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Journal of Modern Power Systems and Clean Energy 2023年第6期11卷 1971-1981页

作者： Tong Cheng Zhenfei tan Haiwang Zhong IEEE State Key Laboratory of Power Systems the Department of Electrical EngineeringTsinghua UniversityBeijingChina

Multi-energy integrations provide great opportunities for economic and efficient resource utilization. In the meantime, power system operation requires enough flexible resources to deal with contingencies such as transmission line tripping. Besides economic benefits, this paper focuses on the security benefits that can be provided by multi-energy integrations. This paper first proposes an operation scheme to coordinate multiple energy production and local system consumption considering transmission networks. The integrated flexibility model, constructed by the feasible region of integrated demand response(IDR), is then formulated to aggregate and describe local flexibility. Combined with system security constraints, a multi-energy system operation model is formulated to schedule multiple energy production, transmission, and consumption. The effects of local system flexibility on alleviating power flow violations during N-1 line tripping contingencies are then analyzed through a multi-energy system case. The results show that local system flexibility can not only reduce the system operation costs, but also reduce the probability of power flow congestion or violations by approximately 68.8% during N-1 line tripping contingencies.

关键词： Multi-energy system integrated flexibility feasible region integrated demand response N-1 security

Amorphous hybrid tungsten oxide–nickel hydroxide nanosheets used as a highly efficient electrocatalyst for hydrogen evolution reaction

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Nano Research 2024年第4期17卷 2499-2508页

作者： Chao Lyu Chenghai Dai Yiwei tan State Key Laboratory of Materials-Oriented Chemical Engineering School of Chemistry and Chemical EngineeringNanjing Tech UniversityNanjing 211816China

There are more challenges for alkaline hydrogen evolution reaction(HER)via simultaneously expediting the electron-coupled water dissociation process(Volmer step)and the following electrochemical H_(2) desorption(Heyrovsky step).Hybrid amorphous electrocatalysts are highly desirable for efficient hydrogen evolution from water-alkali electrolyzers due to the bifunctionality for the different elementary steps of HER and optimal interactions with water molecules and the reactive hydrogen intermediates(Had).Herein,the synthesis of amorphous hybrid ultrathin(tungsten oxide/nickel hydroxide)hydrate(a-[WO_(3)/Ni(OH)_(2)]·0.2H_(2)O)nanosheets on nickel foam(NF)for efficient alkaline HER is *** structural and composition features of a-[WO_(3)/Ni(OH)_(2)]·0.2H_(2)O are characterized in *** resulting a-[WO_(3)/Ni(OH)_(2)]·0.2H_(2)O/NF electrocatalyst with the synergistic effect of both hybrid components for the HER elementary steps shows greatly improved the activity and durability for the HER with a low overpotential of-41 and-163 mV at-10 and-500 mA·cm^(-2),respectively,a Tafel slope as low as-72.9 mV·dec^(-1),and long-term stability of continuous electrolysis for at least 150 h accompanying by inappreciable overpotential change in 1 M *** the hybrid a-[WO_(3)/Ni(OH)_(2)]·0.2H_(2)O,Ni(OH)_(2) and WO_(3) moieties are separately responsible for accelerating dissociative adsorption of water and weakening Had adsorption strength,which is beneficial to the improvement of the alkaline HER activity.

关键词： amorphous nanomaterial bimetallic electrocatalyst tungsten oxide ultrathin nanosheet hydrogen evolution reaction

Towards functional verifying a family of SystemC TLMs

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Frontiers of Computer Science 2020年第1期14卷 53-66页

作者： Tun LI Jun YE Qingping tan College of Computer National University of Defense TechnologyChangsha 410073China Laboratory of Software Engineering for Complex Systems Changsha 410073China Jiangnan Institute of Computing Technology Wuxi 214083China

It is often the case that in the development of a system-on-a-chip(SoC)design,a family of SystemC transaction level models(TLM)is *** in the same family often share common functionalities but differ in their timing,implementation,configuration and performance in various SoC developing *** most cases,all the TLMs in a family must be verified for the follow-up design *** our previous work,we proposed to call such family TLM product line(TPL),and proposed feature-oriented(FO)design methodology for efficient TPL ***,developers can only verify TLM in a family one by one,which causes large portion of duplicated verification ***,in our proposed methodology,functional verification of TPL has become a *** this paper,we proposed a novel TPL verification method for FO *** our method,for the given property,we can exponentially reduce the number of TLMs to be verified by identifying mutefeature-modules(MFM),which will avoid duplicated *** proposed method is presented in informal and formal way,and the correctness of it is *** theoretical analysis and experimental results on a real design show the correctness and efficiency of the proposed method.

