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Low-Carbon Dispatching for Virtual Power Plant with Aggregated Distributed Energy Storage Considering Spatiotemporal Distribution of Cleanness Value

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Journal of Modern Power Systems and Clean Energy 2024年第2期12卷 346-358页

作者： Hongchao Gao Tai Jin Guanxiong Wang Qixin Chen chongqing Kang Jingkai Zhu State Key Laboratory of Power System Operation and Control Department of Electrical EngineeringTsinghua UniversityBeijing 100084China Sichuan Energy Internet research Institute Tsinghua University Chengdu 200016China Power Dispatching and Control center of Shanghai Municipal Electric Power Company Shanghai 200122China IEEE

The scale of distributed energy resources is increasing,but imperfect business models and value transmission mechanisms lead to low utilization ratio and poor *** address this issue,the concept of cleanness value of distributed energy storage(DES)is proposed,and the spatiotemporal distribution mechanism is discussed from the perspectives of electrical energy and *** on this,an evaluation system for the environmental benefits of DES is constructed to balance the interests between the aggregator and the power system ***,an optimal low-carbon dispatching for a virtual power plant(VPP)with aggregated DES is constructed,where-in energy value and cleanness value are both *** achieve the goal,a green attribute labeling method is used to establish a correlation constraint between the nodal carbon potential of the distribution network(DN)and DES behavior,but as a cost,it brings multiple nonlinear ***,a solution method based on the convex envelope(CE)linear re-construction method is proposed for the multivariate nonlinear programming problem,thereby improving solution efficiency and ***,the simulation verification based on the IEEE 33-bus DN is *** simulation results show that the multidimensional value recognition of DES motivates the willingness of resource users to ***,resolving the impact of DES on the nodal carbon potential can effectively alleviate overcompensation of the cleanness value.

关键词： Distributed energy storage virtual power plant(VPP) spatiotemporal distribution low-carbon dispatching

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Single-atom Ni-N_(4) for enhanced electrochemical sensing

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Nano research 2024年第8期17卷 7658-7664页

作者： Zhuhui Qin Bo Tang Guiru Zhang chongqing Zhu Kun Jiang Bowei Zhang Fu-Zhen Xuan Shanghai Key Laboratory of Intelligent Sensing and Detection Technology East China University of Science and TechnologyShanghai 200237China Key Laboratory of Pressure Systems and Safety of Ministry of Education East China University of Science and TechnologyShanghai 200237China School of Mechanical and Power engineering East China University of Science and TechnologyShanghai 200237China Key Laboratory of Theoretical and Computational Photochemistry Ministry of EducationCollege of ChemistryBeijing Normal UniversityBeijing 100875China Interdisciplinary research center School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Single-atom catalysts(SACs)attract widespread attention in heterogeneous catalysis due to their maximum atomic utilization efficiency and unique physical and chemical ***,their applications in chemical sensing keep huge potential but remain ***,a Ni-N_(4)-C SAC was synthesized for the trace detection of dopamine(DA)and uric acid(UA).The Ni-N_(4)-C SAC exhibited superior sensing performance compared to the Ni *** detection range for DA and UA were 0.05–75μM and 5–90μM with detection limits of 0.02. and 0.82.M,*** functional theory(DFT)computations indicate that Ni-N_(4)-C has a lower reaction barrier during electrochemical process,indicating that the atomic Ni sites possess higher intrinsic activity than Ni ***,DA and UA show strong potential dependency on the Ni-N_(4)-C catalyst,indicating its applicability for their concurrent *** work extends the application of SACs in chemical sensing.

关键词： single-atom catalysts chemical sensing dopamine uric acid

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Influence of stacking fault energy on formation of long period stacking ordered structures in Mg-Zn-Y-Zr alloys

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Progress in Natural Science:Materials International 2011年第6期21卷 485-490页

作者： Fu-sheng PAN~(1,2.,Su-qin LUO~1,Ai-tao TANG~(1,2.,Jian PENG~(1,2.,Yun LU~3 1.College of Materials Science and engineering,chongqing University,{2.,china 2.national engineering research center for magnesium alloys,chongqing University,{2.,china 3.Faculty of engineering,Chiba University,Chiba 2.3-852.,Japan [a] College of Materials Science and engineering Chongqing University Chongqing 400044 China [b] national engineering {2. center for magnesium alloys Chongqing University Chongqing 400044 China [c] Faculty of engineering Chiba University Chiba 263-8522 Japan

