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2012 International Conference on Emerging Trends in Electrical Engineering and Energy Management (ICETEEEM)最新文献

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Enhancement in the operation of wind turbine based induction generator by using fuzzy logic based direct torque control 基于模糊逻辑的直接转矩控制提高风力发电机的运行性能
D. Ananth
This paper compares fuzzy logic controller with conventional PI controller based direct torque control (DTC) for a wind turbine induction generator set. The voltage controlled gating pulses to inverter are of variable frequency by using carrier based PWM with reference to sinusoidal waveform to achieve desired results. The torque and flux estimation block and speed error control block are the heart for this control system. The analysis is developed by using MATLAB/ SIMULINK. The proposed fuzzy based technique is used to maintain smooth torque transform and maintains desired torque even though there is change in generator speed or vice-versa. The system stability and current extraction can be improved by using FLC than PI controller, even under sudden changes in speed and torque of the machine. The torque ripples were less for both PI and FLC based controller scheme compared to previous techniques. Torque surges due to sudden change in speed of machine can also be minimized by using proposed fuzzy controller scheme. The comparisons of PI with FLC for wind turbine based induction generator were studied under 2 cases, in 1st case, constant generator speed and variable change in wind speed, torque and in the 2nd case, variable speed generator and variable speed of wind.
本文比较了模糊控制器与传统PI控制器在风力发电机组直接转矩控制中的应用。采用基于载波的PWM,参考正弦波形,实现变频压控门控脉冲,达到预期效果。转矩和磁链估计模块和速度误差控制模块是该控制系统的核心。利用MATLAB/ SIMULINK进行分析。所提出的基于模糊的技术用于保持平滑转矩变换,即使发电机转速发生变化也能保持所需转矩,反之亦然。与PI控制器相比,使用FLC控制器可以提高系统的稳定性和电流提取,即使在机器的速度和转矩突然变化的情况下也是如此。与之前的控制方法相比,基于PI和FLC的控制方案的转矩波动较小。提出的模糊控制方案还可以最大限度地减少由于转速突然变化引起的转矩波动。研究了风力发电机组的PI与FLC在恒转速和变风速、变转矩、变转速和变风速两种情况下的比较。
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引用次数: 2
Novel and secure encoding and hiding techniques using image steganography: A survey 基于图像隐写术的新型安全编码和隐藏技术综述
S. Ashwin, J. Ramesh, S. A. Kumar, K. Gunavathi
Steganography is the art of passing information in a manner that the very existence of the message is unknown. The goal of steganography is to avoid drawing suspicion to the transmission of a hidden message. If suspicion is raised, then this goal is defeated. It serves as a better way of securing message than cryptography which only conceals the content of the message not the existence of the message. Original message is being hidden within a carrier such that the changes so occurred in the carrier are not observable. Many different carrier file formats can be used, but digital images are the most popular because of their frequency on the Internet. The recent growth in computational power and technology has propelled it to the forefront of today's security techniques. This paper presents a review of the literature on different types of contemporary steganography techniques for image in spatial and transform domains and steganalysis techniques for the detection of secret message in the image. In addition, research trends and challenges are identified and directions for future research are discussed.
隐写术是一种传递信息的艺术,这种信息的存在是未知的。隐写术的目的是避免引起对隐藏信息传输的怀疑。如果引起怀疑,那么这个目标就失败了。它是一种比加密更好的保护消息的方法,加密只隐藏消息的内容,而不隐藏消息的存在。原始消息被隐藏在一个载体中,这样在载体中发生的变化是不可观察的。可以使用许多不同的载波文件格式,但数字图像是最受欢迎的,因为它们在互联网上的频率很高。最近计算能力和技术的增长将其推向了当今安全技术的前沿。本文综述了不同类型的当代空间域和变换域图像隐写技术以及图像中秘密信息检测的隐写分析技术的文献。此外,还指出了研究趋势和挑战,并对未来的研究方向进行了讨论。
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引用次数: 34
Comparison of five level and seven level cascaded multilevel inverter based dstacom for compensation of harmonics and reactive power using instantaneous real-power theory 基于瞬时实数功率理论的五电平和七电平级联多电平逆变器谐波和无功补偿的比较
M. Reddy, T. Gowrimanohar
The "multilevel converter" has drawn tremendous interest in the power industry. The general structure of the multilevel converter is to synthesize a sinusoidal voltage from several levels of voltages, Multilevel voltage source converters are emerging as a new breed of power converter options for high power applications, These converter topologies can generate high-quality voltage waveforms with power semiconductor switches operating at a frequency near the fundamental. Among the available multilevel converter topologies, the cascaded multilevel converter constitutes a promising alternative, providing a modular design that can be extended to allow a transformer less connection. This paper presents a three-phase, five-level and seven level cascaded multilevel voltage source inverter based active filter for power line conditioning to improve power quality in the distribution network. The active filter compensates both reactive power and harmonic currents drawn by non-linear loads; additionally it facilitates power factor corrections. The compensation process is based on concept of p-q theory. This proposed cascaded five level and seven level active power filter system is validated through MATLAB/SEMULINK Platform.
