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2014 IEEE International Conference on Power and Energy (PECon)最新文献

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Evaluation of measurement uncertainty in induction machines efficiency estimation 感应电机效率评估中测量不确定度的评定
Pub Date : 2014-12-01 DOI: 10.1109/PECON.2014.7062458
M. Al-Badri, P. Pillay
Any measurement process has always its inherent uncertainty due to different error sources. Identifying measurement uncertainties is important to make any measurement results reliable and credible. In this paper, 3 different induction motors were tested for efficiency using the direct method (dynamometer procedure) and a proposed algorithm of estimating full-load efficiency from only one no-load test.
由于误差源的不同,任何测量过程都有其固有的不确定度。确定测量不确定度对于使任何测量结果可靠和可信非常重要。本文采用直接法(测功机程序)测试了3种不同的感应电机的效率,并提出了一种仅从一次空载测试中估计满负荷效率的算法。
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引用次数: 9
The effect of electromagnetic fields due to hv line on the parallel pipeline 高压管线电磁场对并联管线的影响
Pub Date : 2014-12-01 DOI: 10.1109/PECON.2014.7062407
C. S. Chai, Mohd Zainal Abidin Ab Kadir, M. Izadi, J. Jasni, C. Gomes
The effects of electromagnetic fields(EMF) due to high voltage line on the parallel pipeline are not a common issue nowadays. The EMF will bring up some pipeline problems and safety issues. There are only a few of previous studies about EMF effects consider in the lightning fault parameter and study in term of currents. This means the EMF effect of the transmission line to the pipeline still not completed. A study has been carried out to determine the effect of electromagnetic field in term of voltage and current of the shared corridor between the transmission tower and the pipeline. This study is simulated by using ANSYS Maxwell software. The induced voltage obtained is in the range of 2.6089V to 4.7723V which within the maximum acceptable value (15V) of IEEE 80-2000 standards. The induced current obtained is in the range of 3.1893nA to 61.4640 nA. Besides, mitigation is also discussed.
高压线路产生的电磁场对并联管线的影响目前还不是一个常见的问题。EMF会带来一些管道问题和安全问题。以往关于电动势效应的研究很少从雷电故障参数和电流角度进行考虑。这意味着电动势对传输线到管道的影响仍未完成。研究了电磁场对输电塔与管道共用走廊电压和电流的影响。利用ANSYS Maxwell软件对该研究进行了仿真。得到的感应电压范围为2.6089V ~ 4.7723V,在IEEE 80-2000标准的最大可接受值(15V)范围内。得到的感应电流范围为3.1893nA ~ 61.4640 nA。此外,还讨论了缓解问题。
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引用次数: 1
A simple new control method for matrix converter especially with high number of input phases 针对矩阵变换器中输入相数较多的情况,提出了一种简单的新型控制方法
Pub Date : 2014-12-01 DOI: 10.1109/PECON.2014.7062467
A. Syukri Mohamad, N. Mariun
The matrix converter is a forced commutated cycloconverter (FCC), which get a significant attention in the last several years due to the advance in digital and logic devices technology. The main advantage of FCC compared to the naturally commutated cycloconverter (NCC) is that it has only a single stage conversion. While NCC has restricted frequency conversion ability, the matrix converter can possess a wide range of frequency conversion, depending on the switching strategy. Previous known control methods for matrix converters are such as Venturini method, Roy method, PWM method, predictive control, fuzzy logic control and artificial neural network control. This paper will discuss a simple new perspective of the switching strategy for a new control method of a multi-phase to single-phase or 3-phase matrix converter with the ability to change the input frequency into a lower frequency output and also higher frequency output. The new switching strategy then validated using 36-phase to 3-phase matrix converter modeling and simulation in Matlab/Simulink.
