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2019 IEEE PES/IAS PowerAfrica最新文献

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Impact of Solar Power and Load Demand Forecast Uncertainty on the Optimal Operation of Microgrid 太阳能发电和负荷需求预测的不确定性对微网优化运行的影响
Pub Date : 2019-08-01 DOI: 10.1109/PowerAfrica.2019.8928924
M. Husein, Il-Yop Chung
Operation optimization of a microgrid is formulated based on the forecast of renewable energy resources and electricity demand. The forecast error will introduce uncertainties thereby affecting the accuracy and optimality of the solution. In this paper, the impact of this uncertainty is investigated as it receives little attention in the literature. First, an accurate forecasting model for solar irradiance and electricity demand using long short-term memory recurrent neural network and feedforward neural network is developed. To improve the forecasting accuracy, the k-means clustering algorithm is used to partition the datasets into a number of clusters. Second, MDSTool is used to simulate a one-year operation optimization of the microgrid using both the actual and forecasted data. MDSTool is a decision support tool that we developed in our previous work. We find that the forecast errors have a significant impact on the microgrid’s annual energy savings.
基于对可再生能源资源和电力需求的预测,制定了微电网运行优化方案。预测误差会引入不确定性,从而影响解的准确性和最优性。在本文中,研究了这种不确定性的影响,因为它在文献中很少受到关注。首先,利用长短期记忆递归神经网络和前馈神经网络建立了太阳辐照度和电力需求的精确预测模型。为了提高预测精度,采用k-means聚类算法将数据集划分为多个聚类。其次,利用MDSTool对微电网的实际和预测数据进行了为期一年的运行优化模拟。MDSTool是我们在之前的工作中开发的一个决策支持工具。研究发现,预测误差对微电网的年节能效果有显著影响。
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引用次数: 5
Design Procedure of a Hybrid YBCO- Superconductor Fault Current Limiter (SFCL) for a High Voltage Substation 高压变电站用YBCO-超导混合型故障限流器的设计过程
Pub Date : 2019-08-01 DOI: 10.1109/PowerAfrica.2019.8928844
Dereje Nigussie Shawel, Getachew Bekele
In modern electric power systems, the increasing amount of on-site generation should be integrated into the power-grid. This translates to more sophisticated electric network with intrinsically high short circuit current capacity. A superconducting fault current limiter (SFCL) is taken as a solution to increase safety margin of circuit breakers (CBs) of the substation. SFCL is a device with negligible impedance under normal operating conditions that immediately switches to a high impedance state in case of over-current. At AkAki II substation, 230 kV bus-bar, a hybrid-resistive SFCL is designed. The design procedure encompasses collection of the substation data, short-circuit analysis of the substation, and designing of all parts of the SFCL. The Matlab/Simulink simulation result shows that the SFCL can minimize the maximum short-circuit current from 44 kA to 35 kA. The whole system can be implemented by $320,000/phase in 10m × 20m area by 1.8m height space of the substation.
在现代电力系统中,越来越多的现场发电需要并入电网。这转化为更复杂的电网具有本质上高的短路电流容量。采用超导故障限流器作为提高变电站断路器安全裕度的解决方案。SFCL是一种在正常工作条件下阻抗可以忽略不计的器件,在过流情况下立即切换到高阻抗状态。在AkAki II变电站,230 kV母线,设计了一个混合电阻SFCL。设计过程包括变电站数据的收集、变电站短路分析和SFCL各部分的设计。Matlab/Simulink仿真结果表明,SFCL可以将最大短路电流从44 kA减小到35 kA。整个系统在变电站1.8m高度空间内10m × 20m的面积内可实现32万美元/相。
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引用次数: 1
Towards Smart Green Energy Metering Design for OpenStack/Amazon Elastic Cloud Integration 面向OpenStack/Amazon弹性云集成的智能绿色能源计量设计
Pub Date : 2019-08-01 DOI: 10.1109/PowerAfrica.2019.8928643
K C OKAFOR, J. A. Okoye, R. Onoshakpor
Energy demand in most African countries is insufficient thereby hindering economic development. By leveraging renewable technologies, the control and management of renewable micro-grids requires a robust/reliable design that supports smart integration via Cloud for dynamic service delivery. Motivated by this concern, this paper developed smart green energy management system (SGEMS) for optimizing demand side management (DSM) in renewable micro-grids. The architecture employs solar photovoltaic (PV) to generate energy and meters user consumption pattern. SGEMS global model for solar PV metering platform is introduced including structured OpenStack Cloud application with active load-balancers, Trove/Hadoop Bigdata application program interface (API), OpenFlow firewall, and dynamic network scaling. These features manage user access with little computational overhead. An experimental demonstration of OpenStack/Amazon EC2 instance scenarios for transactional workload is briefly highlighted. The work discussed the usefulness of OpenStack engine as a distributed API middleware for SGEMS-energy application running on AWS EC2.
