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2016 2nd International Conference on Control, Instrumentation, Energy & Communication (CIEC)最新文献

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A novel scheme for Bengali handwriting recognition based on morphological operations with adaptive auto-generated structuring elements 一种基于自适应自动生成结构元素的形态操作的孟加拉文手写识别新方案
Priyanka Das, Tanmoy Dasgupta, S. Bhattacharya
This paper proposes a novel scheme for recognising Bengali handwritten numerals using mathematical morphology. The numerals are broadly classified into two groups based on the presence and position of blobs and stems in them. Since different writing styles are used by different persons, morphological operations with the same structuring elements (SEs) do not yield satisfactory result. Thus, this paper proposes a scheme for automatic generation of SEs based on common handwriting styles. Also the SEs are scaled automatically according to the size of the handwritten digits in order to make the algorithm more robust and efficient. Since, this method does not require any kind of `learning' to work, it is considerably faster than other machine learning based algorithms. Also, it does not require training samples. The present algorithm is tested on a large database of Bengali handwritten digits and its performance and accuracy are also determined.
本文提出了一种利用数学形态学识别孟加拉手写数字的新方案。根据数字中斑点和茎的存在和位置,数字大致分为两组。由于不同的人使用不同的写作风格,相同的结构元素(SEs)的形态操作不能产生令人满意的结果。因此,本文提出了一种基于常用手写样式的se自动生成方案。此外,为了提高算法的鲁棒性和效率,还根据手写数字的大小自动缩放se。由于这种方法不需要任何形式的“学习”,因此它比其他基于机器学习的算法要快得多。此外,它不需要训练样本。在一个大型孟加拉手写体数字数据库上对该算法进行了测试,并对算法的性能和准确率进行了测试。
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引用次数: 7
Effect of X/R ratio on low voltage distribution system connected with constant speed wind turbine X/R比对与恒速风力机连接的低压配电系统的影响
Tathagata Sarkar, Anjan Kumar Dan, Saikat Ghosh
In India, most of the microgrids consist of wind energy sources which are located in rural areas to mitigate the energy deficiency and where the grid is weak in nature. The grid architecture of urban India is ring type where in rural side it is mostly radial is nature. In radial topology, power source is located in one point of the distribution line and the loads are connected to the other ends. The power normally distributed from point of common coupling (PCC) to the receiving end bus. Due to this kind of architecture of the rural grid, the short circuit capacity (SCC) of the line becomes very low and grid impedance becomes very high. Due to these inherent features, the rural grid is weak in nature and it is called weak distribution grid. The main difficulty to connect wind turbines to a weak grid is the voltage and frequency instability. The X/R ratio of the distribution network plays an important role to determine the health of the grid i.e. whether it is weak or strong. A limiting value of the bus voltage can also be investigated by which the injection of active and reactive power from wind turbine can be restricted to the grid for maintaining the voltage stability at PCC. In this paper a wind generator connected with low voltage distribution system has been simulated in PSCAD/EMTDC software to observe the different grid parameters such as voltage, active and reactive power against line X/R ratio to find out the limiting condition of voltage for strong and weak grid.
