scholarly journals Improving the technology of operating electric locomotives using electric power storage device

2019 ◽  
Vol 110 ◽  
pp. 01033 ◽  
Author(s):  
Kirill Domanov ◽  
Andrei Shatohin ◽  
Vladislav Nezevak ◽  
Vasily Cheremisin
Keyword(s):  
Electric Energy ◽  
Economic Assessment ◽  
Quality Parameters ◽  
Storage Device ◽  
Railway Transportation ◽  
Storage Unit ◽  
Power Circuit ◽  
Positive Effects ◽  
Transportation Process ◽  
Transportation Organization

The article discussed the questions of the railway transportation organization along the transport corridors passing through the territory of Russia using the innovative locomotives of new generation with the polygon’s structure of the transportation process’ organization. There was carried out an analysis of the railway car standing at the docking stations of the single-phase alternating and direct current. The results of simulation modeling of the transportation process on the railway sections, which have a docking station, are given. There are shown the positive effects of the perfection of the polygon’s exploitation technology of the locomotive fleet due to introduction of the double feed electric locomotives to the transport corridors, manifesting in the cargo delivery’s time reduction due to reduction of the ready train’s standing time at docking stations twice, in comparison with the time during exploitation of the only single-system electric locomotives, and also in increasing of the area’s speed of trains in the all polygon of the heavy trains’ turnover. The usage of the double feed electric locomotives in areas, which contains different kinds of the current, allows increasing the quality parameters of the traction electric rolling stock’s exploitation. There were considered the ways to increase the energy efficiency of the double feed electric locomotives, particularly by applying the electric energy storage unit for connection to the DC link of the electric locomotive’s power circuit. The economic assessment of exploitation of the two-systems electric locomotives was carried out.

scholarly journals Finding the Best Programmable PWM Pattern for Three-Level Active Front-Ends at 18-Pulse Connection

Machines ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 127
Author(s):  
Alexander S. Maklakov ◽  
Tao Jing ◽  
Andrey A. Radionov ◽  
Vadim R. Gasiyarov ◽  
Tatyana A. Lisovskaya
Keyword(s):  
Phase Shift ◽  
Power Systems ◽  
Power Quality ◽  
Electromagnetic Compatibility ◽  
Work Roll ◽  
Quality Parameters ◽  
Power Circuit ◽  
Electric Power Supply ◽  
Positive Effects ◽  
Harmonic Distortions

The existing publications on the analysis of power quality indicators in modern electric power supply systems are void of a comprehensive approach to improving these indicators in power systems by implementing multipulse connections. To the authors’ knowledge, this paper is the first to analyze current harmonic distortions in an 18-pulse connection of three-level active front-ends (AFE) featuring a programmed PWM. Raw data were obtained from, and current quality was analyzed for the power circuit of the main electric drive actuating the rolls in the rolling stand of a plate mill. The key feature of such circuitry is that the synchronous motor of each work roll is connected to the grid with an 18-pulse connection that uses three phase-shift transformers, where the phase shifts are 0° (delta/delta), 20° (delta/polygon) and −20° (delta/polygon). The circuitry connects three frequency converters (FC) with the AFEs in parallel. Phase-shift transformers were found to periodically overheat in the process. When overheating occurred, a programmed PWM voltage waveform was applied where harmonics 17 and 19 were eliminated. The goal and objectives were to analyze why the transformer would overheat and to find out how the issue could be addressed. The authors developed a simulation model of the research object in order to assess power quality parameters. Simulation results obtained in Matlab/Simulink were used to estimate the total harmonic distortions (THD) and individual harmonic factors for up to the 50th secondary transformer winding and grid harmonic with four different programmed AFE PWM voltage waveforms. The results helped find the best such waveform to prevent phase-shift transformers from overheating; one with harmonics 5, 7, 17 and 19 eliminated. The experimental and mathematical modeling results in the paper were confirmed by positive effects after industrial implementation of the system. Research performed directly on the operating equipment has been classified by the company and is not publicly available. These results are highly versatile and could be used in similar research on other circuitries to ensure the electromagnetic compatibility of nonlinear power-consuming devices.

