Browsing by Author "Kosariev, Yevhen M."
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Item AC/DC Converter for DC Traction Power Supply System With High-Speed Train Operation(National Technical University of Ukraine "Igor Sikorsky Kiev Polytechnic Institute", Kiev, 2019) Sokol, Yevgen; Sychenko, Viktor G.; Voitovych, Yurii; Kosariev, Yevhen M.; Styslo, Bohdan; Hubskyi, Petro V.EN: Purpose of the work is improved approaches to ensure the required quality parameters of voltage in the traction network based on modern technologies and equipment. The pulsating mode of the power consumption in the railroad power supply network is the cause of the occurrence of voltage pulsations in the contact network. The use of active rectifiers in the electric power supply system of the railroad is proposed. The control system is developed by the converter, which allows to stabilize the output voltage in the DC link and also provides the unit power factor consumed by the converter and the THD consumption current at the level of 8%. A mathematical model of the converter was developed and a study of its main modes of operation was performed.Item Calculation of the Traction Power Supply Systems Using the Functions of Resistance(Instytut Kolejnictwa, Warszawa, 2015) Bosiy, Dmytro O.; Kosariev, Yevhen M.EN: The article is devoted to the development of a new method of calculating the instantaneous traction power supply circuits of the system. On the basic of the design scheme of generalized traction substations zone provided analytical functions of the resistance. Using the known functions of the current distribution of functions putted into the concept of resistance feeders traction substations. The functions of resistance and current distribution used in a more straightforward method of calculating the instant schemes that allow to formalize electrical calculations of electrical traction power supply systems.Item Calculation of the Traction Power Supply Systems Using the Functions of Resistance (preprint)(Instytut Kolejnictwa, Warszawa, 2015) Bosiy, Dmytro O.; Kosariev, Yevhen M.EN: The article is devoted to the development of a new method of calculating the instantaneous traction power supply circuits of the system. On the basic of the design scheme of generalized traction substations zone provided analytical functions of the resistance. Using the known functions of the current distribution of functions putted into the concept of resistance feeders traction substations. The functions of resistance and current distribution used in a more straightforward method of calculating the instant schemes that allow to formalize electrical calculations of electrical traction power supply systems.Item Development of an Approach to Ensure Stability of the Traction Direct Current System(PC "Technology Center", Ukrainian State University of Railway Transport, Kharkov, 2018) Sychenko, Viktor G.; Kuznetsov, Valeriy; Kosariev, Yevhen M.; Hubskyi, Petro V.; Belozyorov, Vasiliy Ye.; Zaytsev, Vadym G.; Pulin, Mykola M.EN: The result of applying the quantitative approach to the calculation of static stability of the traction power system helped us establish that when a train runs along an actual section there emerge zones with lack of stability in terms of voltage. Exact solution to the task of evaluating the stability is extremely difficult because of the need to compute the nonlinear dependences determining the modes of operation of the traction power system and electric rolling stock. In this work, we constructed a system of four autonomous nonlinear differential equations based on experimental data that simulate the behavior of current and voltage in the contact network. We also calculated stability regions for voltage regulators in the traction network, which stabilize voltage at pantographs of electric rolling stock. The obtained stability regions of voltage regulators made it possible to estimate resource of stability and to find the most robust regulators out of those constructed. The study revealed that the non-linear regulator has better robust properties than the linear one. In this case, stability of the linear regulator is very narrow ‒ Δk=0.000004, which is an order of magnitude lower than for the non-linear regulator. When applying the non-linear regulator, voltage in the contact network stabilizes 3 times faster regardless of the place of its location. Application of the devised approach would make it possible to calculate the stability regions for various schematics of the traction network in the implementation of high-speed motion and to narrow the range of voltage fluctuations. The developed dynamic model of power consumption processes, as well as the voltage regulator, could be used when constructing an intelligent, adaptive traction power system for high-speed motion.Item Energy Characteristics of the DC Distributed Power Supply Systems(University of Žilina, Slovakia, 2021) Sychenko, Viktor G.; Kuznetsov, Valeriy; Rojek, Artur; Hubskyi, Petro V.; Kosariev, Yevhen M.EN: Currently the circuit technology of the DC traction power supply system cannot provide the necessary requirements for introduction of high-speed traffic. Numbers of measures and tools have been developed to improve the traction lines that no longer meet current requirements. One of the most promising means for strengthening the traction DC lines is transition to the distributed power supply of the rolling stock. In this article, a comparative analysis was carried out of energy indicators of the classic centralized power system and distributed power systems with use of one aggregate traction substation and with use of the solar generators. That comparative analysis of these systems was performed on a simulation model with the same parameters of the traction line and rolling stock.Item Improving the Quality of Voltage in the System of Traction Power Supply of Direct Current(Polish Academy of Sciences, Committee of Transport, Warszawa, 2015) Sychenko, Viktor H.; Bosiy, Dmytro O.; Kosariev, Yevhen M.EN: Purpose of the work is improved approaches to ensure the required quality parameters of voltage in the traction network based on modern technologies and equipment in the application of power distribution system. Actuality. The introduction of high-speed traffic, increase weight standards of train necessitates