The influence of alloying elements on the stacking fault energy（SFE） of Mg-Y-Zn-Zr alloys was calculated by using first-principles,and the microstructure of as-cast Mg-1.05Y-0.79Zn-0.07Zr（mole fraction,%） alloy prepared by conventional casting was investigated by SEM,TEM and *** block-like long period stacking ordered（LPSO） phase,the lamellar LPSO phase and stacking faults were observed simultaneously and the lamellar LPSO structure and stacking faults were both formed on （0001）α-Mghabit plane and grown or extended along[01 1 0]α-*** calculation results by the first-principles showed that the addition of Y can sharply decrease the stacking fault energy of the Mg-Zn-Y-Zr alloy,while Zn slightly increases the stacking fault energy of the *** influence of stacking fault energy on the formation of LPSO was *** shows that LPSO may nucleate directly through stacking faults and the lower stacking fault energy was in favor of formation of LPSO.

关键词： magnesium alloy Mg-Zn-Y-Zr long period stacking ordered(LPSO) structures stacking fault energy(SFE) firstprinciples calculation

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Effect of surface nanocrystallization on the corrosion behavior of Zircaloy-4

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Science china(Technological Sciences) 2009年第8期52卷 2227-2231页

作者： ZHU YuTao1,2.& ZHANG XiYan1,2.3 1 College of Materials Science and engineering, chongqing University, chongqing 400045, china 2.national engineering research center for magnesium alloys, chongqing University, chongqing 400044, china 3 School of Physical Science and engineering Technology, Guangxi University, Nanning 530004, china 1. College of Materials Science and engineering Chongqing University Chongqing 400045 China 2. national engineering {2. center for magnesium alloys Chongqing University Chongqing 400044 China 3. School of Physical Science and engineering Technology Guangxi University Nanning 530004 China

The contrastive corrosion experiments between surface nanocrystallined Zircaloy-4 and coarse-grained Zircaloy-4 under the condition of 673 K/10.3 MPa in pure water are carried out, and the microstructure of oxide films has been studied. The results indicate that the growth rate of oxide films formed on the nanocrystalline Zircaloy-4 is lower than that of oxide films formed on the coarse-grained Zircaloy-4. Simultaneously, the oxide/metal interface of the former is more regular and glossy than that of the latter. For nanocrystalline Zircaloy-4, the low oxygen diffusion rate through the oxide/metal interface can hinder the reaction of oxygen ion with metal ion. Furthermore, more tetragonal ZrO2.are observed in the oxide films, which can delay the martensite phase transition from tetragonal to monoclinic phase in oxide films.

关键词： nanocrystalline Zircaloy oxide film microstructure

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Thermal-stress Simulation of Direct-chill Casting of AZ31 magnesium Alloy Billets

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Journal of Wuhan University of Technology(Materials Science) 2009年第3期24卷 376-382页

作者：胡红军 College of Materials Science and engineering Chongqing University national engineering {2. center for magnesium alloys Chongqing University College of Material Science and engineering Chongqing University of Technology

Two-dimensional （2.） transient coupled finite element model was developed to compute the temperature and stress field in cast billets, so as to predict the defects of the I-type billets made from AZ31 magnesium alloy and find the causes and solutions for surface cracks and shrinkages during direct-chill （DC） casting process. Method of equivalent specific heat was used in the heat conduction equation. The boundary and initial conditions used for primary and secondary cooling were elucidated on the basis of the heat transfer during the solidification of the billet. The temperature and the thermal-stress fields were simulated with the thermal-structural coupled module of ANSYS software. The influences of casting parameters on the distributions of temperature and stress were studied, which helped optimize the parameters （at pouring temperature of 680 ℃, casting speed of 2.min/s, heat-transfer coefficient of the second cooling equals to 5 000 W/m^2.℃^-1）. The simulation results of thermal stress and strain fields reveal the formation mechanism of some casting defects, which is favourable for optimizing the casting parameters and obtain high quality billets. Some measures of controlling processes were taken to prevent the defects for direct-chill casting billets.

