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

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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
Cut-Off solar charge controller as an alternative towards system efficiency optimization 截止太阳能充电控制器作为系统效率优化的替代方案
Pub Date : 2014-12-01 DOI: 10.1109/PECON.2014.7062448
A. Sabry, Ahmed M. M. Almassri, W. Z. Wan Hasan, M. A. Mohd Radzi, Zainal Abidin Bin Ab Kader, Suhaidi bin Shafie
Based on the concept of optimizing the efficiency of the automated solar system in residential buildings application, this paper proposed a High efficiency solar Cut-Off charge controller as an alternative to the main solar charge controller in most conventional buildings solar system, the idea is to design an electronic circuit with low losses as a compared with the conventional charge controller to be a part of the integrated and automated building solar system, the design has an algorithm based on some environment parameters like sun Irradiance and weather temperature, this algorithm seems to be inversely calculated because its start from the value of full charge battery voltage. A Simulink Matlab simulator is attempted in the simulation phase of this research. The main difference between the method used in the proposed Cut-Off controller and other technique used in the past is that PV array output power is used directly through a bypass MOSFET to charge the battery bank when the voltage of the battery bank at lower level that its maximum while switching on another path when the batteries reaches its full charge value through another MOSFET to transfer this surplus power to what is called as an Auxiliary load ,fans or auxiliary battery used for system ventilation or solar tracking to reduce the ambient temperature for the system components, so adding more improvements on system performance, this would reduce the complexity of the system on one hand and produce a competitive efficiency, low cost and can be easily modified on the other hand.
基于优化自动化太阳能系统在住宅建筑中的应用效率的概念,本文提出了一种高效太阳能截止电荷控制器,作为大多数传统建筑太阳能系统中主太阳能电荷控制器的替代方案,其思想是设计一种与传统电荷控制器相比损耗低的电子电路,作为集成和自动化建筑太阳能系统的一部分。设计有一个基于一些环境参数的算法,比如太阳辐照度和天气温度,这个算法似乎是反计算的,因为它是从电池充满电的电压值开始的。本研究的仿真阶段尝试了Simulink Matlab仿真器。方法之间的主要区别在提议切断控制器和其他技术使用在过去是,光伏阵列输出功率通过旁路MOSFET直接使用充电电池银行当电池的电压在较低水平,其最大同时打开另一个路径,当电池达到满值通过另一个MOSFET转移剩余权力所谓作为辅助负载,风扇或辅助电池用于系统通风或太阳能跟踪来降低系统组件的环境温度,因此增加了系统性能的更多改进,这一方面会降低系统的复杂性,另一方面会产生具有竞争力的效率,低成本,并且可以很容易地修改。
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引用次数: 2
A simple control strategy of a dual-star induction generator for wind power generating applications 风力发电用双星感应发电机的简单控制策略
Pub Date : 2014-12-01 DOI: 10.1109/PECON.2014.7062454
A. Nemmour, L. Louze, M. Boucherma, A. Khezzar
This paper presents a new method for the voltage build-up process of an isolated-loaded dual star induction generator (DSIG) driven by a wind turbine. The machine delivers the active power to the load via two converters connected to a single capacitor on the DC side. During the voltage build-up process, the necessary stator currents references are injected by the converters; they could be calculated from the desired active power which will be sent to the load. This power is determined by the DC-bus voltage regulation, the reactive power which is necessary for the machine magnetization and finally from the six instantaneous voltages induced through the stator DSIG windings. Since the converter/capacitor model is non-linear, a fast and simple control strategy based on the input-output feedback linearization technique is applied to ensure the DC-bus voltage regulation. Computer simulations are provided to verify the validity of the proposed control algorithm.
