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2014 Annual International Conference on Emerging Research Areas: Magnetics, Machines and Drives (AICERA/iCMMD)最新文献

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Asymmetric multilevel hybrid inverter with reduced number of switches 减少开关数量的非对称多电平混合逆变器
Babitha T. Abraham, A. Benny
Multilevel Inverter is an array of power semiconductors and capacitors that allow the generation of a high quality load voltage. But it requires greater number of power semiconductor switches with increase in number of levels. In this paper, three phase hybrid topology of multilevel inverter is used to reduce the number of switching devices in the entire converter system. The proposed topology is a hybrid of cascaded H-bridge multilevel inverter (CHBMLI) and neutral point clamped inverter multilevel inverter (NPCMLI) so as to obtain seven level output in each phase. Third harmonic injection is adopted to increase the line to line voltage. Asymmetric dc bus voltage ratio is used to increase the number of levels. The main objective of this hybridised structure is to increase the number of levels with reduced number of switches.
多电平逆变器是一组功率半导体和电容器,可以产生高质量的负载电压。但随着电平的增加,对功率半导体开关的要求也越来越高。本文采用多电平逆变器的三相混合拓扑结构来减少整个变换器系统中开关器件的数量。所提出的拓扑结构是级联h桥多电平逆变器(CHBMLI)和中性点箝位逆变多电平逆变器(NPCMLI)的混合结构,从而在每相获得7电平输出。采用三次谐波注入,提高线对线电压。非对称直流母线电压比用于增加电平数。这种混合结构的主要目的是在减少开关数量的同时增加电平的数量。
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引用次数: 5
Single phase PFC using Buck-Boost converter 采用Buck-Boost转换器的单相PFC
Riya Philip, C. Sreeja
Nowadays, low Power Factor (PF) is a serious problem that gained more importance in power electronics area. In this paper, single phase PFC using Buck-Boost circuit topology under linearization voltage control is realized. Here the nonlinear load considered is the diode bridge rectifier, and a Buck-Boost converter is connected to its back end for PFC. The switching of buck-boost converter is done by comparing the dc control signal with a saw tooth wave and its switching frequency is set to 100 kHz. The simulation analyses are carried out in Matlab/Simulink software. The effect of PFC Buck-Boost circuit on PF and the sinusoidal nature of line current are analyzed by the simulation results. Its effectiveness is experimentally validated by means of a self designed prototype. Experimental results show that, Buck-Boost circuit topology have an excellent ability for PFC. It makes the supply voltage and current in phase to each other and thus approximate the PF to unity.
低功率因数(PF)是当今电力电子领域日益重视的一个严重问题。本文采用Buck-Boost电路拓扑结构实现了线性化电压控制下的单相PFC。这里考虑的非线性负载是二极管桥式整流器,后端连接一个Buck-Boost变换器进行pfc, Buck-Boost变换器的开关是通过比较直流控制信号和锯齿波来完成的,开关频率设置为100khz。在Matlab/Simulink软件中进行仿真分析。仿真结果分析了PFC Buck-Boost电路对PF的影响以及线路电流的正弦特性。通过自行设计的样机,实验验证了其有效性。实验结果表明,Buck-Boost电路拓扑结构具有很好的ppf处理能力,使电源电压和电流相一致,从而使ppf近似为1。
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引用次数: 6
HFSI — A promising solution to very low speed issues in DTC-SVM induction motor drive HFSI -一个有前途的解决方案,非常低的速度问题,在DTC-SVM感应电机驱动
R. Mini, K. Anu, M. Dinesh
The stator flux and electromagnetic torque are directly controlled in a DTC system using space vector modulation technique. In DTC, torque and flux ripples increases at low speeds. A DTC-SVM induction motor drive at very low speeds is investigated here and High Frequency Signal Injection (HFSI) method is adopted to mitigate the low speed issues. In this method a sinusoidal wave of small amplitude and high frequency is injected along with the PI controller output of DTC-SVM. HFSI increases the switching frequency of SVM during low speed operation. This technique reduces torque ripple, acoustic noise, and gives excellent dynamic and steady state performance. The performance of DTC-SVM and DTC-SVM with HFSI at low speed is analyzed through simulation using matlab/simulink package. The results verify the merits of the DTC-SVM using HF injection technique with respect to DTC-SVM technique at very low speeds.