大多数非洲国家的能源需求不足,从而阻碍了经济发展。通过利用可再生能源技术,可再生能源微电网的控制和管理需要一个强大/可靠的设计,支持通过云进行动态服务交付的智能集成。基于此,本文开发了智能绿色能源管理系统(SGEMS)来优化可再生能源微电网的需求侧管理(DSM)。该建筑采用太阳能光伏发电(PV)来产生能量,并测量用户的消费模式。介绍了SGEMS太阳能光伏计量平台的全球模型,包括结构化的OpenStack Cloud应用,主动负载均衡器,Trove/Hadoop大数据应用程序接口(API), OpenFlow防火墙和动态网络扩展。这些特性以很少的计算开销管理用户访问。简要介绍了事务工作负载的OpenStack/Amazon EC2实例场景的实验演示。该工作讨论了OpenStack引擎作为运行在AWS EC2上的sgems能源应用程序的分布式API中间件的有用性。
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引用次数: 1
Propagation of Current and Voltage Unbalance in Electrical Power Networks 电网中电流和电压不平衡的传播
Pub Date : 2019-08-01 DOI: 10.1109/PowerAfrica.2019.8928821
Osita U. Omeje, Akintunde Samson Alayande, T. Akinbulire, F. Okafor, Jude I. Ebelechi
This paper investigates the propagation of current and voltage unbalance in an electrical power network. Such a study will reveal the techniques for inhibiting unbalance propagation. Modeling of salient network components for unbalance propagation is presented. Improved models for quantifying current and voltage unbalance are developed. Models for assessing unbalance attenuation and propagation in a network are presented. The effects of transformer winding types on unbalance propagation is presented. Case studies were used to establish unbalance propagation pattern. It was found that transformer and its winding type has the greatest effect on the attenuation and propagation of unbalance in a network. Transformer with wye neutral/wye neutral winding type is found to be the best in attenuating the unbalance caused by an electrical load. The theoretical findings were validated by capturing and analyzing real-time data on networks that supply electrical power to steel producing plants.
本文研究了电流和电压不平衡在电网中的传播。这样的研究将揭示抑制不平衡传播的技术。提出了不平衡传播显著网络分量的建模方法。改进了电流和电压不平衡的量化模型。提出了评估网络中不平衡衰减和传播的模型。分析了变压器绕组类型对不平衡传播的影响。通过实例研究建立了不平衡传播模式。结果表明,变压器及其绕组类型对网络中不平衡的衰减和传播影响最大。在衰减由负载引起的不平衡方面,采用环形中性/环形中性绕组的变压器效果最好。通过捕获和分析为钢铁生产工厂供电的网络的实时数据,验证了理论发现。
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引用次数: 1
Design of a monitoring and protection system for a vibrating coal sizing screen 振动筛监测保护系统的设计
Pub Date : 2019-08-01 DOI: 10.1109/PowerAfrica.2019.8928825
Zaita Makua, M. J. Lencwe, Raymond O. Kene, S. Daniel Chowdhury
Coal washing plants in coal mines use vibrating screens to size coal according to customer specifications and plant design. Screens are mostly used in coal washing plants, which are further used to size Run-Off-Mine coal (ROM) material after crushing them to a reduced size using roller crushers to classify bulk material and de-watering. However, the lack of/or limited safety measures on sizing screens leads to increased unmonitored noise levels caused by high vibrations, and constant damage to screen equipment, which leads to unplanned maintenance and production loss. This creates a health issue to plant employees and compromises machine safety while shortening the screens lifespan. Therefore, the paper seeks to design a monitoring and protection system for a vibrating coal sizing screen. This is done by using a vibration motion and noise sensor in order to monitor and protect the screens. By monitoring the vibration motion, messages are sent to the process and control room for further decision making. Thus, these will assist in the sequence of screen and machine stops before failure. Moreover, this enables proper maintenance scheduling and prevents extensive damage to vibrating screens.
