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2019 Southern African Universities Power Engineering Conference/Robotics and Mechatronics/Pattern Recognition Association of South Africa (SAUPEC/RobMech/PRASA)最新文献

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Voltage Profile and Power Losses Analysis on a Modified IEEE 9-Bus System with PV Penetration at the Distribution Ends 一种改进的IEEE 9总线系统在配电端光伏渗透下的电压分布和功率损耗分析
Kabulo Loji, I. Davidson, R. Tiako
Historically, distribution networks were made to connect consumer loads with no generating units at the point of consumption. For the last two decades, in response to increase electricity demand and environmental policies, decentralized generation, mainly constituted of Renewable Generation Sources (RES), also called Distributed Generators (DG), have massively and rapidly developed. The integration of DG units however, increase uncertainty in power system operation as they modify both the structure and the operation of the distribution networks, changing the magnitude and direction of network power flows. There is a need to investigate both the “effects and impact” of increasing penetration and siting of these intermittent RES on voltage and frequency stability power system and, the utilization of such sources to improve voltage stability margins. This paper presents different scenario of voltage stability studies in a static analysis mode in order to support voltage profile and reduce power line losses using photovoltaic systems. DigSILENT™ PowerFactory™ was used to conduct the investigation.
从历史上看,配电网是为了在消费点连接没有发电机组的消费者负荷。近二十年来,为了应对日益增长的电力需求和环境政策,以可再生能源(RES)为主的分散式发电,也称为分布式发电机(DG),得到了大规模而迅速的发展。然而,DG机组的集成增加了电力系统运行的不确定性,因为它们改变了配电网的结构和运行,改变了电网潮流的大小和方向。有必要研究增加这些间歇性可再生能源的渗透和选址对电压和频率稳定电力系统的“影响和影响”,以及利用这些源来提高电压稳定裕度。本文提出了在静态分析模式下电压稳定性研究的不同场景,以支持电压分布和减少光伏系统的电力线路损耗。使用DigSILENT™PowerFactory™进行调查。
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引用次数: 4
A Review on Active Distribution System State Estimation 配电系统主动状态估计研究进展
J. Watitwa, K. Awodele
State estimation is crucial in the development of adequate network models for power system monitoring and analysis. It is the computing of the nearest estimation of the nodal voltage magnitude and phasor angle using measurements populated from the power system. Since its inception in the 1970s Power System State Estimation (PSSE) has been extensively researched and applied in power transmission systems. However, monitoring of the voltage magnitudes and line power flow beyond the distribution substations is only a recent phenomenon, hence distribution state estimation is still uncommon. The need for Distribution System State Estimation (DSSE) is important since modern power systems comprise of distributed generation (DG) in consumer networks, that is; active distribution networks. This paper reviews early work in PSSE and DSSE. Bad data detection and identification, network observability analysis, meter placement and future research work directions are discussed.
状态估计对于建立适合电力系统监测和分析的网络模型至关重要。它是利用电力系统的测量值来计算节点电压幅值和相角的最接近估计。自20世纪70年代提出以来,电力系统状态估计(PSSE)在输电系统中得到了广泛的研究和应用。然而,对变电站以外的电压值和线路潮流的监测只是最近才出现的现象,因此配电状态估计仍然不常见。由于现代电力系统由用户网络中的分布式发电(DG)组成,因此对配电系统状态估计(DSSE)的需求非常重要。活跃的分销网络。本文综述了PSSE和DSSE的早期工作。讨论了不良数据的检测与识别、网络可观测性分析、仪表的放置以及今后的研究工作方向。
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引用次数: 7
Dynamics of Maximum Power Point Wind Energy Battery Charging Systems 最大功率点风能电池充电系统动力学
T. Kanda, L. P. Mdakane, C. Labuschagne, M. Kamper
In this paper the dynamics of a maximum power point wind energy battery charging system and the implementation of a DC to DC converter is investigated. The required design specifications for a sub 5 kW wind generator are discussed as well as the modelling of the different components of the wind energy system. The duty cycle control of the DC to DC converter for maximum power point tracking at different wind speeds is done by implementing a functional generator. The functional generator adjusts the duty cycle of the converter according to the generator speed. In order to investigate the duty cycle control method and the system’s stability the system is simulated with MATLAB Simulink to determine the response. It was found that the proposed duty cycle control method is effective in maximum power point tracking. Also, that the system’s response is stable for higher frequency disturbances.
本文研究了一种最大功率点风能电池充电系统的动力学特性和直流变换器的实现。讨论了5千瓦以下风力发电机所需的设计规范以及风能系统不同组件的建模。通过实现一个功能发电机,实现了不同风速下最大功率点跟踪的DC - DC变换器的占空比控制。功能发电机根据发电机转速调节变流器的占空比。为了研究占空比控制方法和系统的稳定性,利用MATLAB Simulink对系统进行仿真,确定系统的响应。结果表明,所提出的占空比控制方法在最大功率点跟踪中是有效的。同时,系统对高频干扰的响应是稳定的。
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引用次数: 2
Application of PSB, PSAT and ATP Tools in Traction Surge Arrester Selections PSB、PSAT和ATP工具在牵引避雷器选择中的应用
Mdu Mzulwini, K. Awodele
This paper highlights important surge arrester parameters in the performance evaluation of surge arresters. Matlab power system blockset (PSB) and alternate transient program (ATP) models and simulation results of the East Grid Traction Network (EGTN) case study are presented. These simulation results are utilized in evaluating surge arrester performances for traction applications. A surge arrester selection guideline for traction applications is also given.