scholarly journals Development of an effective accumulator battery with a voltage inverter in the electric energy storage unit

2021 ◽  
pp. 43-52
Author(s):  
Aleksey Udovichenko ◽  
◽  
Vadim Tokarev ◽  
Evgeny Grishanov ◽  
Sergey Kuchak ◽  
...  
Keyword(s):  
Energy Storage ◽  
Electric Energy ◽  
Low Frequency ◽  
Lithium Ion ◽  
Economic Assessment ◽  
Storage Unit ◽  
Voltage Inverter ◽  
Energy Storage Unit ◽  
Electric Energy Storage ◽  
Accumulator Battery

The article proposes a matching device between an accumulator battery and a voltage inverter in electric energy storage systems based on a reversible DC-DC converter with improved weight, size and cost indicators. Lithium-ion batteries are subject to tough operational requirements. The discharge of such batteries is not recommended to exceed their three-fold capacity (C), while the charge is limited to 0.5C, and low-frequency ripple components should not be present in the charging current. These requirements can be fulfilled with the help of the proposed matching device which is characterized by smaller dimensions and cost achieved due to the choke unit. The article proposes the calculation of the converter circuit and presents the simulation results obtained in the Psim simulation environment (the PowerSim environment). An economic assessment of the converter has been carried out.

scholarly journals Locomotive operation mode - the basis for developing the requirements for the energy storage device on railway transport

2018 ◽  
Vol 239 ◽  
pp. 01004
Author(s):  
Andrey Shatokhin ◽  
Alexandr Galkin
Keyword(s):  
Energy Storage ◽  
Direct Current ◽  
Electric Energy ◽  
Rolling Stock ◽  
Storage Device ◽  
Contact Network ◽  
Energy Storage Device ◽  
Electric Energy Storage ◽  
Operation Modes ◽  
Electric Rolling Stock

Increasing the efficiency of cargo transportation by rail is not only one of the main directions of the company JSC “Russian Railways” but also one of the main tasks of our country in order to achieve sustainable economic growth. Electric rolling stock is the largest consumer of electric energy in the company, that’s why its effective and failure-free operation is the way to solve the set tasks. The paper deals with studies related to the operation modes of a freight electric rolling stock of direct current for the purpose of determining the requirements for electric energy storage device, since it is the electric rolling stock that determines the daily schedule of electric load. The order of the analysis of experimental trips of freight electric locomotives of a direct current on the basis of cartridges of recorders of traffic parameters installed on the locomotive is determined. On the basis of the analysis of conducted trips, the main requirements for the energy storage device were obtained with a single running of electric DC rolling stock, namely the average duration of the operation modes of the electric locomotive, the maximum, minimum, and average values of voltage and current, the average value of the electric energy returned to the contact network, time of charge/discharge, and the useful energy intensity of the electric energy storage device. The studies were carried out with the support of the Russian Foundation for Basic Research for the project No 17-20-01148 ofi_m_RZD/17.

scholarly journals Analysis of the electric energy consumption components for mine train traction

2019 ◽  
Vol 294 ◽  
pp. 01001 ◽  
Author(s):  
Serhii Arpul ◽  
Viktor Artemchuk ◽  
Mykola Babyak ◽  
Viacheslav Vasilyev ◽  
Hennadii Hetman ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Energy Intensity ◽  
Electric Energy ◽  
Rolling Stock ◽  
List Type ◽  
Opencast Mining ◽  
Study Results ◽  
Transportation Process ◽  
The Cost

The paper considers the issues of reducing the energy intensity of transportation at opencast mining enterprises, the relevance of which has now increased due to the rise in the cost of fuel and energy resources. It presents the study results concerning the cost structure of the electricity consumed by electric mine transport, which form the basis for the development of technical and operational measures to reduce the energy intensity of the transportation process. It is shown that the work to reduce the electricity consumption for mined rock transportation should be aimed at: Reduction of losses in the power circuits of the traction rolling stock due to the use of more advanced electric rolling stock and regulation of the degree of utilization of the installed traction power; Introduction of new contact materials for electrical circuits with the lowest possible resistivity, including for current collector plates; Introduction of measures to reduce energy consumption for power supply of auxiliary circuits; Development and implementation of rational train control techniques. The introduction of energy-saving measures should include the development and application of effective methods for calculating individual norms of energy consumption and incentives for energy saving of the employees involved in the organization of the transportation process.