本文提出了一种风力发电机驱动的隔离负载双星感应发电机(DSIG)电压建立过程的新方法。该机器通过连接到直流侧单个电容器的两个转换器向负载提供有功功率。在电压建立过程中,必要的定子电流参考由变流器注入;它们可以从发送给负载的期望有功功率中计算出来。该功率由直流母线电压调节、机器磁化所需的无功功率以及通过定子DSIG绕组感应的六个瞬时电压决定。由于变换器/电容模型是非线性的,采用一种基于输入输出反馈线性化技术的快速、简单的控制策略来保证直流母线电压的稳压。计算机仿真验证了所提控制算法的有效性。
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引用次数: 0
Predicting power output of photovoltaic systems with solar radiation model 利用太阳辐射模型预测光伏系统的输出功率
Pub Date : 2014-12-01 DOI: 10.1109/PECON.2014.7062461
Sabo Mahmoud Lurwan, N. Mariun, H. Hizam, M. Radzi, A. Zakaria
Predicting of solar resource in general is momentous for preparation of the operations of power plants which transform renewable energies to electricity. In particular, the possibility to predict the solar irradiance (up to one day or even more) can become of significant interest with reference to Grid connected Photovoltaic (PV) Plants, stand alone and hybrid system. In this paper, a MATLAB/SIMULINK simulation based model for predicting hourly solar radiation using modified Hottel's radiation model is presented. The proposed modified Hottel's model makes it possible to predict solar radiation on hourly basis using current values of day type and geography of the location. While predicting power output, the model requires information of the weather forecast of the day to be predicted, some data from solar module datasheet is use and predicted radiation. The predicted results are compared with outdoor data collected by horizontal mount pyranometer at coordinates (2.945N, 101.728E) on 24th, June 2012. The results indicated the proposed model performed well after comparison with field data, having a correlation coefficient of 97%, also recorded 96% and 76% with Hottel's and Ashrae model respectively.
一般来说,太阳能资源的预测对于将可再生能源转化为电能的发电厂的运行准备具有重要意义。特别是,预测太阳辐照度(长达一天或更长时间)的可能性,对于并网光伏电站、独立光伏电站和混合系统来说,可能变得非常重要。本文提出了一种基于MATLAB/SIMULINK仿真的基于改进的hotel辐射模型的逐时太阳辐射预测模型。修改后的酒店模型可以利用当前的日类型和地理位置,以每小时为基础预测太阳辐射。在预测功率输出时,模型需要预测当天的天气预报信息,使用太阳能组件数据表中的部分数据和预测辐射。将预测结果与2012年6月24日在坐标(2.945N, 101.728E)用水平安装式太阳辐射计采集的室外数据进行比较。结果表明,该模型与现场数据的相关系数为97%,与hotel’s和Ashrae模型的相关系数分别为96%和76%。
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引用次数: 10
Examination on the lightning breakdown strength of biodegradable oil under quasi-uniform field 准均匀场下可生物降解油雷电击穿强度的试验研究
Pub Date : 2014-12-01 DOI: 10.1109/PECON.2014.7062406
N. Katim, M. T. Ishak, A. M. Ishak, Y. V. Thein, N. Azis, M. Kadir, J. Jasni, R. Yunus, Z. Yaakub
Among the alternative fluids considered for application in transformers are Palm Oil (PO) and Coconut Oil (CO). Among the important studies that need to be carried out before it can be applied in-service is the lightning impulse performance. This paper presents the experimental work on the lightning impulse breakdown voltage of different PO, CO and Mineral Oil (MO). The PO used in this is the Refined Bleached Deodorized Palm Oil (RBDPO) type. The test was carried out under quasi-uniform field using sphere-sphere electrode configuration with different testing methods (rising-voltage and up-and-down). It was found that the lightning impulse performance for some of RBDPO and CO were comparable to MO.
考虑在变压器中应用的替代流体包括棕榈油(PO)和椰子油(CO)。在其投入使用之前,需要进行的重要研究之一是雷电冲击性能。本文介绍了不同PO、CO和矿物油(MO)的雷击击穿电压的实验工作。其中使用的PO是精制漂白除臭棕榈油(RBDPO)型。在准均匀场下,采用球-球电极结构,采用升压和上下两种不同的测试方法进行测试。结果表明,部分RBDPO和CO的雷电冲击性能与MO相当。
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引用次数: 11
A practical implementation of online computational tool for unbalanced voltage supply detection in induction motor 异步电动机不平衡电压检测在线计算工具的实际实现
Pub Date : 2014-12-01 DOI: 10.1109/PECON.2014.7062420
M. A. Moussa, Y. Maouche, L. Louze, A. Khezzar
This work presents an computational tool of unbalanced voltage supply detection on-line in induction motor. A technique based on Goertzel algorithm has been used to compute the desired component frequency for real time application. The computer algorithm has been implemented in a low cost microcontroller (Arduino). Two successful methods have been used for condition monitoring of induction motors; the first one is based on Park's vector to calculate the negative component of stator's currents; the second one is dealing with vibration analysis to detect twice line frequency component in the induction motor vibration. Experimental results are provided throughout the paper, to underpin the theoretical analysis.
