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

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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
Design and development of an 8 bit microcontroller based space vector PWM inverter fed volt/Hz induction motor drive 基于8位单片机的空间矢量PWM逆变器馈入电压/Hz感应电机驱动的设计与开发
S. Datta, A. Chandra, S. Chowdhuri
Space vector PWM Inverter fed volt/Hz induction motor drives are well accepted for many industrial applications. There are numbers of work, reported in literature on implementation of space vector PWM technique using DSP, FPGA and high-end 16-bit microcontrollers. But the use of costly resources restricts their application in industrial fan, blower, air-condition & ventilation system etc. In this work a state-of-the-art algorithm has been developed to implement Space vector PWM technique for Volt/Hz induction motor drive using a popular 8-bit microcontroller to reduce the overall cost and complexity of the drive. The possible limitations of the controller have been conquered by implementing innovative ideas and techniques for calculation of switching time and selection of switching states. The execution time of the program is also reduced by developing a special algorithm for division, multiplication and `sin' function involved in the calculations. A prototype has been developed to test the effectiveness of the algorithm and satisfactory responses are found.
空间矢量PWM逆变器馈入伏特/赫兹感应电机驱动器在许多工业应用中被广泛接受。文献中报道了使用DSP、FPGA和高端16位微控制器实现空间矢量PWM技术的大量工作。但由于资源昂贵,限制了其在工业风机、鼓风机、空调通风系统等方面的应用。在这项工作中,已经开发了一种最先进的算法,使用流行的8位微控制器来实现伏特/赫兹感应电机驱动的空间矢量PWM技术,以降低驱动器的总体成本和复杂性。控制器的可能的局限性已经被实现的创新思想和技术的计算切换时间和切换状态的选择被征服。通过对计算中涉及的除法、乘法和“sin”函数开发一种特殊的算法,减少了程序的执行时间。开发了一个原型来测试该算法的有效性,并得到了满意的响应。
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引用次数: 7
Development and simulation of dynamic conductance based wattage-independent Compact Fluorescent Lamp model in high frequency environment 高频环境下基于动态电导的功率无关型紧凑型荧光灯模型的开发与仿真
B. G. Bakshi, B. Roy
This paper presents Simulink simulation of a dynamic conductance based wattage independent Compact Fluorescent Lamp (CFL) model in high frequency environment. In this context, the wattage independent model is developed by modifying the existing dynamic conductance model: the model coefficients are replaced by four polynomial equations derived from experimental data. After validating the developed wattage independent lamp model at low frequency (50 Hz), the electrical characteristics of the same model is simulated at high frequency (30 kHz) environment. Here the lamp is driven by electronic ballast consisting of half bridge inverter. Simulation results explore the applicability of the same wattage independent lamp model in both low (50Hz) and high (30 kHz) frequency operation and may be used for ballast design.
本文采用Simulink对高频环境下基于电导的功率无关型紧凑型荧光灯(CFL)模型进行了动态仿真。在这种情况下,通过修改现有的动态电导模型,建立了与功率无关的模型:将模型系数替换为由实验数据导出的四个多项式方程。在验证了所开发的功率无关灯模型在低频(50 Hz)下的电特性后,对相同模型在高频(30 kHz)环境下的电特性进行了仿真。这里的灯是由半桥逆变器组成的电子镇流器驱动的。仿真结果探讨了相同瓦数独立灯模型在低(50Hz)和高(30khz)频率工作中的适用性,并可用于镇流器设计。
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引用次数: 2
Detecting the origin of multifractality of EEG signals with sleep apnea syndrome using multifractal detrended fluctuation analysis method 利用多重分形去趋势波动分析方法检测睡眠呼吸暂停综合征脑电图信号的多重分形来源
M. Chakraborty, T. Das, D. Ghosh
In this paper we try to evaluate the multifractality displayed by the EEG signals obtained from subjects with sleep apnea syndrome. The Multifractal Detrended Fluctuation Analysis (MF-DFA) shows that the EEG signals have different degree of multifractality and we suspected this variety is due to various stages of sleep. In an attempt to identify the origin of multifractality we extend our study and produce surrogate data set. Applying MF-DFA method on the surrogate data set we find that this multifractality is caused by both the long-range correlation appearing due to large and small fluctuations and broad probability distribution. However the first one has more influence on the multifractality of the EEG signals during sleep.
