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2021 3rd International Youth Conference on Radio Electronics, Electrical and Power Engineering (REEPE)最新文献

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Development of a methodology for the assessment of the actual contribution of a certain consumer to the distortion of the voltage sinusoid 开发了一种评估某一消费者对电压正弦波失真的实际贡献的方法
Anna Y. Gerasimyuk, Natalia V. Smokovenko, R. Nasyrov, Dmitry A. Kalenkin
This article addresses the main reason for the deterioration of the power quality. This is the influence of nonlinear electrical receivers. The developed methods for assessing the actual contribution of the consumers to the distortion of the voltage waveform don’t reflect all the factors influencing on the power quality indicators. That’s why the authors of the article have developed their own assessment methodology excluding previous disadvantages. The idea is based on the determination of the actual contribution of electrical receivers based on continuous measurement of their current-voltage characteristics. The novelty of the method is that the measurement takes place in real time. The results obtained show how the actual contribution to the distortion of the voltage waveform are distributed between consumers at any given time. The modelling results can be used in the operation of the distribution electricity network when a new consumer is connected to it.
本文论述了造成电能质量恶化的主要原因。这是非线性电子接收器的影响。现有的评估用户对电压波形失真的实际贡献的方法并不能反映影响电能质量指标的所有因素。这就是为什么这篇文章的作者开发了自己的评估方法,排除了以前的缺点。这个想法是基于对电流-电压特性的连续测量来确定电子接收器的实际贡献。该方法的新颖之处在于测量是实时进行的。得到的结果表明,在任何给定时间,对电压波形失真的实际贡献是如何在消费者之间分布的。建模结果可用于新用户接入配电网时配电网的运行。
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引用次数: 0
Comparison of The Methodology for Calculating Short-Circuit Currents Taking into Account Asynchronous Motors 考虑异步电动机的短路电流计算方法的比较
Abdullo Majidov, S. Hafizov, Temirkhan Isaev, Rustamzhon Nortozhiev, M. Pashaev, Kamoldzhon Yuldashev
This paper discusses the issue of accounting for the effect of asynchronous motors on the short-circuit current if the rated current of the asynchronous motors more than 1.0% of the initial value of the periodic component of the short-circuit current in auxiliary systems of power plants and substations. As an example, the operating VIII - section of the auxiliary system of TPP (Thermal Power Plant) #1 in Dushanbe, the Republic of Tajikistan with nine asynchronous motors. The description of the computational-mathematical model in the ETAP (Electrical Transient Analyzer Program) program is given. With the help of the given model, the standards GOST 28249-93 and IEC 60909 were compared in order to assess their qualities in terms of solving the problem, the difference as a result of the calculation. This technique makes it possible to improve the method of accounting for the effect of asynchronous motors on the short-circuit current.
本文讨论了电厂、变电站辅助系统中异步电动机额定电流大于短路电流周期分量初值1.0%时,异步电动机对短路电流影响的核算问题。以塔吉克斯坦共和国杜尚别TPP(火力发电厂)1号辅助系统运行的8段为例,该辅助系统有9台异步电动机。给出了ETAP (Electrical Transient Analyzer Program)程序中计算数学模型的描述。在给定模型的帮助下,比较了GOST 28249-93标准和IEC 60909标准,以评估它们在解决问题方面的质量,计算结果的差异。这种技术使计算异步电动机对短路电流影响的方法得到改进。
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引用次数: 0
Welford’s algorithm for weighted statistics 加权统计的韦尔福德算法
Andrey A. Efanov, S. Ivliev, Alexey G. Shagraev
The Wellford method is a simple and effective way to calculate averages, variances, covariances, and other statistics. This method has several excellent properties: achieves high performance on the accuracy of decisions; it is straightforward to understand and implement; it is a one-pass online algorithm, which is extremely useful in some situations. Wellford’s original article published in 1962. Nevertheless, it cannot the algorithm is not widely known at present. Moreover, it is a non-trivial task to find a mathematical proof of its correctness or experimental comparisons with other methods. This article attempts to fill these gaps.
