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Proceedings. National Power Engineering Conference, 2003. PECon 2003.最新文献

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Relaxations of metallurgraphy and TEM analysis with-conductivity of aluminum conductor 铝导体电导率的金相弛豫及TEM分析
Pub Date : 2003-12-15 DOI: 10.1109/PECON.2003.1437475
S.N. Mohtar, M. N. Jamal, M. Sulaiman
Overhead lines based on aluminum (Al) conductor have been widely used and until date, continuous effort is done to enhance their capability. This paper is discussed about the result of metallurgraphy and transmission electron microscope (TEM) that has been undertaken in Advance Material Research Center (AMREC), SIRIM. This is done to determine differences factors that influence the conductivity value between pure aluminum and. Al alloys grade 6101 that have been improved by their strength. By applying both tests, it will provide us information about the behavior of material used as cable. Because of higher resistance value of Al alloy compared to pure Al, extra changes needed to ensure higher conductivity value achieve thus increase the power transmitted in the conductor.
以铝为导体的架空线路得到了广泛的应用,迄今为止,人们一直在努力提高其性能。本文讨论了在SIRIM先进材料研究中心(AMREC)进行的金相和透射电子显微镜(TEM)研究的结果。这样做是为了确定影响纯铝和铝之间电导率值的差异因素。6101级铝合金的强度得到了提高。通过应用这两种测试,它将为我们提供有关用作电缆的材料的行为的信息。由于与纯铝相比,铝合金的电阻值更高,因此需要额外的变化来确保更高的电导率值,从而增加导体中传输的功率。
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引用次数: 0
Bifurcation analysis based performance evaluation of power system incorporating FACTS controller 基于分岔分析的FACTS控制器电力系统性能评估
Pub Date : 2003-12-15 DOI: 10.1109/PECON.2003.1437437
M. Marsadek, R. Mukerjee, B. Tanggawelu, A. Basha, A. Ariffin
The major power system breakdowns are caused by problems relating to the system dynamic responses. The limiting factor in power system operation is the damping of oscillations. The damping torque provided by the FACTS device is proportional to the gain of the controller. A power system is highly nonlinear dynamical system, having always some influence on the controller performance. An inappropriate controller setting may cause interplay between controllers dispersed system wide, leading to evolution of nonlinear dynamic phenomena such as bifurcation. It is induced by variation in control gains and system parameters. For satisfactory system operation, appropriateness of each setting of the controller needs to be evaluated for a specific operating configuration. The in-depth evaluation of a controller setting leading to fine tuning of the controller gain is feasible through bifurcation analysis.
电力系统的主要故障是由系统动态响应问题引起的。电力系统运行的限制因素是振荡的阻尼。FACTS装置提供的阻尼力矩与控制器的增益成正比。电力系统是高度非线性的动态系统,对控制器的性能总是有一定的影响。不适当的控制器设置可能会引起分散在系统范围内的控制器之间的相互作用,从而导致分叉等非线性动态现象的演变。它是由控制增益和系统参数的变化引起的。为了使系统运行满意,每个控制器设置的适当性需要针对特定的操作配置进行评估。通过分岔分析,对控制器设置进行深度评估,从而实现控制器增益的微调是可行的。
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引用次数: 2
Component based development for transient stability power system simulation software 基于组件的暂态稳定电力系统仿真软件开发
Pub Date : 2003-12-15 DOI: 10.1109/PECON.2003.1437409
H. Suyono, K. M. Nor, S. Yusof
A component-based development (CBD) approach has become increasingly important in the software industry. Any software that apply the CBD will not only save time and cost through reusability of component, but also have the capability to handle the complex problems. Since CBD design is based on object-oriented programming (OOP), the components with a good quality and reusability can be created, classified and managed for future reuse. The methodology of OOP is based on the real object. The mechanism of OOP such as encapsulation, inheritance, and polymorphism are the advantages that could be used to define real objects associated with the program. This paper focused on the implementation of the CBD to power system transient stability simulation (TSS). There are many methods to solve transient stability problem, but in this paper two methods are applied to solve TSS problems, namely trapezoidal method and modified Euler method. The performance of two approaches, CBD and non CBD applications of power system transient stability simulation is assessed through tests carried out using IEEE data test systems.
