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2017 IEEE International Conference on Power, Control, Signals and Instrumentation Engineering (ICPCSI)最新文献

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Mitigation of total harmonic distortion using cascaded MLI-DSTATCOM in distribution network 级联MLI-DSTATCOM缓解配电网总谐波畸变
Khushaboo Rani Shandilya, U. Patel
In this modern generation almost every power supplies are non-linear loads which contains electronic devices that do not conduct current over the full cycle of the applied voltage, and thus they introduce harmonics into the power network. Electronic front end of non linear load makes them more efficient than linear loads and these non-linear front ends are one of the source of harmonic. Harmonic is nothing but a signal or a wave having frequency is an integral (whole-number) multiple of the frequency of some reference signal or wave or fundamental frequency. Harmonic causes losses in the power distribution network and can lead to increased cost due to maintenance, failures or device de-rating and thus decreases the power quality of the power distribution network. Power quality may be defined as a set of electrical characteristics that allows a piece of equipment to function in its desired manner without any interruption and significant loss of performance or life expectancy. Total harmonic distortion (THD) is an important figure of merit used to quantify the level of harmonics in voltage or current waveforms. In this paper Distribution Static Compensator (DSTATCOM) with Synchronous Reference Frame based control which taking into account Three-Level Cascaded multi level Inverter for minimization of harmonics in Power System. This Three level Cascaded multilevel inverter supply low harmonics distortion, reduced number of switches, suppression of switching losses and take out the Total Harmonics Distortion (THD).
在这个现代时代,几乎所有的电源都是非线性负载,其中包含在整个施加电压周期内不传导电流的电子设备,因此它们将谐波引入电网。非线性负载的电子前端使其比线性负载更高效,而这些非线性前端是谐波的来源之一。谐波只是一个信号或波,其频率是某个参考信号或波或基频频率的整数倍。谐波不仅会造成配电网的损耗,还会因维护、故障或设备降级而导致成本增加,从而降低配电网的电能质量。电能质量可以定义为一组电气特性,它允许设备以其期望的方式工作,而不会有任何中断和性能或预期寿命的重大损失。总谐波失真(THD)是一个重要的性能指标,用于量化电压或电流波形中的谐波水平。本文提出了一种基于同步参考系控制的配电静态补偿器(DSTATCOM),它考虑了三电平级联的多电平逆变器,以实现电力系统谐波的最小化。该三电平级联多电平逆变器提供低谐波失真,减少开关数量,抑制开关损耗,消除总谐波失真(THD)。
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引用次数: 3
Classification of lung nodules with feature extraction using CT scan images 基于CT扫描图像特征提取的肺结节分类
M. Jayalaxmi, J. Dhanaselvam, R. Swathi, M. Babu
OBJECTIVE: The main aim is to differentiate the various types of lung nodules using the SVM classifier. By identifying the lung nodules, the cause of lung cancer can be avoided. METHODOLOGY: The major contributions in this system are (i) Patch based division, to partition the original images (ii) Feature extraction stage, to extract feature information (iii) Classification stage, to classify the four types of lung nodules with the help of SVM classifier with pLSA. FINDINGS: This system has an improvement with the Local Tetra Pattern (LTrP) to provide more feature information. This pattern extracts feature information from more than two direction to give accurate results. IMPROVEMENT: This system can be improved with different classifier to achieve accurate classification.
目的:主要目的是利用SVM分类器区分不同类型的肺结节。通过鉴别肺结节,可以避免肺癌的发生。方法:本系统的主要贡献有:(i)基于Patch的分割,对原始图像进行分割;(ii)特征提取阶段,提取特征信息;(iii)分类阶段,利用SVM分类器结合pLSA对四种类型的肺结节进行分类。结果:该系统改进了局部利乐模式(ltp),提供了更多的特征信息。该模式从两个以上的方向提取特征信息,从而得到准确的结果。改进:本系统可采用不同的分类器进行改进,实现准确的分类。
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引用次数: 0
Implementation of novel vector based current control method for DC capacitor voltage regulation in DStatcom 基于矢量的直流电容电压调节电流控制方法在DStatcom中的实现
S. Isac, S. Srinath
This paper introduces a novel current control method to regulate the capacitor voltage of DStatcom and thereby improve the quality of electrical power in the distribution system continuously. Proportional Integral controller seems to be appropriate in regulation of voltage and that is limited to some extent. The proposed control strategy regulates the capacitor voltage of DStatcom along with elimination of power quality problems. A vector based Hysteresis current controller is used with hysteresis comparators in multilevel integrated with a switching table which shows fast transient response for load parameter variations. An evaluation is carried out with MATLAB/Simulink and it shows excellent performance. The performance of the method is found good for DStatcom with both balanced linear and nonlinear loads.
