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2012 International Conference on Power, Signals, Controls and Computation最新文献

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A comparative study of sensor and sensor less control of four-switch Inverter fed Permanent Magnet Brushless DC motor 四开关逆变供电永磁无刷直流电动机传感器控制与无传感器控制的比较研究
Pub Date : 2012-04-03 DOI: 10.1109/EPSCICON.2012.6175223
R. Akhila, S. Nikhil
Permanent Magnet Brushless DC (PMBLDC) machines are more popular due to its simple structure and low cost. Improvements in permanent magnetic materials and power electronic devices have resulted in reliable, cost effective PMBLDC drives, for many applications. PMBL motors find applications in diverse fields such as domestic appliances and automobiles due to its low cost and performance. Modelling, simulation and experimentation of drives with new converter configuration and control schemes are essential for making this drive competitive. In this paper, a comparative study between sensor and sensor less control of four-switch Inverter fed PMBLDC is discussed and Simulation model using transfer function of BLDC motor is presented. Hardware implementation is done with DSP processor TMS 320LF2407.
永磁无刷直流电机(PMBLDC)因其结构简单、成本低而受到越来越多的青睐。永磁材料和电力电子器件的改进为许多应用带来了可靠、经济的PMBLDC驱动器。PMBL电机由于其低成本和性能,在家用电器和汽车等各个领域都有应用。建模,仿真和实验与新的转换器配置和控制方案的驱动器是必不可少的,使这个驱动器具有竞争力。本文对四开关逆变供电PMBLDC的传感器控制和无传感器控制进行了对比研究,并建立了基于无刷直流电机传递函数的仿真模型。硬件实现采用DSP处理器tms320lf2407。
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引用次数: 7
A faster 2D technique for the design of combinational digital circuits using Genetic Algorithm 一种利用遗传算法设计组合数字电路的快速二维技术
Pub Date : 2012-04-03 DOI: 10.1109/EPSCICON.2012.6175224
C. K. Vijayakumari, P. Mythili
Combinational digital circuits can be evolved automatically using Genetic Algorithms (GA). Until recently this technique used linear chromosomes and and one dimensional crossover and mutation operators. In this paper, a new method for representing combinational digital circuits as 2 Dimensional (2D) chromosomes and suitable 2D crossover and mutation techniques has been proposed. By using this method, the convergence speed of GA can be increased significantly compared to the conventional methods. Moreover, the 2D representation and crossover operation provides the designer with better visualization of the evolved circuits. In addition to this, a technique to display automatically the evolved circuits has been developed with the help of MATLAB.
组合数字电路可以使用遗传算法(GA)自动进化。直到最近,这项技术还使用线性染色体和一维交叉和突变算子。本文提出了一种将组合数字电路表示为二维染色体的新方法以及相应的二维交叉和突变技术。采用该方法,遗传算法的收敛速度比传统方法有明显提高。此外,二维表示和交叉操作为设计人员提供了更好的可视化进化电路。此外,还利用MATLAB开发了一种自动显示演化电路的技术。
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引用次数: 8
Estimation and elimination of DC component in digital relaying 数字继电器中直流分量的估计与消除
Pub Date : 2012-04-03 DOI: 10.1109/EPSCICON.2012.6175253
K. Venkatesh, K. Swarup
This paper propose a new decaying DC component Estimation algorithm for digital relaying. Fault currents tend to include a DC decaying component. This component decreases the accuracy and speed of the protection relay operation. The proposed algorithm can estimate and eliminate the DC decaying component from fault current signals after one cycle from the fault instant. Also, it can be applied to a conventional discrete Fourier transform to calculate phasor quantities of fault currents in a digital protection relay. In the proposed algorithm, the DC decaying magnitude and time constant are estimated exactly by integrating fault currents during one cycle. The DC decaying component is eliminated by subtracting the DC value at each sampling instant. To verify the performance of the proposed algorithm, we performed a DC component estimation test and distance protection test using PSCAD/EMTDC. The results of the PSCAD/EMTDC simulation showed that the proposed algorithm can estimate DC components exactly from fault currents and can be applied to digital protection relays for phasor extraction.