“多电平变换器”在电力工业中引起了极大的兴趣。多电平变换器的一般结构是从多个电平合成正弦电压,多电平电压源变换器正在成为高功率应用的新型功率变换器选择,这些变换器拓扑结构可以产生高质量的电压波形,功率半导体开关工作在接近基频的频率。在现有的多电平转换器拓扑结构中,级联多电平转换器是一种很有前途的替代方案,它提供了一种模块化设计,可以扩展到允许无变压器连接。本文提出了一种基于有源滤波器的三相、五电平和七电平级联多电平电压源逆变器,用于电力线调节,以改善配电网的电能质量。有源滤波器补偿非线性负载产生的无功功率和谐波电流;此外,它有利于功率因数校正。补偿过程是基于p-q理论的概念。通过MATLAB/SEMULINK平台对所提出的级联五电平和七电平有源电力滤波器系统进行了验证。
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引用次数: 6
Use of point cloud with a low-cost UAV system for 3D mapping 利用点云与低成本无人机系统进行三维制图
A. Ansari
In this contribution it is shown how an UAV system can be built at low costs. The components of the system, the equipment as well as the control software are presented. Furthermore an implemented program for photogrammetric flight planning and its execution are described. The main focus of this contribution is on the generation of 3D point clouds from digital imagery. For this web services and free software solutions are presented which automatically generate 3D point clouds from arbitrary image configurations. Possibilities of georeferencing are described whereas the achieved accuracy has been determined.
在这篇文章中,展示了如何以低成本建造无人机系统。介绍了系统的组成、设备和控制软件。此外,还描述了一个实现的摄影测量飞行规划程序及其执行。这一贡献的主要焦点是从数字图像生成3D点云。为此,提出了从任意图像配置自动生成三维点云的web服务和免费软件解决方案。描述了地理参考的可能性,同时确定了实现的精度。
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引用次数: 5
Simulation of open and closed loop controlled UPFC systems 开闭环控制UPFC系统仿真
B. R. Rajan, S. Sankar, M. Padmarasan, S. Saravanakumar
This paper proposes a new real and reactive power coordination controller for a unified power flow controller (UPFC). UPFC has two converters, one is series converter which controls the transmission line real or reactive power flow and other is the shunt converter which controls the bus voltage or shunt reactive power and DC link capacitor voltage. In steady state, the real power demand of the series converter is supplied by the shunt converter of the UPFC. The need for reactive power coordination controller for UPFC arises from the fact that excessive bus voltage (the bus to which the shunt converter is connected) excursions occur during reactive power transfers. A new reactive power coordination controller has been designed to limit excessive voltage excursions during reactive power transfers.
