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Three-phase fault direction identification method for outgoing transmission line of DFIG-based wind farms

Journal of Modern Power Systems and Clean Energy 2019年第5期7卷 1155-1164页

作者： Zhanfeng FAN Guobing SONG Xiaoning KANG Jisi TANG Xiaobo WANG Xi’an Jiaotong University Xi’anChina State Grid Beijing Electric Power Company BeijingChina State Grid Shanxi Maintenance Company TaiyuanChina

Doubly-fed induction generator(DFIG)-based wind farm has the characteristic of transient fault with low voltage ride through(LVRT)capability.A new three-phase fault direction identification method for the outgoing transmission line of the wind farm is *** ability of the new directional relay to differentiate between a three-phase fault in one direction or the other is obtained by using the increment of phase angle difference between the memory voltage signal and the fault current signal within a certain time,and using the amplitude variation of the fault *** can be inferred that the fault current is supplied by the wind farm whether the phase angle differs or the current amplitude varies *** fault locations at the outgoing transmission line have been simulated by PSCAD/EMTDC to evaluate the reliability and sensitivity of the proposed *** show that the new directional relay is of faster response when a three-phase fault occurs at the outgoing transmission line of a DFIG-based wind farm.

关键词： Wind farm Doubly-fed induction generator(DFIG) Directional relay outgoing transmission line

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Unit 3 I'm more outgoing than my sister

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时代英语（初中） 2022年第5期 27-33,2,8-9页

听下面一段对话,完成表格。对话读两遍。根据首字母及句意补全单词。*** sister is shy,but I am o__.*** is smart but not very h__,so he can’t get high grades.

关键词： sister smart outgoing

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Unit 3 I’m more outgoing than my sister

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时代英语（初中） 2018年第5期 24-29,77页

重点知识园地重点单词*** adj.&pron.两个;两个都Both the answers are right.两个答案都对。Both of them are interested in English.他们两个都对英语感兴趣。可构成both... and...结构,意为'不仅……而且……'。可连接两个并列的成... 详细信息

重点知识园地重点单词*** adj.&pron.两个;两个都Both the answers are right.两个答案都对。Both of them are interested in English.他们两个都对英语感兴趣。可构成both... and...结构,意为'不仅……而且……'。可连接两个并列的成分,若连接两个并列的主语。

关键词：形容词一般疑问句 Unit 3 I’m more outgoing than my sister 完成句子同义句补全对话阅读理解

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Slow Retrial Asymptotics for a Single Server Queue with Two-Way Communication and Markov Modulated Poisson

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Journal of Systems Science and Systems Engineering 2019年第2期28卷 181-193页

作者： Anatoly Nazarov Tuan Phung-Duc Svetlana Paul Institute of Applied Mathematics and Computer Science National Research Tomsk State University 36 Lenina ave. 634050 Tomsk Russian Federation Faculty of Engineering Information and Systems University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305-8573 Japan

In this paper, we consider an MMPP/M/1/1 retrial queue where incoming fresh calls arrive at the server according to a Markov modulated Poisson process (MMPP). Upon arrival, an incoming call either occupies the server if it is idle or joins a virtual waiting room called orbit if the server is busy. From the orbit, incoming calls retry to occupy the server in an exponentially distributed time and behave the same as a fresh incoming call. After an exponentially distributed idle time, the server makes an outgoing call whose duration is also exponentially distributed but with a different parameter from that of incoming calls. Our contribution is to derive the first order (law of large numbers) and the second order (central lim让 theorem) asymptotics for the distribution of the number of calls in the orb计 under the condition that the retrial rate is extremely low. The asymptotic results are used to obtain the Gaussian approximation for the distribution of the number of calls in the orbit. Our result generalizes earlier results where Poisson input was assumed.

关键词： Retrial queueing system incoming calls and outgoing calls MMPP-process asymptotic analysismethod gaussian approximation

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As Could We Assure Safety in Large-Scale Manufacturing of Nanoparticles for the Biomedical Use

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Journal of Biomaterials and Nanobiotechnology 2011年第5期2卷 601-613页

作者： Kirill Serguey Maksimov Serguei Kirillovich Maksimov Nikolay Dmitrievich Soukhov 不详

Nanoparticles provide great advantages but also great risks. Risks associating with nanoparticles are the problem of all technologies, but they increase in many times in nanotechnologies. Adequate methods of outgoing production inspection are necessary to solve the problem of risks, and the inspection must be based on the safety standard. Existing safety standard results from a principle of “maximum permissible concentrations or MPC”. This principle is not applicable to nanoparticles, but a safety standard reflecting risks inherent in nanoparticles doesn’t exist. Essence of the risks is illustrated by the example from pharmacology, since its safety assurance is conceptually based on MPC and it has already come against this problem. Possible formula of safety standard for nanoparticles is reflected in many publications, but conventional inspection methods cannot provide its realization, and this gap is an obstacle to assumption of similar formulas. Therefore the development of nanoparticle industry as a whole (also development of the pharmacology in particular) is impossible without the creation of an adequate inspection method. There are suggested new inspection methods founded on the new physical principle and satisfying to the adequate safety standard for nanoparticles. These methods demonstrate that creation of the adequate safety standard and the outgoing production inspection in a large-scale manufacturing of nanoparticles are the solvable problems. However there is a great distance between the physical principle and its hardware realization, and a transition from the principle to the hardware demands great intellectual and material costs. Therefore it is desirable to call attention of the public at large to the necessity of urgent expansions of investigations associated with outgoing inspections in nanoparticles technologies. It is necessary also to attract attention, first, of representatives of state structures controlling approvals of the adequate safety st

关键词： Risks of Nanoparticle Large-Scale Manufacturing Adequate Safety Standard outgoing Production Inspection Structure and Habit Scanning Electron Microscopy Habit Control by Means of Convergent Illuminating Electron Beams Safety Assurance in the Nanoparticle Industry Is a Solvable Problem

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