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2014 49th International Universities Power Engineering Conference (UPEC)最新文献

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Analysis of voltage support by electric vehicles and photovoltaic in a real Danish low voltage network 丹麦实际低压电网中电动汽车和光伏的电压支撑分析
Pub Date : 2014-10-23 DOI: 10.1109/UPEC.2014.6934759
K. Knezović, M. Marinelli, R. Møller, P. B. Andersen, C. Traholt, F. Sossan
With conventional generating units being replaced by renewable sources which are not required to provide same high level of ancillary services, there is an increasing need for additional resources to achieve certain standards regarding frequency and voltage. This paper investigates the potential of incorporating electric vehicles (EVs) in a low voltage distribution network with high penetration of photovoltaic installations (PVs), and focuses on analysing potential voltage support functions from EVs and PVs. In addition, the paper evaluates the benefits that reactive power control may provide with addressing the issues regarding voltage control at the expense of increased loading. Analysed real Danish low voltage network has been modelled in Matlab SimPowerSystems and is based on consumption and PV production data measured individually for number of households.
随着传统发电机组被不需要提供同样高水平辅助服务的可再生能源所取代,越来越需要额外的资源来达到有关频率和电压的某些标准。本文研究了将电动汽车(ev)纳入光伏装置(pv)高渗透率的低压配电网的潜力,并重点分析了电动汽车和pv的潜在电压支持功能。此外,本文还评估了无功功率控制在解决以增加负荷为代价的电压控制问题时可能提供的好处。在Matlab SimPowerSystems中对丹麦实际低压电网进行了建模分析,并基于家庭数量的消费和光伏生产数据进行了单独测量。
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引用次数: 40
Multicarrier wave dual reference very low frequency PWM control of a nine levels NPC multi-string three phase inverter topology for photovoltaic system connected to a medium electric grid 并网光伏系统九电平NPC多串三相逆变器拓扑结构的多载波双参考极低频PWM控制
Pub Date : 2014-10-23 DOI: 10.1109/UPEC.2014.6934666
R. Mechouma, H. Aboub, B. Azoui
The multilevel multi-string inverter has gained much attention in recent years due to its advantages in lower switching loss, better electromagnetic compatibility, higher voltage capability, and lower harmonics. Solar Energy is one of the favorable renewable energy resources and the multilevel inverter has been proven to be one of the important enabling technologies in photovoltaic (PV) utilization. This paper proposes a three phase nine levels NPC grid connected photovoltaic inverter topology with a multicarrier dual reference pulse-width modulated (PWM) control scheme. Eight carrier waves of the same frequency and different amplitudes are compared with two references (a sine wave and its opposite) for generating the control signals of the switches. Some DC/DC boost converters are used to amplify the voltage produced by the photovoltaic generators. Each of these converters is controlled by an MPPT algorithm in order to track the maximum power point of the GPV. Results of simulation in Matlab environment are given and discussed.
近年来,多电平多串逆变器因其具有开关损耗小、电磁兼容好、抗压能力强、谐波低等优点而受到广泛关注。太阳能是一种有利的可再生能源,多电平逆变器已被证明是光伏利用的重要使能技术之一。本文提出了一种采用多载波双参考脉宽调制(PWM)控制方案的三相九电平NPC并网光伏逆变器拓扑结构。8个相同频率和不同幅值的载波与两个参考(正弦波和正弦波的相反)进行比较,以产生开关的控制信号。一些DC/DC升压变换器用于放大光伏发电机产生的电压。为了跟踪GPV的最大功率点,每个转换器都由MPPT算法控制。给出了在Matlab环境下的仿真结果并进行了讨论。
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引用次数: 13
Medium-voltage cable inductive coupling to metallic pipelines: A comprehensive study 中压电缆与金属管道电感耦合的综合研究
Pub Date : 2014-10-23 DOI: 10.1109/UPEC.2014.6934713
T. Papadopoulos, Georgios C. Christoforidis, D. Micu, L. Czumbil
In this work a comprehensive study of the electromagnetic interference problem on a metallic pipeline exposed to medium voltage underground cable systems is presented. Simulations are carried out using the well-known software package ATP-EMTP and results of the induced voltages on the metallic pipeline are presented for several operating conditions and configurations. Results show that the induced voltages significantly depend on the cable configuration, whereas high and hazardous voltage levels may be arise as the asymmetry in the cable flowing currents increases with the worst case being the single-phase to ground fault.