针对统一潮流控制器(UPFC),提出了一种新的实功与无功协调控制器。UPFC有两个变换器,一个是串联变换器,控制传输线的实际或无功功率流,另一个是并联变换器,控制母线电压或并联无功功率和直流链路电容电压。在稳定状态下,串联变换器的实际功率需求由UPFC的并联变换器提供。UPFC对无功功率协调控制器的需求源于在无功功率传输过程中出现过高的母线电压(并联转换器连接的母线)偏移。设计了一种新的无功协调控制器,以限制无功传输过程中的过电压漂移。
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引用次数: 3
Efficient and reliable lung nodule detection using a neural network based computer aided diagnosis system 基于神经网络的肺结节高效可靠的计算机辅助诊断系统
S. Ashwin, S. A. Kumar, J. Ramesh, K. Gunavathi
The manual examination of histological images like computed tomography (CT) images by physicians is prone to subjectivity and limited intra and inter-surgeon reproducibility, due to its heavy reliance on human interpretation. As result of which, diagnosis of cancer especially in lungs becomes less accurate and unreliable. So, a computer-aided diagnosis (CAD) system, based on artificial intelligence that efficiently detects nodules of any shape and size, is used for diagnosis without human intervention. In this work, we have developed a two stage CAD system in which the first stage involves pre-processing applied for a better quality image to enable higher success rate on detection following which the cancerous nodule region is segmented. The second stage involves artificial neural network (ANN) architecture which is trained using a modified BFGS algorithm. The proposed system was trained, tested, and evaluated specifically on the problem of detecting lung cancer nodules found on CT images to give a positive detection. A significant comparative analysis was done between the proposed method and several existing CAD systems used for lung nodule diagnosis and the proposed method using training-based neural networks prove to provide accuracy of 96.7% and also better specificity; thus, the overall performance of the CAD scheme was improved substantially.
医生手工检查组织图像,如计算机断层扫描(CT)图像,由于严重依赖人工解释,容易出现主观性,并且外科医生内部和外科医生之间的可重复性有限。因此,癌症的诊断,尤其是肺部的癌症,变得不那么准确和不可靠。因此,基于人工智能的计算机辅助诊断(CAD)系统可以有效地检测任何形状和大小的结节,无需人工干预即可进行诊断。在这项工作中,我们开发了一个两阶段的CAD系统,其中第一阶段涉及应用预处理以获得更好质量的图像,以实现更高的检测成功率,随后对癌结节区域进行分割。第二阶段采用改进的BFGS算法训练人工神经网络(ANN)结构。所提出的系统经过训练、测试和评估,专门针对检测CT图像上发现的肺癌结节的问题,以给出阳性检测。将该方法与现有几种用于肺结节诊断的CAD系统进行了重要的比较分析,结果表明,基于训练的神经网络的方法具有96.7%的准确率和更好的特异性;因此,CAD方案的整体性能有了很大的提高。
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引用次数: 40
Study of inter-integrated circuit color sensor with microcontroller 单片机间集成电路颜色传感器的研究
B. Jeeva, J. Babu, M. Chitra
I2C color sensors register items by contrast, true color. True color sensors are based on one of the color models, most commonly the RGB model (red, green, blue). A large percentage of the visible spectrum can be created using these three primary colors. Many color sensors are able to detect more than one color for multiple color sorting applications. Depending on the sophistication of the sensor, it can be programmed to recognize only one color shade or multiple color shades for sorting operations. In this work a device has been made using color sensor module ADJD-S311-CR999 and programmed using visual basic and interfaced with a computer to identify the color and color shades of any object in textile and fabric industrial applications.
I2C颜色传感器通过对比来记录物品的真实颜色。真彩色传感器基于一种颜色模型,最常见的是RGB模型(红、绿、蓝)。使用这三种原色可以产生很大比例的可见光谱。许多颜色传感器能够检测多种颜色,用于多种颜色分类应用。根据传感器的复杂程度,它可以被编程为只识别一种颜色阴影或多种颜色阴影进行分类操作。在这项工作中,使用颜色传感器模块ADJD-S311-CR999制作了一个设备,并使用visual basic编程并与计算机接口,以识别纺织和织物工业应用中任何物体的颜色和色度。
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引用次数: 6
Simulation of D-Statcom with hysteresis current controller for harmonic reduction 带滞回电流控制器的D-Statcom降谐波仿真
L. Dinesh, H. Sesham, V. Manoj
This paper describes a method for controlling the source currents of a distribution system. Nonlinear loads such as traditional diode/thyristor rectifiers with R, L, C loads generate harmonic and reactive current, which leads to poor power factor, low energy efficiency, and harmful disturbance to other appliances. Active Power Filters (APFs) are one of the viable solutions to eliminate the power line harmonic/reactive currents generated by nonlinear loads and improve the power factor. D-Statcom is connected in parallel with the nonlinear loads and functions as current sources to cancel the harmonic/reactive components in the line current so that the current flow into and from the grid is sinusoidal and in phase with the grid voltage. A hysteresis controller is used for tracking error. The actual current tracks the reference current either in the upper band or in the lower band, resulting in an bier eased tracking error. The results are analyzed and presented using Matlab/Simulink software.