本文试图评价睡眠呼吸暂停综合征患者脑电图信号所显示的多重分形。多重分形去趋势波动分析(MF-DFA)表明,脑电信号具有不同程度的多重分形,我们怀疑这种变化是由于不同的睡眠阶段造成的。为了确定多重分形的起源,我们扩展了我们的研究并产生了替代数据集。利用MF-DFA方法对代理数据集进行分析,发现这种多重分形是由大大小小的波动和较宽的概率分布引起的。而前者对睡眠时脑电信号的多重分形影响更大。
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引用次数: 3
KNN based fault diagnosis system for induction motor 基于KNN的异步电动机故障诊断系统
S. Samanta, J. Bera, G. Sarkar
The paper deals with an online fault diagnosis system of 3-Φ induction motor with sequence component analysis. The fault diagnosis system uses only time synchronized three phase stator voltage and current samples, from which the positive and negative sequence components have been calculated using Sample Shifting Technique (SST). With the objectives to detect the type of fault, fault severity and faulty phase using sequence components analysis. The computational technique like K-nearest neighbor algorithm has been utilized to enhance the accuracy in diagnosis of faulty phase and the severity of fault. The severity information will definitely help to make a machine maintenance schedule and accordingly plant shut down can be made minimum.
本文用序列分量分析法研究了3-Φ异步电动机在线故障诊断系统。故障诊断系统仅使用时间同步的三相定子电压和电流样本,利用样本移位技术(SST)计算正负序分量。目的是利用序列分量分析法检测故障类型、故障严重程度和故障相位。利用k近邻算法等计算技术提高了故障相位诊断的准确性和故障的严重程度。严重程度信息肯定有助于制定机器维护计划,从而使工厂停机时间降至最低。
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引用次数: 11
Automation of an optical frequency standard experiment 光学频率标准实验的自动化
N. Batra, A. Roy, C. Samal, S. Majhi, S. Panja, S. De
We are developing the first optical frequency standard in India with single ytterbium ion (171Yb+), which is confined and laser cooled in an ion trap. This precision clock experiment needs to be automated for running it reliably and continuously over few days. For this we are developing a computer control systems. Some of its supporting hardware modules have already been designed and tested. In this article we describe scheme of our automation and control system.
我们正在开发印度第一个单镱离子(171Yb+)的光学频率标准,该标准在离子阱中被限制和激光冷却。这个精密时钟实验需要自动化,以便在几天内可靠地连续运行。为此,我们正在研制一种计算机控制系统。它的一些支持硬件模块已经设计和测试。本文介绍了我们的自动化控制系统的方案。
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引用次数: 3
An application of complex network in allocation of distributed generation in distribution network 复杂网络在配电网分布式发电分配中的应用
Tamalika Chowdhury, C. K. Chanda, Atri Bera
The application of complex networks have significantly advanced in the last decade and brought about valuable insights to properties of real world systems by evaluating their structure, topology and construction. Power grid is one such real world network in which a technique of analyzing the location of a distributed generation in a distribution system of a grid has been applied based on complex network theory. The metric of electrical centrality is the approach used in differentiating the physical and electrical topological structure of the chosen network. Z-bus matrix represents the more electrically central nodes and it has been found out directly by the formulation of the Z-bus algorithm as it is more practical for larger systems. The results were obtained for 33-bus distribution system from which the locations of the DGs to be placed were found out. This complex network theory based method improves the voltage profile of the system significantly. By placement of one or more DGs in these electrically central nodes, the losses have also been optimized.