Wellford方法是计算平均值、方差、协方差和其他统计数据的一种简单而有效的方法。该方法具有以下几个优点:在决策的准确性上达到了较高的性能;它很容易理解和执行;它是一种一次性在线算法,在某些情况下非常有用。Wellford的原始文章发表于1962年。然而,目前该算法还没有得到广泛的了解。此外,找到数学证明其正确性或与其他方法的实验比较是一项重要的任务。本文试图填补这些空白。
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引用次数: 2
A feasibility study on CSP technology to comply with Bangladesh to its power system competency 光热发电技术符合孟加拉国电力系统竞争力的可行性研究
Md. Asif Abbas, N. Hasan, Syed Md. Redwan Hasan
A country’s sustainable economy relies on the use of its advanced technologies in managing energy resources. Bangladesh is a blessed nation with natural resources to make its power sector a revolution, and is tremendously advancing its competency against the huge rising demand for electricity with planning to integrate renewable energy sources. With the geographical location and solar radiation profile, Bangladesh fits to renewable energy technologies. Concentrated Solar Power (CSP) in particular, a recent cutting-edge innovation with environmentally sustainable technology is becoming the most consistent in the Power-Tech-Revolution, which provides an extensive audit from the generation capacity to supply economy with the integration of thermal energy storage systems in RE framework. Gemasolar is such a pilot project in Spain, which successfully has remarked with the CSP technology. This study observes the feasibility of such technology in Bangladesh with its natural solar profile, with an economical, clean energy and technology perspective.
一个国家的可持续经济依赖于其在能源管理方面的先进技术的使用。孟加拉国是一个得天独厚的国家,拥有自然资源,使其电力部门发生革命,并且通过计划整合可再生能源,正在极大地提高其能力,以应对不断增长的电力需求。由于地理位置和太阳辐射分布,孟加拉国适合使用可再生能源技术。特别是聚光太阳能发电(CSP),一项具有环境可持续技术的最新前沿创新正在成为电力技术革命中最一致的技术,它提供了从发电能力到供应经济的广泛审计,并在可再生能源框架中集成了热能储存系统。Gemasolar在西班牙就是这样一个试点项目,它成功地利用了CSP技术。本研究从经济、清洁能源和技术的角度观察了这种技术在孟加拉国具有天然太阳能概况的可行性。
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引用次数: 2
Estimation of Aperture Antennas Near-Field with Mutual Coupling Consideration 考虑互耦合的孔径天线近场估计
Maxim A. Dubovitskiy, M. S. Mikhailov
This paper presents the results of a theoretical analysis of the antenna characteristics main dependences on the amplitude and discrete phase-type distributions in the near radiation zone of an aperture antenna. The relevance of near-field studying is confirmed by the need for effective estimation of parameters and signal resolution, which is possible due to the accurate determination of the amplitude and discrete phase-type distribution in the aperture antenna or antenna array. The scientific novelty of the obtained analytical dependences consists in the possibility of developing a strict and well-founded approach to the extended interferometric array analysis on the example of numerical calculation of the field structure in the Fresnel and near-zones.