矩阵变换器是一种强制整流环变换器(FCC),近年来由于数字和逻辑器件技术的进步而受到广泛关注。与自然整流循环变换器(NCC)相比,FCC的主要优点是它只有单级转换。而NCC的变频能力有限,矩阵变换器可以拥有广泛的频率转换,这取决于开关策略。以前已知的矩阵变换器控制方法有文丘里尼法、罗伊法、PWM法、预测控制、模糊逻辑控制和人工神经网络控制等。本文将从一个简单的新角度讨论一种新的开关策略,用于多相到单相或三相矩阵变换器的新控制方法,该方法具有将输入频率改变为低频输出和高频输出的能力。然后在Matlab/Simulink中对36相- 3相矩阵变换器进行建模和仿真,验证了新的开关策略。
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引用次数: 5
Improving Lagrangian Relaxation Unit Commitment with Cuckoo Search Algorithm 用布谷鸟搜索算法改进拉格朗日松弛单元承诺
Pub Date : 2014-12-01 DOI: 10.1109/PECON.2014.7062417
H. Zeynal, Li Hui, Y. Jiazhen, M. Eidiani, B. Azzopardi
In many utilities, it is essential to devise an optimum commitment solution of generating units for better operational efficiency, under empirical conditions. Among the methods reported in the technical literatures, Dynamic Programming (DP), Lagrangian Relaxation (LR), and Mixed-Integer Programming (MIP) are the most industry proven algorithms in the line of business. This paper improves the available solution offered in LR technique, which was mainly suffered from high fluctuation of duality gap between the primal and dual solutions. As a remedy, a Cuckoo Search Algorithm (CSA) is proposed to optimize the gap progress throughout the LR solution process. Simulation results reiterate that the developed LR-UC integrating CSA enhances the solution quality.
在许多公用事业中,为获得更好的运行效率,在经验条件下设计发电机组的最佳负荷方案是必不可少的。在技术文献中报道的方法中,动态规划(DP)、拉格朗日松弛(LR)和混合整数规划(MIP)是行业中最成熟的算法。本文改进了LR技术中存在的原解与对偶解之间对偶间隙波动大的问题。为此,提出了一种布谷鸟搜索算法(CSA)来优化整个LR求解过程中的间隙进度。仿真结果表明,集成CSA的LR-UC提高了解决方案的质量。
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引用次数: 13
Investigation on the lightning breakdown voltage of Palm Oil and Coconut Oil under non-uniform field 非均匀电场条件下棕榈油和椰子油雷电击穿电压的研究
Pub Date : 2014-12-01 DOI: 10.1109/PECON.2014.7062402
Y. V. Thien, N. Azis, J. Jasni, M. A. Ab. Kadir, R. Yunus, M. T. Ishak, Z. Yaakub
The increasing interests on the Palm Oil (PO) and Coconut Oil (CO) as a potential alternative for dielectric insulating fluid in transformers encourage a number of researches on different aspects of these oils. Among the common areas under study is the lightning breakdown voltage. In this paper, the lightning breakdown voltage of PO and CO is examined. The type of PO used in this study is Refined, Bleached and Deodorized Palm Oil (RBDPO) Olein. The testing was carried out under non-uniform electric field using needle-sphere electrodes configuration. The influence of the testing methods, rising-voltage and up-and-down on the breakdown voltages are investigated for both types of oils. It was found that the lightning breakdown voltage performance for some of the RBDPO is comparable to Mineral Oil (MO).
棕榈油(PO)和椰子油(CO)作为变压器中介电绝缘流体的潜在替代品的兴趣日益增加,鼓励了对这些油的不同方面的研究。雷电击穿电压是研究的共同领域之一。本文研究了PO和CO的雷电击穿电压。本研究中使用的PO类型是精炼、漂白和脱臭的棕榈油(RBDPO)油苷。采用针球电极结构,在非均匀电场条件下进行了测试。研究了试验方法、升压和升降对两种油品击穿电压的影响。研究发现,部分RBDPO的雷电击穿电压性能可与矿物油(MO)媲美。
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引用次数: 9
Evaluating the unbalances in sarawak transmission lines using PSCAD/EMTDC 利用PSCAD/EMTDC评估砂拉越输电线路的不平衡
Pub Date : 2014-12-01 DOI: 10.1109/PECON.2014.7062444
Liu Sai Kwong
This paper describes the electromagnetic transient study carried out to calculate the degree of unbalance in existing transmission network in Sarawak. It first discusses the modelling of the transmission grid in PSCAD/EMTDC and the verification of the simulation model against real-time recordings. The paper then provides estimation on the current unbalances in individual circuit and paralleled circuits due to the net through system unbalance and circulating currents based on the positive, negative and zero sequence currents obtained in the simulation. Based on simulation, different phasing arrangements are also assessed to reduce the amount of line unbalance.