关键词： magnesium alloy direct-chill casting temperature and stress fields numerical simulation solidification model

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Phase Evolution during Carbothermic Reduction Process of Ilmenite for TiC_xN_(1-x) Composite Powders

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稀有金属材料与工程 2011年第S3期40卷 281-285页

作者： Tang Aitao1,2. Chen Min1, Wang Jian1,2. Liu Chuanpu1, Pan Fusheng1,2. Wang Weiqing1 1 College of Materials Science and engineering, chongqing University,chongqing 400045, china 2.national engineering research center for magnesium alloys, chongqing University, chongqing 400044, china chongqing Univ Coll Mat Sci & Engn Chongqing 400045 Peoples R China chongqing Univ Natl Engn Res Ctr Magnesium Alloys Chongqing 400044 Peoples R China

As cutting materials and wear-resistant materials, the composites reinforced by Ti(C,N) have very high performances. The super-high cost of these composites, however, limits apparently their wider application to industry due to use of very expensive Ti(C,N) powders. Therefore, it is very necessary to develop a new process technology with low fabrication cost. In the present work, ilmenite (FeTiO3), which is very cheap and very rich in china, was used to fabricate the Ti(C,N) powder directly. The phase evolution during carbothermic reduction process of ilmenite was investigated by XRD, TG-DSC and thermodynamic calculation. The ilmenite and graphite were mixed by high energy ball milling and then sintered in pure flowing nitrogen atmosphere. The experimental results showed that a new phase, Ti4O7, appeared at 900 ℃ and disappeared at 1100 ℃ while sintered in pure flowing nitrogen atmosphere. The phase evolution during carbothermic reduction process of ilmenite was found to be continuous as FeTiO3→Ti4O7→T3O5→TiCN. XRD results showed that the composite powders produced in the present reaction were composed of α-Fe and TiC1-xNx. The thermodynamic calculation results were agreeable with experimental results.

关键词： ilmenite TiCxN1-x composite powders thermodynamic calculation carbothermic reduction

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Effects of scandium addition on microstructure and mechanical properties of ZK60 alloy

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Progress in Natural Science:Materials International 2011年第1期21卷 59-65页

作者： Fu-sheng PAN~(1,2.,Ting-ting LIU~(1,2.,Xi-yan ZHANG~(1,2.,Ai-tao TANG~(1,2.,Wei-qing WANG~(1,2. 1.national engineering {2. center for magnesium alloys,chongqing University,chongqing 400045,china 2.College of Materials Science and engineering,chongqing University,chongqing 400045,china [a] national engineering {2. center for magnesium alloys Chongqing University Chongqing 400045 China [b] College of Materials Science and engineering Chongqing University Chongqing 400045 China

The effects of Sc addition on the microstructure and mechanical properties of the ZK60 wrought magnesium alloy were investigated by using optical microscope,scanning electron microscopy,X-ray diffraction and tensile *** experimental results show that a minor Sc addition to ZK60 alloy has an obvious effect on the refinement of the microstructure of the ZK60 alloy. During hot extrusion,incomplete dynamic recrystallization occurs in all the alloys,and the recrystallized grains become much finer with increasing Sc *** tensile strengths of ZK60 evidently increase with the addition of Sc,but the elongations decrease. The ZK60 alloy with 0.6%(mass fraction) Sc addition is found to have the tensile strength of about 350 MPa and the yield strength of about 2.0 *** T6 heat treatment,the tensile strength of the alloy containing 0.6%Sc remains almost ***, the yield strength of the alloy increases up to 352.MPa,and the ratio of the tensile strength to the yield strength is close to 1.

关键词： wrought magnesium alloy scandium microstructure mechanical properties

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Grain refinement of Mg-Li-Al cast alloys by adding typical master alloys

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Progress in Natural Science:Materials International 2011年第3期21卷 236-239页

作者： Bin JIANG~(1,2.,Qing-shan YANG~2.Ming-xing ZHANG~3,Dong QIU~3,Rui-hong LI~2.Fu-sheng PAN~(1,2. 1.national engineering {2. center for magnesium alloys,chongqing University,chongqing 400044,china 2.College of Materials Science and engineering,chongqing University,chongqing 400044,china 3.Division of Materials,School of Mechanical and Mining engineering, The University of Queensland,St Lucia,QLD 4072.Australia [a] national engineering {2. center for magnesium alloys Chongqing University Chongqing 400044 China [b] College of Materials Science and engineering Chongqing University Chongqing 400044 China [c] Division of Materials School of Mechanical and Mining Engineering The University of Queensland St Lucia QLD 4072 Australia

