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A novel transient rotor current control scheme of a doubly-fed induction generator equipped with superconducting magnetic energy storage for voltage and frequency support

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Chinese Physics B 2015年第7期24卷 52-63页

作者：沈阳武柯德平孙元章 daniel kirschen 王轶申胡元朝 School of Electrical Engineering Wuhan University Department of Electrical Engineering University of Washington

A novel transient rotor current control scheme is proposed in this paper for a doubly-fed induction generator（DFIG）equipped with a superconducting magnetic energy storage（SMES） device to enhance its transient voltage and frequency support capacity during grid faults. The SMES connected to the DC-link capacitor of the DFIG is controlled to regulate the transient dc-link voltage so that the whole capacity of the grid side converter（GSC） is dedicated to injecting reactive power to the grid for the transient voltage support. However, the rotor-side converter（RSC） has different control tasks for different periods of the grid fault. Firstly, for Period I, the RSC injects the demagnetizing current to ensure the controllability of the rotor voltage. Then, since the dc stator flux degenerates rapidly in Period II, the required demagnetizing current is low in Period II and the RSC uses the spare capacity to additionally generate the reactive（priority） and active current so that the transient voltage capability is corroborated and the DFIG also positively responds to the system frequency dynamic at the earliest time. Finally, a small amount of demagnetizing current is provided after the fault clearance. Most of the RSC capacity is used to inject the active current to further support the frequency recovery of the system. Simulations are carried out on a simple power system with a wind farm. Comparisons with other commonly used control methods are performed to validate the proposed control method.

关键词： doubly-fed induction generator transient rotor current control superconducting magnetic energy storage voltage support

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低碳电力调度方式及其决策模型

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电力系统自动化 2010年第12期34卷 18-23页

作者：陈启鑫康重庆夏清 daniel kirschen 清华大学电机系电力系统国家重点实验室北京市100084 The University of Manchester

低碳要素的引入将为传统的电力调度方法带来新问题和新挑战,在考虑安全性和经济性之外,还应进一步关注电力系统运行中的CO2排放。文中深入剖析了低碳电力调度的提出背景和内涵,定义了科学、高效的低碳电力调度方式;分析各类低碳电源的... 详细信息

低碳要素的引入将为传统的电力调度方法带来新问题和新挑战,在考虑安全性和经济性之外,还应进一步关注电力系统运行中的CO2排放。文中深入剖析了低碳电力调度的提出背景和内涵,定义了科学、高效的低碳电力调度方式;分析各类低碳电源的技术特性,建立了近零碳排放电源、普通化石燃料类电源和碳捕集电厂3类不同电源的电碳调度特性;将CO2排放作为一类可调度资源,在综合考虑低碳电力技术、碳成本和碳约束等要素的基础上,建立了低碳电力调度决策的初步模型,以协调电力调度中的"电平衡"与"碳平衡"。基于实际算例,分析了各类低碳要素的引入对于最优发电计划决策的影响。

关键词：低碳电力调度电碳调度特性碳捕集电厂日发电计划

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低碳多能源系统的研究框架及展望

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中国电机工程学报 2017年第14期37卷 4060-4069页

作者：程耀华张宁康重庆 daniel kirschen 张宝森电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系) 北京市海淀区100084 华盛顿大学美国华盛顿州西雅图市90876

多能源系统是指电力系统、热力系统以及天然气系统等多种类型的能源系统在不同环节、不同时空尺度进行耦合而组成的综合能源系统。相比不同能源系统之间分立运行,多种类型能源系统的耦合为能源系统提高经济性、促进节能减排提供了广阔... 详细信息

多能源系统是指电力系统、热力系统以及天然气系统等多种类型的能源系统在不同环节、不同时空尺度进行耦合而组成的综合能源系统。相比不同能源系统之间分立运行,多种类型能源系统的耦合为能源系统提高经济性、促进节能减排提供了广阔的优化空间。该文首先从促进能源的综合利用效率与促进可再生能源的消纳两个方面出发,分析了多能源系统对低碳化发展的促进作用。然后分析了低碳发展模式下多能源系统需要研究的问题,建立了低碳多能源系统的整体研究框架。最后,分别从多能源系统的低碳分析、多能源系统的低碳规划与运行、碳交易市场等3个层面对低碳多能源系统的研究进行了展望,详细阐述了未来的主要研究方向。

关键词：低碳经济多能源系统碳排放可再生能源规划与运行碳交易市场

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联营电力市场中需求侧的直接参与(英文)

