共查询到20条相似文献,搜索用时 31 毫秒
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A. V. Kotel’nikov M. V. Shevlyugin A. A. Zhumatova 《Russian Electrical Engineering》2017,88(9):586-591
The assessment of the possibility to use the potential of wind energy for power supply of the traction railway network in the context of the area of Karatau in the southern region of the Republic of Kazakhstan, the main wind-energy characteristics of the region are determined. An comparison of the program is presented with the results of statistical processing of the data sets on the long-term monitoring of the wind indicators of the investigated region with wind-speed determination during a month, mathematical expectations, law of the probability density of wind-speed distribution for a month, diagrams of wind distribution according to days within a month, instantaneous values (gusts) of wind speed for 24 h, and average wind speed by time of day for a month. A diagram of a traction power-supply system with distributed energy generation is given based on wind-power plants, their equivalent circuit and design including the wind generators, rectifying and inverting converter units, as well as the electric-energy accumulator with the direct current converter. Theoretical dependences are obtained to determined additional electric-energy losses in the traction network during redistribution of energy in the traction power-supply system from the main traction substations to energy-storage units at the “wind” traction substations during periods of an unfavorable wind situation in the region. The operation regimes of the electric-power facilities incorporated into the traction powersupply system and “wind” traction substations are described taking into account the pure traction mode from the wind electricity generator, power supply of trains from energy-storage units under conditions of the insufficient wind force, and energy-recovery regimes during braking of the trains, as well as with qualitative determination of their operating parameters. The main electrical characteristics of the equipment of the “wind” traction substations are determined. 相似文献
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Yu. A. Brodskii A. I. Podaruev V. N. Pupynin M. V. Shevlyugin 《Russian Electrical Engineering》2008,79(7):385-388
The most prospective examples of using capacitive energy storage units in the traction power-supply system are described. Functions of the units are defined. A schematic diagram and basic technical characteristics of the unit are given with reference to the metro. The preliminary technical and economic efficiency of the capacitive energy storage application for a particular line of the Moscow metro is shown. 相似文献
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A procedure for determining the efficiency of condenser energy-storage systems that are installed in underground cars for receiving electric power for traction electric cars working in a recuperative-braking regime is proposed. It was suggested to carry out comparative analysis of the efficiency of energy-storage systems on the basis of the following parameters: index of electric-power recovery in a full start-brake cycle of the wagon operation, relative determination of electric-power recovery in the braking regime and electric-power loss in the active regime of car operation, index of electric-power recovery in electrodynamic braking of traction electric cars, and relative evaluation of the mass of energy-storage systems. It is proposed to analyze the efficiency of energy-storage systems taking into account their design features. Energy-storage systems can be manufactured in a monoblock or stepped design. The proposed procedure of comparative analysis of the energy and mass-dimensional characteristics of underground cars with energy-storage systems allow their operation to be evaluated with a minimum number of source data. Installation of energy-storage systems increases the mass and energy expenditure during wagon operation, but this loss is significantly less than the energy volume recovered with an energy-storage system in a regime of recuperative braking of traction electric cars. Energy-storage systems allow one to create effective systems of autonomic recuperative braking on underground cars. A stepped design of energy-storage systems decreases their mass-dimensional characteristics and increases energy efficiency. The only real disadvantage of energy-storage systems preventing their use is their large size. 相似文献
