency, simulation.
Development of a filter reactor with a closed magnetic flux for DC traction substation
Bader M., Dozhina G., Lobyntsev V., Dmitry D., Dinisilov A.
At present, railroads traction substations use reliable, yet obsolete filter reactors of the RBFA-U type. These reactors have an open design and are characterized by a significant level of losses reaching several hundred kilowatts. New design solutions, as well as modern calculation methods, allow to design a filter reactor with a completely closed magnetic flux in an armored rod cylindrical magnetic system. The paper discusses the proposed design solutions used in the development of an energy-efficient smoothing reactor with previously unattainable performance characteristics with a 2-3 times increase in the energy density per volume.
Keywords: filter reactor, electrical substation.
Electrical equipment for high-speed trains of prospective electric traction system
In’kov Y., Glyzin I.
The article considers the methods of implementation of the perspective electric traction system of trunk railways in Russia. To ensure smooth and efficient movement of heavy freight and high speed passenger trains the most promising is the system of the electric DC traction with the voltage in the сatenary system 18-24 kV. The task of creating a high voltage traction power system with the DC сatenary system with the existing equipment base of power electronics can be solved simply. Whereas the creation of energy efficient static converters of electric power for prospective electric rolling stock on the basis of hybrid systems IGBT- modules requires the solution of numerous theoretical and practical problems. Since the voltage of the asynchronous traction motor can't be higher than 3.0 kV, a matching transformer with a high frequency voltage must be installed in a static converter. The article considers performed at a high frequency voltage variations of realization of transformers with cores made out off permalloy, ferrite and amorphous steel, and it is shown that the use of a magnetic core out off amorphous steel will allow the frequency to voltage of 11.0 - 11.5 kV significantly to reduce the losses due to hysteresis and eddy currents in the magnetic core of the transformer at the frequency of voltage of 1.0 - 1.5 kHz. It is given an example of use of such a transformer when powered from single-phase autonomous voltage inverter.
Keywords: system of electric traction, ferrite, permalloy, amorphous steel, the magnetic circuit of the transformer, traction power supply, autonomous voltage inverter, the electric train, asynchronous traction motor, IGBT-module, pulsation of the magnetic flux.
Calculation of the connection power of traction substations of JSC «Russian Railways» and subways
Grechishnikov V., Shalamai I., Vlasov S., Sorokina A., Kurov N.
Calculating the power of connection of traction substations is a multidimensional and complex issue. The complexity of the definition of multiple sharply variable traction loads, sometimes contradictory requirements of SNiP, PUE, GOSTs, Recommendations and Government Decrees on the rules for access to electric power networks, the economic preferences of design and operating organizations, the safety of passengers, the probabilistic nature of emergency and abnormal operating modes of the system traction and external power supply. The article analyzes all possible approaches to determining the power of connection of traction substations, explains the fraughtness of some of them, gives recommendations on their application. Of course, full-scale analysis should include economic calculations of various options, but first, the economic consequences of accidents, like their scale, are difficult to predict and evaluate, and secondly, already the electrical engineering calculations show the failure of the race to reduce the costs of accession.
Keywords: connection power, power supply substation, consumption analysis, nutrition center.
Earthing of metal enclosures of landing platforms on еlectrified sections of alternating current
Kosarev B., Kosarev I.
The article proposes technical solutions for grounding metal fences of landing platforms on electrified AC sections. The following principles are based on the proposed system for grounding metal fences of landing platforms: creation of equipotential zones in the locations of personnel; the use of the shielding effect of metal strips, аllowing to reduce to the permissible limits the voltage induced in the metal enclosures of the landing platforms, caused by the magnetic influence of the currents in the traction network; application to reduce induced voltages natural grounders, in particular foundations of supports, which are illuminated landing platforms, video surveillance devices and other devices. A technique is proposed for calculating the magnetic and galvanic effect of traction networks on metal structures, taking into account the primary parameters of the earthing system for metal fences of the railroad landing platforms. A technique for assessing electrical safety conditions when a person touches metal fences is developed, taking into account the casual nature of touching passengers when they are on platforms.
Keywords: grounding, metal fencing of landing platforms, electrical safety, rail-earth voltages, artificial earthing switch, group grounding cable.
On the methodology for multi-factor experiment in research problems of electrical devices of railway transport
Lisenkov A., Kosarev A.
The article considers approaches to the study of electrical devices of railway transport with the use of multivariate methods for the experiment, allowing to obtain the most complete information about the dependence of performance and quality indicators from its determinants, to identify the best options for the design of such devices, providing the necessary quality of functioning in the process of operation. Proposed a new method of analysis of plans 2k in the absence of repeated measurements of the output parameters (including computational experiments based on the theoretical model of the object), and also convenient for the practical use of the plans of the second order partial factorial experiment 3k. Developed new types of orthogonal and quasi-orthogonal economical plans for solutions to common problems of experimental studies, including the robust design for manufacturing, performance and quality which is resistant (robust) to the action of destabilizing factors. As an example robust design of electrical products on the basis of the theoretical model we consider the problem of designing multifunctional power booster transformer to increase the efficiency of the traction power system of the AC – reduction of electricity losses in the traction network.
Keywords: traction power supply system, power booster transformer, approximation models, multifactor plans, economical saturated plans, plan matrix, robust design.
An investigation into the possibilities of genetic algorithm application to solve the underground electric rolling stock scheduling problem
Sidorenko V., Zhuo Ming Aung
This paper is a part of continuation publications on the topic of genetic algorithms application to the scheduling of underground rolling stock maintenance. The authors implemented the adaptive crossover selection algorithms within the genetic algorithm framework according to the features of the scheduling problem. Then the authors investigated the possibilities of genetic algorithm by using the different crossover types in solving rolling stock scheduling problem, and the influence of parameters in genetic algorithm on the results obtained. The results of genetic algorithm application are described.
Keywords: electric rolling stock, technical maintenance, genetic algorithm, optimization, scheduling.
Еstimation of the potential of wind power for use in traction power supply system of railways
Shevliugin M., Zelenskaya I., Zhumatova A.
A brief analysis of the possibility of using wind energy sources in the traction power supply system of railways is given. The results of experimental studies and statistical processing of data on long-term monitoring of wind power in the Southern region of the Republic of Kazakhstan are presented. An algorithm for the formation of a random dependence of the values of wind parameters according to predetermined distribution laws has been developed, with the aim of further modeling the operation of wind power plants in the traction substations of the railroad power supply system. The structural scheme of wind traction substations and possible modes of its operation are described. The dependences of the wind velocity distribution corresponding to the normal-logarithmic, and the duration of the gusts of the wind, corresponding to the normal distribution laws, as well as the dependence of the kinetic energy of the wind with recalculation on the electric power potential of the wind installations, are obtained. The interface of the program for estimating the performance of specific types of wind power generators under specific wind load parameters is presented.
Keywords: wind energy, wind power plants, traction substations of alternating current, traction power system of railways.
Information-diagnostic system of control of technical condition of infrastructure and rolling stock
The article examines the construction of diagnostic systems for rolling stock in conjunction with the infrastructure devices on the subways. The article is justification of application of the protocols in the diagnostics systems, with built-in protection algorithms with more functionality aimed at building the dialog exchanges between staff and system diagnostics. In the article the questions of measurement using models of TSOs and modelling diagnostics using the methods of self-organization, such as the method of group accounting of arguments. In conclusion, it is concluded that STD allows to increase technical and operational characteristics of the devices rolling stock and infrastructure to achieve higher socio-economic effect.
Keywords: diagnostics, parameter, measurement model, self-organization model, decision function.