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电网技术 2007年第20期31卷 7-15页

作者： Chua-Liang Su daniel kirschen 曼彻斯特大学电气与电子工程学院

在现有的允许需求侧竞标的日前联营市场中,每当某个时段的市场清算电价高于投标报价时,需求侧的兆瓦级购电竞标就被拒绝。由于用户不参与通过削减供电量来牟利的商业运作,因此未得到满足的用户需求只能从平衡市场中在更接近于预期用电... 详细信息

在现有的允许需求侧竞标的日前联营市场中,每当某个时段的市场清算电价高于投标报价时,需求侧的兆瓦级购电竞标就被拒绝。由于用户不参与通过削减供电量来牟利的商业运作,因此未得到满足的用户需求只能从平衡市场中在更接近于预期用电的时段中获得。这就使用户遭受更大的不能以所希望的价格来满足其对电能的需要的风险。文章介绍了一种新的市场概念,它能在日前市场对需求侧的竞标者关闭后,以合并拍卖规则中需求移动机制的方法来降低其需求不平衡的风险。

关键词：市场清算工具最大社会福利允许需求侧参与需求移动基于联营的电力市场完全竞争混合整数线性规划

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电网规划方案的适应性与风险评估

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电力系统保护与控制 2008年第23期36卷 1-7,22页

作者：杨高峰康重庆 Furong Li daniel kirschen 清华大学电机系电力系统国家重点实验室北京100084 重庆市电力公司杨家坪供电局重庆400051 Department of Electronic ＆ Electrical Engineering University of Bath Bath BA2 7AY UK School of Electrical and Electronic Engineering University of Manchester Manchester M60 1QD UK

电力规划方案的适应性与风险评估,是电力规划工作中一项极其重要的内容。在市场环境下,电网规划方案所存在的风险及其对不确定因素的适应性,是评估工作面临的新挑战。鉴于电力系统以及电力市场中诸多不确定性因素的影响,基于电力市场模... 详细信息

电力规划方案的适应性与风险评估,是电力规划工作中一项极其重要的内容。在市场环境下,电网规划方案所存在的风险及其对不确定因素的适应性,是评估工作面临的新挑战。鉴于电力系统以及电力市场中诸多不确定性因素的影响,基于电力市场模拟的原理,将蒙特卡罗模拟引入到电网规划方案的适应性与风险评估之中,并详细描述了在电力市场环境中对不确定性因素进行蒙特卡罗模拟并应用于市场模拟和生产模拟的基本思想、方法、流程。主要围绕负荷与电价这两个不确定性因素展开,将整体思路应用于江苏省电网规划方案的分析之中,结合华东区域电力市场运营规则,进行了2010年电网规划的评估。实际应用表明,所提出的评估方法能够很好地突出市场中的关键因素,模拟市场中的极端情况,为市场环境下电网规划方案的适应性与风险评估提供了一个切实可行的方法和思路,具有较大的实用价值。

关键词：电网规划适应性风险评估市场模拟蒙特卡罗模拟

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Testing and modelling of transient adhesion phenomena in rolling-sliding contacts

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Friction 2024年第5期12卷 1016-1027页

作者： daniel KVARDA Alexander MEIERHOFER Klaus SIX Faculty of Mechanical Engineering Brno University of TechnologyBrno61669Czech Republic Virtual Vehicle Research GmbH Graz8010Austria

Transient adhesion effects in rolling–sliding contacts influence all aspects of train–track *** is of high importance specifically when these effects result in critically low adhesion,which poses a risk to traction and braking of railway *** study presents a model that can replicate the transient changes of the coefficient of adhesion with tested water and solid particle *** experimental data for the model are measured using a commercial ball-on-disc *** experimental results showed a liquid reservoir in front of the contact area that slowly reduces in *** observation was used in the modelling approach to divide the calculation into two stages where the reservoir is present and when it *** model was able to reproduce the occurrence of low adhesion region seen in experimental results with different particle concentrations.