提出了一种新的数字继电保护中衰减直流分量估计算法。故障电流往往包括直流衰减分量。该元件降低了保护继电器操作的准确性和速度。该算法可以在故障瞬间一个周期后估计并消除故障电流信号中的直流衰减分量。此外,它还可以应用于传统的离散傅里叶变换来计算数字保护继电器中故障电流的相量。该算法通过对一个周期内的故障电流进行积分,准确地估计出直流衰减幅度和时间常数。通过减去每个采样瞬间的直流值来消除直流衰减分量。为了验证所提出算法的性能,我们使用PSCAD/EMTDC进行了直流分量估计测试和距离保护测试。PSCAD/EMTDC仿真结果表明,该算法能准确地从故障电流中估计出直流分量,可用于数字保护继电器相量提取。
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引用次数: 9
Superconducting fault current limiter to mitigate the effect of DC line fault in VSC-HVDC system 超导故障限流器减轻直流-高压直流系统直流线路故障的影响
Pub Date : 2012-04-03 DOI: 10.1109/EPSCICON.2012.6175282
P. Manohar, W. Ahmed
Voltage source converter based HVDC systems involving overhead transmission lines are prone to severe over-voltages during line faults. At present, they find applications only in back to back and/or underground cable transmission, with low power ratings. A conventional HVDC system suppresses the dc fault very well with the controllers and smoothing reactors while the same is not true with voltage source converter based HVDC systems. This necessitates the operation of some kind of protective devices. A superconducting fault current limiter, in this regard, is a possible device which can mitigate the effects of dc line faults. In this work, it is aimed to evaluate the dynamic performance of VSC-HVDC system integrated with a superconducting fault current limiter. The resistive superconducting fault current limiter is modeled in MATLAB and is interfaced with low voltage VSC-HVDC system, in PSCAD/EMTDC environment. The results of analysis for various ac and dc fault conditions are presented.
基于电压源变换器的架空输电系统在线路故障时容易出现严重过电压。目前,它们仅应用于背靠背和/或地下电缆传输,具有低额定功率。传统直流输电系统采用控制器和平滑电抗器能很好地抑制直流故障,而基于电压源变换器的直流输电系统则不能很好地抑制直流故障。这就需要某种保护装置的操作。在这方面,超导故障限流器是一种可能的装置,可以减轻直流线路故障的影响。本研究的目的是评估超导故障限流器集成的vdc - hvdc系统的动态性能。利用MATLAB对电阻式超导故障限流器进行建模,并在PSCAD/EMTDC环境下与低压vdc - hvdc系统接口。给出了各种交流和直流故障条件下的分析结果。
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引用次数: 51
An integrated method for numerical computation of electric field using parametric CAD module 利用参数化CAD模块实现电场数值计算的集成方法
Pub Date : 2012-04-03 DOI: 10.1109/EPSCICON.2012.6175235
A. Baral, A. Lahiri
The purpose of this paper is to discuss on the performance of parametric CAD module that has been developed for illustrating electric field distribution over high voltage (HV) systems having either a 2-dimensional or an axi-symmetric or an asymmetric configuration. The results of the electric field computation that are presented here are for an asymmetric gas insulated system (GIS) configuration. The electric field is computed by indirect boundary element method (BEM).
本文的目的是讨论参数化CAD模块的性能,该模块已开发用于说明具有二维或轴对称或非对称配置的高压(HV)系统上的电场分布。本文给出的电场计算结果适用于非对称气体绝缘系统(GIS)配置。采用间接边界元法(BEM)计算电场。
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引用次数: 0
Modelling and simulation of PV based pumping system for maximum efficiency 以PV为基础的抽水系统的建模和仿真,以获得最大的效率
Pub Date : 2012-04-03 DOI: 10.1109/EPSCICON.2012.6175266
G. Biji
The feasibility of using a solar photovoltaic array to drive water-pumping units for irrigation and drinking water in remote areas, where other sources of power are not available has been demonstrated. Solar energy, being very costly at present, is to be used very judiciously. Hence, it is very important that the SPV (Solar Photovoltaic) modules operate at its maximum power point all the time. As the insolation and temperature vary, the maximum power point of the SPV array also changes. Due to the relative high cost of solar cell, it is very important that maximum power is extracted out of the SCA to minimize the required size of the SCA and hence the cost of the pumping system. The modelling of maximum power point trackers (MPPTs) has become common to the control system of SPV water pumping systems by selecting the converter-chopping ratio of MPPT using ANN. The models are integrated by a simulation program MATLAB.