本文介绍了一种控制配电系统源电流的方法。具有R、L、C负载的传统二极管/可控硅整流器等非线性负载产生谐波和无功电流,导致功率因数差,能效低,对其他电器造成有害干扰。有源电力滤波器(APFs)是消除非线性负载产生的电力线路谐波/无功电流和提高功率因数的可行解决方案之一。D-Statcom与非线性负载并联,并作为电流源抵消线路电流中的谐波/无功分量,使进出电网的电流呈正弦且与电网电压相一致。采用迟滞控制器控制跟踪误差。实际电流在上带或下带跟踪参考电流,导致更容易的跟踪误差。利用Matlab/Simulink软件对实验结果进行了分析和展示。
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引用次数: 10
Design and implementation of video based occupancy sensing for adaptive lighting applications 自适应照明应用中基于视频的占用感的设计与实现
A. Alva, K. Shailesh, S. Tanuja
Commercial and Industrial lighting constitutes a sizeable portion of energy consumed. It is important to find ways cost-effective ways of utilizing energy consumed as energy prices soar. This project reports work based on video based human occupancy sensing and controlling the lighting level accordingly. Work involves development of human occupancy sensing system in MATLAB and hardware setup to control the lighting level. This proposed system works successfully in a controlled setup, thus proving that effective systems can be developed in future incorporating the proposed system to bring about more efficiency and also saving energy.
商业和工业照明构成了能源消耗的相当大的一部分。在能源价格暴涨的情况下,寻找有效利用能源的方法是非常重要的。本项目报告工作基于基于视频的人的占用传感和控制相应的照明水平。工作包括在MATLAB中开发人体占用传感系统和硬件设置来控制照明水平。该系统在受控设置下成功地工作,从而证明将来可以开发有效的系统,结合所提出的系统来提高效率并节省能源。
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引用次数: 2
Energy optimization for WSN architecture and self test Embedded processor 无线传感器网络架构的能量优化及嵌入式处理器的自检
T. Jackulin, M. Ramya, C. Subashini
Online testing of processors integrated in WSN nodes operates on battery, and battery duration determine the lifetime of the system, this paper proposes an new clustering Embedded systems less resource utilization. Clustering is a new approach to efficiently utilize the energy of sensor nodes, this approach helps to reduce the network traffic as well as resources utilization, we propose a new energy efficient and reliable clustering algorithm called ACTOR DIRECTED CLUSTERING PROTOCOL (ADCP) that increases the life time of network and our simulation results in efficiently deliver data to an actor node with minimum delay, that helps for taking a quick action and control the attack in its initial stage. Actor Directed Clustering protocol (ADCP) algorithm is used for election and maintaining network traffic clustering Technique is modified for WSN, Low power ratio can be achieved. A link life time prediction routing algorithm can be added with the ADCP protocol. Simulation results show that energy savings at processor level are up to 40 % percent.
集成在WSN节点上的处理器的在线测试依赖于电池,而电池的寿命决定了系统的寿命,本文提出了一种新的资源利用率更低的集群嵌入式系统。聚类是一种有效利用传感器节点能量的新方法,这种方法有助于减少网络流量和资源利用率,我们提出了一种新的节能可靠的聚类算法,称为ACTOR定向聚类协议(ADCP),该算法增加了网络的生命周期,并且我们的仿真结果表明,它能以最小的延迟有效地将数据传递给ACTOR节点,有助于采取快速行动并控制攻击的初始阶段。采用参与者定向聚类协议(Actor Directed Clustering protocol, ADCP)算法进行网络流量的选择和维护,改进了WSN的聚类技术,实现了低功耗比。ADCP协议中可以添加链路寿命预测路由算法。仿真结果表明,该方法在处理器级的能耗节省高达40%。
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引用次数: 6
期刊
2012 International Conference on Emerging Trends in Electrical Engineering and Energy Management (ICETEEEM)
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