关键词： system-on-a-chip transaction level model SystemC feature-oriented functional verification

Ionic liquid-based electrolytes for CO2 electroreduction and CO2 electroorganic transformation

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National Science Review 2022年第4期9卷 168-185页

作者： Xingxing tan Xiaofu Sun Buxing Han Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Colloid and Interface and ThermodynamicsCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of Sciences School of Chemistry and Chemical Engineering University of Chinese Academy of Sciences Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular EngineeringEast China Normal University

CO;2;is an abundant and renewable C1 *** transformation of CO;2;can integrate CO;2;fixation with renewable electricity storage,providing an avenue to close the anthropogenic carbon *** a new type of green and chemically tailor able solvent,ionic liquids（ILs） have been proposed as highly promising alternatives for conventional electrolytes in electrochemical CO;2;*** review summarizes major advances in the electrochemical transformation of CO;2;into value-added carbonic fuels and chemicals in IL-based media in the past several *** the direct CO;2;electroreduction（CO;2;ER）and CO;2;-involved electro organic transformation（CO;2;EOT） are discussed,focusing on the effect of electrocatalysts,IL components,reactor configurations and operating conditions on catalytic activity,selectivity and *** reasons for the enhanced CO;2;conversion performance by ILs are also discusse d,providing guidance for the rational design of novel IL-based electro chemical processes for CO;2;***,the critical challenges remaining in this research area and promising directions for future research are proposed.

关键词： ionic liquid carbon dioxide electrocatalysis green synthesis value-added fuels and chemicals

Fault Detection Method for Permanent Magnet Synchronous Generator Wind Energy Converters Using Correlation Features Among Three-phase Currents

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Journal of Modern Power Systems and Clean Energy 2020年第1期8卷 168-178页

作者： Yanghong tan Haixia Zhang Ye Zhou College of Electrical and Information Engineering Hunan UniversityChangshaChina NARI Group Corporation(State Grid Electric Power Research Institute) NanjingChina

In a permanent magnet synchronous generator(PMSG)system,conversion systems are major points of failure that create expensive and time-consuming *** detection is usually used to achieve a steady *** paper presents a full analysis of a PMSG system for wind turbines(WT)and proposes a fault detection method using correlation *** proposed method is motivated by the balance among the three-phase currents both before and after an opencircuit fault occurs in a converter of the PMSG *** is unnecessary to analyze the output waveforms of a converter during fault *** this study,two correlation features of stator currents,the mean and covariation,are extracted to train an artificial neural network(ANN),thereby enhancing the performance of the proposed method under different wind speed ***,additional sensors and the collection of a massive amount of data are not *** simulations of an ideal inverter and a PMSG system are conducted using PSCAD *** simulation results show that the proposed method can detect the locations of faulty switches with a diagnostic rate greater than 99.4%for the ideal inverter,and the PMSG drives settings at different wind speeds.

关键词： Permanent magnet synchronous generator(PMSG) artificial neural network(ANN) mixed logical dynamical(MLD)theory conversion system

Dynamic friction energy dissipation and enhanced contrast in high frequency bimodal atomic force microscopy

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Friction 2022年第5期10卷 748-761页

作者： Xinfeng tan Dan GUO Jianbin LUO State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

Dynamic friction occurs not only between two contact objects sliding against each other,but also between two relative sliding surfaces several nanometres *** emerging micro-and nano-mechanical systems that promise new applications in sensors or information technology may suffer or benefit from noncontact *** we demonstrate the distance-dependent friction energy dissipation between the tip and the heterogeneous polymers by the bimodal atomic force microscopy(AFM)method driving the second order flexural and the first order torsional vibration *** pull-in problem caused by the attractive force is avoided,and the friction dissipation can be imaged near the *** friction dissipation coefficient concept is proposed and three different contact states are determined from phase and energy dissipation *** contrast is enhanced in the intermediate setpoint *** work offers an effective method for directly detecting the friction dissipation and high resolution images,which overcomes the disadvantages of existing methods such as contact mode AFM or other contact friction and wear measuring instruments.

关键词： dynamic friction energy dissipation contact states image contrast bimodal atomic force microscopy(AFM)

Crack propagation with different radius local random damage based on peridynamic theory

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Frontiers of Structural and Civil Engineering 2021年第5期15卷 1238-1248页

作者： Jinhai ZHAO Li tan Xiaojing DOU Department of Civil Engineering Zhejiang University City CollegeHangzhou 3100015China College of Civil Engineering and Architecture Zhejiang UniversityHangzhou 310058China College of Civil Engineering Tongji UniversityShanghai 200092China Shanghai Baoye Group Corp. Ltd.Shanghai 200941China

Drawing from the advantages of Classical Mechanics,the peridynamic theory can clarify the crack propagation mechanism by an integral solution without initially setting the factitious crack and crack *** study implements the peridynamic theory by subjecting bilateral notch cracked specimens to the conditions of no local damage,small radius local damage,and large radius local ***,to study the effects of local stochastic damage with different radii on the crack propagation path and Y-direction displacement,a comparison and contact methodology was adopted,in which the crack propagation paths under uniaxial tension and displacement in the Y-direction were compared and *** method can be applied to steel structures under similar local random damage conditions.

