Browsing by Author "Nikitenko, Anatolii V."
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Item Electrodynamics of Power Losses in the Devices of Inter-Substation Zones of AC Electric Traction Systems(MDPI, Basel, Switzerland, 2022) Nikitenko, Anatolii V.; Kostin, Mykola O.; Mishchenko, Tatyana M.; Hoholyuk, OksanaENG: This article presents a new method for the estimation of active power losses based on a “field” approach, i.e., on the theory of the electromagnetic field and the theory of propagation of electromagnetic waves in a dielectric medium. Electromagnetic waves are assumed to transmit energy from the traction substation to electric rolling stock through the airspace of the inter-substation zone (i.e., not through the wires of the traction network) and meet electrically conductive surfaces on their way. The waves are partially reflected from the surfaces and partially penetrate them, thus creating thermal losses, the determination of which is the main task of this article. The analytical expressions for specific losses of active power are obtained by solving the system of Maxwell’s equations. Calculations of specific power losses in the catenary, rails, roofs, and bottoms of carriages and electric locomotives are performed. Power losses in carriages and electric locomotives are found to be at least 7%. A comparative assessment of the magnitude of total power losses of different types obtained by the “field” and “circuit” approaches is provided, which has established that “conditional” losses correspond to losses in rails, train carriages, and electric locomotives.Item Electrodynamics of Reactive Power in the Space of Inter-Substation Zones of AC Electrified Railway Line(MDPI, 2021) Kostin, Mykola O.; Nikitenko, Anatolii V.; Mishchenko, Tatyana M.; Shumikhina, LyudmilaENG: In railway traction, the definition of “electromagnetic field” is functionally connected to the concept of the reactive power consumed by the electric rolling stock, and characterized by the running and standing electromagnetic waves in the space of the inter-substation zones from the site of the AC traction system. Such a definition is established and theoretically justified by the theory of electromagnetic fields. This article uses the methodology of this theory, in particular, a method for power balance estimation in electromagnetic fields based on Maxwell’s equations, as well as methods for the analysis of running and standing electromagnetic waves based on the theory of reflection, propagation and transmission of plane harmonic waves. The research considers the regularities of standing electromagnetic waves in the space of inter-substation zones of electric traction systems, which occur due to the incomplete reflection of incident waves from the contact wire and metal parts of the roof surface and the frontal part of the body of the electric rolling stock. The flow of electricity to the roof surface and the frontal part of the body of an electric locomotive is considered. The possibility of using existing methods to reduce wave reflections and thereby to effectively compensate for reactive power in the space of inter-substation zones is discussed.Item Energy of Starting up to Speed of Dc Train(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2015) Kostin, Mykola O.; Nikitenko, Anatolii V.ENG: In the last 20 ... 25 years the volume of recuperated electric energy is less than 2% of the consumed by traction, while it is possible to return about 10 ... 15%. The main reason is unsatisfactory and inefficient usage of recuperated and transmitted energy to the power supply system. The paper proposes to solve this problem and induce the efficiency and the degree of recuperated energy of DC multiple unit trains by the usage of onboard supercapacitive storage system. The methods of the electric traction theory and the theory of pulse electrical engineering are used for the problem solving. The developed methodology allows to calculate the energy, which is required to starting up the multiple unit train EPL2T to some speed 10 ... 80 km/h after its stopping.Furthermore, the capacity of the on-board storage is calculated in two cases of storing recuperated energy. The novelty of the paper is the new method for estimating energy, which is required to starting up (after the stopping) the train to a certain speed. The analytical expression of the capacity of the on-board storage system was achieved and calculated for the previously estimated energy. For the first time it was found that the energy, which was saved by the on-board supercapacitive storage system, is sufficient to start up the train to some speed and reach the characteristic of full field of the traction motors. The proposed autonomous mode of recuperative braking allows, at first, to increase significantly the efficiency of energy recovery, and secondly, to reduce the weight and size parameters of on-board storage supercapacitors.Item Losses of Recovered Electric Energy in the Elements of a DC Electric Transport System(IEEE, 2016) Szelag, Adam; Kostin, Mykola O.; Nikitenko, Anatolii V.ENG: The regenerative braking is one of the most attractive ways for energy saving in electric transport. It has many advantages and its effectiveness is discussed in numerous researches, but there are no significant publications, which describe the power losses in the way of recovered current flowing. The paper describes an alternative method for estimating recovered energy losses in the elements of a DC electric transport system. In comparison with existing methods, it is based on the correlation theory of stochastic processes and takes into account the Fryze’s concept for reactive power. The method is verified by the experimental researches, which are performed for the VL8, VL11M, VL11M6 locomotives, EPL2T multiple-unit train and T4D tram, which operate in DC sections, Ukraine. The losses are calculated for different elements of an electric transport system, and their theoretical and statistical distributions with basic probabilistic characteristics are shown. The results prove the validity and applicability of the method.Item Methods of Spectral Analysis of Traction Voltages and Currents as Random Functions(IEEE, Lviv, 2015) Nikitenko, Anatolii V.EN: The paper shows the methods of spectral analysis of stochastic traction voltages and currents. The results of analysis are shown for the voltage, which was recorded in the process of real operation of EPL2T electric multiple-unit train.Item Technical Losses of the Recovered Electric Energy in DC Traction Power Supply System(Національний університет "Львівська політехніка", 2013) Nikitenko, Anatolii V.EN: The efficiency of the recuperative braking of DC electric rolling stock is analyzed in the article. The monitoring of voltages and currents was done for the trains EPL2T and locomotives VL8 in the traction and the recuperative braking modes. The basic, additional and the total technical losses of the recuperated energy were calculated for DC traction power system. The statistical and theoretical distributions of the RMS current, the additional and total losses were drawn and the basic probabilistic coefficients were calculated for them.Item Technical Losses of the Recovered Electric Energy in DC Traction Power Supply System (preprint)(Національний університет "Львівська політехніка", 2013) Nikitenko, Anatolii V.EN: The efficiency of the recuperative braking of DC electric rolling stock is analyzed in the article. The monitoring of voltages and currents was done for the trains EPL2T and locomotives VL8 in the traction and the recuperative braking modes. The basic, additional and the total technical losses of the recuperated energy were calculated for DC traction power system. The statistical and theoretical distributions of the RMS current, the additional and total losses were drawn and the basic probabilistic coefficients were calculated for them.