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Ways to develop and improve traction power-supply systems and adapt them for high-speed highways are considered. One way to improve a traction power-supply system and make it more efficient is to increase the nominal voltage in the dc traction network up to 24 kV. This allows one to increase the throughput and carrying capacities of railways, increase the distance between substations, reduce the cross section of traction-network wires, and significantly reduce power losses in power-supply facilities. All this, alongside the absence of unbalanced supply voltage and inductive losses, as well as a significantly lower electromagnetic action on the infrastructure under dc conditions, results in a greater efficiency than in the case of any alternating- current traction power systems of alternating current. A mathematical model of dynamic electromagnetic processes in electrical circuits with semiconductor converters is fleshed out. Analysis and synthesis of electromagnetic processes and the main characteristics of multipulse converters, as well as a comprehensive technical and economic comparison, shows that 24-pulse rectifying circuits with a serial connection of threephase bridge are most efficient for these systems. These rectifiers provide an improvement in the quality of electrical energy not only for the primary power-supply system, but also for the traction network. They allow one to use simpler and more economical active-passive smoothing filters that provide the electromagnetic compatibility (EMC) of a new traction dc power system with the communication and railway automation facilities. In addition, the use of 24-pulse rectifiers can allow one to significantly reduce the consumption of reactive energy, reduce power losses in a traction network, and increase the efficiency of traction substations. 相似文献
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An energy storage system based on Supercapacitor (SC) for metro network regenerative braking energy is investigated. The control strategy according to the various power requirements in metro line and differing characteristics of these storage devices are proposed to manage the energy and optimize the power supply system performance. In order to estimate the required energy storage system (ESS), line 5 of Beijing metro network is modeled through a novel approach, in different running interval conditions based on the real data obtained from Beijing metro office. A useful method is proposed to predict the instantaneous regenerative energy which is delivered to each substation before applying ESS and based on that the ESS configuration for each substation is determined. A simplified mathematical model of the whole metro network has been developed and the main features of the control strategy have been developed. Numerical simulations show the efficacy of suggested control and the energy saving obtained for metro trains. 相似文献
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E. V. Bunyaeva V. G. Skorik S. V. Vlas’evskii D. S. Fokin 《Russian Electrical Engineering》2016,87(2):73-76
A method for improving the power factor of an ac locomotive with the commutator motor operating in the regenerative braking mode is proposed. The method improves the control system algorithm of the power converter. The new switching method of inverter thyristors regulates the curve of the instantaneous power during the main switching. It allows reducing the period in which the energy flow passes to the locomotive, leading an increase in the average value of the instantaneous power. A “traction substation–electric traction network–locomotive in the regenerative braking mode” mathematical model is presented to verify efficiency of the method. The model consists of several interacting electric power substations, a section of electric traction grid, a locomotive power transformer, a four-zone inverter, a control system of reversible converter, and a dc circuit. The model is realized in the OrCAD software. 相似文献
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MINORU KONDO MINORU MIYABE RYUJI EBIZUKA KOJI HANAOKA 《Electrical Engineering in Japan》2016,194(2):15-23
In commuter trains, a large portion of the energy consumption is a result of losses from traction motors. Therefore, highly efficient traction motors would be very effective for saving energy. We developed an induction motor with a high efficiency of 95.5%. This paper presents the design and an efficiency evaluation of a prototype machine. 相似文献
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In 1964, the Tokaido Shinkansen marked the start of the world's first commercial service high‐speed railway that operates at over 200 km/h. Since then, the Tokaido Shinkansen has demonstrated successful business and technological advancement. With the speeding‐up of the Shinkansen, environmental matters such as noise and vibration have become critical issues. Measures taken to counter noise and vibration—such as weight reduction and aerodynamics—also effect global environmental measures to reduce energy consumption and CO2 emission. With the introduction of the Series 300, there was a system change of applying an AC drive system, and the lightweight body realized performance improvement over the earlier