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Small signal stability region of power systems with DFIG in injection space

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Journal of Modern Power Systems and Clean Energy 2013年第2期1卷 127-133页

作者： chao qin Yixin YU Key Laboratory of Smart Grid Tianjin UniversityTianjin 300072China

The modal analysis method is utilized to study the influence of doubly-fed induction generator(DFIG)on electromechanical *** this basis,the small signal stability region(SSSR)of power systems with DFIG in injection space is evaluated and the corresponding relationship between SSSR boundary and electromechanical oscillations is *** effects of the locations of DFIG on SSSR are *** is found that the boundary of SSSR consists of several smooth surfaces,which can be approximated with hyper-planes in engineering *** the integration of DFIG,SSSR becomes smaller,thus indicating the deterioration of the small signal stability of the *** 11-bus system with four generators is used to illustrate the proposed method.

关键词： Doubly-fed induction generator(DFIG) Modal analysis Electromechanical oscillation Small signal stability region(SSSR)

Distributed spatio-temporal generative adversarial networks

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Journal of Systems Engineering and Electronics 2020年第3期31卷 578-592页

作者： qin chao GAO Xiaoguang School of Electronics and Information Engineering Northwestern Polytechnical UniversityXi’an 710100China

Owing to the wide range of applications in various fields,generative models have become increasingly ***,they do not handle spatio-temporal features *** by the recent advances in these models,this paper designs a distributed spatio-temporal generative adversarial network(STGAN-D)that,given some initial data and random noise,generates a consecutive sequence of spatio-temporal samples which have a logical *** paper builds a spatio-temporal discriminator to distinguish whether the samples generated by the generator meet the requirements for time and space coherence,and builds a controller for distributed training of the network gradient updated to separate the model training and parameter updating,to improve the network training *** model is trained on the skeletal dataset and the traffic *** contrast to traditional generative adversarial networks(GANs),the proposed STGAN-D can generate logically coherent samples with the corresponding spatial and temporal features while avoiding mode *** addition,this paper shows that the proposed model can generate different styles of spatio-temporal samples given different random noise inputs,and the controller can improve the network training *** model will extend the potential range of applications of GANs to areas such as traffic information simulation and multiagent adversarial simulation.

关键词： distributed spatio-temporal generative adversarial network(STGAN-D) spatial discriminator temporal discriminator speed controller

Application of carbon materials for Zn anode protection in aqueous Zn metal batteries

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Rare Metals 2024年第10期43卷 4807-4843页

作者： Cui-qin chao Yan-Nan Li Yan Zhao College of Energy Materials and Chemistry Inner Mongolia UniversityHohhot 010021China School of Physical Science and Technology Inner Mongolia UniversityHohhot 010021China

Aqueous Zn metal batteries(AZMBs)have gained widespread attention due to their high theoretica specific capacity,good safety,and low *** Zn anodes suffer from serious problems of dendrites and side reactions,which should be solved by modifying the Zn anode(Zn host,protective layer),electrolyte,and *** materials with structurally tunable and physicochemical stability properties have been widely used in the study of Zn anode protection and have also been reviewed in the past ***,review reports on carbon-based Zn anodes for Zn anode protection from new perspectives are still urgently ***,the timeliness of the review reports is very valuable for researchers to timely and accurately understand the dynamics of the research ***,this review firs reports the significance of AZMBs and summarizes the current main challenges that should be solved for practical ***,the ways to construct long-life Zn anodes using carbon materials from the perspectives of modified carbon materials with gradient properties(gradient zincophilicity,gradient electrical conductivity,and multigradient deposition)as protective layers/hosts to guide Zn ions toward bottom-up gradient Zn deposition are *** addition,the recent advances of carbon materials for electrolyte and separator modifications are ***,the remaining challenges and future perspectives of carbon materials in AZMBs Zn anode protection are briefly outlined.