本文重点介绍了避雷器性能评价中的重要避雷器参数。给出了电力系统块集(PSB)和交替暂态程序(ATP)的Matlab模型,并以东电网牵引网(EGTN)为例进行了仿真研究。这些模拟结果用于评估牵引应用中避雷器的性能。还给出了牵引应用的避雷器选择指南。
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引用次数: 1
A Study of Spatial distribution of the Electric Field under the Influence of Temperature with DC Supply 温度影响下直流电源电场空间分布的研究
J. S. Djeumen, J. Walker, N. West
Partial discharge, space charge and electric ion fields are phenomena that are responsible for flashovers on transmission lines and most of time cause power losses. These consequences lead to interruptions and loss of power supply. Atmospheric conditions in general and the temperature in particular is still not fully understood under DC excitation, especially when the applied voltage approached the critical breakdown value. Temperature has a great influence on corona discharge. In this study, the impact of temperature on the spatial distribution of the electric field, which can also be considered as one space charge source under DC supply was studied. A laboratory size corona cage with an aluminum tern conductor at its center, for the experiments in the high voltage laboratory. The purpose of this study was to investigate the effect of the temperature on the spatial distribution on the DC conductor with the maximum DC voltage applied of ±175 kV and have a better understanding of the major factors that influence the spatial distribution processes under a high temperature. The corona camera version 8 (CoroCam8) was used to visualize the spatial distribution around the conductor. This has enabled to observe the effect of the temperature with the variation of the DC voltage, passing through inception voltage with the increased up to ±175 kV. The spatial distribution is denser when the temperature is high for the positive voltage and for the negative voltage.
局部放电、空间电荷和离子场是引起输电线路闪络的主要现象,多数情况下会造成电力损失。这些后果导致电力供应中断和损失。在直流激励下,特别是当外加电压接近临界击穿值时,一般的大气条件,特别是温度,仍然不能完全理解。温度对电晕放电有很大影响。本研究研究了温度对电场空间分布的影响,电场也可以看作是直流供电下的一个空间电荷源。实验室大小的电晕笼,中心有铝导体,用于高压实验室的实验。本研究的目的是研究在直流最高电压为±175 kV时,温度对直流导体空间分布的影响,从而更好地了解高温下影响空间分布过程的主要因素。电晕相机版本8 (CoroCam8)用于可视化导体周围的空间分布。这样就可以观察到温度随直流电压变化的影响,通过起始电压随增加可达±175 kV。正电压和负电压温度越高,空间分布越密集。
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引用次数: 0
Coal Fired Power Plant In-Phase Bus Transfer Simulation of Forced and Induced Draught Fan Motors 燃煤电厂强迫风机和诱导风机电机的同相母线传递仿真
V. Mathebula, A. Saha
Application of fast bus transfer schemes requires high speed circuit breakers in order to minimise the dead-time during the transfer process. On the other hand, combination of high and low inertia loads such as fans, pumps and mills leads to an increase in residual bus voltage frequency decay rate; which often result in fast bus transfer scheme failing to execute. In-phase bus transfer scheme, although slower than fast bus transfer scheme; can be considered as an alternate transfer process to transfer load when main power supply is lost as a result of upstream equipment failure. Unlike in the case of fast bus transfer scheme, high decay rate of residual voltage frequency is favorable for in-phase bus transfer process; while circuit breaker closing time does not necessarily impact the performance of the transfer scheme. The paper investigates the application of in-phase bus transfer scheme to transfer load to an alternate supply when the main supply is lost in a power plant unit auxiliary power distribution system. Simulation results presented in the paper indicate that in-phase bus transfer scheme can be used to transfer draught fan motors to an alternate supply while maintaining stable boiler furnace pressure, and therefore maintain process continuity.
快速公交换乘方案的应用需要高速断路器,以尽量减少换乘过程中的死区时间。另一方面,风机、泵、磨机等高、低惯性负荷的组合导致剩余母线电压频率衰减率增加;这往往导致快速总线转换方案无法执行。同相总线换乘方案,虽然比快速总线换乘方案慢;当上游设备故障导致主电源丢失时,可将其视为转移负荷的备用转移过程。与快速母线传输方案不同,高的剩余电压频率衰减率有利于同相母线传输过程;而断路器合闸时间并不一定影响转移方案的性能。本文研究了在电厂机组辅助配电系统中,当主电源丢失时,采用同相母线转移方案将负荷转移到备用电源上的应用。仿真结果表明,采用同相母线转换方案可以在保持锅炉炉膛压力稳定的情况下,将风机电机转移到备用电源,从而保持工艺的连续性。
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引用次数: 9
Multi-Class Weather Classification from Still Image Using Said Ensemble Method 基于集成方法的静态图像多类天气分类
Ajayi Gbeminiyi Oluwafemi, Wang Zenghui
In the field of computer vision, multi-class outdoor weather classification is a difficult task to perform due to diversity and lack of distinct weather characteristic or features. This research proposed a novel framework for identifying different weather scenes from still images using heterogeneous ensemble methods. Our approach is based on a method called Selection Based on Accuracy Intuition and diversity (SAID) of stacked ensemble algorithms. This involves the extraction of histogram of features from different weather scenes. The blending and boosting of different weather features using stacked ensemble algorithms increases recognition rate of different weather conditions compared to other classification and ensemble methods. The paper presents academic and practitioners a new insight into diversity of heterogeneous ensemble methods for solving the challenges of weather recognition from still images.