本文对中压地下电缆系统中金属管道的电磁干扰问题进行了全面的研究。利用著名的ATP-EMTP软件包进行了仿真,给出了几种工况和配置下金属管道上的感应电压结果。结果表明,电缆结构对感应电压的影响很大,而随着电缆电流不对称性的增加,最坏的情况是单相接地故障,可能会产生高电压和危险电压水平。
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引用次数: 7
Vehicle-to-building control approach for EV charging 电动汽车充电的车到楼控制方法
Pub Date : 2014-10-23 DOI: 10.1109/UPEC.2014.6934639
C. Marmaras, M. Corsaro, E. Xydas, L. Cipcigan, M. Pastorelli
The growth of vehicle electrification will make the electric power systems to face new challenges as the load profile changes. Charging the EVs will increase the electricity demand and may cause new peaks. However, the nature of this new type of load offers flexibility that can be used to achieve a variety of goals, including a reduction of the charging impact or cost. The objective of this paper is to present a control algorithm that can be utilized by a commercial building manager for scheduling and managing the EV charging demand. The control algorithm uses Vehicle-to-Building (V2B) interactions to either reduce the building's peak demand, or reduce the daily electricity cost for the building manager. Based on real data from the National Travel Survey of 2010, a realistic EV fleet is assumed, and the effectiveness of the algorithm is examined for different charging/discharging rates and V2B levels.
随着汽车电气化的发展,电力系统将面临负荷变化带来的新挑战。为电动汽车充电将增加电力需求,并可能造成新的高峰。然而,这种新型负载的性质提供了灵活性,可用于实现各种目标,包括减少充电影响或成本。本文的目的是提出一种控制算法,可用于商业建筑管理者对电动汽车充电需求的调度和管理。控制算法使用车辆到建筑物(V2B)的交互来减少建筑物的高峰需求,或降低建筑物管理员的日常电力成本。基于2010年全国出行调查的真实数据,假设一个真实的电动汽车车队,并在不同的充放电率和V2B水平下检验算法的有效性。
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引用次数: 8
Long-term voltage collapse analysis on a reduced order nordic system model 降阶北欧系统模型的长期电压崩溃分析
Pub Date : 2014-10-23 DOI: 10.1109/UPEC.2014.6934733
M. R. S. Tirtashi, O. Samuelsson, J. Svensson
This paper analyzes and explains the mechanism behind long-term voltage collapse in the NORDIC32 test system. For this purpose a simplified test system called N5area, reflecting the key voltage collapse characteristics of NORDIC32 is proposed. Applying control algorithms is much easier in N5area than in NORDIC32. Load recovery and generator excitation current limiter actions which are two important factors contributing to long-term voltage collapse are considered. Dynamic simulation results for a specified long-term voltage instability scenario are explained and discussed. The effect of generator current limiters is analyzed using PV curves. Furthermore, two different control strategies for controlling the shunt capacitors are applied as countermeasures to save the system. The two strategies are explained and compared and it is shown that control using the voltage at neighboring buses gives better performance.
分析和解释了NORDIC32测试系统长期电压崩溃的机理。为此,提出了一个简化的N5area测试系统,反映了NORDIC32的关键电压崩溃特性。在n5区域应用控制算法要比在NORDIC32区域容易得多。考虑了负荷恢复和发电机励磁限流是导致电压长期崩溃的两个重要因素。对长期电压不稳定情况下的动态仿真结果进行了解释和讨论。利用PV曲线分析了发电机限流器的作用。此外,采用两种不同的控制策略对并联电容器进行控制,以保护系统。对这两种策略进行了解释和比较,结果表明,利用相邻母线的电压进行控制可以获得更好的性能。
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引用次数: 5
Smart grid topics in the UPB electrical engineering curricula UPB电气工程课程中的智能电网主题
Pub Date : 2014-10-23 DOI: 10.1109/UPEC.2014.6934601
M. Albu, A. Craciunescu, A. Dumitrescu, V. Boicea, L. Toma
Smart Grids is already considered an attractive topic in the power engineering education programs. Politehnica University of Bucharest has a unique profile in the engineering higher education landscape by including among its 14 Faculties, one dedicated to Power Engineering and another one to Electrical Engineering. In this paper we focus on the smart grids topics that the students enrolled in non-power engineering programs are exposed to. We believe that these courses reflect in a high degree the smart grids philosophy, seen as a mix of communication, power transfer and information processing layers. In this paper, several courses outlines are presented as an example of developing the missing link between equipment providers and the grid stakeholders (customers, network operators and energy providers).