在印度,大多数微电网由风能组成,这些风能位于农村地区,以缓解能源短缺和电网性质薄弱的情况。印度城市的网格结构是环形的,而农村的网格结构大多是径向的。在径向拓扑中,电源位于配电线路的一端,负载连接在配电线路的另一端。从共耦合点(PCC)到接收端总线的正态分布的功率。由于农村电网的这种结构,线路的短路容量(SCC)变得非常低,而电网阻抗变得非常高。由于这些固有的特点,农村电网本质上是弱的,被称为弱配电网。将风力涡轮机连接到弱电网的主要困难是电压和频率不稳定。配电网的X/R比率对电网的健康状况起着重要的决定作用,即它是弱还是强。还可以研究母线电压的限制值,通过该限制值可以限制风力发电机向电网注入有功和无功功率,以保持PCC的电压稳定。本文利用PSCAD/EMTDC软件对一台与低压配电系统连接的风力发电机进行仿真,观察不同电网电压、有功功率、无功功率等参数对线路X/R比的影响,找出强弱电网电压的极限条件。
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引用次数: 12
Reliability of convergence metric and hypervolume indicator for many-objective optimization 多目标优化中收敛度量和超大体积指标的可靠性
Monalisa Pal, S. Bandyopadhyay
With the emergence and growth of Many-Objective Optimization algorithms, there has been an increased necessity to formulate new metrics that can perform quantitative assessment of the Pareto-Front returned as a solution from a Many-Objective Optimization algorithm. Out of the many evaluation metrics in use, convergence metric and hypervolume indicator have gained immense attention. This paper demonstrates how optimality obtained with respect to one or both of these metrics can be misleading at times. The demonstration is done in two-dimensional scenarios which suggests that the disadvantages of these metrics can be more pronounced when the applications are in higher dimensional space which not only has scalability issues but also where visualization of the space is not feasible. The paper is concluded stating the need for efficient evaluation metric which will accumulate information from the Pareto-Front in terms of convergence, diversity, number of solution (discarding outliers) and shape of the surface.
随着多目标优化算法的出现和发展,越来越有必要制定新的指标,以对多目标优化算法返回的Pareto-Front进行定量评估。在目前使用的众多评价指标中,收敛指标和超大容量指标受到了极大的关注。本文演示了这些指标中一个或两个指标的最优性有时是如何产生误导的。该演示是在二维场景中完成的,这表明当应用程序处于高维空间时,这些指标的缺点会更加明显,因为高维空间不仅存在可伸缩性问题,而且空间的可视化也不可行。最后指出需要一种有效的评价指标,该指标能够从Pareto-Front的收敛性、多样性、解的数量(丢弃异常值)和曲面的形状等方面积累信息。
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引用次数: 8
Steady state and transient stability analysis of wind energy system 风电系统稳态与暂态稳定性分析
Ashwini M. Patil, A. Thosar
The stochastic nature of the wind causes various mechanical and electrical faults. It results the fluctuations in the output power. The high turbulence causes the dynamic loading of the drive train. To investigate the performance of the wind energy system its steady state and transient stability must be studied. This paper discuses the mathematical modeling of the wind energy system. With increase in size of wind turbines the shaft stiffness, viscous friction coefficient, drive train gear ratio and generator inertia constant have influence on the transient response of wind energy systems. The steady state and transient stability analysis with pole-zero study has been done by considering these four parameters. The severity of faults is studied in detail. This study intends the designing of fault tolerant control system in future.
风的随机性会导致各种机械和电气故障。它会导致输出功率的波动。高湍流度引起传动系统的动负荷。为了研究风能系统的性能,必须对其稳态和暂态稳定性进行研究。本文讨论了风能系统的数学建模问题。随着风力发电机组尺寸的增大,轴刚度、粘性摩擦系数、传动系传动比和发电机惯性常数对风力发电系统的瞬态响应有较大影响。考虑这四个参数,进行了稳态和暂态稳定分析。详细研究了断层的严重程度。本研究为今后设计容错控制系统打下了基础。
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引用次数: 7
An automated SCADA based system for identification of induction motor bearing fault used in process control operation 基于SCADA的异步电机过程控制故障自动识别系统
S. Mitra, C. Koley
Current paper proposes a system for identifying bearing faults of a 3-phase induction motor operated in process control application along with the presence of other source of vibration, in the same process. Different types of bearing fault identification techniques have been discussed in literature with the analysis of time domain, frequency domain and time-frequency domain based features. The proposed methods were examined under laboratorial set-up keeping rotating speed and or load variation remains unchanged. And the practical situations of external vibrational effect and noises from various sources of process plant also have not been considered in a vast way. This paper delivers a brief idea of the identification of bearing faulty harmonics which are collected by accelerometer during running condition under random variation of both, speed and load of the motor with the presence of non-stationary external vibrations. The study also revealed that, faulty bearing can be identified from the vibration signal, by programming the PLC based system to collect vibration data only when process enters into some predefined situation, and thereafter by analyzing the vibration amplitude using standard deviation the faulty bearing can be identified.