关键词： peridynamics stochastic damage bilateral notch crack

Photo-induced surface frustrated Lewis pairs for promoted photocatalytic decomposition of perfluorooctanoic acid

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Frontiers of Environmental Science & Engineering 2023年第1期17卷 27-32页

作者： Xianjun tan Zhenying Jiang Yuxiong Huang Tsinghua-Berkeley Shenzhen Institute(TBSI) Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China

Heterogeneous photocatalysis has gained substantial research interest in treating per-and polyfluoroalkyl substances(PFAS)-contaminated ***,sluggish degradation kinetics and low defluorination efficiency compromise their practical ***,we report a superior photocatalyst,defected Bi_(3)O(OH)(PO_(4))_(2),which could effectively degrade typical PFAS,perfluorooctanoic acid(PFOA),with high defluorination *** UV light irradiation could in situ generate oxygen vacancies on Bi_(3)O(OH)(PO_(4))_(2) through oxidation of the lattice hydroxyls,which further promotes the formation of Lewis acidic coordinately unsaturated bismuth ***,the Lewis acidic sites couple with the proximal surface hydroxyls to constitute the surface frustrated Lewis pairs(SFLPs).With the in-depth spectroscopic analysis,we revealed that the photo-induced SFLPs act as collection centers to effectively adsorb PFOA and endow accessible pathways to transfer photogenerated holes to PFOA ***,activation of the terminal carboxyl,a ratelimiting step for PFOA decomposition,could be easily achieved over the defected Bi_(3)O(OH)(PO_(4))_(2) *** results suggest that SFLPs exhibit great potential in developing highly efficient photocatalysts to degrade persistent organic pollutants.

关键词： Heterogeneous photocatalysis Surface frustrated Lewis pairs Perfluorooctanoic acid Defluorination efficiency Environmental remediation

Dual Interval Optimization Based Trading Strategy for ESCO in Day-ahead Market with Bilateral Contracts

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Journal of Modern Power Systems and Clean Energy 2020年第3期8卷 582-590页

作者： Shengmin tan Xu Wang Chuanwen Jiang Key Laboratory of Control of Power Transmission and Conversion Ministry of EducationShanghai Jiao Tong UniversityShanghai 200240China

Being capable of aggregating multiple energy resources, the energy service company(ESCO) has been regarded as a promising alternative for improving power system flexibility and facilitating the consumption of renewable resources in the electricity market. Considering the uncertain variables in day-ahead(DA) market trading, an ESCO can hardly determine their accurate probability distribution functions. Traditional interval optimization methods are used to process these uncertain variables without specific probability distribution ***, the lower and upper bounds of the intervals may change due to extreme weather conditions and other emergent events. Hence, a dual interval optimization based trading strategy(DIOTS) for ESCO in a DA market with bilateral contracts(BCs) is proposed. First, we transfer the dual interval optimization model into a simple model consisting of several interval optimization models. Then, a pessimistic preference ordering method is applied to solve the derived model. Case studies illustrating an actual test system corroborate the validity and the robustness of the proposed model, and also reveal that ECSO is critical in improving power system flexibility and facilitating the ability of absorbing renewable resources.

关键词： Dual interval optimization energy service company(ESCO) day-ahead market bilateral contract market

Strengthening network slicing for Industrial Internet with deep reinforcement learning

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Digital Communications and Networks 2024年第4期10卷 863-872页

作者： Yawen tan Jiadai Wang Jiajia Liu National Engineering Laboratory for Integrated Aero-Space-Ground-Ocean Big Data Application Technology School of CybersecurityNorthwestern Polytechnical UniversityXi’an710072China

Industrial Internet combines the industrial system with Internet connectivity to build a new manufacturing and service system covering the entire industry chain and value *** highly heterogeneous network structure and diversified application requirements call for the applying of network slicing *** robust network slicing is essential for Industrial Internet,but it faces the challenge of complex slice topologies caused by the intricate interaction relationships among Network Functions(NFs)composing the *** works have not concerned the strengthening problem of industrial network slicing regarding its complex network *** this end,we aim to study this issue by intelligently selecting a subset of most valuable NFs with the minimum cost to satisfy the strengthening ***-of-the-art AlphaGo series of algorithms and the advanced graph neural network technology are combined to build the *** results demonstrate the superior performance of our scheme compared to the benchmark schemes.

关键词： Industrial Internet Network slicing Deep reinforcement learning Graph neural network