Explore the vast range of titles available.

The method of improving a two-section mainline diesel locomotive by using energy storage in the traction system is considered. A mathematical model was developed to study the movement of a diesel locomotive based on the recommendations and provisions of the theory of locomotive traction. For this purpose, the movement of a diesel locomotive as part of a train along a given section of a track was studied. It was determined that the use of an energy storage device on a diesel locomotive will allow up to 64% of the energy spent on train traction to accumulate. The use of energy storage in the accumulator during electrodynamic braking ensured a reduction in fuel consumption by about 50%, regardless of the options for equipping the traction system of the diesel locomotive with an energy accumulator. It is established that regardless of the options for equipping the traction system of the diesel locomotive with an energy storage device, the indicators characterizing the degree of use of the diesel engine do not change. These research results can be used in works devoted to the improvement of the control system of energy exchange between the accumulator and traction engines of diesel locomotives.

Operation modes of rolling stock at mining enterprises are considered and analyzed. The justification of the need to replace it with a modern specialized electric locomotive for quarry railway transport, equipped with an asynchronous traction electric drive and an on-board energy storage system, is presented. The determination of the parameters and structure of the on-board energy storage system, based on the condition of power compensation with limited power consumption from the traction network and ensuring the autonomous movement of the electric locomotive, is considered. This study was carried out by modeling the processes of energy exchange in the traction system of an electric locomotive. The use of lithium cells and supercapacitors in energy storage is considered. Variants of the hybridization of energy storage were studied from the standpoint of minimizing the weight, size, and cost indicators. It was established that reducing the mass of the energy storage device, which includes lithium cells and supercapacitors, leads to an increase in the cost of one kilowatt-hour of energy storage capacity, which reduces the attractiveness of capital expenditures for the creation of such an energy storage device. Hybridization of the energy storage device by combining lithium cells of different types practically does not improve its weight, size, and cost indicators. The recommended option is a storage capacity of energy based on LTO elements, for which it is necessary to select elements in order to minimize weight, size, and cost indicators.

This document describes a mathematical model of an induction motor of vehicles taking into account instantaneous magnetic losses in steel. In order to apply the simulation model in conditions of asymmetry of the supply voltage system and the motor windings, the model is made in a three-phase coordinate system using the method of taking into account the influence of the geometric parameters of the windings on the inductance of the motor. Taking into account instantaneous magnetic losses in steel is performed by introducing variable resistances into the electric circuits of the stator and rotor, which are functions of instantaneous magnetic losses in the steel of the electric motor. The simulation results showed a high convergence of the controlled parameters with the results declared by the manufacturer. This approach to the simulation of an induction motor will allow to use the proposed model in the study of electromechanical processes in the traction drive system, taking into account the peculiarities of the operating modes of electric transport.

An analysis of the operating conditions of the traction drives of an electric rolling stock with asynchronous traction motors was conducted. In the process of operation, the electric traction drive with both direct torque control and vector control was found to possibly experience unstable modes, both in terms of power supply and load. The models of electric locomotive traction drives with asynchronous electric motors with either vector or direct torque control were adapted to account for the possible presence of the aforementioned operational factors. As a result of the modeling, the starting characteristics of the electric traction drives with different control systems were obtained both in the absence and in the presence of power supply and load disturbances. The following cases were investigated for the drive with vector and direct torque control in the absence of power supply and torque disturbances: drive output at the rated speed of rotation of the electric motor shaft; 10% reduction in the rated speed; 10% increase in the rated speed. The comparison of the results obtained has demonstrated that, at lower than nominal frequencies, the electric traction drive with direct torque control has higher accuracy in its regulation of the rotational speed and torque, lower power consumption from the power supply, lower torque overshooting, but a higher level of torque pulsations than the electric traction drive with vector control. Meanwhile, at higher than nominal frequencies, the vector control has higher accuracy in its regulation of the speed, lower torque overshooting, shorter duration of transient processes, and lower torque pulsations than the direct torque control. Moreover, as a result of the investigations, the traction drive with direct torque control has been found to be more resistant to power supply and load disturbances. The results of this work are applicable to the investigation of the influence of electric traction drive control methods on the energy efficiency of the traction drive of an electric locomotive with an alternating current (AC).