煤矿洗煤厂采用振动筛根据客户的规格和工厂的设计对煤进行分级。筛网主要用于洗煤厂,用于对矿外煤(ROM)物料进行破碎后的分级,利用辊式破碎机对散料进行分级和脱水。然而,由于筛管尺寸安全措施的缺乏或有限,导致高振动引起的不受监控的噪音水平增加,筛管设备不断损坏,导致计划外的维护和生产损失。这给工厂员工带来了健康问题,并危及机器安全,同时缩短了屏幕的使用寿命。因此,本文试图设计一套振动筛的监测与保护系统。这是通过使用振动运动和噪声传感器来监测和保护屏幕。通过监测振动运动,信息被发送到过程和控制室,以便进一步决策。因此,这些将有助于在屏幕和机器故障前停止的顺序。此外,这可以实现适当的维护计划,并防止振动筛的大面积损坏。
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引用次数: 1
Common-Mode Voltage Reduction and Elimination in a Space Vector Modulated Three-Phase Five-Level Multistring Inverter 空间矢量调制三相五电平多串逆变器的共模降压与消压
Pub Date : 2019-08-01 DOI: 10.1109/PowerAfrica.2019.8928909
A. Balogun, Sodiq Agoro, F. Okafor, S. Adetona, O. Ojo
Methods of direct space vector modulation (SVM) schemes for reduction and complete elimination of common-mode voltage in a three-phase five-level multistring inverter are presented. Unlike Cascaded-H bridge multilevel inverters, switching cells of multistring inverters share the middle leg power semiconductors, which switch at or about the line frequency, for reduced number of switching devices. Therefore, the sequence of turn on and turn off is carefully selected by fulfilling Kirchhoff’s voltage law to avoid short circuiting the voltage sources. In the reduced common-mode voltage scheme, a method of decomposing the reference voltage vectors to the switching functions and times with zero and Vdc/3 common-mode voltages is developed. Furthermore, a technique of complete common-mode voltage elimination is proposed. Results and discussion for both SVM schemes are presented.
提出了用直接空间矢量调制(SVM)降低和完全消除三相五电平多串逆变器共模电压的方法。与级联h桥多电平逆变器不同,多串逆变器的开关单元共用中间支路功率半导体,其开关频率为线频或线频左右,以减少开关设备的数量。因此,通过满足基尔霍夫电压定律,仔细选择通断顺序,避免电压源短路。在降低共模电压方案中,提出了一种将参考电压矢量分解为零和Vdc/3共模电压下的开关函数和开关次数的方法。此外,还提出了一种完全共模电压消除技术。给出了两种支持向量机方案的结果和讨论。
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引用次数: 2
Recent advances in solar energy harvesting materials with particular emphasis on photovoltaic materials 太阳能收集材料的最新进展,特别是光伏材料
Pub Date : 2019-08-01 DOI: 10.1109/PowerAfrica.2019.8928859
R. Koech, M. Kigozi, A. Bello, P. A. Onwualu, W. Soboyejo
The use of solar energy, as an alternative to the conventional fossil fuel based resources, has increased tremendously over the years due to its enormous and environmentally benign nature. In an effort to make solar energy harnessing more efficient and affordable, various technologies have been developed. The solar thermal technologies have achieved very impressive solar conversion efficiencies and are fully commercialized. However, PV technology is still undergoing rapid evolution in an effort to achieve high efficiencies and to reduce the cost. New materials, concepts and approaches in solar cell development have become the center of research in this field. This article gives a review on the progress of PV technology with a keen interest on the emerging PV materials that hold the prospects for achieving high efficiencies at low costs.
作为传统化石燃料资源的替代品,太阳能的使用由于其巨大和无害环境的性质,多年来急剧增加。为了提高太阳能利用的效率和价格,人们开发了各种技术。太阳能热技术已经取得了令人印象深刻的太阳能转换效率,并完全商业化。然而,为了实现高效率和降低成本,光伏技术仍在经历快速发展。太阳能电池发展中的新材料、新概念和新方法已成为该领域的研究中心。本文综述了光伏技术的进展,重点介绍了具有低成本、高效率前景的新兴光伏材料。
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引用次数: 5
Implementation of Control Performance Standards in Southern African Power Pool 南部非洲电力联营控制绩效标准的实施
Pub Date : 2019-08-01 DOI: 10.1109/PowerAfrica.2019.8928654
S. Zimba
The number and size of interconnected electric power systems is growing in the world, promoting electricity trading necessary for socio-economic growth. Interconnections are generally more reliable than isolated power systems. The increased reliability is rarely achieved without shared responsibility among System Operators. In this regard, implementing and adhering to common power system operations standards is very important. This paper presents the implementation of Control Performance Standards (CPS1 and CPS2) in the Southern African Power Pool (SAPP) Interconnection. These standards were adopted from North American Electric Reliability Corporation (NERC) of the US. The paper presents how input parameters for calculation of CPS1 and CPS2 were determined in SAPP. Based on real one-month data from year 2018, all SAPP Control Area Operators passed CPS1 and CPS2, except for one which failed CPS1 only. Lessons learnt from implementing CPS1 and CPS2 in SAPP are discussed in this paper.