本文介绍了一种新的电流控制方法来调节DStatcom的电容电压,从而不断提高配电系统的电能质量。比例积分控制器在电压调节方面似乎是合适的,但也有一定的局限性。该控制策略在调节DStatcom电容电压的同时,消除了电能质量问题。基于矢量的迟滞电流控制器与多电平迟滞比较器相结合,结合开关表对负载参数变化有快速的瞬态响应。在MATLAB/Simulink环境下进行了仿真,结果表明该方法具有良好的性能。结果表明,该方法对具有平衡线性和非线性载荷的DStatcom具有良好的性能。
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引用次数: 0
BER performance evaluation of cognitive radio network using M-ary PSK over Rayleigh fading channel 瑞利衰落信道上基于m -玛利PSK的认知无线网络误码率性能评价
K. Bilal, A. Mohamed
Cognitive radio technology has come out to solve the problem of bandwidth scarcity by allowing the unlicensed users to use the licensed bands opportunistically. Spectrum sensing is the basic and essential mechanisms of Cognitive Radio to find the unused Spectrum. This paper, focus on the performance evaluation of energy detection spectrum sensing of cognitive radio network in term of bit error rate versus signal to noise ratio for M-ary phase shift keying modulation schemes, over Rayleigh fading channel and AWGN. The cognitive radio network was designed firstly as computer model showed the sequence of processes in cognitive radio system and then the simulation of cognitive radio network was performed using MATLAB simulation. The results show that as the number of Mary increase the bit error rate increased while the bit error rate decreased as the signal to noise ratio increased.
认知无线电技术是为了解决带宽短缺的问题而出现的,它允许未经许可的用户投机地使用已许可的频段。频谱感知是认知无线电发现未使用频谱的基本和必要机制。本文从误码率与信噪比的角度对认知无线网络能量检测频谱感知在瑞利衰落信道和AWGN下的性能进行了评价。首先通过计算机模型展示认知无线电系统的过程顺序,设计认知无线电网络,然后利用MATLAB仿真对认知无线电网络进行仿真。结果表明,随着Mary数的增加,误码率增大,而随着信噪比的增大,误码率减小。
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引用次数: 2
Investigate the effect of dust deposition on the performance of solar PV module using LABVIEW based data logger 利用基于LABVIEW的数据记录仪研究了粉尘沉积对太阳能光伏组件性能的影响
Vinay Gupta, Prateek Raj, A. Yadav
With the growing demand of energy across the globe, different sources and alternatives of energy has been invented or improved but PV system has been proven to be the best energy generating source. This type of dependency on solar energy is seen due to its perpetual source of energy and negligible side effect. But the efficiency of solar cell is affected due to many internal factors (due to component used in manufacturing) as well as external/environmental factors (wind, dust, humidity, location etc.). The objective of this project is to analyse the effect of dust on the performance of PV system in Manipal University, Jaipur with the use of LABVIEW based data logger. All the important parameters (open circuit voltage, short circuit current, output power etc.) related to both the panels were noted down and compared with the use of characteristic curve. It was observed that reduction in power generation of unclean panel was 9% after 55 days.