scholarly journals QUALITY OPTIMIZATION OF THE MACHINED SURFACE IN TERMS OF ELECTRIC ENERGY CONSUMPTION IN THE WEDM PROCESS

2021 ◽  
Vol 2021 (2) ◽  
pp. 4400-4407
Author(s):  
LUBOSLAV STRAKA ◽  
◽  
PATRIK KUCHTA ◽  
Keyword(s):  
Energy Consumption ◽  
Production Process ◽  
Electric Energy ◽  
Quality Parameters ◽  
Machining Process ◽  
Discharge Energy ◽  
Machined Surface ◽  
Electric Energy Consumption ◽  
Wedm Process

Current engineering production is characterized by ever-increasing requirements for the final quality of products. But high fabrication productivity is required in many cases as well. Another advantage is, of course, a beneficial economic efficiency of the production process. However, despite the advanced technical level of production and extensive knowledge in the field of electro-erosive machining, in many cases, the overall efficiency of the production process is based on the skills of operators. Besides, insufficiently experienced production operators sometimes still use the trial and error system, even today. A comprehensive set of information for selecting optimal conditions of the electric discharge machining process with the possibility of practical application in real conditions of practice is currently non-existent. The paper therefore describes the experimental measurements performed in order to optimize the quality of the machined surface with respect to electric energy consumption in the WEDM process. In contrast to current approaches, the solution of the issue relied on determining the relationship between the performance parameters of the process and its controllable output quality parameters so that they would be applicable to the conditions of real practice. It was found that with the reduction of discharge energy through individual WEDM operations, the quality indicators in terms of roughness parameters improve. However, on the other hand, reducing the discharge energy leads to a significant increase in the total electric energy consumption. Therefore, the aim of the performed optimization was to look for a suitable type of WEDM operation, in which a favourable value of the roughness of the eroded surface is achieved while maintaining favourable electric energy consumption.

scholarly journals Methodology for assessing the power of the primary source of the system of autonomous electrical supply with account of the predicted load graphics

2019 ◽  
Vol 64 (2) ◽  
pp. 205-214
Author(s):  
D. V. Karkotski ◽  
A. N. Malashin ◽  
S. A. Chumakov ◽  
Y. G. Koval
Keyword(s):  
Supply Voltage ◽  
Electric Energy ◽  
Operation Time ◽  
Primary Source ◽  
Electrical Energy ◽  
Quality Parameters ◽  
Limited Information ◽  
Autonomous Operation ◽  
Current Consumption ◽  
The Impact

When developing new or upgrading existing energy-intensive mobile objects (MO), the main way to ensure the quality parameters of the supply voltage is no worse than in the state grid, overestimation of the primary source (PS) power is 1.5–2 times relative to the maximum power of all electrical energy consumers (EEC) software.The consequence of the existing approach to determine the power of PS are: overestimation of the mass and dimensions of the autonomous power supply system (APSS) by 30–70 %, which significantly reduces speed characteristics, cross-country performance and battery autonomy of MO, as well as worsen the economics of the APSS; the workload of the PS APSS is not more than 35–55 % of the nominal capacity, which leads to a reduction in their service lives.Thus, it is impossible to take into account the peculiarities of the actual current consumption of individual EEC and the impact of their joint operation on specific PS APSS, which leads to additional financial costs and an increase in development time, as well as to the risk of failure during the testing of both the APSS and the equipment connected to it.The proposed approach for estimating the PS power of electric energy in APSS MO allows determining the full power of the EEC in terms of limited information about the EEC taking into account the nature of the load graph, as well as the magnitude and form of current consumption. As a result of analytical calculations according to the above methodology, the PS power can be reduced by 13–45 %, depending on the nature of the load, while maintaining the quality indicators of the supply voltage within acceptable limits.The considered methods for determining the power of the PS APSS will make it possible to determine the limitations for solving the problem of structural-parametric synthesis of the APSS and the algorithm for determining the power of the PS when developing a new or upgrading the existing APSS MO. This will reduce the weight and size parameters of the APSS, thereby increasing the speed characteristics, maneuverability and software permeability of MO, as well as the autonomous operation time and efficiency of the APSS operation.