在直接转矩控制系统中,采用空间矢量调制技术直接控制定子磁链和电磁转矩。在直接转矩控制中,转矩和磁链波纹在低速时增大。本文研究了一种DTC-SVM异步电机在极低速下的驱动,并采用高频信号注入(HFSI)方法来缓解低速问题。该方法在DTC-SVM的PI控制器输出中注入一个小幅度高频的正弦波。HFSI增加了支持向量机在低速运行时的开关频率。该技术降低了转矩脉动和噪声,并提供了良好的动态和稳态性能。利用matlab/simulink软件包对DTC-SVM和DTC-SVM与HFSI的低速性能进行了仿真分析。实验结果验证了高频注入DTC-SVM相对于低速DTC-SVM技术的优越性。
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引用次数: 1
Development of portable standalone impedance measuring device for in vitro applications 便携式体外独立阻抗测量装置的研制
Saikat Sahoo, Senggam Wakhet, B. Champaty, Jobin Jose, Sai S. Sagiri, K. Pal
Electrical impedance measurement of the biological samples has evolved as a new field in biomedical engineering. This is due to the fact that the electrical properties of the biological samples change considerably during diseased and healthy conditions. Unfortunately, the devices available in the market are bulky and are quite costly. In this study, we report the development of a portable, standalone, multi-frequency (50 Hz-10 KHz) impedance measurement device with acceptable accuracy and resolution for in vitro impedance measurement of the cells.
生物样品的电阻抗测量已成为生物医学工程的一个新领域。这是由于在患病和健康状态下,生物样品的电学性质发生了相当大的变化。不幸的是,市场上现有的设备体积庞大,价格昂贵。在这项研究中,我们报告了一种便携式,独立的,多频率(50 Hz-10 KHz)阻抗测量装置的开发,具有可接受的精度和分辨率,用于细胞的体外阻抗测量。
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引用次数: 2
Hardware implementation of space vector PWM control of Permanent Magnet Synchronous Motor 永磁同步电动机空间矢量PWM控制的硬件实现
A. Vipin, S. George
Permanent Magnet Synchronous Motors (PMSM) are good option for electric vehicles, hybrid electric vehicles and used for many industrial, aerospace and domestic applications. This paper presents hardware implementation of PMSM drive system without using any position sensor. An open loop control is implemented to operate PMSM at various speeds. Discussed basic theory of space vector PWM for generating sinusoidal voltage to motor and realised with 16 bit microcontroller. A three phase inverter is designed and implemented to control 1 KW outer rotor PMSM. The motor is started and operated at various speeds by changing the inverter output frequency. Starting and running characteristics of PMSM in open loop is observed and discussed.
永磁同步电机(PMSM)是电动汽车,混合动力汽车的良好选择,并用于许多工业,航空航天和家庭应用。本文介绍了不使用任何位置传感器的永磁同步电机驱动系统的硬件实现。开环控制实现了在不同速度下运行PMSM。讨论了空间矢量PWM对电机产生正弦电压的基本原理,并用16位单片机实现。设计并实现了一种控制1kw外转子永磁同步电动机的三相逆变器。通过改变变频器的输出频率,电机以不同的速度启动和运行。对永磁同步电动机开环起动和运行特性进行了观察和讨论。
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引用次数: 7
Design and simulation of 30 kv solid state DC source 30kv固态直流电源的设计与仿真
R. Dhar, S. Bindu, S. George, P. C. Saroj, Archana Sharma
Marx generator is an impulse source used for testing of various equipments. High voltage DC source is input to Marx generator. Traditionally, DC sources used for Marx generator were of large size but now due to advancement in solid state devices it is possible to reduce size and weight of DC source. This paper explains the designing and simulation of 30 kV solid state DC source to Marx generator. It makes use of zero current switching - series resonant (ZCS-SR) full - bridge topology with high frequency transformer and six stage voltage multiplier circuit. For switching purpose MOSFET is used. Effect of resistive and capacitive load on output voltage is analyzed.
