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2008 43rd International Universities Power Engineering Conference最新文献

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The importance of IEC 61850 interoperability testing IEC 61850互操作性测试的重要性
Pub Date : 2008-12-16 DOI: 10.1109/UPEC.2008.4651594
J.C. Tan, C. Zhang, Z. Bo
This paper discusses the factors affecting interoperability between multi-vendor devices, the necessity for interoperability testing, and the types of interoperability should be conducted. It is recommended that proof-of-concept interoperability should be preformed before full scope integration, and it is crucial to adopt interoperability testing as part of site commissioning test. Interoperability testing is the next step forward after conformance test to ensure an IEC 61850 based substation automation system will interoperate as it is designed in the field. Conformance test can reduce the number of costly issues and problems during integration, site commissioning and operation. Devices passed conformance test may still subject to issues during integration, commissioning and operation. Conformance test does not mean interoperability test. Conformance testing cannot replace interoperability testing.
本文讨论了影响多厂商设备互操作性的因素、互操作性测试的必要性以及应进行的互操作性类型。建议在全面集成之前进行概念验证互操作性,并且将互操作性测试作为现场调试测试的一部分是至关重要的。互操作性测试是一致性测试之后的下一步,以确保基于IEC 61850的变电站自动化系统在现场设计时能够互操作。一致性测试可以减少在集成、现场调试和操作期间出现的昂贵问题和问题的数量。通过一致性测试的设备在集成、调试和运行过程中可能仍然存在问题。一致性测试并不意味着互操作性测试。一致性测试不能取代互操作性测试。
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引用次数: 18
Effective protection distance from cascade coordinated Surge Protective Devices to equipment in low-voltage AC power circuits 在低压交流电源电路中,级联协调浪涌保护装置到设备的有效保护距离
Pub Date : 2008-12-16 DOI: 10.1109/UPEC.2008.4651618
S. Skuletic, V. Radulovic
Protection of the equipment in low voltage AC power circuits against surges is based on wide application of surge protective devices (SPDs). Cascade application of SPDs located at the service entrance of a building and near sensitive equipment is intended to ensure optimal energy distribution among installed SPDs, as well as proper equipment protection against surges. In the paper, scenarios of surges that are impinging at the service entrance of the building of interest and application of two-stage cascade protection have been analyzed. The influence of different cables lengths: arrester - suppressor (A-S) and suppressor - load (S-L), as well as influence of type and parameters of load on SPDs protection characteristics have been analyzed and discussed. Simulation programs ATP/EMTP and MATLAB are being used for analysis of several load types, namely resistive, inductive, capacitive, resistive - inductive and resistive -capacitive load, with the parameters of real devices which can be found in low-voltage AC power circuits. Performed analysis should to point on characteristics of loads and connecting cables which provide regular protection.
对低压交流电源电路中的设备进行浪涌保护是建立在浪涌保护装置广泛应用的基础上的。将spd级联应用于建筑物服务入口和敏感设备附近,旨在确保所安装spd之间的最佳能量分配,以及适当的设备浪涌保护。本文分析了重点建筑服务入口浪涌冲击的情况及二级梯级保护的应用。分析讨论了不同电缆长度:避雷器-抑制器(A-S)和抑制器-负载(S-L),以及负载类型和参数对spd保护特性的影响。利用仿真程序ATP/EMTP和MATLAB对电阻性、感性、容性、阻性-感性和阻性-容性几种负载类型进行分析,并结合低压交流电源电路中实际器件的参数。所进行的分析应针对提供定期保护的负载和连接电缆的特性。
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引用次数: 9
Current differential protection based on Non-Conventional Instrument Transformer and IEC61850 基于非常规仪表变压器和IEC61850的电流差动保护
Pub Date : 2008-12-16 DOI: 10.1109/UPEC.2008.4651444
Kun Liu, Xinzhou Dong, Z. Bo
Non Conventional Instrument Transformer (NCIT) and IEC 61850 are crucial technologies in digital substations. But they bring some new uncertainties to protection IEDs, especially the time synchronization issue in current differential protection. The paper analyzes the time delay of transferring sampled values from NCIT to current differential relay in NCIT and IEC61850 based digital substation, then finds out the delay-non-deterministic problem, at last presents a novel current differential protection scheme by using Phase-Locked Loops (PLL ) technology.