关键词： Carbon Aqueous Zn battery Anode protection Gradient deposition

Optimal Coordinated Bidding Strategy of Wind and Solar System with Energy Storage in Day-ahead Market

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Journal of Modern Power Systems and Clean Energy 2022年第1期10卷 192-203页

作者： Yinping Yang chao qin Yuan Zeng Chengshan Wang School of Electrical and Information Engineering Tianjin UniversityTianjin 300072China

Although wind and solar power is the major reliable renewable energy sources used in power grids,the fluctuation and unpredictability of these renewable energy sources require the use of ancillary services,thereby increasing the integration *** study proposes a wind,solar,and pumped-storage cooperative(WSPC)model that can be applied to large-scale systems connected to dispersed renewable energy *** model provides an optimized coordinated bidding strategy in the day-ahead market,along with a method to facilitate revenue distribution among participating *** model takes advantage of the natural complementary characteristics of wind and solar power while using pumped storage to adjust the total output *** the coordinated bidding strategy,a proportion of the energies is provided as firm power,which can lower the ancillary service ***,a multi-period firm power-providing mode is adopted to reflect the wind-solar output characteristics of each period *** duration of each period is selected as a variable to accommodate seasonal *** ensures that the provision of firm power can maintain a high proportion under varied connected ratios of wind-solar,thereby obtaining higher *** using the revenue distribution method,the short-term influencing factors of the cooperative model are considered to provide the economic characteristics of wind farms and photovoltaic *** this way,revenue distribution can be fairly realized among the participating ***,the effectiveness and economy of the proposed model are validated based on actual data obtained from the power grid in California,USA.

关键词： Wind energy solar energy energy storage energy resources power system economics

The impacts of evaluation indices and normalization methods on E-TOPSIS optimization of return vent height for an impinging jet ventilation system

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Building Simulation 2022年第12期15卷 2081-2095页

作者： chao qin Shi-Hai Wu Hong-Qiang Fang Wei-Zhen Lu Department of Architecture and Civil Engineering City University of Hong KongHong KongChina School of Architecture and Art Central South UniversityChangshaChina

Stratified air distribution(STRAD)systems have been intensively investigated in recent decades for their energy-saving potential and good indoor air quality ***,the evaluation indices used to optimize STRAD systems and the normalization methods for weight calculation vary from one research to *** study aims to investigate the impacts of evaluation indices on the optimal return vent height of a room cooled by an impinging jet ventilation system(one type of STRAD system).The effects of several widely used normalization methods(i.e.,vector normalization,sum normalization,min-max normalization,and no normalization)on indices weights are *** evaluation indices are cooling coil load(Q_(coil)),energy-saving potential(ΔQ_(coil)),mean age of air(MAA),CO_(2) mass fraction,temperature difference between the head and ankles(ΔT_(0.1-1.1)),predicted mean vote(PMV),predicted percentage of dissatisfied(PPD),and draft rate(DR).The multi-criteria optimization method is the entropy-based technique for order preference by similarity to ideal solution(E-TOPSIS).As a result,the min-max normalization method evens the weight of each index and results in unreasonable relative ***,the raw matrix(i.e.,the normalization is omitted)is suggested for weight *** these indices,ΔT_(0.1-1.1) and PPD play critical ***ΔT_(0.1-1.1),the optimal return vent height changes from mid-level to near-floor,while without PPD,it changes to *** important result is that the Q_(coil) plays the most trivial role,followed by MAA and ***,the optimal return vent height is not determined by energy-saving performance but by performances of thermal comfort.

关键词： evaluation indices normalization method impinging jet ventilation return vent height E-TOPSIS

Energy Loss and J/ψ Suppression in Relativistic pA and AA Collisions

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Chinese Physics Letters 1998年第12期15卷 874-876页

作者： TAI An chao Wei-qin YAO Xia-xia Institute of High Energy Physics Chinese Academy of SciencesBeijing 100039 CCAST(World Laboratory) P.O.Box 8730Beijing 100080 Departrnent of Physics Hebei Normal UniversityShijiazhuang 050016

When the cross section of J/ψproduction is considered as varying with the energy of the nucleon-nucleon interaction,the production of J/ψin pA and A A collisions has been studied by using FRITIOF *** calculation shows that the cross section of J/ψproduction“per nucleon-nucleon collision”decreases with the increasing mass number and centrality as a consequence of continuous energy loss of the projectile nucleons to the target nucleons in their successive binary nucleon-nucleon *** model predictions have been compared with the experimental data of J/ψproduction.

