scholarly journals Power supply of trams in Poland – current state and perspectives of development

2018 ◽  
Vol 180 ◽  
pp. 03005
Author(s):  
Adam Szeląg ◽  
Tadeusz Maciołek
Keyword(s):  
Energy Efficiency ◽  
Power Supply ◽  
Autonomous Vehicles ◽  
Urban Transport ◽  
Transport Systems ◽  
Rolling Stock ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Higher Power ◽  
Supply Systems

Sustainable development of agglomerations requires efficient and ecological transport systems, i.e. electrified transport. In order to achieve the required results of operation of electrified urban transport, especially energy efficiency, it is required to closely examine the existing power supply systems. The biggest share of urban traction systems in Poland belongs to tram systems (in 15 agglomerations and cities). Recent years have witnessed an increased interest in modernisation of the existing lines and construction of new ones. Enhancement of RAMS (Reliability, Availability, Maintainability, and Safety) and energy efficiency of supply systems is a necessary requirement, due to fact that new, modern tram rolling stock with higher power poses significant challenge for the existing, in many systems, old power supply infrastructure. Furthermore, due to low driving-range of autonomous vehicles equipped with batteries and a need of frequent charging of storage devices, catenary supplied urban transport will dominate in the areas of its use. In addition, it might be helpful in developing hybrid vehicles supplied both from a catenary and from energy storage devices (charged during run under catenary) on sections without catenary. The paper presents parameters characterizing tram power supply systems in Poland. The analyses carried out for many tram lines have shown that even at relatively low investments for modernisation of the tram power supply system, it is possible to obtain fast return (energy saving due to improvement of efficiency of recuperation and the resulting reduction of CO2 emission). Other advantages of modernisations include: enhancement of standards in supply of modern trams with higher power and improvement of reliability due to the reduced risk of disturbances and damages.

scholarly journals CALCULATION OF OPTIMAL PARAMETERS FOR STORAGE AND RENEWABLE ENERGY SOURCES IN ISOLATED ENERGY SYSTEMS

2021 ◽  
pp. 91-95
Author(s):  
Mykhailo Syvenko ◽  
Oleksandr Miroshnyk
Keyword(s):  
Renewable Energy ◽  
Energy Storage ◽  
Power Supply ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Electric Energy ◽  
Energy Sources ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Supply Systems

A detailed substantiation of the use of electric energy storage devices in the presence of generators on renewable energy sources in the power supply system is given. The dependence of the storage parameters on the composition and priority of generation in the system is investigated. The solution of the problem of determining the parameters of electricity storage devices by means of purposeful simulation of generation parameters is considered. The results of the choice of power and capacity of the energy storage using technical and economic indicators are shown. Optimal parameters of electric energy storage devices as one of the most important means of ensuring the activity of isolated power supply systems together with selection of generating devices are determined. The results of calculations of capacity of renewable energy sources in isolated power supply systems in combination with classical energy sources are given. The necessity of using the principle of activity of the distribution electric network and the possibility of its realization is demonstrated. The optimal storage capacity as a function of the share of renewable generation, the non-integrated energy produced by renewable sources and the total storage capacity are plotted for several isolated systems. The main points of the used model of the power supply system of isolated networks are given. In the studied isolated power supply systems, wind power plants and solar power plants, which have significant unpredictability of generation, are used as generation based on renewable energy sources. The problem of undersupply of electricity to the grid by stepwise increase of generation is analysed. The results of the multi-step selection of power and energy consumption of electricity storage are determined by technical criteria.

Efficiency of energy storage devices as a backup power sources

2020 ◽  
Vol 6 ◽  
pp. 24-29
Author(s):  
Vyacheslav Shleynikov
Keyword(s):  
Cost Effectiveness ◽  
Energy Storage ◽  
Power Supply ◽  
Environmental Benefits ◽  
Energy Storage Devices ◽  
Power Sources ◽  
Storage Devices ◽  
Storage Technology ◽  
Energy Storage Technology ◽  
Supply Systems

Energy storage technology offers a number of economic and environmental benefits. This paper provides an analysis of power grid backing up solutions with energy storage devices assuming that energy storage backing up can be generally more efficient for microgrids than conventional reserving options. Cost-effectiveness and a distance to a backup source have been accepted as criteria for comparing. For power supply systems of 200 AH, the energy storage backup efficiency has been proven by appropriate computations as reflected in this paper.

