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2015 International Conference on Circuits, Power and Computing Technologies [ICCPCT-2015]最新文献

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Study of very fast transient overvoltages and mitigation techniques of a gas insulated substation 气体绝缘变电站快速瞬态过电压及缓解技术研究
Nikhil Pathak, T. Bhatti, Ibraheem
The very fast transient overvoltages (VFTOs) generated due to switching operations of gas insulated substations (GIS) are dangerous to the equipments connected to the substations. In special cases these transients may cross the Basic Insulation Level (BIL) of the GIS. In this paper, these transient voltages are investigated at the different sensitive locations of a 400 KV GIS. VFTOs of the GIS are calculated using EMTDC/PSCAD software. Hence, the suppression of the VFTOs is also an important field of interest. The suppression techniques to reduce the VFTOs are also discussed in this paper.
气体绝缘变电站在开关操作过程中产生的快速暂态过电压对与变电站相连的设备是非常危险的。在特殊情况下,这些暂态可能会超过GIS的基本绝缘电平(BIL)。本文研究了400千伏地理信息系统不同敏感位置的暂态电压。利用EMTDC/PSCAD软件计算GIS的vftto。因此,VFTOs的抑制也是一个重要的研究领域。本文还讨论了降低vfto的抑制技术。
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引用次数: 3
A new idea of video coding using discrete sign coding DSC and motion compensation using Haar wavelet 采用离散符号编码DSC和哈尔小波运动补偿的视频编码新思路
S. Nithin, L. Suresh
Haar wavelet is the most tough statistical tool which has stimulated by many developments, mainly in the processing of signal and image. The important property of Haar wavelet is the multi-resolution. The major challenge in this video coding is motion management using HWT. Here we can reduce the expense during the storage of video data's and also reduce the bandwidth. A new method is introduced in this paper and a sub-band coding approach is also used that contains Haar Wavelet Transform (HWT) and it is related to a discrete sign coding known as DSC from wavelet. To avoid the problem created by the lack of invariance alteration, we use motion compensation (MC) technique. The output shows that the PSNR and clarity become good compared to other techniques.
哈尔小波是近年来在信号处理和图像处理方面得到广泛发展的最严格的统计工具。哈尔小波的重要特性是多分辨率。该视频编码的主要挑战是使用HWT进行运动管理。这样既可以减少视频数据存储的开销,又可以减少带宽。本文介绍了一种新的编码方法,并采用了一种包含Haar小波变换(HWT)的子带编码方法,它与小波变换中的离散符号编码DSC有关。为了避免由于不变性改变而产生的问题,我们采用了运动补偿技术。输出表明,与其他技术相比,PSNR和清晰度变得更好。
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引用次数: 1
Content based image retrieval: A past, present and new feature descriptor 基于内容的图像检索:过去、现在和新的特征描述符
Manish K. Shriwas, V. Raut
A Technique used for automatic retrieval of images in a large database that perfectly matches the query image is called as Content Based Image Retrieval (CBIR) system. Image querying refers to the predicament of finding objects that are pertinent to a user inquiry within image databases. The paper discusses the fundamental concept of image retrieval on the basis of features like color, texture, and shape. The system retrieves an image when the similarity between the query image and database images is observed. In the concluding section, we propose a new approach based on texture classification which helps to improve the accuracy and efficiency of CBIR system. The CBIR technology has been used in various applications such as military, industrial area, crime prevention, medical diagnosis, education system etc.