智能电网已被认为是电力工程教育项目中一个有吸引力的话题。布加勒斯特Politehnica University of Bucharest在工程高等教育领域拥有独特的形象,其中包括14个学院,一个致力于动力工程,另一个致力于电气工程。本文主要讨论非电力工程专业学生接触到的智能电网问题。我们认为,这些课程在很大程度上反映了智能电网的理念,被视为通信、电力传输和信息处理层的混合体。在本文中,提出了几个课程大纲,作为开发设备供应商和电网利益相关者(客户,网络运营商和能源供应商)之间缺失联系的示例。
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引用次数: 2
Implementation of distributed generation (DG) using solar energy resource to improve power system security in southern area in Libya 利用太阳能进行分布式发电,提高利比亚南部地区电力系统的安全性
Pub Date : 2014-10-23 DOI: 10.1109/UPEC.2014.6934755
F. Abusief, R. Caldon, R. Turri
The modern power systems have recently increased the interest in distributed generation (DG) technologies due to, fuel cost uncertainties, environmental constraints, and increasing power consumption with shortage of transmission capacities. Distributed generation (DG) using clean and renewable energy in power supply system have attracted serious attention. Many developing countries are adopting distributed generation (DG) technologies for their power systems expansion planning. Solar Energy is one of the most promising, nonpolluting, free source of energy. Libya is a developing country located in North Africa, most of the country's land area is desert which is wealthy in solar radiation income, found to be one of the most reliable and consistent solar energy resources. Despite of this energy resource this area (southern part) of Libya experiences permanent outages which may last for days in certain occasions. This paper investigates the implementation of distributed generation using solar energy resource to improve security of supply to these areas and emphasizes other benefits on power quality and economics.
由于燃料成本的不确定性、环境限制以及输电能力不足导致的电力消耗增加,现代电力系统最近增加了对分布式发电(DG)技术的兴趣。利用清洁能源和可再生能源在供电系统中进行分布式发电已引起人们的重视。许多发展中国家在其电力系统扩展规划中采用分布式发电(DG)技术。太阳能是最有前途的、无污染的、免费的能源之一。利比亚是一个位于北非的发展中国家,该国大部分土地面积为沙漠,太阳辐射收入丰富,是最可靠、最稳定的太阳能资源之一。尽管有这种能源资源,利比亚这个地区(南部)在某些情况下可能持续数天的永久性停电。本文探讨了太阳能分布式发电的实施,以提高这些地区的供电安全,并强调了电力质量和经济方面的其他效益。
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引用次数: 9
Project SoLa BRISTOL migration from "ecohome" to "integrated homes" SoLa BRISTOL项目从“生态家园”到“综合家园”的迁移
Pub Date : 2014-10-23 DOI: 10.1109/UPEC.2014.6934654
S. Kaushik, Mark Dale, R. Aggarwal, A. Smyth, M. Redfern, K. Waite
Project SoLa BRISTOL is a Low Carbon Network Fund project, investigating the implications of investing in DC micro-grids with local battery storage within homes, schools and offices. This provides distributed storage for both the consumer and the local utility. This storage is monitored by the utility through their sub-stations and can be used to support the network when required. This DC micro-grid incorporates a low voltage DC network within the property, providing supplies for lighting and information technology devices. The battery system is charged either through the solar PV or the public supply. AC supplies are also derived from the storage system providing improved quality of supply and cost benefits for the customer through better use of the PV generated power and “moving the time of supply use”. This paper describes the design and operation of the connected homes and compares it to the operation of battery sub-systems for the networked homes as developed for the stand alone "ecohome".
