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AN INTELLIGENT TECHNIQUE FOR THE HEALTH ASSESSMENT OF POWER TRANSFORMER USING THERMAL IMAGING 一种基于热成像的电力变压器健康评估智能技术
IF 0.5 Q3 Mathematics Pub Date : 2021-01-01 DOI: 10.2316/j.2021.203-0235
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引用次数: 0
RESEARCH ON RUL OF LI-ION BATTERY BASED ON IMPROVED AR-PF MODEL 基于改进ar-pf模型的锂离子电池特性研究
IF 0.5 Q3 Mathematics Pub Date : 2021-01-01 DOI: 10.2316/j.2021.203-0246
Mingze Yin
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引用次数: 0
DYNAMIC PERFORMANCE ENHANCEMENT OF WIND PENETRATED POWER SYSTEM USING SMES AS VIRTUAL SYNCHRONOUS GENERATOR 利用smes作为虚拟同步发电机增强风电系统动态性能
IF 0.5 Q3 Mathematics Pub Date : 2021-01-01 DOI: 10.2316/J.2021.203-0271
Abdul Waheed Kumar, M. Mufti, M. Y. Zargar
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引用次数: 0
Controlled Fusion: Magnetic and Inertial, Promises and Pitfalls 受控核聚变:磁性与惯性,希望与陷阱
IF 0.5 Q3 Mathematics Pub Date : 2020-12-22 DOI: 10.11648/J.EPES.20200906.12
K. Touryan
As with biomass, hydro, solar and wind power, fusion power can also generate clean energy, using deuterium, an isotope of hydrogen, abundantly available in our oceans. Our sun uses hydrogen in a fusion process to generate power. It has been demonstrated that fusion power can be generated on earth, under carefully controlled conditions using deuterium and tritium instead of hydrogen. There are two fundamental approaches to controlled fusion: magnetic confinement fusion (MCF) first proposed at Princeton University in 1951, and inertial confinement fusion (ICF) that followed shortly thereafter, first proposed at the Lawrence Livermore Laboratories in 1970. Progress made on magnetic fusion led to the planning and construction of ITER (International Thermonuclear Experimental Reactor), expected to be completed in 2035. In this article, we explain the processes necessary to generate fusion power through MCF and ICF. Unlike nuclear power, as a practical means to generate electricity, controlled fusion has presented the technical/scientific community with a plethora of very difficult challenges. It is only recently, after decades of intense research in many laboratories worldwide, that we have begun to see devices being built on a fusion reactor scale and hence the design of ITER. The challenges are many but require patience and perseverance.
与生物质能、水力、太阳能和风能一样,核聚变发电也可以利用氘(氢的一种同位素)产生清洁能源,氘在我们的海洋中储量丰富。我们的太阳在聚变过程中使用氢来发电。已经证明,在地球上,在严格控制的条件下,用氘和氚代替氢可以产生核聚变。控制核聚变有两种基本方法:1951年普林斯顿大学首先提出的磁约束核聚变(MCF),以及随后不久由劳伦斯利弗莫尔实验室于1970年首次提出的惯性约束核聚变(ICF)。在磁聚变方面取得的进展导致了ITER(国际热核实验反应堆)的规划和建设,预计将于2035年完成。在本文中,我们解释了通过MCF和ICF产生核聚变功率所需的过程。与核能不同,作为一种实用的发电手段,受控核聚变给技术/科学界带来了大量非常困难的挑战。直到最近,在世界各地的许多实验室进行了数十年的深入研究之后,我们才开始看到以聚变反应堆规模建造的设备,并因此设计出了ITER。挑战很多,但需要耐心和毅力。
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引用次数: 0
Predictive Direct Power Control of Doubly Fed Induction Generators to Reduce the Power Ripple During the Grid Synchronization 双馈感应发电机预测直接功率控制以减小电网同步时的功率纹波
IF 0.5 Q3 Mathematics Pub Date : 2020-12-16 DOI: 10.11648/J.EPES.20200906.11
Ghazaleh Sarfi, M. Kalantar
This paper presents a new method of predicting power based on predictive direct power control. This method reduces power ripple in a doubly fed induction generator, which makes it possible to have a smoother synchronization with the grid in low constant frequency switching. To achieve fast and smooth grid synchronization without any over current, the difference between the measure, frequency, and the phase of the stator voltage and the grid voltage should be minimized. This condition can be achieved by minimizing the error between active and reactive virtual power and their references. By predicting the virtual active and reactive power behavior and choosing different active voltage vectors and using each of them at different times among each period time, the best switching of the rotor side converter in doubly fed induction generator to have a smoother condition can be chosen. In this paper, a 15kw generator is simulated by the classic method which is direct power control, and this new method, predictive direct power control, and it will be shown how much the new method reduces the power ripple to have a smoother synchronization that doesn’t cause mechanical or electrical pressure for none of the grid and the doubly fed induction generator.
