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2013 10th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology最新文献

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Calculation of shading effect in PV module by graphical method with experimental validation 用图解法计算光伏组件遮阳效果,并进行了实验验证
Noppadol Chuanchaiyakul, S. Chaitusaney
This paper proposed a method to calculate the operating point of photovoltaic (PV) generation system under shading effect. To simplify the algorithm, the graphical method is used in this research. The PV modules in each string are divided in to two group, i.e. shaded and unshaded groups. In addition, the double diode model with Bypass diode is proposed in this paper. This model is used to investigate the output characteristic, i.e. current, voltage, and power. The characteristic given from the PV model is used to plot the I-V and P-V graph for each PV group. The characteristic of each group is combined together to obtain the characteristic of the whole string. The graphical method is used to specify any peak power that occurs under shading effect. The result shows that the proposed method can determine the operating point of PV system when shading effect occurs without optimization.
提出了一种遮阳作用下光伏发电系统工作点的计算方法。为了简化算法,本研究采用了图形化的方法。每串中的光伏组件分为两组,即阴影组和非阴影组。此外,本文还提出了带旁路二极管的双二极管模型。该模型用于研究输出特性,即电流、电压和功率。利用PV模型给出的特征来绘制每个PV组的I-V和P-V图。将每一组的特性组合在一起,得到整根弦的特性。图形化方法用于指定在遮光效果下出现的任何峰值功率。结果表明,该方法可以在不进行优化的情况下确定光伏系统的工作点。
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引用次数: 2
The simple temperature control for induction cooker based on class-E resonant inverter 基于e类谐振逆变器的简易电磁炉温度控制
C. Ekkaravarodome, P. Charoenwiangnuea, K. Jirasereeamornkul
This paper presents a simple temperature control for high efficiency induction cooker based on class-E DC-AC resonant inverter. The active switch can be operated under the zero-voltage switching conditions. The conduction loss of the anti-parallel diode of the active switch and the harmonic currents injected into the public supply system can be reduced. The high power-factor and low line current harmonic distortion can be obtained, which are very attractive in term of commercial production. In order to achieve upon this objective, the induction cooker's parameters need to be designed properly and details of analysis and design of this induction cooker's components are described. A proposed high efficiency induction cooker is designed for an operating at a 32-kHz frequency, a 220-V line rms voltage, a 50-Hz line frequency and a 1.2-kW output power.
本文提出了一种基于e类直流-交流谐振逆变器的简易高效电磁炉温度控制方法。有源开关可以在零电压开关条件下工作。降低了有源开关反并联二极管的导通损耗和注入公共供电系统的谐波电流。可以获得高功率因数和低线路电流谐波畸变,在商业化生产方面具有很大的吸引力。为了实现这一目标,需要对电磁炉的参数进行合理的设计,并对电磁炉的各部件进行了详细的分析和设计。设计了一种高效电磁炉,工作频率为32khz,线路均方根电压为220v,线路频率为50hz,输出功率为1.2 kw。
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引用次数: 13
Improving the efficiency of power supplies with an adaptive control method 采用自适应控制方法提高电源效率
M. Mahdavian, M. B. Poudeh, N. Wattanapongsakorn
Normally power supplies provide a constant output voltage. A DC-DC converter in most of the applications is controlled by a voltage mode or a current mode controller. The DC converters are employed to feed electric vehicles, telephone sets and civil invertors, or for induction motors and frequency control. In this regard, optimal exploitation of DC transformed by classical controllers has been a controversial issue in reputable journal publications. Due to their switching property included in their structure, DC-DC converters have a non-linear behavior and their controlling design is accompanied with complexities. However, by employing the average method, it is possible to simplify the system as a linear system and exploiting linear control methods. In this article, an attempt is made to control the buck converter by PI and PID controllers. By using PID controller and genetic algorithm, a new adaptive control method model is introduced. A Genetic algorithm is applied to discover the supreme values for PID controller's parameters within a short time period. The improvement of the current control response is the result of the simulation.
