Browsing by Author "Hubskyi, Petro V."
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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 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 Energy Efficient Distributed DC Traction Power Supply System(Kaunas University of Technology, Lithuania, 2019) Bialon, А.; Kuznetsov, Valeriy; Sychenko, Viktor H.; Hubskyi, Petro V.EN: Abstract. The classical systems of centralized power supply do not allow to provide the necessary conditions for the introduction of high-speed traffic on existing lines. Voltage values both on the buses of the traction substation and in the traction lines have a significant range of oscillations. Having a significant reserve of installed aggregate power at traction substations in Ukraine, there are no means of voltage modes regulation in the traction lines. Existing foreign and Ukrainian means for increasing of the energy efficiency of ОС traction power supply systems require significant capital investments and do not take into account the peculiarities of the organization of high-speed traffic. Therefore, it is ology of distributed power supply with the maximum use of existing infrastructure, taking into account the features of the high-speed trains load.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 Studying of the Power Modes in the Traction Line for Ensuring the High-Speed Traffic(SPC PC «Technology Center», Kharkiv, 2018) Hubskyi, Petro V.; Kuznetsov, Valeriy; Drubetskiy, Anton Ye.; Afanasov, Andriy M.; Pulin, Mykola M.EN: The object of research is the power regimes in traction power systems for both centralized and distributed power when introducing high-speed traffic. The introduction of high-speed traffic on electrified railways of Ukraine has begun a number of restrictions in the applied system of traction power supply of centralized power supply. These include not only the impossibility of providing the necessary voltage level of 2.9 kV, but also the low efficiency of the aggregate power of traction substations. In this case, the applied traction power system does not allow to provide the necessary level of specific power in the traction network. Applicable technical means and measures to strengthen the traction network do not allow, in most cases, to provide regulatory requirements for the organization of highspeed traffic. An analysis of modern research shows that overcoming these disadvantages is possible due to the application of a distributed power supply system to the traction network. To date, sufficient options have been developed for constructing such systems, but in this paper, as an alternative, a system was considered with the distribution of the aggregate power available in the system of centralized power in the inter-substation zone. At the same time it was reasonable to reduce the power of the traction substation to the level of 10 MW. During the study of power regimes in comparable traction power systems, the results of experimental studies and simulation modeling of the operating modes of the comparable systems were used. Calculations were taken into account not only the specifics of the traction load, but also its impact on the load capacity of the contact suspension. As a result of this approach, it has been shown that the distributed traction power system allows to fulfill the regulatory requirements for providing high-speed traffic. With its application, the consumption of electric energy for traction of trains is reduced by 40 %, the specific power of traction network increases by 90 %, and the load factor of traction substations – by 60 %. The proposed innovative approach to providing the necessary power mode in the traction line for the organization of high-speed traffic allows to preserve the existing infrastructure on existing electrified section of direct current. This approach allows the application of various types of electric rolling stock and provides the required capacity of the railways.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.