基于组件的开发(CBD)方法在软件行业中变得越来越重要。应用CBD的软件不仅可以通过组件的可重用性节省时间和成本,而且具有处理复杂问题的能力。由于CBD设计基于面向对象编程(OOP),因此可以创建、分类和管理具有良好质量和可重用性的组件,以备将来重用。面向对象的方法是基于实际对象的。OOP的机制(如封装、继承和多态性)是可以用来定义与程序相关的实际对象的优点。本文主要研究了CBD在电力系统暂态稳定仿真中的应用。求解暂态稳定问题的方法有很多,但本文采用两种方法求解TSS问题,即梯形法和修正欧拉法。通过使用IEEE数据测试系统进行测试,对电力系统暂态稳定仿真中CBD和非CBD两种方法的性能进行了评估。
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引用次数: 5
Using computer simulation as virtual implementation platforms in developing energy efficiency projects 利用计算机仿真作为开发节能项目的虚拟实施平台
Pub Date : 2003-12-15 DOI: 10.1109/PECON.2003.1437452
K. Bhattacharjee, A. Goyal, S. Mazumdar, M. Kumar
This paper highlights the advantages or simulation tools to understand application-engineering issues in energy efficiency project development by taking the case of a glass processing facility. Simulation of the proposed case was carried out to ascertain whether the acceleration and deceleration time of the blower and the thermal and mechanical stresses in the system were within the permissible limits. Simulation helped in taking into account the potential problems. In the system possibly arising due to the stress generated and thus helped in developing a proper solution. It also indicated that the success of the project largely depended on the application engineering aspects showing the cruciality of the approach undertaken.
本文以玻璃加工设施为例,强调了仿真工具在理解能效项目开发中的应用工程问题方面的优势。对所提出的情况进行了仿真,以确定鼓风机的加减速时间以及系统中的热应力和机械应力是否在允许的范围内。模拟有助于考虑到潜在的问题。在系统中可能因产生应力而产生,从而有助于制定适当的解决方案。它还指出,项目的成功在很大程度上取决于应用工程方面,这表明所采取的方法至关重要。
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引用次数: 1
Cathodic protection system 阴极保护系统
Pub Date : 2003-12-15 DOI: 10.1109/PECON.2003.1437476
S. M. Bashi, N. Mailah, M. Radzi
Cathodic protection system (CPS) is used to reduce corrosion by minimizing the difference in potential between anode and cathode. This can be achieved by applying a current to the structure to be protected from electrical source. When enough current is applied, the whole structure will be at one potential, thus anode and cathode sites will not exists. CPS is commonly used on many types of structures such as pipelines, underground storage tanks, locks and ship hulls. The main objective of this work is to discuss and compares the two methods of applying cathodic protections by using an impressed current system and sacrificial anode. The physical models were also developed for the two methods. The importance of controlling the protective current in the system is presented and discussed. Calculated and measurement results for the two methods have been presented in this paper. Measurement of output current were taken each week showed that there is a decrease in the required current according to time due to reduced of anode surface during the life of the system.
阴极保护系统(CPS)通过最小化阳极和阴极之间的电位差来减少腐蚀。这可以通过对要保护的结构施加电流来实现。当施加足够的电流时,整个结构将处于一个电位,因此阳极和阴极将不存在。CPS通常用于许多类型的结构,如管道,地下储罐,船闸和船体。本文的主要目的是讨论和比较外加电流系统和牺牲阳极两种阴极保护方法。建立了两种方法的物理模型。提出并讨论了保护电流控制在系统中的重要性。本文给出了这两种方法的计算和测量结果。每周进行的输出电流测量表明,在系统寿命期间,由于阳极表面减少,所需电流随时间而减少。
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引用次数: 14
A hybrid approach for security evaluation and preventive control of power systems 电力系统安全评估与预防控制的混合方法
Pub Date : 2003-12-15 DOI: 10.1109/PECON.2003.1437442
K. R. Niazi, C. M. Arora, S. L. Surana
This paper presents a hybrid approach for online security evaluation and preventive control of power systems. The artificial neural network (ANN) offers potential advantages regarding efficient computation and ease of knowledge acquisition. However it is a "black box" type approach, which lacks interpretability. The decision tree (DT) approach is known for its interpretability but comparatively less accurate. The proposed hybrid approach combines ANN and DT approaches to exploit their potential while suppressing their drawbacks. It applies an ANN for security evaluation of power systems and DT methodology to drive preventive control measures. A divergence based feature selection algorithm has been investigated to select an optimal combination of neural training features. The method has been applied on an IEEE power system and the results obtained are promising.