正常情况下,电源提供恒定的输出电压。在大多数应用中,DC-DC变换器由电压模式或电流模式控制器控制。直流变换器用于为电动汽车、电话机和民用逆变器供电,或用于感应电动机和频率控制。在这方面,经典控制器转换的DC的最佳利用一直是著名期刊出版物中有争议的问题。由于DC-DC变换器的开关特性包含在其结构中,因此具有非线性特性,其控制设计也较为复杂。然而,通过采用平均方法,可以将系统简化为线性系统并利用线性控制方法。本文尝试用PI控制器和PID控制器对降压变换器进行控制。采用PID控制器和遗传算法,提出了一种新的自适应控制方法模型。采用遗传算法求出短时间内PID控制器参数的最大值。电流控制响应的改善是仿真的结果。
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引用次数: 4
A simulation of air bearing surface materials with copper substrate for corrosion investigation 用铜衬底模拟空气轴承表面材料的腐蚀研究
S. Chatruprachewin, C. Nuthong
Corrosion defect is one of the important defects found in hard disk drive manufacturing. Fail to detect this defect might lead to fatal hard disk drive failure. In general, corrosion defect was found after the end of process. The fundamental methodology used to measure corrosion defect in head magnetic process of hard disk drive manufacturing is Electrochemical impedance spectroscopy (EIS). This method applies a low frequency voltage to a chemical cell in order to measure corrosion rate which is defined as a reaction of material in aqueous solution. The data obtained from EIS measurement method are complex and thus hard to analyze. Furthermore, EIS method is destructive materials measurement and the obtained results cannot well predict corrosion behavior of the system. However, head magnetic materials/slider is a stack of three materials in layers i.e. soft magnetic layer, diamond like carbon (DLC) layer, and photoresist layer respectively. These three stack layer of slider can be replaced by R-C equivalent circuit. Nyquist plot and Bode plot are used to observe the frequency response of the equivalent circuit. This observation can help in prediction of corrosion behavior before starting of mass fabrication or transferring to new materials. This work shows that the results obtained from an equivalent R-C circuit model of copper substrate coated with photoresist and the one obtained from EIS method are comparable. It should be noted that the parameters of R-C equivalent circuits are modified for corrosion behavior studying according to two different types of photoresists.
腐蚀缺陷是硬盘制造中常见的重要缺陷之一。未能检测到此缺陷可能导致致命的硬盘驱动器故障。一般来说,腐蚀缺陷是在工艺结束后发现的。测量硬盘磁头磁性加工过程中腐蚀缺陷的基本方法是电化学阻抗谱法。这种方法在化学电池上施加低频电压来测量腐蚀速率,腐蚀速率被定义为物质在水溶液中的反应。EIS测量方法获得的数据复杂,难以分析。此外,EIS方法是破坏性材料测量,所得结果不能很好地预测体系的腐蚀行为。然而,磁头磁性材料/滑块是三层材料的堆叠,即软磁层、类金刚石碳(DLC)层和光刻胶层。这三层滑块的堆叠层可以用R-C等效电路代替。用奈奎斯特图和波德图观察等效电路的频率响应。这种观察有助于在开始批量制造或转移到新材料之前预测腐蚀行为。本文的研究结果表明,镀有光刻胶的铜衬底等效R-C电路模型与EIS方法的结果具有可比性。值得注意的是,根据两种不同类型的光阻剂,对R-C等效电路的腐蚀行为进行了修正。
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引用次数: 0
Heat cycles test set for power cable 电力电缆热循环测试仪
A. Phayomhom, K. Kveeyarn
The heat cycles test set is designed and built in accordance with what is discussed in the article for high voltage cables testing [1, 2]. The test set feeds current periodically into the cable under testing. In on-cycle, the test set heats up the cable for at least 8 hours while in the off-cycle, it allows the cable to cool down for at least 16 hours until its conductor temperature is within 10 °C above the ambient temperature. The current that is fed into the cable during the on-cycle is to be recorded for 2 consecutive hours when the conductor temperature remains constant as per the insulation standard (IEC 60840-2004). The heat cycles test set has two separate current sources, which can be used independently. Programmable Logic Control (PLC) is used in controlling the operations of the test set, e.g. the two current sources can be programmed to work together, moreover, the number of testing cycles, feeding current, and also the resulted temperature of any on-cycle can be selected. In conclusion, the test set built as described, can perform its functions satisfyingly while accomplishing cost reduction. This is because an imported test set of the same kind is more expensive. Besides, a digital recorder is installed for recording temperature and current during testing. An acceptable error of 1.45% to -1.62% of the test set is obtained when undergone the calibration.