本文从理论上分析了孔径天线近辐射区幅值分布和离散相位分布对天线特性的影响。由于孔径天线或天线阵列中振幅和离散相型分布的精确确定,需要有效地估计参数和信号分辨率,从而证实了近场研究的相关性。所获得的解析依赖关系的科学新颖性在于,以菲涅耳和近区场结构的数值计算为例,有可能发展出一种严格的、有充分根据的扩展干涉阵列分析方法。
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引用次数: 0
A Review of Extracting and Mining User Interest from Social Media Based on Personality 基于个性的社交媒体用户兴趣提取与挖掘综述
Marwa M. Alrehili, W. Yafooz
Social platforms such as Facebook, Twitter, Instagram, and YouTube have escalated the content published over the internet by the users. Such platforms are considered salient influencing the daily activities causing the various segmentations in the society. The availability of user-generated social media content offers the opportunity to create models capable of extracting and predicting user interests efficiently. Many literature studies attempt the extract user interests to obtain the linage and the co-relation between individuals. However, extracting implicit and future user interests is challenging in research. Therefore, the purpose of this paper is to review the existing methods, the efficiency of extracting and predicting user interests, and to highlight the limitations of the existing methods and techniques. This paper can be beneficial to many research and postgraduate students who focus on the topic related to user personality categorization and, text mining over social media.
Facebook、Twitter、Instagram和YouTube等社交平台已经升级了用户在互联网上发布的内容。这些平台被认为是影响日常活动的显著因素,造成了社会的各种细分。用户生成的社交媒体内容的可用性为创建能够有效提取和预测用户兴趣的模型提供了机会。许多文献研究试图提取用户兴趣,以获得个体之间的血缘关系和相互关系。然而,提取隐含的和未来的用户兴趣在研究中是具有挑战性的。因此,本文的目的是回顾现有的方法,提取和预测用户兴趣的效率,并突出现有方法和技术的局限性。这篇论文对许多研究和研究生来说是有益的,他们专注于与用户个性分类和社交媒体上的文本挖掘相关的主题。
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引用次数: 1
Research of partial discharge characteristics in XLPE-insulated cables with single and multiple defects 单缺陷和多缺陷交联聚乙烯绝缘电缆局部放电特性研究
D. Polyakov, I. V. Komarov, Amir B. Sarsembayev, K. I. Nikitin, U. V. Polyakova
This paper considers research on multiple partial discharge (PD) sources in a single XLPE-insulated cable sample. The electrical field was simulated in the field of the artificial defects of cables. Cable samples were prepared for experimental research. After that, artificial defects were created in them. PD measurements were performed from one to six cable artificial defects. Results showed similar phase-resolved PD patterns (PRPD). It is explained by the defects’ location in the field of the grounding electrode. The unexpected result is PD pulses form similarity. They have to differ because of the cable distributed-parameters line characteristics. However, the difference might be insignificant because of the small cable samples’ length. Besides, PD apparent charge and intensity also have no obvious dependence on defects’ amount. Therefore, multiple defects’ recognition is a complicated task. Probably, close defects’ location might complicate the recognition even in long cable lines.
本文考虑了在单个交联聚乙烯绝缘电缆样品中多个局部放电源的研究。对电缆人工缺陷场进行了电场模拟。制备了电缆样品进行实验研究。在那之后,人造缺陷被制造出来。PD测量从一到六个电缆人工缺陷进行。结果显示相似的相分辨PD模式(PRPD)。这可以用缺陷在接地电极磁场中的位置来解释。出乎意料的结果是PD脉冲形成相似性。由于电缆的分布参数线路特性,它们必须有所不同。然而,由于电缆样本的长度较小,差异可能不显著。此外,PD的视电荷和强度对缺陷的数量也没有明显的依赖性。因此,多重缺陷的识别是一项复杂的任务。可能,即使在长电缆线路中,接近缺陷的位置也会使识别复杂化。
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引用次数: 1
Solution of electric drive with a variable moment of inertia 带可变转动惯量的电力驱动的解决方案
V. Domanov, Dmitriy G. Murzakov, A. V. Domanov
A control system for an asynchronous motor is considered according to a simplified dual-power scheme, which allows implementing the holding mode. A block diagram of the electric drive is drawn up and its stability is evaluated. It is shown that in transient modes there is an oscillatory component caused by the synchronization moment. A correction device is proposed that allows damping vibrations. The analysis of the control system when changing the moment of inertia of the electric drive. To reduce the sensitivity of the control system to variations of this parameter, it is proposed to use a special sensor that allows using the correcting circuit to maintain the dynamic characteristics of the system. The analysis of the influence of restrictions in the chain of the corrective link. The results can be used in the synthesis of similar systems with variations in the moment of inertia.