在计算机视觉领域,由于天气特征的多样性和缺乏鲜明的特征,多类室外天气分类是一项困难的任务。本研究提出了一种利用异构集成方法从静止图像中识别不同天气场景的新框架。我们的方法是基于堆叠集成算法的基于精度直觉和多样性的选择(SAID)方法。这涉及到从不同天气场景中提取特征的直方图。与其他分类和集成方法相比,使用叠加集成算法对不同天气特征进行混合和增强,提高了不同天气条件的识别率。本文为解决静态图像天气识别挑战的异构集成方法的多样性提供了新的见解。
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引用次数: 13
SAUPEC/RobMech/PRASA 2019 Message from the General Chair SAUPEC/RobMech/PRASA 2019总主席致辞
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引用次数: 0
The HEPSSA Project – A Catalyst for Capacity Building at Durban University of Technology HEPSSA项目——德班理工大学能力建设的催化剂
I. Davidson
The Higher Education Partnerships in Sub Saharan Africa project is funded by the British Royal Academy of Engineering, and runs for 2 years from April 2017 to March 2019. It is a network of engineering faculties and schools in some Eastern and Southern African universities linked to a UK university with the aim of enhancing quality of engineering education and training. The project objective is to enhance the quality of engineering education and training through: academic staff secondment to industry; invitation of industry experts to university as guest lecturers; collaborative research with industry, industry supported curriculum review and knowledge sharing workshops. This paper presents the activities at Durban University of Technology and our efforts to enhance engineering training of technical staff through short-term industry internships and postgraduate studies. The goal is to produce graduate engineers and technicians: who possesses relevant skills, meet the expectations of modern industry and engineering professional bodies; graduates who are employable nationally and regionally. It is also expected to produce academic staff with enhanced practical experience and better teaching skills, which will enrich the relevant engineering curriculum at universities.
撒哈拉以南非洲地区高等教育合作项目由英国皇家工程院资助,为期两年,从2017年4月到2019年3月。它是一个由一些东部和南部非洲大学的工程学院和学校组成的网络,与一所英国大学有联系,目的是提高工程教育和培训的质量。该项目的目标是通过以下方式提高工程教育和培训的质量:借调学术人员到工业界;邀请行业专家到大学做客座讲师;与工业界的合作研究,工业界支持的课程审查和知识共享研讨会。本文介绍了德班理工大学的活动,以及我们通过短期行业实习和研究生学习加强技术人员工程培训的努力。目标是培养具有相关技能,符合现代工业和工程专业团体期望的研究生工程技术人员;能够在全国和地区就业的毕业生。此外,我们期望能培养出具有更丰富实践经验和更佳教学技巧的学术人员,从而丰富大学的相关工程课程。
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引用次数: 1
A Distributed Framework for Programming the Artificial Intelligence of Mobile Robots in Smart Manufacturing Systems 智能制造系统中移动机器人人工智能编程的分布式框架
N. Naidoo, G. Bright, R. Stopforth
Mobile robots have provided solutions for materials handling operations in Advanced Manufacturing Systems. The smart manufacturing system of today relies on intelligent machines, devices and logistics integration to meet the challenges of consumer demands and mass customization. Machine (or robot) integration allows data access of high level supply chain silos. This provides for intelligent, machine programming that expedites processes to meet the change in consumer demands. The motivation of the research study was based around the consumer market and the Fourth Industrial Revolution, Industry 4.0. The paper discusses the design, development and example of a framework for the robotic automation industry. The feature of the framework is distributive in architecture. This meets some of the challenges and requirements for a smart manufacturing system.
移动机器人为先进制造系统中的物料搬运操作提供了解决方案。当今的智能制造系统依靠智能机器、设备和物流集成来满足消费者需求和大规模定制的挑战。机器(或机器人)集成允许访问高级供应链孤岛的数据。这提供了智能,机器编程,加快过程,以满足消费者需求的变化。研究的动机是基于消费市场和第四次工业革命,工业4.0。本文讨论了机器人自动化工业框架的设计、开发和实例。该框架在体系结构上具有分布式的特点。这满足了智能制造系统的一些挑战和要求。
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引用次数: 5
期刊
2019 Southern African Universities Power Engineering Conference/Robotics and Mechatronics/Pattern Recognition Association of South Africa (SAUPEC/RobMech/PRASA)
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