SoLa BRISTOL项目是一个低碳网络基金项目,研究在家庭、学校和办公室内投资具有本地电池存储的直流微电网的影响。这为使用者和本地实用程序提供了分布式存储。该存储由公用事业公司通过其子站进行监控,并可在需要时用于支持网络。这个直流微电网在物业内整合了一个低压直流网络,为照明和信息技术设备提供电源。电池系统通过太阳能光伏或公共电源充电。交流电源也来源于存储系统,通过更好地利用光伏发电和“移动电源使用时间”,为客户提供了更高的供电质量和成本效益。本文描述了联网家庭的设计和运行,并将其与为独立“生态家庭”开发的联网家庭电池子系统的运行进行了比较。
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引用次数: 3
XML data interface and PMU testing applications for synchrophasor estimation with a reconfigurable controller 用于同步量估计的XML数据接口和PMU测试应用程序与可重构控制器
Pub Date : 2014-10-23 DOI: 10.1109/UPEC.2014.6934779
Anastasis Katsimichas, P. Brogan, D. Laverty
Phasor Measurement Unit (PMU) technology has rapidly improved over the last two decades. This development allowed a number of conventional protocols, both open and proprietary, to be written. Optimised communication and implementation techniques are sought by academia. This motivation has resulted in university projects, such as The OpenPMU project. The aim is to create a completely open source system that will be cost efficient, reliable, modular and platform independent. The discussed work is focused on the detailed description of a data interface XML based communication tool. The outlined schema is used to exchange data between the acquisition system and the phase estimation algorithm of a PMU. Its many advantages establish it as a flexible schema for transmitting sampled data irrespective of hardware or software implementation. The OpenPMU system is based on hardware implementations that use freely available DAQ devices and aim to develop a low cost alternative to commercial PMU's. The hardware described in this paper is based on a National Instruments field programmable gate array (FPGA) reconfigurable controller (cRIO) that due to its parallel nature can perform different processing operations at the same time. This results in higher speed and accuracy and should provide the benchmark for testing various existing and future OpenPMU implementations.
相量测量单元(PMU)技术在过去二十年中得到了迅速改进。这种发展允许编写许多传统协议,包括开放的和专有的。学术界正在寻求最佳的沟通和实施技术。这种动机导致了一些大学项目,比如OpenPMU项目。其目标是创建一个完全开源的系统,该系统将具有成本效益、可靠性、模块化和平台独立性。本文重点讨论了一种基于XML的数据接口通信工具的详细描述。该模式用于在PMU的相位估计算法和采集系统之间交换数据。它的许多优点使其成为传输采样数据的灵活模式,而不考虑硬件或软件实现。OpenPMU系统基于硬件实现,使用免费的DAQ设备,旨在开发商业PMU的低成本替代品。本文所描述的硬件是基于美国国家仪器公司现场可编程门阵列(FPGA)可重构控制器(cRIO),由于其并行特性,可以同时执行不同的处理操作。这将导致更高的速度和准确性,并为测试各种现有和未来的OpenPMU实现提供基准。
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引用次数: 2
A novel policy making proposition for EV charging infrastructure management at HEI's 高等学校电动汽车充电基础设施管理的新政策建议
Pub Date : 2014-10-23 DOI: 10.1109/UPEC.2014.6934720
Y. Bhavanam, Peter Berresford, G. Taylor, Jill Langsman
This paper is based on real time EV charging infrastructure development that took place at Brunel University, which is located in west of London, UK. The aim of this paper is to establish the policy making process that has stages of an initial student-staff interest survey, records of the consultation process with EV owners, results of competitive benchmarking with other HEI's and the discussion on Type 2 Mode 3 charging stations which are 240V, 32A, 7kW, 50Hz compliant with IEC 62196 and ISO 14443 Mifare standards. The first time ever PAYG concept of POD Point Ltd is explained. Benefits of using PAYG concept for charging EV are mentioned. Various other factors that played major role were also considered as follows: deciding the tariff of the electricity used by the EV owners, charging cable compatibility with charging station, hours of operation, creation of new enforcement rules and recommendations to provide incentives that recognise and motivate EV community.
本文以英国伦敦西部布鲁内尔大学的实时电动汽车充电基础设施开发为基础。本文的目的是建立政策制定过程,包括初步的学生-员工兴趣调查,与电动汽车车主咨询过程的记录,与其他高等教育机构竞争基准的结果,以及对240V, 32A, 7kW, 50Hz符合IEC 62196和ISO 14443 Mifare标准的Type 2 Mode 3充电站的讨论。第一次解释了POD Point有限公司的现收现付概念。提到了使用现收现付概念为电动汽车充电的好处。其他发挥重要作用的因素还包括:决定电动汽车车主的电费、充电电缆与充电站的兼容性、运营时间、制定新的执法规则,以及建议提供奖励措施,以认可和激励电动汽车社区。
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引用次数: 2
期刊
2014 49th International Universities Power Engineering Conference (UPEC)
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