scholarly journals On-Board and Wayside Energy Storage Devices Applications in Urban Transport Systems—Case Study Analysis for Power Applications

Energies ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 2013 ◽  
Author(s):  
Petru Valentin Radu ◽  
Miroslaw Lewandowski ◽  
Adam Szelag
Keyword(s):  
Energy Storage ◽  
Control Method ◽  
Urban Transport ◽  
Transport Systems ◽  
Light Rail ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Case Study Analysis ◽  
Traction Power Supply ◽  
Free Section

This paper investigates the benefits of using the on-board energy storage devices (OESD) and wayside energy storage devices (WESD) in light rail transportation (metro and tram) systems. The analysed benefits are the use of OESD and WESD as a source of supply in an emergency metro scenario to safely evacuate the passengers blocked in a metro train between stations; the use of OESD for catenary free sections, the benefits of using the WESD as an energy source for electrical car charging points and tram traction power supply; the benefits of using a central communication system between trams, cars, WESD and electrical car charging points. The authors investigated the use of: OESD with batteries for a catenary free section for different scenarios (full route or a catenary free section between two stations); the charge of OESD between stations (in parallel with tram motoring) to decrease the charging dwell time at stations and to help in achieving the operational timetable; the thermal effect of the additional load on the overhead contact system (OCS) when the tram is charging between stations; the sizing of OESD and WESD for emergency feeding in a metro system. The authors investigated the use of the WESD as a source of energy for the electrical car charging points to reduce the car pollution and carbon emissions. Presented in the paper is the enhanced multi train simulator with WESD prepared for the analyses conducted. The paper describes the DC electrical solver and WESD control method. A validation of the software has been conducted in regard to the substation voltage, WESD energy balance and WESD control.

scholarly journals Selection of electricity storage devices for mobile DC traction substations

2021 ◽  
Vol 2131 (4) ◽  
pp. 042082
Author(s):  
O A Stepanskaya ◽  
N D D’yachkova ◽  
A B Batrashov
Keyword(s):  
Energy Storage ◽  
Power Supply ◽  
Power Plants ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Advantages And Disadvantages ◽  
Traction Substations ◽  
Traction Power Supply ◽  
Supply Systems ◽  
Traction Power

Abstract The aim of the study is to review the sources covering the problems of accumulating electricity on the railways and to find new solutions to reduce the use of electricity in traction power supply system. The article analyses some existing types of electric energy storage devices (capacitive, inertial, superconducting inductive, electrochemical, fuel cells and pumped storage power plants), their common installation locations, advantages, and disadvantages. The possibility of using them in railway traction power supply systems, in particular in mobile traction substations, is also assessed. In addition, the article lists the parameters on the basis of which the optimum type of storage device can be selected for the given conditions. The study concludes that the use of some types of energy storage devices in mobile traction substations is acceptable when regenerative braking can be used at the site, and this method of energy saving can be recommended in the engineering of new or reconstruction of existing traction substations. It has been found that capacitive and inertial (flywheel) electrical energy storage units are the most suitable in terms of parameters for installation of traction power supply systems.

Study of power transformer loading in rural power supply systems

2021 ◽  
Vol 13 (4) ◽  
pp. 282-289
Author(s):  
I. V. Naumov ◽  
D. N. Karamov ◽  
A. N. Tretyakov ◽  
M. A. Yakupova ◽  
E. S. Fedorinovа
Keyword(s):  
Energy Efficiency ◽  
Power Supply ◽  
Rural Areas ◽  
Power Transformer ◽  
Electric Energy ◽  
Power Transformers ◽  
Electric Networks ◽  
Load Factors ◽  
Optimal Load ◽  
Supply Systems

The purpose of this study is to study the effect of loading power transformers (PT) in their continuous use on their energy efficiency on a real-life example of existing rural electric networks. It is noted that the vast majority of PT in rural areas have a very low load factor, which leads to an increase in specific losses of electric energy when this is transmitted to various consumers. It is planned to optimize the existing synchronized power supply systems in rural areas by creating new power supply projects in such a way as to integrate existing power sources and ensure the most efficient loading of power transformers for the subsequent transfer of these systems to isolated ones that receive power from distributed generation facilities. As an example, we use data from an electric grid company on loading power transformers in one of the districts of the Irkutsk region. Issues related to the determination of electric energy losses in rural PT at different numerical values of their load factors are considered. A computing device was developed using modern programming tools in the MATLAB system, which has been used to calculate and plot the dependence of power losses in transformers of various capacities on the actual and recommended load factors, as well as the dependence of specific losses during the transit of 1 kVA of power through a power transformer at the actual, recommended and optimal load factors. The analysis of specific losses of electric energy at the actual, recommended and optimal load factors of PT is made. Based on the analysis, the intervals of optimal load factors for different rated power of PT of rural distribution electric networks are proposed. It is noted that to increase the energy efficiency of PT, it is necessary to reduce idling losses by increasing the load of these transformers, which can be achieved by reducing the number of transformers while changing the configuration of 0.38 kV distribution networks.