本文介绍了为计算砂拉越现有输电网的不平衡程度而进行的电磁暂态研究。首先讨论了PSCAD/EMTDC中输电网的建模,并根据实时记录验证了仿真模型。然后根据仿真得到的正序、负序和零序电流,通过系统不平衡和循环电流对单个电路和并联电路中由于网络引起的电流不平衡进行估计。在仿真的基础上,还评估了不同的相位安排,以减少线路不平衡量。
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引用次数: 1
Modeling of polymer nanocomposites: Permittivity vs. electric field intensity 聚合物纳米复合材料的建模:介电常数与电场强度
Pub Date : 2014-12-01 DOI: 10.1109/PECON.2014.7062429
K. Y. Lau, N. A. Muhamad, N. Bashir, Y. Arief, M. Piah, A. Vaughan, G. Chen
The use of polymer nanocomposites - a material system composed of nanometer-sized fillers (nanofillers) homogeneously dispersed in polymers - is predicted to be capable of enhancing the performance of electrical insulation systems without compromising the thermal, mechanical and economic requirements. This is believed to be related to the much smaller size of the fillers, which subsequently leads to the presence of an extensive interphase - an interaction zone between the nanofiller and the polymer. Nevertheless, understanding of the concept of interphase within nanocomposites is unsatisfactory and, consequently, many experimental results remain unexplained. This paper attempts to model a polymer nanocomposite system, in particular, in relation to the effects of permittivity of a nanometer-sized particle and its interphase on the electric field distribution within the resulting nanocomposites. Results show that varying the permittivity of the nanoparticle and the interphase will result in increased or reduced electric field intensity within the nanocomposites. This will help to clarify the effects of the nanometre-sized particle and its interphase on the electric field distribution within nanocomposites, and determine appropriate combinations of nanofiller/polymer for different dielectric applications.
聚合物纳米复合材料——一种由纳米尺寸的填料(纳米填料)均匀分散在聚合物中的材料体系——的使用被预测能够在不影响热、机械和经济要求的情况下提高电绝缘系统的性能。这被认为与填料的尺寸小得多有关,这随后导致了广泛的间相的存在-纳米填料和聚合物之间的相互作用区。然而,对纳米复合材料中界面概念的理解并不令人满意,因此,许多实验结果仍然无法解释。本文试图建立一个聚合物纳米复合材料系统的模型,特别是纳米粒子及其界面相的介电常数对所得到的纳米复合材料内电场分布的影响。结果表明,改变纳米颗粒和界面相的介电常数会导致纳米复合材料内电场强度的增加或减少。这将有助于阐明纳米颗粒及其界面相对纳米复合材料内部电场分布的影响,并确定纳米填料/聚合物在不同介质应用中的适当组合。
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引用次数: 6
A study on the dielectric properties of Palm Oil and Coconut Oil 棕榈油和椰子油介电性能的研究
Pub Date : 2014-12-01 DOI: 10.1109/PECON.2014.7062423
N. A. Mohamad, N. Azis, J. Jasni, M. A. Ab. Kadir, R. Yunus, M. T. Ishak, Z. Yaakub
One of the important parameter for insulating fluid is the dielectric properties. With the introduction of vegetable oil as possible alternative fluid for transformers application, it is essential to ensure this type of oil could meet the dielectric properties requirement. In this paper, a study is carried out to investigate the dielectric properties of Palm Oil (PO) and Coconut Oil (CO). The type of PO used in this study is Refined, Bleached and Deodorized Palm Oil (RBDPO) Olein. Several parameters such as AC breakdown voltage, dielectric dissipation factor, relative permittivity and resistivity are examined for both as-received and dried samples. It was found that there are differences on the dielectric dissipation factor and resistivity between RBDPO and CO and the dielectric properties performances of all samples are improved after subjected to the drying procedure.