提出了一种电力系统在线安全评估与预防控制的混合方法。人工神经网络在计算效率高、知识获取容易等方面具有潜在的优势。然而,它是一种“黑匣子”类型的方法,缺乏可解释性。决策树(DT)方法以其可解释性而闻名,但相对而言不太准确。所提出的混合方法结合了人工神经网络和DT方法,以利用它们的潜力,同时抑制它们的缺点。它将神经网络应用于电力系统的安全评估,并将DT方法应用于驱动预防性控制措施。研究了一种基于散度的特征选择算法,以选择神经训练特征的最优组合。该方法已应用于IEEE电力系统,取得了良好的效果。
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引用次数: 2
Lithium-ion battery charger for high energy application 用于高能应用的锂离子电池充电器
Pub Date : 2003-12-15 DOI: 10.1109/PECON.2003.1437458
M. Elias, K. M. Nor, N. A. Rahim, A. Arof
This paper describes the design of microcontroller-based battery charger to charge lithium-ion battery pack with the charging method, balancing technique, charging control algorithm, battery protection, battery management unit and implementation of the battery charger are discussed concisely. Advantages, disadvantages and problems arise are also discussed. In fact, an excellent battery charger offers very fast charge time, full capacity and balanced battery cells, low operating temperature and highly efficient and reliable.
本文介绍了基于单片机的锂离子电池组充电充电器的设计,并对充电方法、平衡技术、充电控制算法、电池保护、电池管理单元以及电池充电器的实现进行了简要的论述。并对其优点、缺点及存在的问题进行了讨论。事实上,一个优秀的电池充电器提供非常快的充电时间,充满容量和平衡的电池,低工作温度和高效可靠。
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引用次数: 23
Identification of voltage sag origin in a measurement deficient power network 测量不足电网电压暂降来源的识别
Pub Date : 2003-12-15 DOI: 10.1109/PECON.2003.1437472
W. Mahmood, R. Mukerjee, V. Ramachandaramurthy
Voltage quality affects the system operation and the customer load operation in a distribution system. To be able to detect existence of sag and identify its cause for determining mitigation options, it is necessary to monitor the system online, to determine the probable origin of the event leading to the voltage sag. It is usual to have power quality related events, more specifically a sag or swell, surfacing at the distribution level due to a fault at the transmission level. However, it may not be possible to provide measurement facilities at each of the buses and lines in a power network, both at the transmission and distribution levels. Based on the measurements available at a single point on a distribution network, the paper suggests a procedure for identifying the location of a single line to earth fault on either the transmission or the distribution portion of the network.
在配电系统中,电压质量直接影响系统的运行和用户负荷的运行。为了能够检测暂降的存在并确定其原因以确定缓解方案,有必要在线监测系统,以确定导致电压暂降的事件的可能来源。通常会发生与电能质量相关的事件,更具体地说,是由于输电层的故障导致配电层出现凹陷或膨胀。然而,在输电和配电两级,可能不可能在电网中的每条母线和线路上都提供测量设施。本文根据配电网单点测量数据,提出了一种确定配电网输电部分或配电部分单线接地故障位置的方法。
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引用次数: 3
Power supply quality improvement: harmonic measurement and simulation 电源质量改进:谐波测量与仿真
Pub Date : 2003-12-15 DOI: 10.1109/PECON.2003.1437473
D. M. Said, N. Ahmad, A. Zin
This paper presents the harmonic measurement and simulation in a power distribution network and then gives suggestion of filter installation to improve harmonic distortion. The specific case study has been conducted at Faculty of Electrical Engineering, UTM building where nonlinear loads such as computers and fluorescent lamps which produce the harmonics are connected. Measurements are conducted at each subswitch board (SSB), main-switch board (MSB) and substation of the faculty. The selected networks are modelled and simulated using SKM-Power Tools for Windows software. The results from the measurement are compared with the simulation result, and it is found that there are quite close to each other. Based on the simulation, harmonic distortion improved after filter installation.
