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Optimal Auxiliary Frequency Control of Wind Turbine Generators and Coordination with Synchronous Generators

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CSEE Journal of Power and Energy Systems 2021年第1期7卷 78-85页

作者： ming Sun yong min Lei Chen Kaiyuan Hou Deming Xia Hangyin Mao State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical EngineeringTsinghua UniversityBeijing 100084China with Northeast Branch of State Grid Corporation of China Shenyang 110180Liaoning ProvinceChina with State Grid Zhejiang Electric Power Co.LTD. Hangzhou 310007Zhejiang ProvinceChina

Auxiliary frequency control of a wind turbine generator(WTG) has been widely used to enhance the frequencysecurity of power systems with high penetration of renewableenergy. Previous studies recommend two types of control schemes,including frequency droop control and emulated inertia control,which simulate the response characteristics of the synchronousgenerator (SG). This paper plans to further explore the optimalauxiliary frequency control of the wind turbine based on previousresearch. First, it is determined that the virtual inertia control haslittle effect on the maximum rate of change of frequency (MaxROCOF)if the time delay of the control link of WTG is taken intoconsideration. Secondly, if a WTG operates in maximum powerpoint tracking (MPPT) mode and uses the rotor deceleration forfrequency modulation, its optimal auxiliary frequency control willcontain only droop control. Furthermore, if the droop control isproperly delayed, better system frequency response (SFR) willbe obtained. The reason is that coordination between the WTGand SG is important for SFR when the frequency modulationcapability of the WTG is limited. The frequency modulationcapability of the WTG is required to be released more ***, when designing optimal auxiliary frequency controlfor the WTG, a better control scheme is worth further study.

关键词： Frequency droop control power system frequency security rate of change of frequency(ROCOF) virtual inertia control wind turbine generator auxiliary frequency control

Theloderma licin McLeod and Ahmad,2007 (Lissamphibia:Anura:Rhacophoridae),a New Frog Record for Borneo

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Asian Herpetological Research 2013年第3期4卷 221-223页

作者： Indraneil DAS Jongkar GRINANG yong min PUI Institute of Biodiversity and Environmental Conservation Universiti Malaysia Sarawak

A new record of the rhacophorid frog, Theloderma licin is reported from Gunung Serambu, in the Bau region of western Sarawak, East Malaysia, which comprises the first published record of the species from the Sundaic island of Borneo. The species was previously known from the Malay Peninsula （southern Peninsular Thailand and Peninsular Malaysia）. Species of Theloderma are widespread in mainland and insular Southeast Asia, their arboreal habits perhaps contributing to our perception of rarity.

关键词： Theloderma licin Lissamphibia Anura Rhacophoridae Borneo new record

The recruitment of exogenous endothelial progenitor cells in lung tumor model of nude mice

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Chinese Journal of Cancer 2010年第11期29卷 952-958页

作者： Qiang Peng ming Liu Shu-min Song Xian-Hua Li Yi-Hua Du yong Zhi min-yong Wang Department of Surgery Affiliated Hospital of Luzhou Medical College Luzhou Sichuan 646000 P. R. China Physiology Laboratory Luzhou Medical College Luzhou Sichuan 646000 P. R. China Central Laboratory Luzhou Medical College Luzhou Sichuan 646000 P. R. China

Background and Objective: Endothelial progenitor cells (EPCs) play an important role in hypoxia-triggered tumor vasculogenesis. However, the homing of exogenous EPCs in tumors is still unclear. In this study, we investigated the recruitment of exogenous EPCs in human lung adenocarcinoma model of nude mice. Methods: EPCs labeled with green fluorescence protein (GFP) were transplanted into nude mice bearing human lung adenocarcinoma. The growth of tumor was observed. After the mice were killed, GFP-EPCs in different tissues were examined by fluorescence. The tumor tissues were stained for CD133, hypoxia-inducible factor-1alpha (HIF-1α), stromal cell-derived factor-1α (SDF-1α), and vascular endothelial growth factor receptor (KDR). Real-time polymerase chain reaction of CD133, HIF-1α, SDF-1α, and VEGF-1 were also performed. Results: The growth of tumor in EPC group was significantly faster than that in saline solution group (P < 0.05). Under fluorescence microscope, GFP-EPCs were strongly expressed in both tumor and bone marrow. EPCs were recruited to the tumor periphery to participate in tumor vasculogenesis. The expression of CD133, HIF-1α, and SDF-1 mRNA in tumor and bone marrow were significantly higher than that in the liver, spleen, and skin (P < 0.05). Conclusions: Exogenous EPCs can be recruited to tumor and accelerate tumor growth. Except tumor, bone marrow can also recruit EPCs.