本文提出了一种过程控制应用中三相异步电动机轴承故障识别系统,该系统在同一过程中存在其他振动源。文献中讨论了不同类型的轴承故障识别技术,分析了基于时域、频域和时频域的特征。所提出的方法在实验室设置下进行了测试,保持转速和负载变化不变。而工艺装置的外部振动效应和各种噪声源的实际情况也没有得到广泛的考虑。本文简要介绍了在电机转速和负载随机变化、外部振动不稳定的情况下,加速度计采集的轴承故障谐波的识别方法。研究还表明,故障轴承可以从振动信号中识别出来,通过编程基于PLC的系统,只有当过程进入预定状态时才采集振动数据,然后使用标准差分析振动幅值来识别故障轴承。
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引用次数: 8
Synchronization of two chaotic coronary artery systems using modified feedback method 基于改进反馈方法的两混沌冠状动脉系统同步
Partha Roy, Susanta Ray, S. Bhattacharya
Periodically excited coronary artery system is a nonlinear system with rich dynamic approach. In this work the chaotic behavior of nonlinear coronary artery system and the synchronization of two coronary artery systems are studied. The chaotic behavior plays a vital role on the controllability and synchronization of the coronary artery systems. The designed controller is to synchronize two nonlinear chaotic coronary artery systems. The dynamics of the controller guaranties global stability. The simulation results justify the feasibility of the controller. The controller is simple enough to implement in a simple hardware.
周期性激发冠状动脉系统是一个具有丰富动力学方法的非线性系统。本文研究了非线性冠状动脉系统的混沌行为和两个冠状动脉系统的同步。混沌行为对冠状动脉系统的可控性和同步性起着至关重要的作用。所设计的控制器用于同步两个非线性混沌冠状动脉系统。控制器的动力学保证了全局稳定性。仿真结果验证了该控制器的可行性。该控制器非常简单,可以在简单的硬件中实现。
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引用次数: 4
Effect of Matrix Converter on the speed control scheme of a grid connected Doubly-Fed induction generator system 矩阵变换器对并网双馈感应发电机系统转速控制方案的影响
A. Basak, K. Mukherjee, P. Syam
Matrix Converter (MC) is a kind of solid state direct frequency changer without any additional large reactive elements. The paper discusses the effect of this MC on a speed control system of a Doubly Fed Induction Generator (DFIG) connected to a grid where the rotor side voltage is controlled using it. The modulation of matrix converter is based on Space vector modulation with indirect transfer function (ITF) approach. Advantages as well as limitations with this MC are discussed in details. The effect on the control signals derived from the rotor terminal quantities is illustrated with relevant waveforms. Finally it is concluded that the control system can operate satisfactorily although the control signals contain small magnitudes of high frequency distortion components.
矩阵变换器(MC)是一种不需要任何额外的大型无功元件的固态直接变频器。本文讨论了该MC对并网双馈感应发电机(DFIG)转速控制系统的影响,并利用该MC控制转子侧电压。矩阵变换器的调制是基于间接传递函数(ITF)方法的空间矢量调制。详细讨论了该MC的优点和局限性。用相应的波形说明了转子端子量对控制信号的影响。最后得出结论,尽管控制信号中含有小幅度的高频失真分量,但控制系统仍能令人满意地运行。
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引用次数: 2
Study of a modified IR defusing surface as a uniform source and its application as non-contact level sensor 一种改进型红外消光面作为均匀源及其在非接触式液位传感器中的应用研究
S. Chakraborty, N. Mandal, S. C. Bera
Defusing light is the light reflection from a non uniform surface so that after reflection the light rays can move in different directions. Defusing light with uniform intensity in all direction is very important in various applications. In the present paper, design of a modified defusing surface for uniform IR light has been studied and the effect of new base plate material that surface on intensity of diffused IR light has been observed. Application of this modified diffusing surface in developing a non contact level sensor using float as the sensing element has also been observed as in [8]. Mathematical equations explaining the principle of operation of the sensor are identical to those in [8] and are applied in the present work. The sensor with the modified defusing surface has been experimentally studied. Experimental results almost identical to those in [8] are reporter in the paper.