在没有其他能源的偏远地区,使用太阳能光电阵列驱动抽水装置用于灌溉和饮用水的可行性已经得到证明。目前太阳能非常昂贵,因此必须谨慎使用。因此,SPV(太阳能光伏)模块始终在其最大功率点运行是非常重要的。随着日照和温度的变化,SPV阵列的最大功率点也会发生变化。由于太阳能电池的成本相对较高,从SCA中提取最大的功率以最小化SCA所需的尺寸以及泵送系统的成本是非常重要的。利用人工神经网络选择最大功率点跟踪器的变换器斩波比,对最大功率点跟踪器进行建模,已成为SPV水泵系统控制系统的常用方法。通过MATLAB仿真程序对模型进行集成。
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引用次数: 16
An improved EKF based neural network training algorithm for the identification of chaotic systems driven by time series 一种改进的基于EKF的神经网络训练算法,用于辨识时间序列驱动的混沌系统
Pub Date : 2012-04-03 DOI: 10.1109/EPSCICON.2012.6175233
R. Archana, A. Unnikrishnan, R. Gopikakumari
This paper presents a novel algorithm for nonlinear system identification from a single channel output time series of a chaotic signal. A recurrent neural network(RNN) structure has been designed to represent the non linear system. The neural network weights are estimated using the Extended Kalman Filter(EKF) algorithm, augmented by the Expectation Maximization(EM) algorithm used to derive the initial states and covariance, of the Kalman filter. Rossler chaotic system is used for demonstration of the approach. The simulation results show that the Artificial Neural Network(ANN) trained with EKF algorithm, as outlined above, performs with an appreciably low value of modeling error, and give exact reproduction of the output time series and states, as generated from the dynamical equations. The Lyapunov exponents of the model are calculated, from the state space evolution, which confirms the chaotic behaviour.
本文提出了一种基于单通道混沌信号输出时间序列的非线性系统辨识新算法。设计了一种递归神经网络(RNN)结构来表示非线性系统。利用扩展卡尔曼滤波(EKF)算法估计神经网络权值,并用期望最大化(EM)算法增强神经网络权值,该算法用于导出卡尔曼滤波的初始状态和协方差。用罗斯勒混沌系统对该方法进行了验证。仿真结果表明,如上所述,使用EKF算法训练的人工神经网络(ANN)具有相当低的建模误差值,并且可以精确地再现由动态方程生成的输出时间序列和状态。从状态空间演化的角度计算了模型的Lyapunov指数,证实了混沌行为。
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引用次数: 2
Estimation of daily global solar radiation using temperature, relative humidity and seasons with ANN for Indian stations 利用人工神经网络估算印度站的温度、相对湿度和季节的全球日太阳辐射
Pub Date : 2012-04-03 DOI: 10.1109/EPSCICON.2012.6175254
K. V. S. Rao, B. I. Rani, G. S. Ilango
Global solar radiation (GSR) is an important parameter in the design of photovoltaic systems. An accurate knowledge of the GSR of a location is essential for the efficient design and utilization of photovoltaic systems. The main objective of the paper is to predict the daily GSR under clear sky conditions of any location on a horizontal surface, based on meteorological variables. The various parameters such as earth skin temperature, relative humidity (simply humidity), date and month of the year are used to estimate the daily GSR. In order to consider the effect of each meteorological variable on daily GSR prediction, six combinations of the meteorological parameters are utilized in training the artificial neural network (ANN). Two cases were considered to train the ANN. In one case three years data of Hyderabad and in other case three years data of three cities (total nine years data) namely Hyderabad, Delhi and Mumbai are used. In both the cases, 90 days of Trichy data is used for testing the network. Accuracy was tested with statistical indicators like root mean square error (RMSE), mean absolute percentage error (MAPE) and mean bias error (MBE). It is found that MAPE value is minimum when date, month, temperature and humidity are considered as input variables.
