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2016 2nd International Conference on Electrical, Computer & Telecommunication Engineering (ICECTE)最新文献

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Terminal voltage regulation & output fluctuations minimization using governor-exciter controller 终端电压调节和输出波动最小化使用调速器-励磁器控制器
D. Datta, M. Sheikh, M. M. Islam, A. Mahdi
Energy is essential to life and the major source of energy comes from fossil fuels. As the human population increases, our rate of consumption of these fossil fuels also increases. On the other hand, world population continues to grow and the limited amount of fossil fuels begin to diminish, it may not be possible to provide the amount of energy demanded by the world by only using fossil fuels to convert energy. The solution to the problems of limited fossil fuels and their impact on the environment is to have renewable resources play a larger role in the supply of energy. In this case wind energy is the most promising green energy. As wind turbine output is proportional to the cube of wind speed, the wind turbine generator output fluctuates due to wind speed variation. Thus this paper focuses on the comparative study between conventional wind turbine models with modified pitch controller and proposed a new technique called modified pitch governor with exciter controller to control output voltage and frequency without using any costly energy storage devices. In this study variable load is considered and real wind speed data is taken to obtain realistic response. PSCAD/EMTDC software is used for simulation analyses.
能源是生命所必需的,能源的主要来源来自化石燃料。随着人口的增长,我们对这些化石燃料的消耗量也在增加。另一方面,世界人口持续增长,有限的化石燃料开始减少,仅靠化石燃料转换能源可能无法提供世界所需的能源。解决化石燃料有限及其对环境的影响的办法是使可再生资源在能源供应中发挥更大的作用。在这种情况下,风能是最有前途的绿色能源。由于风力发电机组的输出与风速的立方成正比,因此风力发电机组的输出会随着风速的变化而波动。因此,本文重点对传统的带修正螺距控制器的风力机模型进行了对比研究,提出了一种不使用昂贵的储能装置而实现输出电压和频率控制的新技术——带励磁器控制器的修正螺距调速器。本研究考虑了变荷载,并采用实际风速数据,以获得真实的响应。采用PSCAD/EMTDC软件进行仿真分析。
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引用次数: 0
A comparative study on power converters for PMSG based wind turbine generation system 基于PMSG的风力发电系统功率变流器的比较研究
Md. Akmam Ul Haque, D. Datta, Md. Rafiqul Islam Sheikh
This paper focuses on modeling and simulation of a Permanent Magnet Synchronous Generator (PMSG) based wind turbine with three different types of inverter with the same configuration in its control section. In this research, a Two-Level, Three-Level and a Five-Level inverter has been used in three different simulation program to justify their performance under the same control system and same PMSG system. Based on their performance, corresponding graphical analysis has also been shown. This paper also deals with the both dynamic and transient stability of the system. Proper comparison between these three inverters has been included on the basis of their simulation performance. The performance of the system is verified by proper simulations with PSCAD Professional 4.2.0 and the obtained results are presented with brief graphical analysis.
本文主要研究了一种永磁同步发电机风力发电机组的建模与仿真,该风力发电机组的控制部分采用三种不同类型的相同配置的逆变器。在本研究中,二电平、三电平和五电平逆变器分别在三种不同的仿真程序中使用,以验证它们在相同控制系统和相同PMSG系统下的性能。根据它们的性能,给出了相应的图形分析。本文还讨论了系统的动态稳定性和暂态稳定性。在仿真性能的基础上,对这三种逆变器进行了适当的比较。利用PSCAD Professional 4.2.0软件进行了仿真,验证了系统的性能,并对仿真结果进行了简要的图形化分析。
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引用次数: 2
Improvement of the output performance of CZTS thin film solar cell 提高CZTS薄膜太阳能电池的输出性能
Sudipto Saha, R. Chowdhury, M. Hassan
In this work, 1D simulation has been performed to improve the output performance of CZTS solar cells. Three device parameters: back metal work function, CZTS absorber layer thickness and acceptor doping concentration of the absorber layer have been varied to optimize the overall solar cell performance. It has been found that back metal work function plays the most critical role and Au and Pd gives superior performance when used as back metal contact. Overall the best parameters for achieving high efficiency of a CZTS solar cell is reported.