提出了一种基于预测直接功率控制的功率预测新方法。该方法减小了双馈感应发电机的功率纹波,使低恒频开关与电网的同步更加平滑。为了实现快速平稳的电网同步而不产生过电流,定子电压的测量值、频率和相位与电网电压之间的差应最小化。这一条件可以通过最小化有功和无功虚功率与其参考之间的误差来实现。通过对虚拟有功和无功行为的预测,选择不同的有功电压矢量,并在每个周期时间内的不同时间使用,可以选择双馈异步发电机转子侧变流器的最佳开关,使其处于更平稳的状态。本文以一台15kw发电机为例,分别采用经典的直接功率控制方法和预测直接功率控制方法对其进行了仿真,并展示了新方法对功率纹波的减小程度,从而实现了对电网和双馈感应发电机均不产生机械或电气压力的平滑同步。
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引用次数: 0
Site Selection and Design of Mini Hydropower Plant for Rural Electrification in Keber River 克贝尔河农村电气化小型水电厂选址与设计
IF 0.5 Q3 Mathematics Pub Date : 2020-12-16 DOI: 10.11648/j.epes.20200905.12
Shimelash Molla Kassaye, Tolossa Negassa Ebissa, Bahiru Geleta Gutema, Gutema Tamiru Gurmesa
Nearly two billion peoples in developing countries do not have access to electricity service. Renewable energy resources are a best option for rural electrification in a country like Ethiopia where electric light is a luxury enjoyed only by a few peoples. Nowadays, only around fifteen percent of the populations living in urban and semi urban areas are connected to the national grid. The remaining populations are living in scattered rural villages and have very remote chances to get electricity from the grid. The only realistic approach to electrify the rural areas seems therefore to be the off grid or self-contained system. The contributions of renewable sources of energy like micro/mini or Pico hydro power, to rural electrification are minimal still. The main objective of the present study was to identify the potential of mini hydropower site and proposing a plant for rural electrification in Keber River around Tobacha kebele. So in the research the study starts from the estimation of the design discharge by analyzing of the stream flow using the flow duration curve. For estimating the design discharge the available discharge in the river, the population demand and some guidelines for development of mini hydropower were used. So using the above constraints the power of 120kw was designed for a 300 households, 1 clinic and 2 elementary schools. Besides estimating the power, the present study focuses on design of civil structures and selection of electromechanical components. Generally the result of the study shows that construction of mini hydropower was feasible in the project site.
发展中国家有近20亿人无法获得电力服务。在埃塞俄比亚这样的国家,只有少数人能享受到电灯的奢侈品,可再生能源是农村电气化的最佳选择。如今,只有大约15%生活在城市和半城市地区的人口连接到国家电网。剩下的人口生活在分散的农村村庄,很难从电网上获得电力。因此,使农村地区通电的唯一现实方法似乎是离网或自给自足的系统。可再生能源,如微型或微型水电,对农村电气化的贡献仍然很小。本研究的主要目的是确定小型水力发电站的潜力,并建议在Tobacha kebele附近的Keber河建立一个农村电气化工厂。因此在本研究中,从利用流量持续时间曲线对水流进行分析来估算设计流量入手。在估算设计流量时,采用了江源有效流量、人口需求和小型水电开发指导原则。因此,利用上述限制,120千瓦的功率被设计为300个家庭,1个诊所和2所小学。除了功率估算外,本研究还着重于土建结构的设计和机电元件的选择。总体研究结果表明,在项目区建设小型水电是可行的。
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引用次数: 0
Multi-point Analysis of Economic, Environmental, Static and Dynamic Dispatching of an Energy Mix in the Presence of STATCOM by the U-NSGA-III Genetic Algorithm 基于U-NSGA-III遗传算法的STATCOM存在下能源组合经济、环境、静态和动态调度多点分析
IF 0.5 Q3 Mathematics Pub Date : 2020-09-22 DOI: 10.11648/J.EPES.20200905.11
Arouna Oloulade, A. M. Imano, F. Fifatin, Auriole Prudence Omoremy, Amédée Ganye, Ramanou Badarou, A. Viannou, Mahamoud Tanimomon
In an energy environment with multiple production sources, operators are generally confronted with the optimal choice of sources which minimizes polluting gas emissions, losses and marginal production costs while meeting the contractual requirements for maintaining voltage in the ranges required. The present work consisted of optimizing an energy mix in the presence of multi-STATCOM in an interconnected network. Indeed, the (DEE) is a concrete real time problem in electrical energy production systems. This paper shows the impact of STATCOM on static DEE (DEES) and on dynamic DEE (DEED) using the modern genetic algorithm of type U-NSGA-III, which is based on non-dominance sorting. The optimal positioning of two STATCOMs in the application network associated with dynamic dispatching has contributed to the reduction of the total production cost, toxic gas emissions, active losses and then to the improvement of the voltage profiles and the transit of power in the branches. It is observed that the combination of DEED with the optimal positioning of FACTS in an interconnected network constitutes an efficient technico-ecological means to act in the direction of reduction on the triplet consisting of (gas emissions, losses, production cost). The relevance of the results obtained compared to the real case of operating the CEB's interconnected network, justifies the performance of the algorithmic tools developed in the context of this work.