太阳总辐射(GSR)是光伏系统设计中的一个重要参数。准确了解地点的GSR对于光伏系统的有效设计和利用至关重要。本文的主要目的是基于气象变量,预测晴空条件下水平面任意位置的日GSR。利用地表温度、相对湿度(简称湿度)、年月日等参数估算日GSR。为了考虑各气象变量对日GSR预报的影响,采用6种气象参数组合对人工神经网络进行训练。考虑了两种情况来训练人工神经网络。在一种情况下,海得拉巴的三年数据,在另一种情况下,三个城市的三年数据(总共9年数据),即海得拉巴,德里和孟买。在这两种情况下,都使用了90天的复杂数据来测试网络。采用均方根误差(RMSE)、平均绝对百分比误差(MAPE)和平均偏倚误差(MBE)等统计指标对准确性进行检验。研究发现,以日期、月份、温度和湿度为输入变量时,MAPE值最小。
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引用次数: 24
Performance analysis of high dynamic range image watermarking based on quantization index modulation 基于量化指标调制的高动态范围图像水印性能分析
Pub Date : 2012-04-03 DOI: 10.1109/EPSCICON.2012.6175272
K. Shiju, P. Selvi
High dynamic range images represent the radiance of scenes captured by a device or generated by an artificial rendering system. Special types of preprocessing, collectively known as tone-mapping (TM) operators, are needed to adapt HDR images to currently existing displays. Tone-mapped images, although of reduced dynamic range, have high quality and hence are possible targets for misappropriation or misuse by malevolent entities. The watermarking technique that is at the core of the proposed image watermarking is based on the quantization index modulation paradigm and is designed to embed a blindly detectable, one bit watermark in HDR images. The requirements imposed on the watermark encompass imperceptibility, a certain degree of security, and robustness to TM operators. Performance analysis of the proposed system and existing system are done based on noise characteristics, receiver operating characteristics and information embedding capacity.
高动态范围图像表示由设备捕获或由人工渲染系统生成的场景的亮度。特殊类型的预处理,统称为色调映射(TM)操作符,需要使HDR图像适应当前现有的显示。色调映射图像,虽然减少了动态范围,但具有高质量,因此是恶意实体盗用或滥用的可能目标。该水印技术的核心是基于量化指标调制范式的水印技术,其目的是在HDR图像中嵌入盲检测的1位水印。对水印的要求包括对TM运营商的不可感知性、一定程度的安全性和鲁棒性。基于噪声特性、接收机工作特性和信息嵌入容量对所提系统和现有系统进行性能分析。
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引用次数: 5
A Novel Anti phishing framework based on visual cryptography 一种新的基于视觉密码的反网络钓鱼框架
Pub Date : 2012-01-31 DOI: 10.1109/EPSCICON.2012.6175228
D. James, M. Philip
With the advent of internet, various online attacks has been increased and among them the most popular attack is phishing. Phishing is an attempt by an individual or a group to get personal confidential information such as passwords, credit card information from unsuspecting victims for identity theft, financial gain and other fraudulent activities. Fake websites which appear very similar to the original ones are being hosted to achieve this. In this paper we have proposed a new approach named as "A Novel Anti-phishing framework based on visual cryptography "to solve the problem of phishing. Here an image based authentication using Visual Cryptography is implemented. The use of visual cryptography is explored to preserve the privacy of an image captcha by decomposing the original image captcha into two shares (known as sheets) that are stored in separate database servers(one with user and one with server) such that the original image captcha can be revealed only when both are simultaneously available; the individual sheet images do not reveal the identity of the original image captcha. Once the original image captcha is revealed to the user it can be used as the password. Using this website cross verifies its identity and proves that it is a genuine website before the end users.
随着互联网的出现,各种在线攻击不断增加,其中最常见的攻击是网络钓鱼。网络钓鱼是指个人或团体试图从毫无戒心的受害者那里获取个人机密信息,如密码、信用卡信息,以进行身份盗窃、经济利益和其他欺诈活动。看起来与原版网站非常相似的假网站正在被托管以实现这一目标。本文提出了一种“基于视觉密码的新型反网络钓鱼框架”来解决网络钓鱼问题。本文实现了一种基于图像的视觉加密身份验证。通过将原始图像captcha分解为存储在单独的数据库服务器(一个与用户一起,一个与服务器一起)中的两个共享(称为表),探索使用视觉加密来保护图像captcha的隐私,这样原始图像captcha只有在两者同时可用时才能显示;单个表单图像不会显示原始图像验证码的身份。一旦原始图像验证码显示给用户,它就可以用作密码。使用本网站对其身份进行交叉验证,在最终用户面前证明其为正版网站。
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引用次数: 71
期刊
2012 International Conference on Power, Signals, Controls and Computation
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