针对高压电缆的测试[1,2],热循环试验台是按照文中讨论的内容设计搭建的。测试装置定期将电流输入被测电缆。在通周期中,测试装置加热电缆至少8小时,而在非周期中,它允许电缆冷却至少16小时,直到其导体温度高于环境温度10°C以内。根据绝缘标准(IEC 60840-2004),在导体温度保持不变的情况下,连续2小时记录导通周期输入电缆的电流。热循环测试装置有两个独立的电流源,可以独立使用。可编程逻辑控制(PLC)用于控制测试装置的操作,例如,可以编程两个电流源一起工作,并且可以选择测试周期数,馈电电流以及任意周期的结果温度。综上所述,所构建的测试集在实现成本降低的同时,能够很好地发挥其功能。这是因为进口的同类测试集比较贵。此外,还安装了数字记录仪,用于记录测试过程中的温度和电流。经过校准后,测试集的可接受误差为1.45%至-1.62%。
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引用次数: 3
Routing protocol for virtualization of Wireless Sensors Networks 无线传感器网络虚拟化的路由协议
T. Ngo, D. Q. Nguyen
Our developed protocol Energy Aware Mesh Routing EMRP is a robust, cluster-based routing technique used in Wireless Sensor Network (WSN). It can provide a reliable, scalable, energy efficient multipath routing mechanism for data transmission to Base Station (BS). This scheme is also classified as a routing technique supporting virtualization WSN (VSN) as it can share network resources between different VSNs for achieving resource efficiency. In this paper, we propose a new dynamic switch process for EMRP that use the current energy value of relay and backup node and evaluate the performance of new switch strategy in terms of total residual energy, load balance, network lifetime and rate delivery compared with the old scheme. Via simulation, we realize that the newEMRP protocol can achieve better rate delivery and load balance than EMRP. Furthermore, we analyze and evaluate an application case of virtualization in OMNET++ that utilizes our two routing algorithms in order to investigate the capability of collaboration and network resource sharing between different VSNs. Our simulation result shows that both schemes can achieve collaboration and efficient network resource sharing for the purpose of virtualization. More concretely, the newEMRP protocol can achieve better capability of network resource sharing than the old protocol.
我们开发的协议Energy - Aware Mesh Routing EMRP是一种用于无线传感器网络(WSN)的鲁棒的、基于集群的路由技术。它可以为数据传输到基站(BS)提供可靠、可扩展、节能的多路径路由机制。该方案也被归类为支持虚拟化WSN (virtual WSN, VSN)的路由技术,因为它可以在不同的VSN之间共享网络资源,以达到资源效率。本文提出了一种新的EMRP动态交换策略,利用中继和备份节点的当前能量值,并从总剩余能量、负载平衡、网络寿命和速率传输等方面与旧方案进行了比较。通过仿真,我们发现新的EMRP协议可以实现比EMRP更好的速率传输和负载平衡。此外,我们还分析和评估了在omnet++中使用我们的两种路由算法的虚拟化应用案例,以研究不同vpn之间的协作和网络资源共享能力。仿真结果表明,两种方案都能实现协作和高效的网络资源共享,实现虚拟化。具体来说,新emrp协议可以实现比旧协议更好的网络资源共享能力。
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引用次数: 2
Evaluation of the requirements for battery energy storage system to postpone the investment of distribution system 蓄电池储能系统需求评估,推迟配电系统投资
C. Wannasut, K. Hongesombut
This paper proposes the application of the battery energy storage system (BESS) to be installed in the distribution system for the purpose of postponing the investment of the distribution reinforcement in the short term power distribution planning. A study case of the distribution system including the photovoltaic system and the BESS obtained from the Provincial Electricity Authority (PEA) is used to evaluate the requirements of the BESS to be installed in the distribution system by considering four types of loads which are household, small enterprise, industry and other types. It reveals from the study that the installation of the BESS can effectively extend the time of the new distribution line construction.