根据简化的双电源方案考虑异步电动机的控制系统,该方案允许实现保持模式。绘制了电传动的框图,并对其稳定性进行了评价。结果表明,在瞬态模式中存在由同步力矩引起的振荡分量。提出了一种阻尼振动的校正装置。分析了改变电驱动转动惯量时控制系统的特性。为了降低控制系统对该参数变化的敏感性,建议使用一种特殊的传感器,该传感器允许使用校正电路来保持系统的动态特性。修正环节链中约束条件的影响分析。所得结果可用于具有转动惯量变化的类似系统的综合。
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引用次数: 0
Electrical Safety Assessment in Distribution Networks Considering The Cable Conducting Sheaths Currents 考虑电缆导电护套电流的配电网电气安全评价
Ksenia V. Kolesnikova, Y. Gusev, N. Smotrov, G. Cho, A. Yuzhanin
The use of low-resistance neutral grounding increases the stress voltage of grounded elements of transformer substation equipment. If the stress voltage is calculated while accounting for the spreading of single-phase earth-fault currents through conductive sheaths and cable shields, then the threshold limit values of capacitive currents will be higher than the values if assumed that the current only spreads through the grounding device of a single substation. The purpose of this study was to estimate the threshold limit values of capacitive current in distribution networks with low-resistance neutral grounding for stress voltage. Stress voltage was determined by the voltage on the ground loop with a resistance of grounding devices 0.5 Ohm. Values of voltages for different distances of earth faults from power centers and capacitive currents were obtained from 200 to 1000 A.
采用低阻中性点接地,增加了变电站设备接地元件的应力电压。如果在计算应力电压时考虑单相接地故障电流通过导电护套和电缆屏蔽层传播,则电容电流的阈值将高于假设电流仅通过单个变电站接地装置传播的阈值。本研究的目的是估计低阻中性点接地配电网在应力电压下的容性电流阈值。应力电压由接地回路上具有0.5欧姆电阻的电压确定。在200 ~ 1000 A范围内,得到了接地故障距电力中心不同距离的电压值和容性电流。
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引用次数: 0
The water and air distribution law analysis in natural draft cooling towers 自然通风冷却塔的水、风分布规律分析
A. Badriev, I. Makarova
This work deals with the study of water and air distribution irregularity in an industrial natural draft cooling tower (NDCT). Statistical histograms of water and air flow distribution in the NDCT are made, a significant degree of water and air irregularity has been established and a general criterion for the dimensionless water and air distribution has been introduced. We have analyzed the flows’ distribution law and have found that the statistical data of water and air flow in natural draft cooling towers adhere to the normal distribution law. The distribution functions of the dimensionless of water concentration and air velocity are obtained. A technical and economic calculation of the irregularity flows influence on the thermal power plant fuel consumption has been carried out. The knowledge about the law of the water and air concentration distribution is necessary for more accurate calculations in the cooling towers design and operation.
本文研究了工业自然通风冷却塔(NDCT)内的水和空气分布不均匀性。绘制了NDCT中水流和气流分布的统计直方图,建立了显著程度的水流和气流不均匀性,并引入了无因次水流和气流分布的一般判据。通过对流量分布规律的分析,发现自然通风冷却塔内的水气流量统计数据均服从正态分布规律。得到了水浓度和风速的无因次分布函数。对不均匀流动对火电厂燃料消耗的影响进行了技术经济计算。在冷却塔的设计和运行中,了解水和空气的浓度分布规律是进行准确计算所必需的。
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引用次数: 2
期刊
2021 3rd International Youth Conference on Radio Electronics, Electrical and Power Engineering (REEPE)
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