本文介绍了配电网的谐波测量和仿真,并提出了安装滤波器以改善谐波畸变的建议。具体的案例研究是在UTM大楼电气工程学院进行的,其中非线性负载(如计算机和产生谐波的荧光灯)是连接在一起的。测量在每个子开关板(SSB),主开关板(MSB)和学院的变电站进行。所选择的网络使用SKM-Power Tools for Windows软件进行建模和模拟。将测量结果与仿真结果进行了比较,发现两者非常接近。仿真结果表明,安装滤波器后,谐波失真有所改善。
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引用次数: 8
Current efforts in the management of power frequency electric and magnetic fields in Malaysia 马来西亚目前在工频电场和磁场管理方面的努力
Pub Date : 2003-12-15 DOI: 10.1109/PECON.2003.1437469
I. Said, A. Farag, H. Hussain, N. Rahman, T. J. Hashim
Electric and magnetic fields (EMFs) exist whenever electricity is generated, transmitted, distributed and used. Recent worldwide studies have raised questions about the possible health effects from power frequency EMFs. Information of such studies and websites of concerned groups are readily available from the Internet. These have contributed to the growth of public concerns on their possible health effects. To date, there are still many questions that heed to be answered to determine their hazards to human and the setting of limits to EMF exposures from long term, low dose power frequency electric and magnetic fields. There is, however a general agreement that better information and sincere applied research are needed in order to resolve these issues. This paper describes the activities of the EMF Research Group, Universiti Tenaga Nasional, the university owned by Tenaga Nasional Berhad, the major power utility company in Malaysia. EMF Research Group conducts systematic measurements of transmission and distribution facilities owned by Tenaga Nasional Berhad using three-axis EMDEX H meters. The results of the measurements were presented in linear magnitude versus distance graph, 3-dimensional graphs and contour plots for easy reference. Models of the facilities measured are constructed using related software packages and magnetic fields at various operating conditions are predicted. The EMF Research Group also assists Tenaga Nasional Berhad and its subsidiaries in addressing public concerns voiced through the mass media or letters sent directly to the company. Besides addressing health issues, this paper also discusses complains from other industrial and commercial facilities whose operations were affected due to high EMFs. The paper describes the measurements conducted and remedial actions recommended.
电场和磁场(emf)在电力产生、传输、分配和使用的任何时候都存在。最近世界范围内的研究对工频电磁场可能对健康造成的影响提出了质疑。这些研究的资料和有关团体的网站可在互联网上轻易取得。这些都促使公众越来越关注它们可能对健康造成的影响。迄今为止,仍有许多问题需要回答,以确定它们对人类的危害,并制定长期低剂量工频电场和磁场的EMF暴露限值。然而,人们普遍认为,为了解决这些问题,需要更好的信息和真诚的应用研究。本文描述了Tenaga国立大学EMF研究小组的活动,Tenaga国立大学是马来西亚主要的电力公用事业公司Tenaga国立Berhad拥有的大学。EMF研究小组使用三轴EMDEX H仪表对Tenaga国家有限公司拥有的输配电设施进行系统测量。测量结果以线性星等与距离图、三维图和等高线图的形式呈现,便于参考。利用相关软件包建立了实测设施的模型,并对不同运行条件下的磁场进行了预测。EMF研究小组还协助Tenaga国家有限公司及其子公司解决通过大众媒体或直接寄给公司的信件所表达的公众关切。除讨论健康问题外,本文亦讨论其他工商业设施因高电磁场而影响其运作的投诉。本文描述了所采取的措施和建议的补救措施。
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引用次数: 4
期刊
Proceedings. National Power Engineering Conference, 2003. PECon 2003.
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