scholarly journals Effectiveness of arrangement of the long cargo transportation on the fi tting platforms with different length of freight storage

2019 ◽  
Vol 78 (4) ◽  
pp. 203-209
Author(s):  
S. V. Mozgrin ◽  
G. E. Pisarevskiy
Keyword(s):  
Economic Effect ◽  
Economic Assessment ◽  
Operating Conditions ◽  
Rolling Stock ◽  
Rail Transportation ◽  
Technological Solution ◽  
Specific Data ◽  
Transportation Process ◽  
Cargo Transportation ◽  
Calculation Unit

Fitting platforms of variable freight storage lengths are used for transportation of rails and other cargo up to 25 m long. The use of innovative fixation for transportation on the fitting platforms contributes to enlargement of the range of cargo transported on such rolling stock and establishes conditions for safe transportation of such cargo.To evaluate the effectiveness of the arrangement of long cargo transportation on the fitting platform, this study examines two 25 m long rail transportation options. The transportation option involving two coupled 14.62 m platforms, when the cargo is fixed on the coupled platforms with the standard method is the basic option. The new option involves transportation of the 25 m long rails using 80-feet fitting platforms 25.62 m long at the coupling axes and multiway fi xation sets. A calendar year is assumed as the estimate period. The transported volume is assumed equal for each option, under considering the operating conditions of the calculation unit — one coupling of universal platform (or one 80-feet fitting platform), reducing the financial results to a ton of transported cargo. The value of the annual economic effect for the freight owner (Eyearown) is determined as the change of the freight owner’s expenses due to usage of the new option relative to the basic transportation option.The economic assessment of the transportation is performed considering the interests of each member of the transportation process and tested based on specific data. The results demonstrate the effectiveness of implementation of the technical and technological solution under consideration.

scholarly journals Effects of Antibiotic Diluent Additives on the Motility Parameters and Morphological Integrity of Boar Sperm During Six Days of Storage

2019 ◽  
Vol 68 (3-4) ◽  
pp. 65-70
Author(s):  
Stoja Jotanović ◽  
Borislav Peno ◽  
Siniša Mandić ◽  
Đorđe Savić ◽  
Marinko Vekić ◽  
...  
Keyword(s):  
Bacterial Contamination ◽  
Storage Period ◽  
Quality Parameters ◽  
Favourable Effect ◽  
Test Results ◽  
Positive Effects ◽  
Progressive Motility ◽  
Boar Semen ◽  
Live Sperm ◽  
Motility Parameters

Summary The purpose of this paper is to examine the effect of antibiotic diluent additives on the motility and morphological integrity of diluted fresh boar semen during a six-day storage period. A total of 60 insemination doses, originating from two Landrace boars, were examined and allocated to control (C, n=30, diluted with BTS) and experimental groups (E, n=30, diluted with BTS upon antibiotic addition). The treatment applied exerted positive effects on the preservation of progressive motility, percentage of live sperm and HOS test results (70.24 vs. 66.53%, 71.54 vs. 69.77%, 67.35 vs. 64.17% and 64.10 vs. 54.26%;91.15 vs. 90.02%, 88.38 vs. 85.55%, 81.50 vs. 76.13% and 74.53 vs. 68.72%; and 93.35 vs. 92.40%, 91.04 vs. 88.02 %, 84.67 vs. 78.15% and 77.27 vs. 69.44% HOS+ sperm for the 1st, 3rd, 5th and 6th day of storage, respectively). The results obtained indicate that the treatment applied has a favourable effect on preserving the quality parameters of diluted fresh boar semen during storage, resulting most likely from a reduction of bacterial contamination.

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