在一个有多种生产源的能源环境中,作业者通常面临着选择最优的生产源,既能最大限度地减少污染气体的排放、损失和边际生产成本,又能满足合同要求,将电压保持在所需范围内。目前的工作包括在互联网络中存在多个statcom的情况下优化能源组合。事实上,DEE是电力生产系统中一个具体的实时问题。本文采用基于非优势排序的U-NSGA-III型现代遗传算法,分析了STATCOM对静态DEE (DEES)和动态DEE (DEED)的影响。两个statcom在与动态调度相关的应用网络中的最佳定位有助于降低总生产成本,有毒气体排放,有功损耗,从而改善电压分布和分支中的电力传输。可以观察到,将DEED与FACTS在相互连接的网络中的最佳定位相结合,构成了一种有效的技术生态手段,可以朝着减少(气体排放、损失、生产成本)这三要素的方向采取行动。与操作CEB互连网络的实际情况相比,获得的结果的相关性证明了在本工作背景下开发的算法工具的性能。
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引用次数: 0
Power Electronics Converter Application in Traction Power Supply System 电力电子变换器在牵引供电系统中的应用
IF 0.5 Q3 Mathematics Pub Date : 2020-08-26 DOI: 10.11648/j.epes.20200904.12
Asegid Kebede, G. Worku
The electrified railway systems have been spreading all over the world. In big cities, metro or light rail transit railway networks have been constructed extensively. Expansion of this enormous dynamic electric load has been created huge amount of stress on the power grid. Generally, the speed drives, power conversion equipment or frequency converters inject harmonic in to railways power supply system. These harmonics seriously disturbs other electrical systems or generate a high frequency electromagnetic fields in neighboring electrical equipment as well as traction network signaling system. However, new developments in power electronic converter enable efficient and flexible conditioning of electrical energy in the application of railway power system. Power electronics, already previously being a pioneer for progress of traction vehicles, brought forth an ultimate standardization of the traction power supply system. Today, the spectrum of power electronic converters application in the traction system spread in many areas including power electronics based traction transformers, auxiliary power supply systems, rectification, integration of regenerative braking, reactive power compensation and voltage regulation and traction motor controls. This paper reviews the applications of semiconductor based power electronic devices in electrified railway system and illustrates some major application areas.
电气化铁路系统已遍布世界各地。在大城市,地铁或轻轨交通路网已广泛建设。这种巨大的动态电力负荷的膨胀给电网带来了巨大的压力。铁路供电系统一般由调速装置、功率转换设备或变频器注入谐波。这些谐波严重干扰其他电气系统或在相邻电气设备以及牵引网络信号系统中产生高频电磁场。然而,电力电子变换器的新发展使电能的高效灵活调节在铁路电力系统中的应用成为可能。电力电子技术已经成为牵引车辆发展的先驱,它带来了牵引供电系统的最终标准化。如今,电力电子变流器在牵引系统中的应用范围已扩展到许多领域,包括基于电力电子的牵引变压器、辅助供电系统、整流、再生制动集成、无功补偿和电压调节以及牵引电机控制。本文综述了基于半导体的电力电子器件在电气化铁路系统中的应用,并举例说明了一些主要的应用领域。
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引用次数: 3
Performance Comparison of Cost Efficient Natural Dye Sensitized Solar Cell 低成本天然染料敏化太阳能电池的性能比较
IF 0.5 Q3 Mathematics Pub Date : 2020-08-20 DOI: 10.11648/j.epes.20200904.11
Afshana Afroj Bristi, S. M. Jahadun-Nobi, Nurul Abser, M. Hassan
Dye-sensitized solar cells (DSSCs) enticed the attention in photovoltaic design due to their unique features of ease of fabrication, low-cost materials, tunable color, and flexibility. In this work, we studied the performance of a low cost dye-sensitized solar cell structure with several natural dyes as a sensitizer. Titanium dioxide (TiO2) was used as the semiconducting layer. The TiO2 film was fabricated on Florine doped Tin Oxide (FTO) glass plate and was annealed and sintered for an hour at 450°C temperature to create a mesoporous layer. To reduce the manufacturing cost, we used Carbon black instead of Platinum (Pt) as a counter electrode. Carbon black provides excellent stability and shows high catalytic ability along with its low cost as the counter electrode in the DSSCs. Eight different dyes have been extracted and purified by Silica gel column chromatography to use in the DSSCs. UV-Visible absorption spectroscopy and fluorescence spectroscopy has been done to measure the absorbance coefficient and fluorescence coefficient of each of the cells. The cells with an additional peak in the fluorescence spectra showed much better electrical performance compared with others. Among the fabricated DSSCs, the Curcuma longa based DSSC gives the highest open-circuit voltage of 0.5959 V and short circuit current density of 1.06 mA/cm2. The study also indicates that the dyes with a peak at 380 nm to 400 nm wavelength at fluorescence spectrum has better photovoltaic performance rather with a moderate absorbance spectrum.