随着全球能源需求的不断增长,各种能源和替代能源被发明或改进,但光伏系统已被证明是最好的能源发电方式。这种对太阳能的依赖是由于其永久的能源和微不足道的副作用。但是太阳能电池的效率受到许多内部因素(由于制造中使用的组件)以及外部/环境因素(风,灰尘,湿度,位置等)的影响。本项目的目的是利用基于LABVIEW的数据记录仪,分析灰尘对斋浦尔马尼帕尔大学光伏系统性能的影响。记录下与两个面板相关的所有重要参数(开路电压、短路电流、输出功率等),并使用特性曲线进行比较。观察发现,55天后,不洁面板的发电量减少了9%。
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引用次数: 14
Early detection of lung cancer using SVM classifier in biomedical image processing SVM分类器在生物医学图像处理中的肺癌早期检测
Deep Prakash Kaucha, P. Prasad, A. Alsadoon, A. Elchouemi, Sasikumaran Sreedharan
Image processing techniques are now commonly used in the medical field for early detection of diseases. This research aims to improve accuracy, sensitivity and specificity of early detection of lung cancer through a combination of image processing techniques and data mining. The Computed Tomography (CT) scan image of the lungs is pre-processed and the Region of Interest (ROI) segmented, retained and compressed using a DWT (Discrete Waveform Transform) technique. The resulting ROI image is decomposed into four sub frequencies, bands LL, HL, LH, and HH. Again, the LL sub frequency is decomposed into four sub-bands, applying a 2-level DWT to the ROI based image. Further, features such as entropy, co-relation, energy, variance and homogeneity are extracted from the 2-level DWT images using a GLCM (Gray level Co-occurrence Matrix) with classification effected by means of an SVM (Support Vector Machine). Classification identifies whether the CT image is normal or cancerous. The Lung Image Database Consortium dataset (LIDC) has been used for training and testing purpose for this study. A Receiver Operating Characteristics (ROC) curve is used to analyze the performance of the system. Overall the system has accuracy of 95.16%, sensitivity of 98.21% and specificity of 78.69%.
图像处理技术现已广泛应用于医学领域,用于疾病的早期检测。本研究旨在通过图像处理技术与数据挖掘技术的结合,提高肺癌早期检测的准确性、灵敏度和特异性。对肺部的CT扫描图像进行预处理,并使用DWT(离散波形变换)技术对感兴趣区域(ROI)进行分割、保留和压缩。得到的ROI图像被分解为四个子频率,LL、HL、LH和HH波段。同样,将LL子频率分解为四个子带,对基于ROI的图像应用2级DWT。利用灰度共生矩阵(GLCM)提取2级DWT图像的熵、相关、能量、方差、同质性等特征,并利用支持向量机(SVM)进行分类。分类识别CT图像是正常的还是癌变的。肺图像数据库联盟数据集(LIDC)用于本研究的训练和测试目的。接收机工作特性(ROC)曲线用于分析系统的性能。总体而言,系统准确率为95.16%,灵敏度为98.21%,特异性为78.69%。
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引用次数: 32
Improving power efficiency of OFDM based FSO system using linear companding transform 利用线性压缩变换提高基于OFDM的FSO系统的功率效率
M. Selvi
Radio on Free Space Optics — RoFSO is cost effective and efficient in transferring high data rate that can be compared with optical fiber transmission. OFDM based FSO can further increase the data rate and at the same time can overcome the drawbacks of atmospheric turbulence of the free space like scintillation effect that has been considered in this paper. OFDM based FSO is an emerging solution for “last mile” broadband connectivity where deployment of fiber is not possible. Besides this it is also possible to use FSO for Inter chip connectivity, interplanetary communication etc. Using OFDM in optical domain must be power efficient so that the amount of DC bias added to the OFDM signal to make it unipolar is less. Performance of the PSK baseband modulated OFDM based FSO system with three different Linear Companding Transform-LNST, ALCT and CLCT is studied. The comparative study shows that, of the three transforms, CLCT performs better providing 20% power efficiency. Also it has the flexibility in the choice of number of subcarrier for transmission, as the PAPR remains same for change in number of subcarrier. 2 — 5 dB performance of CLCT companded OFDM is better than the other two transforms.