本文提出将电池储能系统(BESS)安装在配电系统中,以在短期配电规划中推迟配电加固的投资。本文以省电力局提供的包括光伏系统和BESS在内的配电系统为研究案例,通过考虑家庭、小企业、工业和其他四种类型的负荷,对配电系统中安装BESS的要求进行了评估。研究表明,BESS的安装可以有效地延长新配电线路的建设时间。
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引用次数: 4
Estimation of respiratory rate from smartphone's acceleration data 从智能手机的加速数据估计呼吸频率
Thanakij Pechprasarn, Suporn Pongnumkul
Abnormal respiratory rates have been shown to be an important predictor of serious clinical illness, but respiratory rate is a vital sign that is often not recorded because methods for measuring respiratory rates are cumbersome. We propose an approach to record and monitor respiratory rate of a patient that is lying down by placing an accelerometer-equipped smartphone on the patient's chest. We develop an algorithm based on fast Fourier transform (FFT) to estimate the respiratory rate from the noisy acceleration data. The main contribution of this paper is that our proposed algorithm can estimate respiratory rates using only tri-axial acceleration data from sensor in commodity smartphones without any other special equipment. Preliminary results show that our method can reasonably estimate the respiratory rate.
异常呼吸频率已被证明是严重临床疾病的重要预测指标,但由于测量呼吸频率的方法繁琐,呼吸频率是一个通常没有记录的生命体征。我们提出了一种方法来记录和监测呼吸频率的病人躺下,通过放置一个配备加速度计的智能手机在病人的胸部。提出了一种基于快速傅里叶变换(FFT)的呼吸速率估计算法。本文的主要贡献在于,我们提出的算法可以仅使用来自商用智能手机传感器的三轴加速度数据来估计呼吸速率,而无需任何其他特殊设备。初步结果表明,该方法可以合理地估计呼吸速率。
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引用次数: 14
Detection of Premature Ventricular Contraction for real-time applications 检测室性早搏的实时应用
Supat Ittatirut, Apiwat Lek-uthai, A. Teeramongkonrasmee
This paper proposes a real-time algorithm of Premature Ventricular Contraction (PVC) detection based on a low computational method. This algorithm considers three time-domain features which are RR-interval, QRS-width and QRS-pattern. Simple decision rules are used in the classifier process which is suitable for embedded applications. The algorithm was tested with 26 ECG records from MIT-BIH Arrhythmia Database (MIT-DB). After evaluation, the performance of the proposed method has 91.05% of sensitivity and 99.55% of specificity.
提出了一种基于低计算方法的室性早搏实时检测算法。该算法考虑了三个时域特征:rr间隔、qrs宽度和qrs模式。在分类器过程中使用了简单的决策规则,适合嵌入式应用。用来自MIT-BIH心律失常数据库(MIT-DB)的26条心电记录对该算法进行了测试。经评价,该方法的灵敏度为91.05%,特异度为99.55%。
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引用次数: 8
A long duration impulse current generator for testing surge arresters in distribution systems 用于测试配电系统中避雷器的长持续时间脉冲电流发生器
Chatariya Prasertsang, Nawakun Triuattanapiruk, P. Yutthagowith
This paper presents development of a long duration impulse current generator for testing surge arresters in distribution systems. The developed generator was designed by hand calculation at the beginning stage, then with the help of EMTP/ATP simulation. The design of the generator circuit parameters (resistors, inductor, and capacitors) is provided in this paper. The effect of internal resistance of an inductor to the current waveform is presented. An approach for adjusting the circuit parameters of the generator to obtain the current waveform accordance with the standard is also proposed. The generated current waveform has met the requirements of IEC standard. The developed long duration current generator was employed to generate current for testing a surge arrester in an HV laboratory. This accomplishment will be useful in test and evaluation of surge arrester performance.
本文介绍了一种用于测试配电系统避雷器的长历时脉冲电流发生器的研制。所开发的发电机在初始阶段采用手工计算的方法进行设计,然后借助EMTP/ATP仿真。本文给出了发电机电路参数(电阻、电感和电容)的设计。给出了电感内阻对电流波形的影响。提出了一种调整发电机电路参数以获得符合标准的电流波形的方法。生成的电流波形符合IEC标准的要求。研制的长时程电流发生器用于高压实验室雷电避雷器试验。这一成果将有助于对避雷器性能的测试和评价。
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引用次数: 1
期刊
2013 10th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology
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