马克思发生器是一种用于各种设备测试的脉冲源。马克思发电机输入高压直流电源。传统上,用于马克思发电机的直流电源尺寸较大,但现在由于固态器件的进步,可以减小直流电源的尺寸和重量。本文介绍了马克思发电机用30kv固态直流电源的设计与仿真。它采用零电流开关串联谐振(ZCS-SR)全桥拓扑结构,配以高频变压器和六级倍压电路。用于开关目的的是MOSFET。分析了电阻性负载和容性负载对输出电压的影响。
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引用次数: 3
Analysis of power sharing on hybrid AC-DC microgrid 交直流混合微电网的电力共享分析
V. Hema, R. Dhanalakshmi
The proposed paper presents a Hybrid AC-DC microgrid to chop the process of multiple conversions in an individual AC microgrid or DC microgrid. The proposed hybrid microgrid compose of both AC microgrid and DC microgrid connected together by multilevel inverter. This paper concentrates on developing a control system for the hybrid AC-DC microgrid to manage power flows, which is more difficult than previously developed systems only for AC microgrid or DC microgrid. The objective is then to makeup a co-ordinated control system for power sharing within the sources in the hybrid AC-DC microgrid in proportion to the power ratings. The droop control technique is presented in this paper to control the hybrid microgrid. The droop control concept uses a suitable normalization technique for combining both the subgrids. The co-ordinated operation of DC and AC sources and multilevel inverter are investigated. Analysis of power sharing on hybrid AC-DC microgrid is done using MATLAB/SIMULINK.
本文提出了一种混合交直流微电网,以减少单个交流微电网或直流微电网中的多次转换过程。本文提出的混合微网由交流微网和直流微网通过多电平逆变器连接而成。本文重点研究了一种用于交直流混合微电网的潮流控制系统,该系统比以往开发的仅用于交流微电网或直流微电网的系统更困难。然后,目标是组成一个协调控制系统,以便在混合交直流微电网中按额定功率成比例地在电源内共享功率。本文提出了一种用于混合微电网控制的下垂控制技术。下垂控制概念使用合适的归一化技术来组合两个子网格。研究了交直流电源和多电平逆变器的协同工作。利用MATLAB/SIMULINK对交直流混合微电网的功率共享进行了分析。
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引用次数: 8
Off-line and real-time simulation Modelling of Electric Vehicle power train 电动汽车动力系统的离线实时仿真建模
Shelma George, R. V. Chacko, A. Mathew
Modelling of Electric Vehicle power train is analysed to evaluate the energy flow between electrical and mechanical sub systems. The indigenous platform SEQUEL gives more user configurability and new user element support for offline simulation. State-of-the-art real-time simulation facilitates the controller development and evaluation before making the plant prototype of system like EV. Because of the high frequency switching in power converter/inverter and due to complex motor dynamics detailed simulation of EV power train need high computation with simulation delta time of the order of 1-2 micro sec. This is practical in offline simulation where as presently available real-time simulators can do simulation in 50-100 micro seconds only. So the concept of average modelling is introduced in EV sub-systems to derive appropriate models to implement real time simulation.