在过去的十年中,复杂网络的应用取得了显著的进展,并通过评估其结构,拓扑和构造,为现实世界系统的特性带来了有价值的见解。电网就是这样一个现实世界的网络,基于复杂网络理论的分布式发电在电网配电系统中的位置分析技术已经得到了应用。电中心性度量是用来区分所选网络的物理和电拓扑结构的方法。Z-bus矩阵表示更多的电中心节点,这是由Z-bus算法的公式直接发现的,因为它对更大的系统更实用。以33母线配电系统为例,得出了待放置dg的位置。这种基于复杂网络理论的方法显著改善了系统的电压分布。通过在这些电中心节点中放置一个或多个dg,损耗也得到了优化。
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引用次数: 2
A single stage power factor correction converter for high voltage power and frequency applications 用于高压功率和频率应用的单级功率因数校正转换器
G. Nagaraju, S. B. Singh, N. Jayaram
This paper introduces a modified single-stage power factor correction (S2PFC) converter topology for high voltage, power and frequency (HVPF) applications which improves the power quality at utility AC side and at the load end. The modified proposed converter possess the ability of controlling the voltage and frequency independently and also simultaneously. The voltage can be controlled by PWM technique and also by dead time control which performs the boost operation. On the other side, frequency control can be obtained by using variable switching frequency. This paper presents the operation of the proposed converter topology, PWM switching scheme and MATLAB simulation results of the converter topology at a specific load are presented.
本文介绍了一种改进的单级功率因数校正(S2PFC)转换器拓扑结构,用于高电压、高功率和高频率(HVPF)应用,改善了公用事业交流侧和负载端的电能质量。改进后的变换器既能独立控制电压和频率,又能同时控制电压和频率。电压可以通过PWM技术控制,也可以通过死区时间控制来执行升压操作。另一方面,可以通过可变开关频率来实现频率控制。本文给出了所提出的变换器拓扑的工作原理、PWM开关方案以及特定负载下变换器拓扑的MATLAB仿真结果。
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引用次数: 1
A comparative study between different modulations techniques used in field oriented control induction motor drive 磁场定向控制感应电机驱动中不同调制技术的比较研究
T. Banerjee, J. Bera, S. Chowdhuri, G. Sarkar
In industries, where adjustable or variable speed drives are required, induction motor drives are chosen with various control strategies to have fast flux and torque response. In order to overcome sluggish response of induction motor and to have decoupled flux and torque characteristics, field oriented control (FOC) is implemented. These drives consists of voltage source inverters with various modulation schemes like SPWM, THISPWM, SVM etc. in order to minimize the harmonics present in the output voltage or current. Presence of harmonics makes the response non-sinusoidal and generate heating, torque pulsation etc within the machine. But for field oriented control induction motor drives, selection of efficient modulation scheme is important as machine current is controlled and in this current loop presence of ripples may create multiple zero crossing problems in the SPWM. In this paper, different modulation schemes are investigated and their performances are compared for a variable speed three phase FOC Induction motor. This system is modeled in MATLAB and SIMULINK where all the above stated modulation schemes are implemented. It is observed that the FOC based IM drive gives better result when subjected to Space Vector Modulation Scheme.
在需要可调或变速驱动器的工业中,选择感应电机驱动器并采用各种控制策略,以具有快速的磁链和转矩响应。为了克服感应电机的滞后响应,实现磁链和转矩特性的解耦,实现了磁场定向控制(FOC)。这些驱动器由具有各种调制方案的电压源逆变器组成,如SPWM, THISPWM, SVM等,以尽量减少输出电压或电流中存在的谐波。谐波的存在使响应非正弦,并在机器内产生发热、转矩脉动等。但对于磁场定向控制的感应电机驱动器,选择有效的调制方案是很重要的,因为电机电流是受控的,在这种电流环中,波纹的存在可能会在SPWM中产生多个过零问题。本文研究了变速三相FOC感应电动机的不同调制方案,并对其性能进行了比较。在MATLAB和SIMULINK中对系统进行了建模,实现了上述调制方案。结果表明,在空间矢量调制方案下,基于FOC的IM驱动器具有较好的性能。
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引用次数: 9
期刊
2016 2nd International Conference on Control, Instrumentation, Energy & Communication (CIEC)
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