非常规仪表变压器(NCIT)和IEC 61850是数字化变电站的关键技术。但它们给保护ied带来了新的不确定性,特别是现行差动保护中的时间同步问题。分析了NCIT和基于IEC61850的数字变电站中NCIT向电流差动继电器传送采样值的延时问题,找出了延时不确定性问题,最后提出了一种新的基于锁相环技术的电流差动保护方案。
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引用次数: 11
Simulation study of the secondary arc extinction due to single line to ground fault on the Thailand 500 kV Line from Mae Moh to Tha Ta Ko 泰国湄莫至塔塔哥500千伏线路单线接地故障二次消弧的模拟研究
Pub Date : 2008-12-16 DOI: 10.1109/UPEC.2008.4651524
K. Ngamsanroaj, S. Premrudeepreechacharn, S. Chimklai
Successful operation of a power system depends largely on the ability to provide reliable and uninterrupted service to the loads. Single phase switching has become an increasingly more viable approach to the operation of EHV systems in recent years. Indeed, single phase reclosing, if successful, represents a significant step in improving system performance and is an attractive, economical means of obtaining acceptable transient stability with fewer lines. Single phase reclosing has the additional benefits of reducing switching overvoltages. This paper describes the simulation study of secondary arc extinction due to single line to ground fault and then clearing the faulted line. The work is performed by EMTP on the Thailand 500 kV transmission line from Mae Moh to Tha Ta Ko. Various responses of simulation results are presented.
电力系统的成功运行在很大程度上取决于向负载提供可靠和不间断服务的能力。近年来,单相开关已成为一种越来越可行的超高压系统运行方式。事实上,单相重合闸如果成功,将是改善系统性能的重要一步,也是一种有吸引力的、经济的方法,可以用更少的线路获得可接受的暂态稳定性。单相重合闸具有降低开关过电压的额外好处。本文对单线接地故障后再对故障线进行清理的二次消弧模拟研究。这项工作由EMTP在泰国从Mae Moh到Tha Ta Ko的500千伏输电线路上进行。给出了仿真结果的各种响应。
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引用次数: 4
The structural stability analysis of active power filter and its capability of suppressing EMI 有源电力滤波器的结构稳定性分析及其抑制电磁干扰的能力
Pub Date : 2008-12-16 DOI: 10.1109/UPEC.2008.4651599
Zhang Lin, Luo Xibin, Liu Xianshan, Ding Kai
The nonlinear phenomenon of APF is analyzed and so does the nonlinear problem caused by the instability of the gate drive voltage of IGBT. During the research, the problem can be changed into the transmission process analysis of the instant pulse current produced from the process of IGBT on-off, the refrain of structural stability problem which caused by IGBTpsila control voltage translated into interdiction of the spreading plus of the instant electric pulse or attenuation of spreading path, after the research of switching power supply in methods of simulation and test result. It is certain that flyback switching power supply can be used in the auxiliary switch power of APF and it will be useful for the active power filter to restrain the nonlinear problem.
分析了有源滤波器的非线性现象,以及由IGBT栅极驱动电压不稳定引起的非线性问题。在研究过程中,通过对开关电源的仿真和试验结果的研究,将问题转化为对IGBT通断过程中产生的瞬时脉冲电流的传输过程分析,将IGBTpsila控制电压引起的结构稳定性问题转化为对瞬时电脉冲扩展加的阻断或扩展路径的衰减。反激式开关电源可以作为有源滤波器的辅助开关电源,对有源滤波器的非线性问题有一定的抑制作用。
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引用次数: 1
Establishment and characterization of a traceable AC voltage source at NIS, Egypt 埃及NIS可追溯交流电压源的建立和特性
Pub Date : 2008-12-16 DOI: 10.1109/UPEC.2008.4651511
H. Mageed, M. Halawa, A. Zobaa, M. Aziz
This paper describes the technical procedures for establishment and characterization of a traceable AC voltage source at National Institute for Standards (NIS), Egypt. This accurate device was established to cover ranges from 10 mV to 500 mV at frequencies up to 20 kHz. The device was entirely implemented in NIS as a part of upgrading process for the calibration capabilities of the AC functions. These capabilities include the accurate calibration of the highly precise digital multimeters and multifunction calibrators. The construction of the design as well as its characteristics is presented in this paper. A new software using Lab-View program was prepared to drive the practical setup of the measuring system. A proposed modeling of this design is also performed and subjected for electrical simulation to compare between the practical and the theoretical results. The associated expanded uncertainty of the gathering results is also reported.
