Загальноуніверситетські колекції

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Energy Efficiency Determination of Loading-Back System of Electric Traction Machines
(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2014) Afanasov, Andriy M.; Drubetskiy, Anton Ye.; Arpul, Serhii V.; Khvorostyankina, А. P.
EN: Purpose. Acceptance post-repair tests of electric traction machines are conducted on loading-back stands that reduce the overall power costs for the tests. Currently a number of possible circuit designs of loading-back systems of electric machines are known, but there is no method of determining their energy efficiency. This in turn makes difficult the choice of rational options. The purpose of the article is the development of the corresponding methodology to make easier this process. Methodology. Expressions for determining the energy efficiency of a stand for testing of electric traction machines were obtained using the generalized scheme analysis of energy transformations in the loading-back systems of universal structure. Findings. The technique was offered and the analytical expressions for determining the energy efficiency of loading-back systems of electric traction machines were obtained. Energy efficiency coefficient of loading-back system is proposed to consider as the ratio of the total action energy of the mechanical and electromotive forces, providing anchors rotation and flow of currents in electric machines, which are being tested, to the total energy, consumed during the test from the external network. Originality. The concept was introduced and the analytical determination method of the energy efficiency of loading-back system in electric traction machines was offered. It differs by efficiency availability of power sources and converters, as well as energy efficiency factors of indirect methods of loss compensation. Practical value. The proposed technique of energy efficiency estimation of a loading-back system can be used in solving the problem of rational options choice of schematics stands decisions for electric traction machines acceptance tests of main line and industrial transport.
Energy-Efficient and Cost-Effective Methods of Driving Trains under the Conditions of Development of the Electricity Market
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Pshynko, Alexander N.; Afanasov, Andriy M.; Kuznetsov, Valeriy; Skalozub, Vladyslav V.; Arpul, Serhii V.; Ivanov, Alexander P.
ENG: Abstract. The article for the first time considers the possibilities for the organization of cost-effective rail transportation on electrified section in terms of the functioning of the Ukrainian balancing electricity market. It is formulated the complex task of choosing effective mechanisms of purchase and sale on the electricity market on the basis of contracts for the implementation of markets "for the day ahead", as well as for the appointment of parameters and tariffs of the intraday market. The authors presented the models and results of calculations of optimum modes of trains’ driving, which are calculated for various criteria of efficiency taking into account the cost of the consumed active and reactive electric energy. The technique of tariff formation for purchase of electricity on the balancing market was proposed.
Regulation of Unbalanced Electromagnetic Moment in Mutual Loading Systems of Electric Machines of Traction Rolling Stock and Multiple Unit of Mainline and Industrial Transport
(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2014) Afanasov, Andriy M.
EN: Purpose. The research data are aimed to identify the regulatory principles of unbalanced electromagnetic moment of mutually loaded electric machines of traction rolling stock and multiple unit of main and industrial transport. The purpose of this study is energy efficiency increase of the testing of traction electric machines of direct and pulse current using the improvement methods of their mutual loading, including the principles of automatic regulation of mutual loading system. Methodology. The general theoretical provisions and principles of system approach to the theoretical electric engineering, the theory of electric machines and theoretical mechanics are the methodological basis of this research. The known methods of analysis of electromagnetic and electromechanical processes in electrical machines of direct and pulse current are used in the study. Methods analysis of loading modes regulation of traction electric machines was conducted using the generalized scheme of mutual loading. It is universal for all known methods to cover the losses of idling using the electric power. Findings. The general management principles of mutual loading modes of the traction electric machines of direct and pulse current by regulating their unbalanced electric magnetic moment were developed. Regulatory options of unbalanced electromagnetic moment are examined by changing the difference of the magnetic fluxes of mutually loaded electric machines, the current difference of electric machines anchors, the difference of the angular velocities of electric machines shafts. Originality. It was obtained the scientific basis development to improve the energy efficiency test methods of traction electric machines of direct and pulse current. The management principles of mutual loading modes of traction electric machines were formulated. For the first time it is introduced the concept and developed the principles of regulation of unbalanced electromagnetic moment in the mutual loading systems of electric machines of direct and pulse current. Analytical expressions for the unbalanced moment of mutually loaded electromagnetic electric machines were obtained. The requirements for automatic regulation systems of the mutual loading stands of the traction electric machines of direct and pulse current are formulated. Practical value. Using the results of the theoretical research will significantly simplify the development algorithms of the test stands management of the traction electric machines of rolling stock for mainline and industrial transport. Introduction of the proposed principles of mutual loading for traction electric machines will significantly reduce the costs for creating new stations and modernization of the existing ones for testing of traction electric machines. Automating the process of refit and acceptance tests of traction electric machines will significantly improve the test quality and reliability of the traction rolling stock and multiple unit with electric traction drive.
Systems Mutual Loadings of Traction Asynchronous Cars
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Afanasov, Andriy M.; Shapovalov, Oleksandr S.; Voitenko, Maryna V.
EN: Abstract. The review of methods of post-repair tests of traction asynchronous motors under conditions of locomotive depot is carried out.The necessity of introducing special stands for post-repair tests is shown in order to improve their quality, reduce the number of failures of service equipment, improve safety of the railway transport. Let's consider a question of power supply of the research asynchronous engine in wide frequency range and also a possibility of creation of the universal stand for testing important asynchronous engines of the electrorolling stock. Survey of possible versions of the scheme mutual loadings of asynchronous electrical machines which can be used for testing traction asynchronous engines of the rolling stock is executed. Such systems can be constructed both with use of the static converter of frequency, and without it. The given short characteristic of each alternative, certain advantages and shortcomings of each of system options. It is shown that systems with use of static converters of frequency differ in high power efficiency, allow to carry out tests in the wide frequency range of power supply, however have higher prime cost. Schemes without converters of frequency differ in smaller power efficiency, impossibility to carry out tests in the wide range of frequency of power supply, high level of consumption of reactive power . The results of the carried-out analysis can be used when choosing rational option of a system mutual loadings of asynchronous electric motors which will differ in higher functionality and power efficiency. Use of such systems will allow to lower capital expenditure for creation new and modernization of traction electrical machines that exist at the station for test.