关键词： coefficient of adhesion tribology transient effects wheel-rail contact

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Energy model based on solar potential and the production of electrical energy through living plants’photosynthesis

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Clean Energy 2024年第3期8卷 116-126页

作者： Raymond daniel Rodriguez Martinez Department of Industrial Production Faculty of EngineeringUniversidad Metropolitana1073 CaracasVenezuela

Developing a sustainable energy model is imperative considering the current trend towards decarbonizing sectors *** this purpose,Venezuela was used as a reference to propose an energy model focused on taking advantage of plant photosynthesis through microbial-vegetable fuel cells together with an agro-photovoltaic system to enhance energy and agricultural *** production from the cells was estimated using an average power density of 264 mW/m^(2) over 4%of the areas destined for crops in the entire Venezuelan region,obtaining an annual production of 19.889 GWh/*** contrast,the energy production of the agro-photovoltaic system was modelled using PVsyst software on 50%of the area used for the cells distributed throughout the states of Anzoátegui,Guárico,Monagas and Portuguesa according to their meteorological conditions,solar irradiation and agricultural activity,resulting in 3703417 GWh/*** resulting whole system proved to be able to cover>10 times the installed electricity generation capacity at a national level and,together with the tremendous scalability of the microbial fuel cells,it shows that Venezuela has a high potential for the production and distribution of clean energy.

关键词： ecosystems microbial fuel cell microorganisms renewable sustainability

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Beyond the code:the role of histone methylation in cancer resistance and therapy

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Signal Transduction and Targeted Therapy 2024年第7期9卷 2837-2839页

作者： daniel Noerenberg Frederik Damm Charité–Universitätsmedizin Berlin corporate member of Freie Universität BerlinHumboldt Universität zu Berlinand Berlin Institute of HealthDepartment of HematologyOncologyand Cancer ImmunologyBerlinGermany German Cancer Consortium(Deutsches Konsortium für Translationale Krebsforschung DKTK)Partner SiteBerlinGermany

In a recently published paper in Nature,Yamagishi et *** a comprehensive exploration on the mechanistic basis and subsequent emergence of resistance of targeting histone H3 lysine trimethylation(H3K27me3)using the EZH... 详细信息

关键词： EZH2 resistance

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Plant-microbial fuel cell for electrical generation through living plants: an internal resistance insight into the plant species used

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Clean Energy 2024年第5期8卷 45-53页

作者： Raymond daniel Rodriguez Martinez Department of Industrial Production Faculty of EngineeringUniversidad Metropolitana1073 CaracasVenezuela

Climate change is a global threat,the presence of which has encouraged the development and implementation of renewable energies,including plant–microbial fuel cells,which could generate 6629568–33147840 MWh per year due to their large-scale *** of the main challenges associated with microbial cells is internal resistance—a parameter whose magnitude is influenced by sev-eral *** the case of plant–microbial fuel cells,adding a plant positively affects the mitigation of internal ***,the species employed is expected to play an important *** the present study,the objective was to determine as a general reference the internal resistance of cells using various plant species,among which were tomato(Solanum lycopersicum),black beans(Phaseolus vulgaris),aloe vera(Aloe vera),corn(Zea mays),and moss(Dicranidae).For this purpose,an experimental procedure was carried out to compare the manual voltage measurements with a free cell concerning the voltage obtained by adding an external resistor in *** internal resistance values were determined as a function of the measured voltage,obtaining 177,179,175,324,and 233 kΩfor aloe vera,corn,tomato,black beans,and moss,*** this,it was shown that the roots of the plants represent an essen-tial addition to the internal resistance of the cell in the short *** contrast,plants with a C4 photosynthetic metabolism are more favourable,while C3 plants can also benefit from internal resistance during a more extended period of rhizodeposition.

关键词： climate change energy microorganism renewable source voltage

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Assessment of scale interactions associated with wake meandering using bispectral analysis methodologies

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Theoretical & Applied Mechanics Letters 2024年第2期14卷 65-75页

作者： Dinesh Kumar Kinjangi daniel Foti Department of Mechanical Engineering University of MemphisMemphisTennesseeUSA

Large atmospheric boundary layer fluctuations and smaller turbine-scale vorticity dynamics are separately hypothesized to initiate the wind turbine wake meandering phenomenon,a coherent,dynamic,turbine-scale oscillation of the far *** interactions,the mechanism of energy transfers between scales,manifest as triples of wavenumbers or frequencies and can be characterized through bispectral *** bispectrum,which correlates the two frequencies to their sum,is calculated by two recently developed multi-dimensional modal decomposition methods:scale-specific energy transfer method and bispectral mode ***-eddy simulation of a utility-scale wind turbine in an atmospheric boundary layer with a broad range of large length-scales is used to acquire instantaneous velocity *** bispectrum from both methods identifies prominent upwind and wake meandering interactions that create a broad range of energy scales including the wake meandering *** coherent kinetic energy associated with the interactions shows strong correlation between upwind scales and wake meandering.

关键词： Wind turbine wake Mode decomposition Bispectral analysis

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