互联电力系统的数量和规模在世界范围内不断增长,促进了社会经济增长所必需的电力交易。互连通常比孤立的电力系统更可靠。如果没有系统操作人员的共同责任,就很难实现可靠性的提高。在这方面,执行和坚持通用的电力系统运行标准是非常重要的。本文介绍了控制性能标准(CPS1和CPS2)在南部非洲电力联营(SAPP)互联中的实施情况。这些标准是由美国北美电力可靠性公司(NERC)采用的。本文介绍了如何在SAPP中确定计算CPS1和CPS2的输入参数。根据2018年一个月的真实数据,除了一名控制区操作员仅通过CPS1外,所有SAPP控制区操作员都通过了CPS1和CPS2。本文讨论了在SAPP中实施CPS1和CPS2的经验教训。
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引用次数: 0
Embedded Generation in Nigeria: Port Harcourt 132/33kV Case Study 尼日利亚嵌入式发电:哈科特港132/33kV案例研究
Pub Date : 2019-08-01 DOI: 10.1109/PowerAfrica.2019.8928635
C. Opata, A. Ekwue, T. Madueme
This paper considers the evaluation of the integration of Trans Amadi Gas Turbine Plant, which is an embedded generation (EG) Plant in the Rivers State of Nigeria Power sub-network, within the Nigeria Electricity Supply Industry (NESI). The degree of EG penetration on the network is also considered alongside its impact on the load factor. This study uses the Power Systems Software for Engineering (PSS/E) for network modelling and simulation studies. With the EG in operation and out of operation, the Newton Raphson’s load flow method is used to investigate the network power losses, voltage profiles and load angles, while conventional methods are used for the determination of the degree of penetration of the EG as well as its impact on load factor. The results of this study show the 14.47% penetration level of the considered EG plant, generally improves the network voltage profile and reduces the active power losses from 14.47MW to 7.77MW while improving on the consumers’ utilization efficiency. The gains of this study can be consolidated to help utilities satisfy their license obligations for quality of supply, consumers’ satisfaction and to improve their revenue earnings.
本文考虑对尼日利亚电力供应行业(NESI)内的跨阿马迪燃气轮机厂进行整合评估,该电厂是尼日利亚河流州电力子网中的嵌入式发电(EG)电厂。除了对负载因子的影响外,还考虑了EG在网络上的渗透程度。本研究使用电力系统工程软件(PSS/E)进行网络建模和仿真研究。在EG运行和不运行的情况下,采用Newton Raphson负荷潮流法研究电网的网损、电压分布和负荷角,采用常规方法确定EG的渗透程度及其对负荷因子的影响。研究结果表明,考虑的EG电厂14.47%的渗透率水平,总体上改善了电网电压分布,将有功功率损耗从14.47MW降低到7.77MW,同时提高了用户的利用效率。本研究的成果可以整合起来,以帮助公用事业公司履行其对供应质量、消费者满意度和提高收入的许可义务。
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引用次数: 0
Design and Development of a Variable-Duty Solar-Powered Fluid Pump for Rural and Industrial Adaptation 一种适应农村和工业的可变负荷太阳能流体泵的设计与开发
Pub Date : 2019-08-01 DOI: 10.1109/PowerAfrica.2019.8928634
F. Fameso, E. C. Egbulefu, J. Audu, O. Imoru
Africa is strategically positioned to reap massively from investing in harnessing its solar energy potentials. Research and development efforts are beginning to pave way for innovation, promotion and investments in inclusive, sustainable, clean and more efficient renewable energy sources such as solar energy which if well harnessed can provide up to 5000 TWH of cheap, readily available and renewable energy annually. This paper presents the design and development of a computerized duty-selector-controlled variable-duty solar-powered fluid pump which finds applications from small scale domestic, to heavy-duty industrial and agricultural purposes. It involves the fundamentals of design and construction of pumps, solar to electrical energy and software programming with C# programming language. The product was successfully built and pilot tested, pumping water from two storage tanks at ground level to a 10 metres high overhead tank with a capacity of 600 litres within 30 minutes.
非洲的战略定位是通过投资利用其太阳能潜力获得巨大收益。研究和开发工作正在开始为创新、促进和投资包容性、可持续、清洁和更高效的可再生能源铺平道路,如太阳能,如果利用得当,每年可提供高达5000太瓦时的廉价、现成和可再生能源。本文介绍了一种计算机选择器控制的可变负载太阳能流体泵的设计和开发,它可以从小型家用到重型工业和农业用途。它涉及泵的设计和构造,太阳能到电能以及使用c#编程语言进行软件编程的基础知识。该产品已成功制造并进行了中试,在30分钟内将两个地面储水罐中的水抽到一个10米高、容量为600升的架空储水罐中。
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引用次数: 0
期刊
2019 IEEE PES/IAS PowerAfrica
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