自由空间光学无线电- RoFSO在传输可与光纤传输相媲美的高数据速率方面具有成本效益和效率。基于OFDM的FSO可以进一步提高数据速率,同时克服了本文所考虑的类自由空间闪烁效应的大气湍流的缺点。基于OFDM的FSO是“最后一英里”宽带连接的新兴解决方案,在这种情况下不可能部署光纤。除此之外,还可以使用FSO进行芯片间连接,星际通信等。在光域使用OFDM必须是低功耗的,这样OFDM信号中加入的使其单极的直流偏置量就会减少。研究了三种不同线性压缩变换(lst、ALCT和CLCT)的PSK基带调制OFDM FSO系统的性能。对比研究表明,在三种变换中,CLCT在功率效率为20%时表现较好。在子载波数目的选择上也具有灵活性,因为当子载波数目改变时,PAPR保持不变。CLCT复合OFDM的2 ~ 5db性能优于其他两种变换。
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引用次数: 0
Comparative and identification of exact frequency domain approaches by using mammogram images 用乳房x光图像比较和识别精确的频域方法
B. Kiran Bala, I. I. Raj
To identify the variation between tumor and breast cancer in earlier stage itself with the help of mammogram images by using MIAS database. To extract the best transforms in frequency domain with the help of comparative analysis of result, The proposed sectional metric for the identification for the input images like age wise, left and right image taken in this process and finally from the result system taken this transform for the entire process.
利用MIAS数据库,借助乳房x线照片识别肿瘤与早期乳腺癌本身的差异。通过对结果的对比分析,在频域上提取出最佳变换,提出了对输入图像进行识别的截面度量,如年龄、左右图像,最后从结果系统中对整个过程进行该变换。
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引用次数: 3
Methods to reduce the starting current of an induction motor 减小感应电动机起动电流的方法
M. Habyarimana, D. Dorrell
An inrush current is produced when an electric load is turned on. For an induction motor this current can reach 5–10 times the full-load current. This transient current can cause issues in large machines attached to weak grid connections. To protect the grid connection this paper explores ways that the starting current can be reduced. Standard starting techniques are reviewed then the starting energy and reactive power requirements are examined by way of example. These illustrate that to some degree the starting current can be reduced with a tuned capacitor bank; however, for better reduction then an energy storage unit is used, such as a battery or a storage capacitor, and this is accessed through a PWM inverter for charging and discharging.
当电负载接通时,会产生涌流。对于感应电机,这个电流可以达到满载电流的5-10倍。这种瞬态电流可能会导致连接到弱电网的大型机器出现问题。为保护电网连接,本文探讨了减小起动电流的方法。回顾了标准起动技术,并通过实例考察了起动能量和无功功率要求。这些表明,在某种程度上,可以通过调谐电容器组来减小启动电流;然而,为了更好地减少,则使用能量存储单元,例如电池或存储电容器,并且通过PWM逆变器进行充电和放电。
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引用次数: 20
Performance analysis of spectrum sensing detection techniques for overlay users 覆盖用户频谱感知检测技术性能分析
B. Priyanka, U.V. Ratna Kmari
In the developing world, the usage of mobile phones and other data communication devices are unavoidable which results in congestion of spectrum. Cognitive Radio is a technology which helps us to use spectrum efficiently. Cognitive Radio offers a solution by utilizing the spectrum holes that represent the potential opportunities for non-interfering use of spectrum which requires three main tasks — Spectrum Sensing, Spectrum Analysis and Spectrum Decision Making. Spectrum Sensing means ability to measure, sense and be aware of the parameters related to radio channel characteristics, availability of the spectrum and transmit power, interference and noise, radio's operating environment, user requirements and applications. The Overlay Cognitive Radio model makes it possible to have two concurrent transmissions in a given interference region, where conventionally only one communication can take place at a given time. In this paper, spectrum sensing methods namely Computationally Efficient Energy Detection, Logical Selection and Wideband Spectrum Sensing using Sub-Nyquist Sampling are discussed.
在发展中国家,移动电话和其他数据通信设备的使用是不可避免的,这导致了频谱的拥挤。认知无线电是一种帮助我们有效利用频谱的技术。认知无线电提供了一种解决方案,它利用了频谱漏洞,这些漏洞代表了频谱无干扰使用的潜在机会,这需要三个主要任务——频谱感知、频谱分析和频谱决策。频谱感知是指测量、感知和了解无线电信道特性、频谱可用性和发射功率、干扰和噪声、无线电工作环境、用户要求和应用等相关参数的能力。叠加认知无线电模型使得在给定的干扰区域内同时进行两次传输成为可能,而传统上在给定的时间内只能进行一次通信。本文讨论了基于计算效率的能量检测、逻辑选择和基于亚奈奎斯特采样的宽带频谱感知方法。
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引用次数: 1
期刊
2017 IEEE International Conference on Power, Control, Signals and Instrumentation Engineering (ICPCSI)
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