关键词： consequence successive Collisions

Thermoelectric transport properties of Pb-Sn-Te-Se system

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Rare Metals 2018年第4期37卷 343-350页

作者： Bing-chao qin Yu Xiao Yi-Ming Zhou Li-Dong Zhao School of Materials Science and Engineering Beihang University Beijing 100191 China

IV-VI compounds are considered as promising thermoelectric materials, and high thermoelectric performance was achieved in IV-VI solid solutions. In this work, the thermoelectric properties of Pb-Sn-Te-Se-based solid solutions were systematically investigated. Among these solid solutions, it is found that a figure of merit （ZT） peak value of 1.0 at 873 K can be obtained in （PbTe）0.5（SnTe）o.5, on account of the combination of superior electrical properties in SnTe and low thermal conductivity in PbTe. Furthermore, we investigated and summarized the thermoelectric transport properties and proposed the thermoelectric performance maps for the IV- VI solid solutions in Pb-Sn-Te-Se system. This comprehensive investigation on Pb-Sn-Te-Se-based solid solutions can effectively guide and scan thermoelectric performance for a given unknown composition and enhance the thermoelectric properties in IV-VI compounds.

关键词： Thermoelectric materials Electricalconductivity Thermal conductivity Pb-Sn-Te-Se system Solid solutions

Investigation on halogen-doped n-type SnTe thermoelectrics

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Rare Metals 2022年第11期41卷 3803-3814页

作者： Chang-Rong Guo Bing-chao qin Dong-Yang Wang Li-Dong Zhao School of Materials Science and Engineering Beihang UniversityBeijing100191China

Recent theoretical predictions and experimental findings on the transport properties of n-type SnTe have triggered extensive researches on this simple binary compound,despite the realization of n-type SnTe being a great ***,Cl as a donor dopant can effectively regulate the position of Fermi level in Sn_(0.6)Pb_(0.4)Te matrix and successfully achieve the n-type transport behavior in *** outstanding power factor of~14.7μW·cm^(-1)·K^(-2) at 300 K was obtained for Cl-doped Sn_(0.6)Pb_(0.4)Te *** combining the experimental analysis with theoretical calculations,the transport properties of n-type SnTe thermoelectrics doped with different halogen dopants(Cl,Br,and I)were then systematically investigated and *** results demonstrated that Br and I had better doping efficiencies compared with Cl,which contributed to the well-optimized carrier concentrations of~1.03×10^(19)and~1.11×10^(19)cm^(-3)at 300 K,*** improved n-type carrier concentrations effectively lead to the significant enhancement on the thermoelectric performance of n-type *** study further promoted the experimental progress and deep interpretation of the transport features in n-type SnTe *** present results could also be crucial for the development of n-type counterparts for SnTe-based thermoelectric devices.

关键词： Thermoelectric performance n-type SnTe Halogen doping Doping efficiency

Activating AIN thin film by introducing Co nanoparticles as a new anode material for thin-film lithium batteries

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Rare Metals 2018年第8期37卷 625-632页

作者： Zhong Yan Xiao-Ye Niu Xiao-qin Du qin-chao Wang Xiao-Jing Wu Yong-Ning Zhou Department of Materials Science National Microanalysis CenterFudan University

A1N/Co nanocomposite thin films were fabricated by pulsed laser deposition and investigated as new anode materials for lithium-ion batteries for the first time. The combination of electrochemically inactive A1N and Co in nanometer scale boosted the electrochemical performance of the thin films surprisingly. A high reversible capacity of 555 mAh.g^-1 after 100 discharge-charge cycles at a current density of 500 mA.g^-1 is obtained for the A1N/Co nanocomposite thin films, and 372 mAh.g^-1 can be retained at a high rate up to 16C, exhibiting promising cycle stability and rate capability. The electrochemical reaction mechanism study reveals that Co nanoparticles could not only provide high electronic conductivity for the thin films, which facilitate the thorough decomposition of A1N in the initial discharge process, but also react with Li3N to form a new species CozN during charge process, thus ensuring large capacity and high reversibility of A1N/Co nanocomposite thin films in sub- sequent cycles. This study provides a new perspective to design advanced electrode materials for lithium-ion batteries.

关键词： Lithium-ion battery Anode material Thinfilm Aluminum nitride Pulsed laser deposition