本文描述了埃及国家标准研究所(NIS)建立和表征可追溯交流电压源的技术程序。这种精确的装置被建立覆盖范围从10毫伏到500毫伏,频率高达20千赫。该设备完全在NIS中实现,作为AC功能校准能力升级过程的一部分。这些功能包括高精度数字万用表和多功能校准器的精确校准。本文介绍了该设计的结构及特点。利用Lab-View程序编写了一个新的软件来驱动测量系统的实际安装。本文还对该设计进行了建模,并进行了电气仿真,以比较实际结果和理论结果。还报道了收集结果的相关扩展不确定度。
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引用次数: 4
Micro, midi or macro? Onshore wind turbine economics for Scotland 微型、中微型还是宏观?苏格兰陆上风力涡轮机的经济性
Pub Date : 2008-12-16 DOI: 10.1109/UPEC.2008.4651561
A. Makkawi, N. Gupta, T. Muneer
This article investigates the feasibility of the application of wind turbine as a means of offsetting the electricity demand for public buildings within Scotland. A number of case studies are presented with respect to currently operational micro-, midi- and macro wind turbines within England and Scotland. Presently, the micro-, midi- and macro wind turbines have been categorised as those that have their nominal output within 0-2 kW, 2-20 kW and Gt20 kW power bands. Their electrical energy generation data have been critically analysed. In particular the turbinespsila capacity factor, the annual energy output and payback period are presented. It has been found that within urban settings micro-turbines perform poorly and hence they are uneconomical. The payback period for midi-turbines located at rural, high-altitude locations with clear horizons are of much shorter order. However, the sitting of such turbines is critical. For large public sector organisations, such as universities and institutions of higher education with a high electrical energy demand and base load, large, megawatt machines provide a sustainable and economic solution. It has been shown that for one Scottish university, presently under discussion, two 1.25 MW wind turbines provide the economical option with a payback period of 7.4 years. The capacity factor for the latter machine, to be located 35 km west of university campus will be around 0.14. The machine will be able to offset 84% of the total electrical load for Napier Universitypsilas Merchiston campus.
本文调查了风力涡轮机作为抵消苏格兰公共建筑电力需求的一种手段的可行性。一些案例研究提出了关于目前运行的微型,中型和大型风力涡轮机在英格兰和苏格兰。目前,微型、中型和大型风力涡轮机被分类为标称输出在0-2千瓦、2-20千瓦和Gt20千瓦功率范围内的风力涡轮机。他们的发电数据已经被严格地分析过。重点介绍了汽轮机容量系数、年发电量和投资回收期。人们已经发现,在城市环境中,微型涡轮机表现不佳,因此它们是不经济的。位于农村、高海拔、视野清晰的地方的中型涡轮机的投资回收期要短得多。然而,这些涡轮机的位置是至关重要的。对于大型公共部门组织,如大学和高等教育机构,具有高电力能源需求和基本负荷,大型兆瓦级机器提供了可持续和经济的解决方案。目前正在讨论的一所苏格兰大学的情况表明,两台1.25兆瓦的风力涡轮机提供了经济的选择,投资回收期为7.4年。后一台机器位于大学校园以西35公里处,容量系数约为0.14。这台机器将能够抵消内皮尔大学塞拉斯·默奇斯顿校区84%的总电力负荷。
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引用次数: 0
Adaptive distance protection of double-circuit lines based on differential equation fault loop model 基于微分方程故障环模型的双回线路自适应距离保护
Pub Date : 2008-12-16 DOI: 10.1109/UPEC.2008.4651461
M. Bozek, J. Izykowski
The paper presents an adaptive procedure for digital distance protection device that allows to compensate for the negative influence of the reactance effect, caused by fault resistance and pre-fault power flow. The procedure utilizes locally measured phase currents and voltages and has been designed to operate with double-circuit power lines. The algorithm calculates on-line shift vector components that allow to change the position of relay operating characteristics. As a result, it is possible to avoid mis- or maloperation of the distance relay. Evaluation of the algorithm has been performed with use of voltage and current signals obtained from versatile simulations in ATP-EMTP.