在这项工作中,进行了一维模拟,以提高CZTS太阳能电池的输出性能。通过改变后金属功函数、CZTS吸收层厚度和吸收层受体掺杂浓度三个器件参数,优化了太阳能电池的整体性能。研究发现,金属背面的功功能起着至关重要的作用,而Au和Pd作为金属背面触点具有优越的性能。总的来说,报道了实现CZTS太阳能电池高效率的最佳参数。
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引用次数: 1
Low voltage ride through capability enhancement of DFIG-based wind turbine by a new topology of fault current limiter 一种新的故障限流器拓扑结构提高dfig型风力发电机的低压穿越能力
Mst Farzana Khatun, M. Sheikh
Due to rapid depletion of fossil fuel and environment concern, clean and non-polluting energy i.e. renewable energy is highly needed. Among the various renewable resources, wind energy is one of the most important and promising sources. In the recent year doubly fed induction generator (DFIG) is one of the most widely used in wind farms. But the transient stability of DFIG becomes very much sensitive and challenging concern. Three phase line-to-ground fault (3LG) is one of the worst cases of DFIG. During fault at grid side, DFIG is much affected because its stator windings are directly connected to grid. So it is important to analyse the transient stability of DFIG during fault according to fulfil the grid code requirement. To improve the transient stability and fault ride through capability of DFIG a new topology of fault current limiter (FCL) is proposed in this paper. The proposed FCL is not only limit the fault current but also faster voltage recovery. Thus improve the transient stability and fulfil the grid code requirements. For simulation analysis, PSCAD/EMTDC software is used. To determine the advantageousness of proposed FCL, its performance is compared with the conventional series dynamic resistor (SDR). Simulation results show that the proposed FCL enhances the transient stability of DFIG and better performance than SDR.
由于化石燃料的迅速枯竭和对环境的关注,人们对清洁无污染的能源即可再生能源的需求越来越大。在各种可再生能源中,风能是最重要和最有前途的能源之一。双馈感应发电机(DFIG)是近年来在风电场中应用最为广泛的发电机之一。但DFIG的暂态稳定性是一个非常敏感和具有挑战性的问题。三相线地故障(3LG)是DFIG中最严重的故障之一。在电网侧发生故障时,DFIG的定子绕组与电网直接相连,对故障影响较大。因此,在满足电网规范要求的前提下,对DFIG故障时的暂态稳定性进行分析具有重要意义。为了提高DFIG的暂态稳定性和故障穿越能力,本文提出了一种新的故障限流器拓扑结构。所提出的FCL不仅能限制故障电流,而且能更快地恢复电压。从而提高暂态稳定性,满足电网规范要求。仿真分析采用PSCAD/EMTDC软件。为了确定FCL的优势,将其性能与传统的串联动态电阻器(SDR)进行了比较。仿真结果表明,FCL提高了DFIG的暂态稳定性,性能优于SDR。
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引用次数: 3
Mitigation of frequency disturbance in power systems during cyber-attack 网络攻击时电力系统频率干扰的缓解
M. Hassan, N. K. Roy, M. Sahabuddin
This article investigates the impact of cyber-attack on a power station in frequency disturbing aspects during sudden changes of load of the system and proposes a solution method to make it stable. Stable limit of the speed regulation for load frequency control (LFC) and integral controller gain for automatic generation control (AGC) is derived from their characteristic equations. Depending upon the nature of cyber-attack (positive biased or negative biased attack) simulations are performed to show the frequency deviations and oscillations of the power system. Finally a feedback LFC block with a three input switch is designed to remove these oscillations.
本文研究了网络攻击在负荷突变时对电站频率干扰方面的影响,并提出了使负荷突变稳定的解决方法。根据负载频率控制(LFC)和自动生成控制(AGC)的特性方程,导出了它们的稳定极限。根据网络攻击的性质(正偏置或负偏置攻击),进行模拟以显示电力系统的频率偏差和振荡。最后,设计了一个带有三输入开关的反馈LFC块来消除这些振荡。
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引用次数: 18
Human iris as a biometric for identity verification 虹膜作为一种生物特征,用于身份验证
Abdul Matin, F. Mahmud, S. T. Zuhori, Barshon Sen
The use of human biometrics for automatic identity verification has become widespread. Mostly used human biometrics are face, fingerprint, iris, gait, retina, voice, hand geometry etc. Among them iris is an externally visible, yet protected organ whose unique epigenetic pattern remains stable throughout one's whole life. These characteristics make it very attractive to use as a biometric for identifying individuals. This paper presents a detailed study of iris recognition technique. It encompasses an analysis of the reliability and the accuracy of iris as a biometric of person identification. The main phases of iris recognition are segmentation, normalization, feature encoding and matching. In this work automatic segmentation is performed using circular Hough transform method. Daugman's rubber sheet model is used in normalization process. Four level phase quantization based 1D Log-Gabor filters are used to encode the unique features of iris into binary template. And finally the Hamming distance is considered to examine the affinity of two templates in matching stage. We have experimented a better recognition result for CASIA-iris-v4 database.