绝缘流体的一个重要参数是介电性能。随着植物油作为变压器应用的可能替代流体的引入,确保这类油能够满足介电性能要求至关重要。本文对棕榈油(PO)和椰子油(CO)的介电性能进行了研究。本研究中使用的PO类型是精炼、漂白和脱臭的棕榈油(RBDPO)油苷。几个参数,如交流击穿电压,介电损耗因子,相对介电常数和电阻率的检测,同时接收和干燥的样品。结果表明,RBDPO和CO的介电损耗系数和电阻率存在差异,经过干燥处理后样品的介电性能均得到改善。
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引用次数: 24
Effect of fault resistance on the behavior of superconducting fault current limiter in power systems 电力系统中故障电阻对超导故障限流器性能的影响
Pub Date : 2014-12-01 DOI: 10.1109/PECON.2014.7062443
D. Mansour
Current limiting behavior of a superconducting fault current limiter (SFCL) depends on the prospective fault current, which in turn depends on fault resistance. Accordingly, this paper introduces a comprehensive study on the effect of fault resistance on the behavior of SFCL in power systems. A model for the system under study and SFCL is developed using PSCAD/EMTDC software. The fault resistance is changed from a very small value (0.5 Ω) to a large value (25 Ω). At each fault resistance, the line currents are obtained with and without using SFCL. It is shown that SFCL effectively reduces prospective fault currents, even at small fault resistances and high fault currents. Furthermore, the percentage limitation is determined as a function of fault resistance. It is demonstrated that SFCL behaves as an adaptive scheme, where its percentage limitation becomes higher at high fault currents. Finally, the current limiting burden of SFCL is evaluated at different fault resistances through the voltage across the SFCL.
超导故障限流器的限流性能取决于预期故障电流,而预期故障电流又取决于故障电阻。因此,本文对电力系统中故障电阻对SFCL性能的影响进行了全面的研究。利用PSCAD/EMTDC软件建立了所研究系统和SFCL的模型。故障电阻值由很小的0.5 Ω变为很大的25 Ω。在每个故障电阻处,使用SFCL和不使用SFCL分别获得线路电流。结果表明,即使在小的故障电阻和大的故障电流下,SFCL也能有效地减小预期故障电流。此外,百分比限制被确定为故障电阻的函数。结果表明,SFCL是一种自适应方案,其百分比限制在高故障电流时变得更高。最后,通过SFCL上的电压,在不同的故障电阻下评估SFCL的限流负荷。
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引用次数: 11
Accurate phase to phase fault resistance calculation using two terminal data 采用两端数据精确计算相对相故障电阻
Pub Date : 2014-12-01 DOI: 10.1109/PECON.2014.7062410
Muhd Hafizi Bin Idris, S. Hardi, M. Z. Hasan, Y. Yatim, S. Hasan
Faults can occurred at the transmission line due to lightning strike, broken conductor, cross arm or tower falls, danger tree, crane or animal encroachment, polluted insulator etc. Each type of fault will represents a fault resistance value. Fault resistance will affects the accuracy of protection relays in fault location and fault zone detection. Phase to phase fault is one type of unsymmetrical fault at the transmission line. This paper represents the accurate way to calculate the actual phase to phase fault resistance value by using data from both local and remote substations. From the finding, the actual fault resistance can be represented by fault resistance as seen from local substation in parallel with the fault resistance as seen from remote substation. To prove the finding, simulation has been carried out and the results show the validity of the proposed theory.
由于雷击、导线断裂、横臂或塔架倒塌、危险树、起重机或动物侵入、绝缘子污染等原因,输电线路可能发生故障。每种类型的故障将表示一个故障电阻值。故障电阻会影响继电保护在故障定位和故障区域检测中的准确性。相相故障是输电线路不对称故障的一种。本文介绍了利用本地和远程变电站的数据准确计算实际相对相故障电阻值的方法。由此发现,实际的故障电阻可以用本地变电站看到的故障电阻与远程变电站看到的故障电阻并联来表示。为了证明这一发现,进行了仿真,结果表明了所提出理论的有效性。
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引用次数: 0
期刊
2014 IEEE International Conference on Power and Energy (PECon)
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