染料敏化太阳能电池(DSSCs)由于其易于制造、材料成本低、颜色可调和灵活性等独特的特点,在光伏设计中引起了人们的关注。在这项工作中,我们研究了以几种天然染料作为敏化剂的低成本染料敏化太阳能电池结构的性能。采用二氧化钛(TiO2)作为半导体层。在氟掺杂氧化锡(FTO)玻璃板上制备TiO2薄膜,在450℃下退火烧结1小时,形成介孔层。为了降低制造成本,我们使用炭黑代替铂(Pt)作为对电极。作为DSSCs的对电极,炭黑具有优良的稳定性和较高的催化性能,且成本较低。用硅胶柱层析法提取和纯化了8种不同的染料用于DSSCs。利用紫外-可见吸收光谱和荧光光谱测定了各细胞的吸光度系数和荧光系数。荧光光谱中有一个额外峰的细胞比其他细胞表现出更好的电学性能。其中,姜黄基DSSC的开路电压最高,为0.5959 V,短路电流密度为1.06 mA/cm2。研究还表明,荧光光谱峰在380 nm ~ 400 nm处的染料具有较好的光伏性能,而吸光度中等的染料具有较好的光伏性能。
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引用次数: 0
Reliability Assessment and Study the Effect of Substation Feeder Length on Failure Rate and Reliability Indices 可靠性评估及变电站馈线长度对故障率和可靠性指标的影响研究
IF 0.5 Q3 Mathematics Pub Date : 2020-08-17 DOI: 10.11648/j.epes.20200903.11
M. Teshome, Fsaha Mabrahtu
Today, utilities are trying to maximize system reliability, improve efficiency, and reduce costs by using protection system, distributed generation system, by reconfiguring the feeder, by connecting the end of feeder to other substation and so on. However, when it tries to use some techniques (reconfiguring the feeder, connecting the end of the feeder to another substation); the techniques have positive and negative impact on reliability improvement. The substation which is taken in this paper has the System Average Interruption Frequency Index (SAIFI) and System Average Interruption Duration Index (SAIDI) is 521.46 interruptions per customer per year and 446.82 hours per customer per year respectively. The historical outage interruption data of the years of 2016-2018 has been used as a base year. The study has evaluated the new substation to improve the system reliability. The simulation results have been done with the help of Electrical Transient Analysis Program (ETAP 12.6) software. In this paper includes improvement of the system reliability of the feeder is supplied from two substations or new substation should be connected at the end of the feeder. Due to the new substation, the length of the feeder will vary, and the variation of the feeder has significant effect on power reliability. The value of SAIFI and SAIDI after the new substation connected is 169 and 96 respectively. Since the new substation has negative impact, the value of indices is not reduced more.
今天,公用事业公司正试图最大限度地提高系统可靠性,提高效率,并通过使用保护系统,分布式发电系统,通过重新配置馈线,通过将馈线末端连接到其他变电站等方式降低成本。然而,当它试图使用一些技术(重新配置馈线,将馈线的末端连接到另一个变电站);这些技术对可靠性的提高既有积极的影响,也有消极的影响。本文所采用的变电站系统平均中断频率指数(SAIFI)和系统平均中断持续时间指数(SAIDI)分别为521.46次/客户/年和446.82小时/客户/年。以2016-2018年的历史停电中断数据为基准年。为提高系统可靠性,对新建变电站进行了评估。利用电瞬变分析软件(ETAP 12.6)进行了仿真计算。本文包括了馈线由两个变电站供电或在馈线末端应连接新变电站时系统可靠性的提高。由于新建变电站,馈线长度会发生变化,馈线长度的变化对供电可靠性有重要影响。新变电站并网后SAIFI值为169,SAIDI值为96。由于新建变电站有负面影响,各项指标的数值没有进一步降低。
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引用次数: 0
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International Journal of Power and Energy Systems
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