一种在大型数据库中自动检索与查询图像完全匹配的图像的技术被称为基于内容的图像检索(CBIR)系统。图像查询是指在图像数据库中查找与用户查询相关的对象的困境。本文讨论了基于颜色、纹理、形状等特征的图像检索的基本概念。当观察到查询图像与数据库图像之间的相似性时,系统检索图像。在结论部分,我们提出了一种基于纹理分类的新方法,该方法有助于提高CBIR系统的准确性和效率。CBIR技术已广泛应用于军事、工业、预防犯罪、医疗诊断、教育系统等领域。
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引用次数: 16
Comparison of equalization techniques for an MIMO MC-CDMA system MIMO MC-CDMA系统均衡技术的比较
S. Kuzhaloli, K. S. Shaji
This paper presents the comparison of the performance analysis of various equalization techniques involved in an Multiple Input Multiple Output (MIMO) Multi-carrier (MC) Code Division Multiple Access (CDMA) system. Multiple transmitting antennas and multiple receiving antennas are used by this system. Equalization techniques considered for comparison are Zero Forcing (ZF) and Zero Forcing with Successive Interference Cancellation (ZF-SIC). This comparison is simulated for a 2*2, 2*3 and 2*4 MIMO channel and simulation is done using MATLAB software. Bit Error rate is the estimation parameter taken into consideration for determining the efficient equalization technique for an MIMO MC-CDMA system.
本文介绍了多输入多输出(MIMO)多载波(MC)码分多址(CDMA)系统中各种均衡技术的性能分析比较。该系统采用多路发射天线和多路接收天线。考虑比较的均衡技术是零强迫(ZF)和零强迫与连续干扰抵消(ZF- sic)。采用MATLAB软件对2*2、2*3和2*4 MIMO信道进行了仿真比较。误码率是确定MIMO MC-CDMA系统有效均衡技术时要考虑的估计参数。
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引用次数: 2
Modeling and simulation of PWM based sliding mode voltage controller for Boost converter in continuous conduction mode 基于PWM的升压变换器连续导通模式滑模电压控制器的建模与仿真
A. Karthikayini, S. Ramprasath, P. Rameshbabu
SM control is a kind of nonlinear control which has been developed predominantly for the control of variable structure systems. Being a control method it has a high degree of flexibility in its design choices, the SM control method is relatively easy to implement as compared to other nonlinear control methods. The design procedure and mathematical modeling for the Boost Converter has been interpreted. In this paper the sliding coefficient for the controller has been selected based on fulfilling the hitting, existence and stability conditions. The controller equations for the selected bandwidth have been derived and modeled using MATLAB/SIMULINK.
SM控制是一种主要用于变结构系统控制的非线性控制。作为一种在设计选择上具有高度灵活性的控制方法,与其他非线性控制方法相比,SM控制方法相对容易实现。介绍了升压变换器的设计过程和数学模型。在满足碰撞、存在和稳定条件的基础上,选取了控制器的滑动系数。对所选带宽的控制器方程进行了推导,并利用MATLAB/SIMULINK进行了建模。
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引用次数: 2
Closed loop control of full bridge converter with asymmetric PWM 非对称PWM全桥变换器的闭环控制
S. Athira, Aswathy Rajan
This paper introduces a full bridge converter with high step-up voltage gain, which is achieved by using asymmetric pulse width modulation. The soft switching is obtained for the converter with zero-voltage switching across the active switches and the zero-current switching across the output diodes. The zero-voltage switching of the active switches are obtained during turn-on and the zero-current switching of the output diodes are obtained during turn-off. The converter is able to achieve high step-up voltage gain by using relatively less transformer turns ratio. Various simulation results using MATLAB SIMULINK is provided to understand the effectiveness of the circuit.
本文介绍了一种采用非对称脉宽调制实现高升压增益的全桥变换器。通过有源开关的零电压开关和输出二极管的零电流开关,实现了变换器的软开关。在导通时实现有源开关的零电压开关,在关断时实现输出二极管的零电流开关。该变换器能够通过使用相对较小的变压器匝数比实现高升压增益。利用MATLAB SIMULINK给出了各种仿真结果,以了解该电路的有效性。
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引用次数: 0
Design and implementation of anti-theft ATM machine using embedded systems 基于嵌入式系统的ATM机防盗设计与实现
A. Julian
Automated Teller Machines (ATMs) security is the field of study that aims at solutions that provide multiple points of protection against physical and electronic theft from ATMs and protecting their installations. From anti-skimming defend systems to silent indicate systems, integrated ATM video surveillance cameras and ATM monitoring options, security specialists are ready to help the people get more out of the ATM security and ATM loss prevention systems. The implementation is achieved with the use of Machine-to-machine (M2M) communications technology. M2M communications is a topic that has recently attracted much attention It provides real-time monitoring and control without the need for human intervention. The idea of M2M platform suggests new system architecture for positioning and monitoring applications with wider coverage and higher communication efficiency. The aim of the proposed work is to implement a low cost stand-alone Embedded Web Server (EWS) based on ARM11 processor and Linux operating system using Raspberry Pi. It offers a robust networking solution with wide range of application areas over internet. The Web server can be run on an embedded system having limited resources to serve embedded web page to a web browser. The setup is proposed for ATM security, comprising of the modules namely, authentication of shutter lock, web enabled control, sensors and camera control.