人体生物识别技术在自动身份验证中的应用已经广泛。常用的人体生物识别技术有面部、指纹、虹膜、步态、视网膜、声音、手部几何等。其中虹膜是一种外部可见但受保护的器官,其独特的表观遗传模式在人的一生中保持稳定。这些特征使其成为识别个体的生物特征非常有吸引力。本文对虹膜识别技术进行了详细的研究。它包括虹膜的可靠性和准确性的分析,作为一个生物识别的人的身份。虹膜识别的主要阶段是分割、归一化、特征编码和匹配。在这项工作中,使用圆形霍夫变换方法进行自动分割。归一化过程采用道格曼胶板模型。采用基于四电平相位量化的一维Log-Gabor滤波器对虹膜特征进行编码。最后利用汉明距离来考察两个模板在匹配阶段的亲和力。我们对CASIA-iris-v4数据库进行了较好的识别实验。
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引用次数: 10
Sensitivity analysis of a graphene based surface plasmon resonance biosensor in terms of number of graphene layers 基于石墨烯层数的表面等离子共振生物传感器灵敏度分析
M. M. Bari, A. K. Sarkar, Sakhawat Hossain
This research paper introduces the advantage of using graphene as a sensitivity enhancing material for the Surface Plasmon Resonance (SPR) Biosensor. Fresnel's four layer model has been used here for analyzing the performance parameters of SPR biosensor. The analysis shows that Surface Plasmon Resonance Frequency (SPRF) increases with the increasing concentration of target molecule for every graphene layer. It is found that the sensitivity curve for different graphene layer with respect to conventional SPR biosensor is non-linear. How the sensitivity increases with increasing graphene layer was studied in this work. The basic polynomial fitting is used and found that sensitivity increases nonlinearly with the increasing layers and the degree of nonlinearity also increases.
本文介绍了石墨烯作为表面等离子体共振(SPR)生物传感器灵敏度增强材料的优点。本文采用菲涅耳四层模型对SPR生物传感器的性能参数进行了分析。分析表明,每层石墨烯表面等离子体共振频率(SPRF)随靶分子浓度的增加而增加。发现不同石墨烯层的灵敏度曲线相对于传统的SPR生物传感器是非线性的。研究了石墨烯层数的增加对灵敏度的影响。采用基本多项式拟合,发现灵敏度随层数的增加呈非线性增加,非线性程度也随之增加。
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引用次数: 3
A comparative performance analysis of CdS and In2S3 buffer layer in CIGS solar cell CIGS太阳能电池中CdS和In2S3缓冲层性能的比较分析
Mohammad Sijanur Rahaman Robin, M. Rahaman
Thin-film solar cells (TFSCs) have the potential to reach cost effective photovoltaic generated electricity. Cadmium Sulfide (CdS) and Indium Sulfide (In2S3) buffer layer based Copper Indium Gallium Selenide (CIGS) solar cell offers higher efficiency with low manufacturing cost. Therefore, this paper presents a comparative study between CdS and In2S3 buffer layer based CIGS solar cell. The numerical study has been performed using a Solar Cell Capacitance Simulator named SCAPS-1D. The performance of CIGS solar cell is observed by adjusting the buffer layer thickness of both CdS and In2S3. The efficiency of CdS/CIGS solar cell is found 25.56% that is higher than the efficiency of In2S3/CIGS (24.41%) solar cell for 50 nm buffer layer thickness. It is also found that, the increase in buffer layer thickness from the optimum level degrades the performance of CdS/CIGS solar cell as compared to In2S3/CIGS solar cell. Therefore, In2S3 based CIGS cell could be an ideal candidate as a substitute of toxic CdS buffer layer based CIGS solar cell.