REPORTS OF THE TSHA ISSUE 293 (PART 3)

2021 ◽  
Author(s):  
L. V. Verzunova ◽  
Keyword(s):  
Power Supply ◽  
Energy Supply ◽  
Crop Production ◽  
New Technologies ◽  
Service System ◽  
Transport Systems ◽  
Scientific Conference ◽  
Industrial Complex ◽  
Applied Mechanics ◽  
Supply Systems

The collection includes articles based on the reports of scientists of the K. A. Timiryazev RGAU-MSHA, other universities and research institutions at the International Scientific Conference dedicated to the 155th anniversary of the K. A. Timiryazev RGAU-MSHA, which was held on December 2-4, 2020. The materials are presented on topical issues: the use of new technologies and equipment in power supply systems of enterprises; innovations in heat engineering, hydraulics and energy supply of enterprises and in transport and technological machines and complexes; automotive equipment, improving the efficiency of the use of technological and transport systems; innovative technologies in crop production;applied mechanics; innovative directions for the development of the technical service system in the agro-industrial complex; quality management and metrological support in the production and technological systems of the agro-industrial complex.

Reducing weight of the power supply systems for rolling stock by using resonance DC-DC converter

ICCAS 2010 ◽  
2010 ◽  
Author(s):  
Jeong-Min Jo ◽  
Young-Jae Han ◽  
Chang-Young Lee ◽  
Hyun-Seung Jeong ◽  
In-Duk Park
Keyword(s):  
Power Supply ◽  
Rolling Stock ◽  
Supply Systems

SIMULATION OF DESIGN COMPONENTS OF POWER SUPPLY SYSTEMS FOR PERSONAL COMPUTERS

2021 ◽  
pp. 8-13
Author(s):  
А.Н. Юров ◽  
Д.В. Цымбал
Keyword(s):  
Personal Computer ◽  
Power Supply ◽  
Pulsed Power ◽  
Power Supply Unit ◽  
Information Storage ◽  
Stable Operation ◽  
Assembly Model ◽  
Storage Devices ◽  
Linear Programming Methods ◽  
Supply Systems

Предложена разработка цифрового макета изделия, который представляет собой компонент ЭВМ - импульсный блок питания. Производится анализ предполагаемых компонентов персонального компьютера, которые будут установлены в систему. При необходимости есть возможность выбора с добавлением новых компонентов в системный блок ЭВМ. После определения заданных компонентов ПК производится расчет мощности, которая нужна для получения стабильной работы системы в целом. По произведенным расчетам выполняется 3D-моделирование блока питания с разъемами для подключения материнской платы, видеокарты, а также прочих устройств, в том числе и накопителей информации. В работе исследованы вопросы по применению методов линейного программирования для решения поставленных задач в соответствии с исходными данными, а также подходы по получению 3D-модели источника питания с построенными трассами до разъемов подключения устройств и компонентов персонального компьютера. Кроме того, подготовлено программное обеспечение, в котором визуально представлен процесс построения сборочной модели БП согласно произведенным расчетам We propose the development of a digital model of the product, which is a computer component - a pulsed power supply. We carried out the analysis of the expected components of the personal computer that will be installed in the system. If necessary, there is a choice with the addition of new components to the system unit of the computer. After determining the specified PC components, the power is calculated, which is needed to obtain stable operation of the system as a whole. According to the calculations made, 3D-modeling of the power supply unit with connectors for connecting the motherboard, video card, as well as other devices, including information storage devices, is performed. The paper investigates the issues of using linear programming methods for solving the assigned tasks in accordance with the initial data, as well as approaches to obtaining a 3D model of a power supply with constructed routes to the connectors for connecting devices and components of a personal computer. In addition, we prepared the software, in which the process of building an assembly model of a power supply unit is visually presented according to the calculations

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