自动柜员机(atm)安全是一个研究领域,旨在提供多点保护,防止atm机的物理和电子盗窃,并保护其安装。从防撇脂防御系统到静音指示系统,集成的ATM视频监控摄像头和ATM监控选项,安全专家已经准备好帮助人们从ATM安全和ATM防损系统中获得更多。该系统采用机器对机器(M2M)通信技术实现。M2M通信是近年来备受关注的一个话题,它提供了无需人工干预的实时监测和控制。M2M平台的思想为定位和监控应用提供了新的系统架构,覆盖范围更广,通信效率更高。本文的目标是利用树莓派实现一个基于ARM11处理器和Linux操作系统的低成本独立嵌入式Web服务器(EWS)。它提供了一个强大的网络解决方案,在互联网上具有广泛的应用领域。Web服务器可以在资源有限的嵌入式系统上运行,以向Web浏览器提供嵌入式网页。提出了ATM机安全系统的设计方案,包括快门锁认证、网络控制、传感器和摄像头控制等模块。
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引用次数: 19
Economic emission dispatch by modified imperialistic competition algorithm considering carbon capture power plants 考虑碳捕集电厂的修正帝国竞争算法经济排放调度
Biswa Ranjan Kuanr, Sudipta Das, S. Das, Himanshu Shekhar, Madhavi Lata
With the advent of carbon capture and storage technology (CCS), carbon capture power plant (CCPP) has become a vital part of modern day power systems. However, introduction of CCPPs in power systems has a significant impact on dispatch strategies as CCS consumes energy for their operation though they reduce emission. In this work a Modified Imperialistic Competition Algorithm (MICA) based solution procedure is proposed for solving multi-objective Economic Emission Dispatch problem (EED) in a power system with CCPP. A fuzzy set theory based selection method is adopted for selecting the best compromise solution out of a set of non-dominated Pareto solutions of EED problem. Proposed approach is implemented on a 6-generator test system. Results demonstrate the effects of CCPP on economy and emission of the system and effectiveness of MICA in handling multi-objective non-linear optimization problems.
随着碳捕集与封存技术(CCS)的出现,碳捕集电厂(CCPP)已成为现代电力系统的重要组成部分。然而,在电力系统中引入CCPPs会对调度策略产生重大影响,因为CCS虽然减少了排放,但其运行需要消耗能源。本文提出了一种基于修正帝国主义竞争算法(MICA)的电力系统多目标经济排放调度问题求解方法。采用基于模糊集理论的选择方法,从一组非支配Pareto解中选择最优折衷解。该方法已在一个6发电机测试系统上实现。结果证明了CCPP对系统经济性和排放的影响,以及MICA在处理多目标非线性优化问题中的有效性。
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引用次数: 0
Methodological study of opinion retrieval techniques for Twitter social network Twitter社交网络意见检索技术的方法学研究
Y. Sandeep, V. Sindhura
Twitter has turned into an important source for individuals to collect opinions for making decisions. The expansion of social networks and blogs discloses a set of opportunities in the way data is looked and recovered. Opinion retrieval is the formalization for studying and construing opinions. They are used for data evocation which classifies the people opinions or views related as decisive, pessimistic and pacifistic words. Opinion retrieval exemplifies the techniques and approaches that promise to precisely facilitate the opinion-oriented information seeking techniques that involved computational regimen of opinion or subjectivity in the text. Additionally the best ranking model which covers all features and with high adequacy with a state-of-art for Twitter opinion retrieval technique and it outperforms existing methods significantly.