Commercial Al-3Ti-1C and Al-5Ti-1B master alloys were added in order to refine the grains of Mg-Li-Al *** effects of their addition levels on grain refinement of Mg-Li-Al cast alloy were investigated and the mechanism of the grain refinement was *** results showed that the addition of Al-3Ti-1C master alloy reduced the grain size of LA141 cast alloy from 900μm to 400μm,while the addition of Al-5Ti-1B master alloy reduced the grain size of LA51 cast alloy from 500μm to 2.0μ*** grain refining mechanism was the heterogeneity nucleation of TiC and TiB2.because of less than 10%mismatches of TiC/β-Li and TiB2.α-Mg.

关键词： magnesium lithium alloy master alloy grain refinement

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Effect of Sr on microstructure and aging behavior of Mg-14Li alloys

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Progress in Natural Science:Materials International 2012年第2期22卷 160-168页

作者： Bin Jiang a,b,c,Ying Zeng b,Hengmei Yin a,b,Ruihong Li a,b,Fusheng Pan a,b a national engineering {2. center for magnesium alloys,chongqing University,chongqing 400030,china b College of Materials Science and engineering,chongqing University,chongqing 400030,china c New Materials center,chongqing Academy of Science and Technology,chongqing 40112.,china [a] national engineering {2. center for magnesium alloys Chongqing University Chongqing 400030 China [b] College of Materials Science and engineering Chongqing University Chongqing 400030 China [c] New Materials center Chongqing Academy of Science and Technology Chongqing 401123 China

The as-cast and as-extruded Mg-14 wt%Li-xSr(x=0.14,0.19,0.39 wt%)alloys were,respectively,prepared through a simple alloying process and hot *** effects of Sr addition on microstructure and aging behavior of the Mg-14 wt%Li-xSr alloys were *** results indicated that b(Li)and Mg2.r were the two primary phases in the microstructures of both as-cast and as-extruded Mg-14 wt%Li-xSr ***,with the increase of Sr content from 0.14 wt%to 0.39 wt%,the grain sizes of the as-cast and as-extruded Mg-14 wt%Li-xSr alloys markedly decreased from 5000 mm and 38 mm to 330 mm and 2. mm respectively,while no obvious changes of the micro-hardness and microstructure of the as-extruded alloys were observed during the aging treatment.

关键词： magnesium-lithium alloys Microstructure Grain refinement Aging behavior

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Flow instability of buoyant-Marangoni convection in the LEC GaAs melt

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Science china(Technological Sciences) 2008年第4期51卷 397-406页

作者： CHEN ShuXian1 & LI MingWei2.3 1 Aviation engineering Institute, Civil Aviation Flight University of china, Guanghan 618307, china 2.Institute of Power engineering of chongqing University, chongqing 400030, china 3 research center of Biological Function Information and Instruments of chongqing University by Sec-ond-Term national 985 Project, chongqing University, chongqing 400030, china Aviation engineering Institute Civil Aviation Flight University of China Guanghan 618307 China Institute of Power engineering of chongqing University Chongqing 400030 China research center of Biological Function Information Instruments of chongqing University by Second-Term national 985 Project Chongqing University Chongqing 400030 China

Flow transitions and instabilities have significant effects on the quality of the crystals. The flow and heat transfer in the LEC GaAs melt are numerically studied by a time-dependent and three-dimensional turbulent flow model. The effects of the change of the buoyancy and Marangoni force on the flow state are analyzed by changing the temperature difference between the crystal and the crucible walls. The results show that the flow will transform from axisymmetric steady flow to non-axisymmetric oscillatory flow when the temperature difference exceeds the critical value, and that the mechanism of the transition is attributed to the Marangoni instability. The critical temperature differences for the flow transitions corresponding to different melt depth H are numerically predicted. Several important characteristics of the non-axisymmetric buoyant-Marangoni convection are numerically observed and compared with that of the non-axisymmetric mixed convection coupled with crystal rotation.

关键词： flow transition flow instability buoyant-Marangoni convection mixed convection LEC GaAs melt

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