Reducing transportation costs is important for increasing the competitiveness of railway transport. This is achieved by using technologies that reduce the consumption of fuel and energy resources. Such technologies include the use of hybrid power plants on rolling stock. The aim of the article is to determine the impact of the energy storage device, which is part of the hybrid power plant of a passenger diesel locomotive, on the consumption of fuel and energy resources and to assess the reduction in their cost under different options for using the energy storage device. The study was carried out by mathematical modelling of the movement of a train with a passenger diesel locomotive TEP70 on the Kharkiv‐Pasazhyrskyi‐Vorozhba section of the Ukrainian railways. The developed mathematical model combines the model of train movement along the section and the model of energy exchange processes in the traction system of a locomotive with an energy storage device. The paper considers the operation of the energy storage device in the energy storage mode during electrodynamic braking and in the plug‐in mode. It is established that the use of an energy storage device in the energy storage mode reduces fuel consumption by 3.7…18.5%. When using a plug‐in energy storage device, fuel consumption is reduced by 8…17%. It has been established that the use of a plug‐in energy storage device reduces the cost of fuel and energy resources by 23…40% compared to a serial diesel locomotive, and this allows it to be identified as a priority. The effective use of plug‐in hybrid traction systems requires a comprehensive approach to solving various problems related to technical, economic, environmental, organisational aspects and limitations of rolling stock and charging infrastructure. The article considers the use of energy storage in the modernisation of a passenger diesel locomotive. The modelling and comparison of different strategies for the use of on‐board energy storage is carried out

One of the assumptions made during the modernization process of diesel shunting locomotives is the replacement of a diesel traction motor with a DC generator with an electric asynchronous traction motor. The article aimed to develop a method of selecting energy-efficient parameters of an asynchronous electric traction motor for diesel shunting locomotives, which will ensure that its operating energy efficiency will be as high as possible. The method was verified on the example of a locomotive series ChME3 (ЧMЭ3, ČME3, ČKD S200). It has been found that using a traction asynchronous electric drive on a ChME3 locomotive, its efficiency increases in comparison with DC electric motors by 3–5% under the long-term operation modes and by 7–10% during locomotive operation with traction at the adhesion limit. Using a new traction gearbox with a higher gear ratio expands the speed range in which the asynchronous traction drive operates with a high-efficiency factor. It is effective to use a traction asynchronous electric drive to modernize ChME3 diesel locomotives in case of their use under the modes requiring the implementation of maximum traction forces at low speeds. A further increase in the efficiency of the traction asynchronous electric drive is possible based on the optimal design of the wheel-motor unit and the asynchronous traction electric drive.

In this work, the reduction of traction energy consumption with an onboard energy storage system on an electric locomotive of quarry railway transport trains has been investigated. To carry out the calculations, a mathematical model of energy processes in the traction system of the electric locomotive has been developed following modes: traction, electrodynamic braking, and maneuvering. For the determination of energy savings, the method which is based on the analysis of the tangential power dependences of the electric locomotive has been proposed. It was established, that the use of an on-board energy storage system on an electric locomotive provides a reduction of energy consumption by approximately 10% and it is practically independent of the energy storage power. The maximum power consumed from the traction network is reduced during the exploitation the onboard energy storage system. The reduction of energy consumption has been also established by about 10% if applied recuperative electrodynamic braking of the electric locomotive without on-board energy storage system. Taking into account that reduction of energy consumption from the traction network contributes to the reduction of losses in it, as well as the possibility of providing autonomous movement, the use of an on-board energy storage system becomes a priority. The practical value is a development of methods for estimating energy consumption by electric rolling stock in the case of using on-board energy storage systems and modeling the systems with energy storage systems.

The use of on-board energy storage on a locomotive for rail quarry transport is considered. Three scenarios of energy consumption in the power supply of traction electric drive and auxiliary locomotive systems using on-board energy storage system (OESS) are considered. For each of the scenarios, simplified mathematical models of processes have been developed, which describe the energy exchange in the traction and auxiliary systems during exploitation of OESS. The input data for the calculations are the dependence of the power at wheel of locomotive on time, which is determined by the results of solving the traction task for the section railway line. Calculations has been made for the studied scenarios of OESS operation using data of locomotive operation at PISC \"Poltava Ferrexpo Mining\". It is defined that the parameters of OESS depend on the energy consumption scenario. It is proposed to use OESS on the locomotive with electric traction drive based on induction motors for PISC \"Poltava Ferrexpo Mining\" according to energy consumption scenarios, which provide power from OESS during shunting and power from OESS when shunting with co-powered from the catenary for guide lifts.

The analysis of the influence of operating modes of electric rolling stock of alternating current consumption and non-deterministic non-stationary process of changing the voltage of the contact network on the energy indicators of the traction drive of the electric rolling stock was carried out. As a result of the analysis, it was found that to improve the energy efficiency of the traction drive, to optimize the energy performance of the traction drive. It is proposed to introduce an optimal control system for the sampling frequency of the control signal when implementing pulse-width modulation, on the basis of which the algorithm of operation of the power transistors of the input converter of the traction drive is organized. As an objective function in the implementation of the optimal control algorithm, it is proposed to use the power factor of the drive as a function of time. It is mathematically proven that the power factor as a function of time is a mathematical convolution of the time functions of the efficiency and the use of the active power of the traction drive. Algorithms for determining the time functions of the power factor are proposed for the case of deterministic discrete, deterministic continuous, stochastic continuous and stochastic discrete signals of the efficiency and the use of the active power of the traction drive.