消光是从非均匀表面反射的光,反射后光线可以向不同方向移动。在各种应用中,在各个方向上具有均匀强度的光散射是非常重要的。本文研究了一种改进型均匀红外光消光表面的设计,并观察了该表面的新型基片材料对红外光散射强度的影响。这种改进的扩散表面在开发以浮子为传感元件的非接触式液位传感器中的应用也被观察到,如在[8]中。解释传感器工作原理的数学方程与[8]中的相同,并应用于本工作。实验研究了改进型消熔面传感器。实验结果与[8]基本一致。
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引用次数: 0
A new RBFN with modified optimal clustering algorithm for clear and occluded fingerprint identification 基于改进最优聚类算法的RBFN识别清晰和遮挡指纹
Sumana Kundu, G. Sarker
In this present paper, a Radial Basis Function Network (RBFN) based on Modified Optimal Clustering Algorithm (MOCA) have been developed for clear and occluded fingerprint identification. Unlike conventional OCA technique which only considers intra cluster similarity for performing the desired number of clusters, MOCA combines both intra and inter cluster similarity while grouping such that not only the desired numbers of clusters or groups are formed, but also no misclassification is formed within any group. The approach of using MOCA within Modified RBFN for performing learning and identification of the different fingerprints is effective and efficient. Also the performance evaluation with accuracy, precision, recall and F-score of the classifier are quiet high and the learning time of fingerprints are quite low.
本文提出了一种基于改进最优聚类算法(MOCA)的径向基函数网络(RBFN),用于清晰和遮挡的指纹识别。与传统的OCA技术只考虑簇内相似度来实现期望的簇数不同,MOCA在分组时结合了簇内和簇间相似度,这样不仅形成了期望的簇或组数,而且在任何组内都不会形成错误分类。在改进的RBFN中使用MOCA对不同指纹进行学习和识别的方法是有效的。分类器的准确率、精密度、查全率和f分的性能评价较高,指纹学习时间较短。
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引用次数: 3
Performance analysis of a three-phase SISFCL with the variation of circuit parameters using jiles atherton hysteresis model 利用jiles atherton滞回模型分析三相SISFCL随电路参数变化的性能
A. Upadhyaya, D. Sarkar, A. B. Choudhury, D. Roy
In modern electrical power systems, Saturated Iron-Core Superconducting Fault Current Limiters (SISFCL) are becoming ever popular on account of their ability to instantaneously and reliably detect and limit the high magnitude fault current caused by short circuit faults. The SISFCL accomplishes this by altering the magnetic state of its ferromagnetic core material between saturation and unsaturation, thereby producing low impedance during normal operation and high impedance during faulted condition. In this paper, the mathematical model of a three-phase SISFCL is simulated using numerical methods in the MATLAB software environment. The effect of magnetic hysteresis of the core material is incorporated in the simulation via the Jiles-Atherton hysteresis model. The performance of the SISFCL is analysed against variations of the different circuit parameters namely, the fault resistance, DC bias current, number of turns of the AC and DC coil winding.
在现代电力系统中,饱和铁芯超导故障限流器(SISFCL)由于能够实时、可靠地检测和限制短路故障引起的大量级故障电流而受到越来越多的关注。SISFCL通过改变铁磁磁芯材料在饱和和不饱和之间的磁性状态来实现这一点,从而在正常工作时产生低阻抗,在故障状态时产生高阻抗。本文在MATLAB软件环境下,采用数值方法对三相SISFCL的数学模型进行了仿真。通过Jiles-Atherton磁滞模型将磁芯材料的磁滞效应纳入仿真。根据不同的电路参数,即故障电阻、直流偏置电流、交直流线圈绕组匝数的变化,分析了SISFCL的性能。
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引用次数: 4
期刊
2016 2nd International Conference on Control, Instrumentation, Energy & Communication (CIEC)
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