关键词：内皮祖细胞肺肿瘤外源性血管内皮生长因子受体缺氧诱导因子-1α 裸鼠招聘模型

BioLeT: A new design strategy for functional bioluminogenic probes

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Chinese Chemical Letters 2015年第8期26卷 919-921页

作者： Tian-Chao Zhang Lu-Pei Du min-yong Li Department of Medicinal Chemistry Key Laboratory of Chemical Biology (MOE) School of Pharmacy Shandong University

By integrating photoinduced electron transfer（PET） into the design of functional bioluminogenic probes,Urano and his coworkers recently developed a new rational design strategy, BioLeT. It is expected that this BioLeT strategy will enable us to design and develop new bioluminescence probes for detecting various biomolecules with no catalytic or reactive activity.

关键词： probes detecting enable integrating rational utilized challenging instead absolute moiety

A New Approach to 2,3-Dihydro-1H-1,5-Benzodiazepines from the Reaction of o-Nitrophenylazide with α,β-Unsaturated Ketones Promoted by Samarium Diiodide

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Chinese Chemical Letters 2001年第1期12卷 5-6页

作者： Xiao Yuan CHEN Wei Hui ZHONG yong min ZHANG Department of Chemistry Zhejiang University at Xixi CampusHangzhou 310028 Laboratory of Organometallic Chemistry Chinese Academy of SciencesShanghai 200032 Department of Chemistry Hunan Jishou UniversityJishou416000

o-Nitrophenylazide was reduced by SmI2 in anhydrous THF at room temperature to produce active intermediate 2 (samarium amide), "living" double-anion in situ which reacted smoothly with α，β-unsaturated ketones to af... 详细信息

关键词： Samarium diiodide reduction nitro group azide 2 3-dihydro-1H-1 5-benzodiazepine.

Tetrahydrofuran Ring Opening with Acyl Chlorides or Anhydrides Catalyzed by Gallium Triiodides: A Novel and Facile Method for the Preparation of Iodo Esters

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Chinese Chemical Letters 2000年第3期11卷 191-194页

作者： Hua Yue WU Ren Er CHEN yong min ZHANG WenZhou Normal college Wenzhou 325000 Department of Chemistry Zhejiang University at Xixi CampusHangzhou 310028

Tetrahydrofuran ring can be opened with acyl chlorides or anhydrides catalyzed by gallium triiodides to afford iodo esters under mild conditions in good yields.

关键词： tetrahydrofuran ring acyl chloride anhydride gallium triiodides

Reduction of Elemental Selenium by Samarium Diiodide: the Synthesis of Dithiodiselenides and Dithioselenides

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Chinese Chemical Letters 2001年第5期12卷 379-382页

作者： Hong Yun GUO Yun Fa ZHENG yong min ZHANG Department of Chemistry Zhejiang University at Xixi CampusHangzhou 310028 Department of Chemistry Zhejiang Normal UniversityJinhua 321004 Department of Chemistry Lishui Teachers CollegeZhejiang 323000

The reduction of elemental selenium by samarium diiodide led to selective formation of selenolate anion species (Se-2(2-) and Se2-), these nucleophilic species reacted readily with sodium alkyl thiosulfates to afford ... 详细信息

关键词： Synthesis samarium diiodide dithiodiselenides dithioselenides.

A NOVEL ZWITTERIONIC SILANE COUPLING AGENT FOR NONTHROMBOGENIC BIOMATERIALS

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Chinese Journal of Polymer Science 2005年第6期23卷 611-617页

作者： yong-zhi Qiu Dou-yong min Chi Ben Chi Ben Qiang Chen Si-cong Lin Research Center of Surface ＆ Interface Chemistry and Engineering Technology Nanjing University Nanjing 210093 China College of Chemistry ＆ Environment Science Nanjing Normal University Nanjing 210097 China

A novel silane coupling agent bearing sulfobetaine group, N,N-diethyl-N-（3-sulfopropyl）-aminopropyl- trimethoxysilane （DESATS）, was first designed, synthesized and characterized. Its solution property was studied by means of dynamic light scattering. DESATS was successfully bonded onto the surface of the glass and proved by ESCA. Platelet adhesion assay in vitro indicated that the nonthrombogenicity of glass slide modified with DESATS is greatly improved.

关键词： Zwitterionic silane coupling agent Silicone-sulfobetaine Nonthrombogenic biomaterials

A chirality indicator for the walls and the surfaces of silica nanotubes

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Chinese Chemical Letters 2013年第8期24卷 770-772页

作者： Feng-Wen Hou Li-min Wu yong-min Guo Yi Li Bao-Zong Li Key Laboratory of Organic Synthesis of Jiangsu Province College of ChemistryChemical Engineering and Materials ScienceSoochow University

Single-handed helical silica nanotubes were prepared according to the literature procedures,using the self-assemblies of a pair of chiral cationic low-molecular-weight gelators as the templates.A chirality indicator,4,4＇-bis（triethoxysilyl）-1,1＇-biphenyl,was developed to determine the chirality of the silica *** chirality of the surfaces and the bulky walls of the silica nanotubes were understood from the twist of the biphenylene rings.

关键词： Sol-gel transcription Nanoparticles Silica nanotubes Self-assembly Chirality indicator