increasing the carrying capacity of railways. Often the carrying capacity of existing sections electrified at 3.0 kV DC power supply unit limits. Such limitations include voltage decrease on the electric current collector below the allowable value for the normal operation of 2700 (2900 for high-speed V) and heating the contact wires, thereby losing their mechanical strength. Existing power supply system of RS, which have considerable installed traction substations, can not provide the required level of power density traction network for highspeed movement within 1.5 - 2 MW / km and, respectively, the required voltage quality. At the same time, the daily loading of a powerful traction substations in providing intensive schedule of trains does not exceed 20- 25%, while the energy loss in traction network peak load increases and reaches 10-15% of the energy consumed. Thus, the existing system of power traction networks is not sufficiently effective and economical, even with the application of existing methods to strengthen them. In our view, the main limiting factor for a given quality of voltage in the traction network is the use of centralized power. From this, the development of measures to improve the quality of voltage in the traction network in the implementation of high-speed traffic in a growing scarcity of energy resources is an urgent task. Scientific novelty. Using distributed power supply system with adjustable supply points combined into intelligent power supply, which enables adaptive change the characteristics of the transfer, conversion and consumption and optimize the mode of functioning of the traction power supply is suggested for improving the quality of voltage in the traction network in the implementation of high-speed and heavy traffic. Practical significance. Improving the quality of voltage in the traction network by using the proposed circuit design traction power supply will ensure the desired mode voltage and power characteristics of the traction network in the implementation of high-speed and heavy traffic while reducing electricity losses by 20-30%.Item Intelligent Technologies for Efficient Power Supply in Transport Systems(Silesian University of Technology, 2017) Bosyi, Dmytro O.; Sablin, Oleh I.; Khomenko, Iryna Yu.; Kosariev, Yevhen M.; Kebal, Ivan Yu.; Myamlin, Sergii S.EN: The main directions of development of the energy-saving technologies in electrified transport systems are considered in the article with taking into account the flexible regulating features of modern power equipment. The proposed theory and principles of functioning allow understanding the optimal control laws for converters, accumulators, and renewable energy sources in their integration into traction power supply systems. Research opens the possibility of the installed power of the required equipment in minimizing and reducing the capital costs for energy-saving technologies. Also, combination of all developed approaches will provide the system effect.Item Modeling of the Controlled Traction Power Supply System in the Space-Time Coordinates(Silesian University of Technology, 2017) Bosyi, Dmytro O.; Kosariev, Yevhen M.EN: The problems of the traction power supply system calculation are considered in the article. The authors proposed the space-time model, which is based on the analytical functions of the current- and voltage-drop distributions in the contact network. The usage of the proposed model is shown for the control law calculation both to stabilize the voltage at the pantographs of the electric rolling stocks and to reduce the power losses.Item A New Mathematical Model of Dynamic Processes in Direct Current Traction Power Supply System(Дніпровський національний університет ім. О. Гончара, 2019) Belozyorov, Vasiliy Ye.; Kosariev, Yevhen M.; Pulin, Mykola M.; Sychenko, Viktor G.; Zaytsev, Vadym G.EN: Abstract. A new autonomous 4D nonlinear model with two nonlinearities describing the dynamics of change of voltage and current in the contact railway electric network is offered. This model is a connection of two 2D oscillatory circuits for current and voltage in the contact electric network. In the found system for the defined values of parameters an existence of limit cycles is proved. By introduction of new variables this system can be reduced to 5D system only with one quadratic nonlinearity. The constructed model may be used for the control by voltage stability in a direct current power supply system.Item Optimization of Traction Power Supply System with Variation of Train Flow Sizes(Kaunas University of Technology, Kaunas, Lithuania, 2020) Kuznetsov, Valeriy; Hubskyi, Petro V.; Sychenko, Viktor G.; Kosariev, Yevhen M.; Papakhov, Oleksandr Yu.; Bekh, Petro V.ENG: Modern requirements for the operation of electrified railways are the efficient use of available technical means to ensure energy efficiency while increasing train traffic. The aim of the work is to substantiate the optimization of the structure of the DC traction power supply system with variation of train flows and traction loads. Such optimization should be performed after the reformatting of the train schedule and the subsequent impossibility of increasing the energy performance. The methodological basis for the optimization of the existing power supply system of the traction line is the use of a hybrid traction power supply system with an asymmetric arrangement of active generators.Item Voltage Measurement and Control System for a Distributed Traction Power Supply System(National Technical University of Ukraine "Igor Sikorsky Kiev Polytechnic Institute", Kiev, 2019) Kosariev, Yevhen M.; Sychenko, Viktor G.; Hubskyi, Petro V.; Gromova, JuliaENG: One of the problems to introduce the high-speed traffic is the need to improve the efficiency of the DC traction power supply system. The most promising method of improving this system is the transition to a distributed power supply system for traction load. During its implementation, there is a problem in measuring the voltage levels in the traction network to ensure the effective operation of the system. The article discusses the use of the sensory method for determining the voltage sensors location and checks the range of the antennas to provide redundancy of information transmission in a distributed traction power supply system.