本文提出了一种异步电动机不平衡电压在线检测的计算工具。采用基于Goertzel算法的技术来计算实时应用所需的分量频率。计算机算法已在低成本的微控制器(Arduino)上实现。已有两种成功的方法用于感应电动机的状态监测;第一种是基于帕克矢量计算定子电流的负分量;二是进行振动分析,检测感应电机振动中的二次线频成分。本文提供了实验结果,以支持理论分析。
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引用次数: 6
Hybrid fuzzy-fuzzy controller for PWM-driven induction motor drive pwm驱动感应电机的模糊-模糊混合控制
Pub Date : 2014-12-01 DOI: 10.1109/PECON.2014.7062453
M. Magzoub, N. Saad, R. Ibrahim, M. Maharun, S. Zulkifli
This paper represents a method for the designing and developing of a hybrid fuzzy-fuzzy control (HFFC) scheme to gain control over the speed of an induction motor (IM). The fuzzy frequency control and fuzzy current amplitude control are studied in a closed-loop current amplitude input model for an induction motor. A combination of both controllers forms the hybrid controller. The principle of HFFC is to control the rotor speed during acceleration-deceleration stage using fuzzy frequency controller and during steady-state stage using fuzzy stator current magnitude controller to overcome the drawback of field oriented control (FOC) method. The two features (frequency and current) of FOC are employed to design a scalar controller. The software, MATLAB/Simulink is used for the simulation to determine the performance of the controller. A series of tests has been conducted to study the performance of the controller and the results shown that the controller is more reliable and insensitivity to the parameters of the motor changes as compared to the classical indirect field-oriented control (IFOC).
本文提出了一种用于异步电动机转速控制的模糊-模糊混合控制方案的设计与开发方法。在异步电动机电流幅值闭环输入模型中,研究了模糊频率控制和模糊电流幅值控制。这两种控制器的组合形成混合控制器。HFFC的原理是在加减速阶段使用模糊频率控制器控制转子转速,在稳态阶段使用模糊定子电流大小控制器控制转子转速,以克服磁场定向控制方法的缺点。利用FOC的两个特性(频率和电流)设计标量控制器。利用MATLAB/Simulink软件进行仿真,确定控制器的性能。通过一系列试验研究了该控制器的性能,结果表明,与传统的间接磁场定向控制(IFOC)相比,该控制器具有更高的可靠性和对电机参数变化的不敏感性。
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引用次数: 2
Corona discharges under various types of electrodes 不同类型电极下的电晕放电
Pub Date : 2014-12-01 DOI: 10.1109/PECON.2014.7062403
G. Altamimi, H. Illias, N. Mokhtar, H. Mokhlis, A. Bakar
Partial discharge (PD) is the most unwanted phenomenon in high voltage insulation system. One of the wellknown types of PD in high voltage insulation is corona discharge. In this work, the characteristics of corona discharges from different types of electrodes (sharp, flat and sphere electrodes) were studied to enhance the understanding of corona discharges. The electrical field distribution for all types of the electrodes was also simulated to study the influence of the field on the PD characteristics. The results show that the characteristics of corona discharges and its electric field distribution are heavily influenced by the shape of the electrodes under high voltage stress.
局部放电是高压绝缘系统中最不希望出现的现象。电晕放电是高压绝缘中常见的局部放电类型之一。本文研究了不同类型电极(尖电极、平电极和球形电极)的电晕放电特性,以加深对电晕放电的认识。模拟了各类型电极的电场分布,研究了电场对局部放电特性的影响。结果表明,在高压应力作用下,电极形状对电晕放电特性及其电场分布有很大影响。
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引用次数: 13
Diagnosis of static eccentricity fault in line start permanent magnet synchronous motor 永磁同步电动机在线起动静态偏心故障的诊断
Pub Date : 2014-12-01 DOI: 10.1109/PECON.2014.7062418
M. Karami, N. Mariun, M. R. Mehrjou, M. A. Ab. Kadir, N. Misron, M. A. Mohd Radzi
In this paper, finite element method is employed for diagnosis of static eccentricity in line start permanent magnet synchronous motor. The motor is modeled with different degrees of eccentricity. Stator current spectrum of healthy and faulty motor are analyzed using power spectral density technique. Amplitudes of harmonic components around fundamental frequency in stator current spectrum are proposed for static eccentricity detection in this type of motor.
本文采用有限元法对直线起动永磁同步电动机的静偏心进行了诊断。电机采用不同的偏心度进行建模。采用功率谱密度技术对正常和故障电机定子电流谱进行了分析。提出了定子电流谱中基频附近谐波分量的幅值,用于该类型电机的静态偏心检测。
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引用次数: 10
期刊
2014 IEEE International Conference on Power and Energy (PECon)
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