对电动汽车动力传动系统进行建模分析,以评估电气和机械子系统之间的能量流动。自主平台SEQUEL为离线仿真提供了更多的用户可配置性和新的用户元素支持。先进的实时仿真技术有助于在制造电动汽车等系统的工厂原型之前进行控制器的开发和评估。由于功率转换器/逆变器中的高频开关以及复杂的电机动力学,电动汽车动力系统的详细仿真需要高计算量,仿真增量时间为1-2微秒。这在离线仿真中是实用的,目前可用的实时模拟器只能在50-100微秒内进行仿真。因此,在电动汽车子系统中引入平均建模的概念,推导出合适的模型来实现实时仿真。
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引用次数: 1
Active magnetic bearings for sodium pump 钠泵用主动磁轴承
R. Nirmalkumar, B. Sreedhar, G. Padmakumar, K. Rajan
Centrifugal Pumps are used in the primary and secondary heat transport systems of fast reactors for pumping liquid sodium. Lubrication oil leakage from the conventional bearings used in these pumps is a potential threat to cause reactivity changes which could result in extended reactor shut down. Actively controlled magnetic bearings which do not require lubrication is an excellent alternative to conventional bearings in overcoming these problems. The present work deals with the development of “Thrust and Radial Active” magnetic bearings for a small centrifugal sodium pump of 50 m3/h capacity, which controls both the axial and radial movements of rotor. The developed active magnetic bearing takes a thrust load of around 100kg, and a nominal radial load for the existing vertically-configured shaft system of the centrifugal pump. Performance of the active magnetic bearings has been tested successfully by running the pump up to the full operating speed of 2900 rpm and the measured vibration levels were well within the allowable limits of ISO 14839.
离心泵用于快堆一次和二次传热系统中泵送液钠。这些泵中使用的传统轴承的润滑油泄漏是引起反应性变化的潜在威胁,可能导致反应堆长时间关闭。主动控制磁轴承,不需要润滑是一个很好的替代传统轴承在克服这些问题。目前的工作涉及的“推力和径向主动”磁轴承的小型离心钠泵50立方米/小时的能力,它控制转子的轴向和径向运动的发展。开发的主动磁轴承承受约100kg的推力载荷,以及离心泵现有垂直配置轴系统的标称径向载荷。主动磁轴承的性能已通过运行泵到2900rpm的全速运行速度成功测试,测量的振动水平完全在ISO 14839的允许范围内。
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引用次数: 4
Face detection and facial feature extraction based on a fusion of knowledge based method and morphological image processing 基于知识的人脸检测和人脸特征提取方法与形态学图像处理相融合
S. Devadethan, Geevarghese Titus, S. Purushothaman
Detection of human face from an image is a very difficult process. There are many reasons that affect the detection process such as lighting condition, shadows, facial expression etc. Thus facial feature extraction itself becomes a difficult task. In order to propose an efficient method for facial feature extraction, we used the characteristic features of nostrils, eyes lips etc. In our method we assume that frontal face image is readily available. At first face regions detected by detecting the eye regions. After detecting the face region other feature points such as nostril, corners of eyes, corners of lips etc are extracted. At first eye pairs are obtained by finding and verifying possible eye regions. After detecting the eye regions, the distance between the eyes is used to find a possible face candidate. Next, the face is divided into different regions and facial features are extracted from the corresponding regions.
从图像中检测人脸是一个非常困难的过程。影响检测过程的原因有很多,如光照条件、阴影、面部表情等。因此,人脸特征提取本身就成为一项艰巨的任务。为了提出一种有效的人脸特征提取方法,我们利用了鼻孔、眼睛、嘴唇等特征特征。在我们的方法中,我们假设正面图像是现成的。首先通过检测眼睛区域来检测面部区域。在对人脸区域进行检测后,提取鼻孔、眼角、嘴角等其他特征点。首先,通过寻找和验证可能的眼睛区域来获得眼睛对。在检测到眼睛区域后,使用眼睛之间的距离来寻找可能的人脸候选人。接下来,将人脸划分为不同的区域,并从相应的区域提取人脸特征。
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引用次数: 16
期刊
2014 Annual International Conference on Emerging Research Areas: Magnetics, Machines and Drives (AICERA/iCMMD)
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