推特已经成为个人收集意见以做决定的重要来源。社交网络和博客的扩展揭示了数据查看和恢复方式的一系列机会。意见检索是研究和构建意见的形式化形式。它们用于数据唤起,将人们的意见或观点分类为果断,悲观和和平主义的词语。意见检索体现了一种技术和方法,这种技术和方法有望精确地促进涉及文本中意见或主观性的计算方案的以意见为导向的信息搜索技术。此外,最好的排名模型涵盖了所有的特征,并且具有较高的充分性,具有最先进的Twitter意见检索技术,它明显优于现有的方法。
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引用次数: 3
Performance evaluation of single switch high frequency resonant power converter for alternative energy sources 替代能源单开关高频谐振功率变换器的性能评价
S. Soumiah, R. Vengatesh, S. Rajan
This paper investigates the performance evaluation of single switch high frequency resonant power converter for solar energy applications. The proposed resonant power converter integrates a single-switch with Zero-Voltage Switching (ZVS) and Zero-Current Switching (ZCS) by an energy-blocking diode. The converter enhances the energy conversion efficiency with less switching losses using single ended structure by achieving soft switching technique. The converter has been demonstrated under different operating modes with an equivalent circuit. Moreover, this converter is conveniently interfaced with Photo-Voltaic (PV) system for promoting the green energy. The sun radiates more photons which is more sufficient to meet the energy demand. But, solar energy has certain intermittency issues, not shining at night and also during daytime there may be cloudy or rainy weather and partial shadow effects which affects the performance of the system. But, due to this Partial Shading Conditions (PSC) there are multiple peaks and multiple steps in the Power-Voltage (P-V) & Current-Voltage (I-V) characteristics curve respectively. One way to enhance the systems performance is by operating the PV system at its Maximum Power Point (MPP). This can be achieved by incorporating a suitable MPPT control algorithm along with the converter circuit. Here, the Incremental Conductance (I&C) and Particle Swarm Optimization (PSO) algorithms have been developed and simulated under Matlab-simulink environment to track the Global Maximum Power Point (GMPP). The main issue in the Incremental Conductance is, struck with the Local Maximum Point (LMP) and it fails to track the GMPP. The simulated results show that the evolutionary technique based PSO MPPT overcomes the drawbacks of I&C algorithm where it tracks the GMPP effectively. The parameters of the PV module have been obtained from the manufacturer datasheet (MS24250) for these analyses.
本文研究了太阳能用单开关高频谐振功率变换器的性能评价。所提出的谐振功率变换器通过能量阻断二极管集成了零电压开关(ZVS)和零电流开关(ZCS)的单开关。该变换器采用单端结构,实现了软开关技术,以更小的开关损耗提高了能量转换效率。用等效电路演示了该变换器在不同工作模式下的性能。此外,该转换器可方便地与光伏系统接口,以促进绿色能源的发展。太阳放射出更多的光子,这更足以满足能源需求。但是,太阳能有一定的间歇性问题,晚上不发光,白天也可能有多云或下雨的天气和部分阴影影响系统的性能。但是,由于这种部分遮阳条件(PSC),在功率电压(P-V)和电流电压(I-V)特性曲线中分别存在多个峰值和多个步骤。提高系统性能的一种方法是在其最大功率点(MPP)运行光伏系统。这可以通过结合合适的MPPT控制算法以及转换器电路来实现。本文开发了增量电导(I&C)和粒子群优化(PSO)算法,并在Matlab-simulink环境下进行了仿真,用于跟踪全局最大功率点(GMPP)。增量电导的主要问题是,局部最大值点(LMP)被击中,它不能跟踪GMPP。仿真结果表明,基于进化技术的PSO MPPT算法克服了I&C算法有效跟踪GMPP的缺点。这些分析的PV组件参数已从制造商数据表(MS24250)中获得。
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引用次数: 5
期刊
2015 International Conference on Circuits, Power and Computing Technologies [ICCPCT-2015]
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