本文提出了一种数字距离保护装置的自适应程序,可以补偿由故障电阻和故障前潮流引起的电抗效应的负面影响。该程序利用本地测量的相电流和电压,并设计用于双回路电源线。该算法计算在线位移矢量分量,允许改变继电器工作特性的位置。因此,可以避免距离继电器的误操作或误操作。利用ATP-EMTP中多功能仿真获得的电压和电流信号,对该算法进行了评估。
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引用次数: 3
A control method of charging and discharging lithium-ion battery to prolong its lifetime in power compensator for DC railway system 一种在直流铁路系统功率补偿器中延长锂离子电池使用寿命的充放电控制方法
Pub Date : 2008-12-16 DOI: 10.1109/UPEC.2008.4651677
T. Niwa, N. Nagaoka, N. Mori, A. Ametani, S. Umeda
Charging and discharging methods of lithium-ion battery installed in a power compensator for a DC railway system are developed in this paper. The power compensator has been developed to reduce its line voltage fluctuation caused by powering and braking trains. A number of charges and discharges deteriorates the lithium-ion battery and reduces the efficacy of the compensator. The proposed methods reduce the number of charges and discharges for prolonging the battery life by an insertion of a lowpass filter to the control circuit. The control method with the filter reduces the number of charging and discharging by 34%. Although the efficacy of the line voltage stabilization to rapid voltage change is decreased by the method, a parallel operation with an EDLC unit, whose capacity of 3% to that of the battery, complements the stabilization. The operations of the proposed methods are confirmed by numerical simulations using the electromagnetic transients program (EMTP) and by experiments using a scaled model.
本文研究了锂离子电池安装在直流铁路系统功率补偿器中的充放电方法。功率补偿器是为了减小动力列车和制动列车引起的线路电压波动而研制的。多次充放电会使锂离子电池劣化,并降低补偿器的效能。所提出的方法通过在控制电路中插入低通滤波器来减少充放电次数以延长电池寿命。带过滤器的控制方法使充放电次数减少34%。尽管该方法降低了线路电压稳定对快速电压变化的有效性,但与EDLC单元并联运行,其容量为电池容量的3%,可以补充稳定。通过电磁瞬变程序(EMTP)的数值模拟和按比例模型的实验验证了所提方法的有效性。
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引用次数: 11
Coal Management Module (CMM) for power plant 电厂煤炭管理模块(CMM)
Pub Date : 2008-12-16 DOI: 10.1109/UPEC.2008.4651474
A. Sinha, R. Lahiri, S. Byabortta, S. Chowdhury, S. Chowdhury, P. Crussley
Importance of coal management in power plant is very much significant and also one of the most critical areas in view of plant operation as well as cost involvement, so it forms an important part of the management process in a power plant. It deals with the management of commercial, operational and administrative functions pertaining to estimating coal requirements, selection of coal suppliers, coal quality check, transportation and coal handling, payment for coal received, consumption and calculation of coal efficiency. The results are then used for cost benefit analysis to suggest further plant improvement. At various levels, management information reports need to be extracted to communicate the required information across various levels of management. The core processes of coal management involve a huge amount of paper work and manual labour, which makes it tedious, time-consuming and prone to human errors. Moreover, the time taken at each stage as well as the transparency of the relevant information has a direct bearing on the economics and efficient operation of the power plant. Both system performance and information transparency can be enhanced by the introduction of Information Technology in managing this area. This paper reports on the design & development of Coal Management Module (CMM) Software, which aims at systematic functioning of the Core Business Processes of Coal Management of a typical coal-fired power plant.
煤炭管理在电厂中的重要性非常显著,是电厂运行和成本投入中最关键的领域之一,是电厂管理过程中的重要组成部分。它处理与估计煤炭需求、选择煤炭供应商、煤炭质量检查、运输和煤炭处理、支付收到的煤炭、消费和计算煤炭效率有关的商业、业务和行政职能的管理。然后将结果用于成本效益分析,以建议进一步改进工厂。在不同的级别上,需要提取管理信息报告,以便跨不同级别的管理交流所需的信息。煤炭管理的核心流程涉及大量的文书工作和体力劳动,这使得它繁琐、耗时且容易出现人为错误。此外,各个阶段所需的时间以及相关信息的透明度直接关系到电厂的经济性和高效运行。通过在管理这一领域中引入信息技术,可以提高系统性能和信息透明度。本文介绍了煤炭管理模块(Coal Management Module, CMM)软件的设计与开发,该软件针对某典型燃煤电厂煤炭管理核心业务流程的系统功能进行了研究。
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引用次数: 2
期刊
2008 43rd International Universities Power Engineering Conference
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