薄膜太阳能电池(TFSCs)有潜力达到具有成本效益的光伏发电。基于硫化镉(CdS)和硫化铟(In2S3)缓冲层的铜铟硒化镓(CIGS)太阳能电池具有较高的效率和较低的制造成本。因此,本文对CdS和基于In2S3缓冲层的CIGS太阳能电池进行了比较研究。利用太阳能电池电容模拟器SCAPS-1D进行了数值研究。通过调整CdS和In2S3的缓冲层厚度,观察了CIGS太阳能电池的性能。当缓冲层厚度为50 nm时,CdS/CIGS太阳能电池的效率为25.56%,高于In2S3/CIGS太阳能电池的效率(24.41%)。研究还发现,与In2S3/CIGS太阳能电池相比,缓冲层厚度从最佳水平增加会降低CdS/CIGS太阳能电池的性能。因此,基于In2S3的CIGS电池可以作为有毒CdS缓冲层的CIGS太阳能电池的理想替代品。
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引用次数: 1
Investigation of low switching frequency control of a three phase cascaded H-bridge multilevel inverter 三相级联h桥多电平逆变器的低开关频率控制研究
M. Hasan, A. Abu‐Siada, Md. Rabiul Islam
This paper presents analysis of a three phase hybrid multilevel inverter (MLI) by applying low frequency stair case control strategy. The proposed MLI contains three cascaded stages, auxiliary stage-1, auxiliary stage-2, and main stage. The main stage contains three half-bridge cells which are connected in parallel with a common DC power supply. Each of the stages in the auxiliary stages consists of three H-bridge where the H-bridge cells contain isolated DC power supplies. The proposed hybrid MLI is tested for symmetric and asymmetric configurations of input voltage sources of the main and auxiliary stages. A scaled down prototype of the proposed hybrid three-phase hybrid MLI is developed to verify the control concept and the real time performance of the inverter.
本文采用低频阶梯控制策略对三相混合多电平逆变器进行了分析。拟议的MLI包括三个级联级,辅助级1、辅助级2和主级。主级包含三个半桥式单元,它们与普通直流电源并联连接。辅助级中的每一级由三个h桥组成,其中h桥单元包含隔离的直流电源。对主级和辅助级输入电压源的对称和非对称配置进行了测试。为了验证所提出的混合三相混合MLI的控制概念和逆变器的实时性能,开发了一个按比例缩小的原型。
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引用次数: 4
Fabrication and characterization of dye-sensitized solar cell using Syzygium cumini dye 染料敏化太阳电池的制备与表征
A. Amin, M. Emran, M. F. Hossain
Dye-Sensitized solar cell (DSSC) has long been regarded as one auspicious choice for the alternative way to convert the solar energy to electric energy. In this work, DSSC has been fabricated using the natural dye extracted from Syzygium cumini fruits. Here, nanocrystalline TiO2 deposited on the fluorine doped tin-oxide (FTO) glass substrate has been used as dye absorber due to their high surface area and it shows high electron mobility, and carbon counter electrode has been used as a back electrode. The performance parameters of the solar cell have been achieved under AM 1.5 illumination. Optical and surface morphological studies of TiO2 film have been observed. The solar cell efficiency of 0.161%, short circuit current density of 0.952 mA/cm2, open circuit voltage of 735 mV and fill factor of 0.230 have been achieved in this study.
染料敏化太阳能电池(Dye-Sensitized solar cell, DSSC)一直被认为是将太阳能转化为电能的一种理想选择。本研究以芫荽果实为原料,提取天然染料制备了DSSC。本文将纳米晶TiO2沉积在氟掺杂锡氧化物(FTO)玻璃基板上,由于其高表面积和高电子迁移率,被用作染料吸收剂,并使用碳对电极作为背电极。在am1.5照度下获得了太阳能电池的性能参数。对TiO2薄膜进行了光学和表面形态学研究。研究结果表明,太阳能电池效率为0.161%,短路电流密度为0.952 mA/cm2,开路电压为735 mV,填充系数为0.230。
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引用次数: 1
期刊
2016 2nd International Conference on Electrical, Computer & Telecommunication Engineering (ICECTE)
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