Series 0. The high‐speed EMUs have readily taken advantage of technological innovation such as those achieved in electronics technology. In particular, an innovative AC drive system comprising a power converter with a GTO thyristor and asynchronous motors realized a high‐performance and lightweight traction system for high‐speed EMUs in the 1990s. Furthermore, recent innovations in electronics technology, such as low switching loss power devices and high‐power permanent magnets, have improved the AC drive systems of the high‐speed EMUs of the 21st century. This article starts out by introducing environmentally friendliness of the Shinkansen trains in terms of low energy consumption by means of traction system change, and then proceeds to describe the recent technological innovations that have given birth to lightweight traction systems, such as the Permanent Magnet Synchronous traction Motor (PMSM) and power converters with train‐draft‐cooling systems. The article concludes by summing up the environmentally friendly aspects of the Tokaido Shinkansen. Copyright © 2008 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
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D. S. Serebryakov 《Russian Electrical Engineering》2007,78(5):267-272
The processes of switching from an AC (50/60 Hz) main power-supply system to a standlby system in the presence of different initial phases and a certain delay in switching are considered under the following loads: an asynchronous motor and a power transformer. A new device and algorithm for switching without time delay and, consequently, without load voltage surges are proposed. Switching of power-supply systems using the proposed device and the influence of the switching time on the capacity of the energy-storage unit of the device are considered. The potentialities of a multifunctional device for connecting a standby power-supply system are described. 相似文献
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Electric traction systems are improved as part of the process of updating the entire system that converts the power that is consumed by the transportation process. Application of dc converters to a three-phase alternating current, the use of thyristor converters of the dc voltage level, the creation of highly efficient algorithms for computer control of electric-power conversion, and substitution of commutator dc motors for brushless three-phase ac motors lie at the core of technological improvement of electric traction systems and are now widely used in a number of industrialized countries. This paper proposes new traction power-supply systems for areas with high traffic, which require additional wires to be laid and multiconductor lines to be used. The requirements are formulated, and a methodology for grounding the electromagnetic compatibility of multiconductor lines of traction power supply and infrastructure elements is discussed. It is shown that electromagnetic coupling of lines takes place under conditions of both electric and magnetic effects between two or more electrically long lines. In electrically long lines, the voltages and currents cannot be considered independent of each other. They are interconnected through the impedance of the respective line (similarly to how electrical and magnetic fields of electromagnetic waves are linked with each other through the impedance of space). The studies and analysis that were carried out showed t6hat it is possible to simulate the propagation of electromagnetic waves along multiconductor traction power-supply lines, which allow determining not only the currents and voltages at any given point of a multiconductor line, but also simultaneously induced voltages at an adjacent line. All this allows highly accurate checking of the electromagnetic compatibility of the traction network and longitudinal power supply lines with communication lines and track circuits in areas with high traffic. 相似文献
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全并联AT供电方式下供电臂保护控制方案 总被引:1,自引:1,他引:0
首先分析了高速铁路中采用的全并联AT(autotransformer)供电方式的特点,在分析传统保护控制方案不足的基础上,提出了一种以供电臂为单元的保护控制方案.在该方案中主要讨论了AT自耦变压器保护功能的实现原理,以及供电臂发生永久性故障时供电臂自动控制方案的实现原理.以供电臂为单元的保护控制方案借助远动通道实现了牵引变电所、AT所和AT分区所之间的信息共享,提高了供电可靠性和供电自动化程度. 相似文献
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V. A. Grechishnikov 《Russian Electrical Engineering》2010,81(5):246-249
Algorithm of calculation of metro traction power-supply system was considered considering partial recuperation currents output
to traction system by modern recuperation rolling stock with asynchronous traction drive and microprocessor-based control
system. 相似文献
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蓄能用电技术的调峰特性使得其应用比较广泛,但对于蓄能用电技术的节能效果却少有量化的分析。提出、推导了电力系统能效评估的节点煤耗率指标,基于交流最优潮流进行了节点煤耗率的求解;基于节点煤耗率理论,提出了蓄能用电技术节能评价的节点用电煤耗指标,利用该指标构建并研究了蓄能用电的节能优化控制模型。IEEE14节点系统算例分析了节点煤耗率指标的时间空间特性以及用于电力系统能效评估的可行性;冰蓄冷系统算例验证了该评价方法和控制策略的可行性,蓄能用电节能优化控制可有效降低系统的整体能耗。 相似文献