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A review on charging behavior of electric vehicles:data,model,and control

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Control Theory and Technology 2020年第3期18卷 217-230页

作者： qing-shan JIA Teng LONG Center for Intelligent and Networked Systems(CFINS) Department o f AutomationBeijing National Research Center for Information Science and Technology(BNRist)Tsinghua UniversityBeijing 100084China

The adoption and usage of electric vehicles(EVs)have emerged recently due to the increasing concerns on the greenhouse gas issues and energy *** a part of the smart grid,EVs can provide valuable ancillary services beyond consumers of ***,EVs are gradually considered as nonnegligible loads due to their increasing penetration,which may result in negative effects such as voltage deviations,lines saturation,and power *** and interaction among EVs,charging stations,and micro grid have to be considered in the next generation of smart ***,the topic of smart charging has been the focus of many works where a wide range of control methods have been *** one of the bases of simulation,the EV charging behavior and characteristics have also become the focus of many *** this work,we review the charging behavior of EVs from the aspects of data,model,and *** provide the links for most of the data sets reviewed in this work,based on which interested researchers can easily access these data for further investigation.

关键词： Electric vehicle charging behavior data and model

On large action space in EV charging scheduling optimization

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Science China(Information Sciences) 2022年第2期65卷 45-60页

作者： Zhaoyu JIANG qing-shan JIA Xiaohong GUAN Center for Intelligent and Networked Systems Beijing National Research Center for Information Science and Technology Department of Automation Tsinghua University MOE KLINNS Lab Xi'an Jiaotong University

In order to reduce the air pollution by traditional fossil fuel and save the charging cost, much attention has been paid to the charging scheduling of electric vehicles(EVs) in the uncertain supplement of wind power and solar power. Owing to the randomness in the renewable power generation and the EV charging demand, simulation-based policy improvement(SBPI) has been well adopted for making charging decision. However, it is challenging to explore the large action space which grows exponentially with respect to the system scale. We consider this important problem in this paper and make the following ***, we explore the structural property of the problem and develop an urgency index to rank the ***, we apply three methods to search in the action space. Third, we numerically demonstrate the performance of the urgency index and the search methods, and compare the SBPI methods with the CPLEXbased method. It shows that SBPI improves the base policies in all these cases.

关键词： EV simulation-based policy improvement large action space sampling

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Event-based optimization with random packet dropping

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Science China(Information Sciences) 2020年第11期63卷 175-194页

作者： qing-shan JIA Jing-Xian TANG Zhenning LANG Center for Intelligent and Networked Systems Department of AutomationTsinghua University NetEase Inc.

Event-based optimization(EBO) provides a general framework for policy optimization in many discrete event dynamic systems where decision making is triggered by events that represent state transitions with common features. Because the number of events can be defined by the user and usually increases linearly with respect to the system scale, EBO has good potential to address large-scale problems where the state space grows exponentially. However, in many practical systems, sensors are geographically distributed and connected to a central controller through imperfect communication channels. Therefore, events observed by the sensors may not reach the controller. Optimization methods of event-based policies in these cases have not yet been identified. In this paper, we consider this important problem and make three major contributions. First, we formulate a mathematical EBO model in which the communication between sensors and controllers is subject to random packet dropping. Second, we show that this EBO model can be converted to another EBO model with perfect communication. Then, the performance difference equation and the performance derivative equation for event-based policies are straightforward to develop. One gradient-based policy iteration algorithm is developed for problems where the state transition probabilities are explicitly known, while another for problems where they are unknown. Third, the performance of the algorithms and the impact of the packet dropping probability on policy performance are numerically demonstrated on a single-zone occupant level estimation problem in buildings.

关键词： event-based optimization packet dropping discrete event dynamic systems

On distributed event-based optimization for shared economy in cyber-physical energy systems

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Science China(Information Sciences) 2018年第11期61卷 11-13页

作者： qing-shan JIA Junjie WU Center for Intelligent and Networked Systems (CFINS) Department of AutomationBeijing National Research Center for Information Science and Technology (BNRist)Tsinghua University

Dear editor,In order to accommodate the sharp increase in energy consumption and environmental pollution, it is important to coordinate the supply and the demand. This has become a key feature in a cyberphysical energy system (CPES), where the energy consumer and supplier share information with each other to improve the overall energy efficiency and therefore to reduce the environmental *** economy has risen sharply across the globe and becomes an effective model to improve the efficiency in an investment. Examples include but are

关键词： Figure EBO On distributed event-based optimization for shared economy in cyber-physical energy systems

Effects of the continuous cooling process conditions on the crystallization and liberation characteristics of anosovite in Ti-bearing titanomagnetite smelting slag

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International Journal of Minerals,Metallurgy and Materials 2019年第9期26卷 1120-1128页

作者： Zhen Wang Hao-yan Sun qing-shan Zhu State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

This study involved the investigation of the effects of the continuous cooling process conditions on the crystallization and liberation characteristics of anosovite in Ti-bearing titanomagnetite smelting slag. The samples were heated until melting and then the temperature was held at 1650℃ for nearly 0.5 h;subsequently, the samples were cooled at different cooling rates to different temperatures and water-quenched after being held for different times at these temperatures. Last, the obtained crystallized samples were used to analyze the crystallization and liberation characteristics. It was found that, during the continuous cooling process, anosovite particles were found to initially precipitate in the slag at a relatively high crystallization temperature, showing the characteristics of euhedral crystal. The precipitation and growth of anosovite grain is strong and the morphology of anosovite was basically not affected by the continuous cooling conditions. From the morphology perspective, the formed anosovite is an excellent Ti-rich phase to be selective separated. The formation of spinel and diopside is negative for the liberation and selective separation of the anosovite phase. The crystallization diagrams of TiO2-MgO-CaO-SiO2-Al2O3-FeO slag undergoing different continuous cooling processes were constructed to help to determine the optimal continuous cooling–quenching condition for selective separation of anosovite. Moreover, the addition of B2O3 can enlarge the range of the optimal continuous cooling–quenching conditions for selective separation of anosovite.

关键词： titanium-bearing slag crystallization anosovite liberation titanomagnetite

Microporous metal-organic framework materials for efficient capture and separation of greenhouse gases

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Science China Chemistry 2023年第8期66卷 2181-2203页

作者： shan-qing Yang Tong-Liang Hu Banglin Chen School of Materials Science and Engineering National Institute for Advanced MaterialsNankai UniversityTianjin300350China Department of Chemistry University of Texas at San AntonioSan AntonioTexas78249-0698USA

The release of anthropogenic greenhouse gases into the atmosphere poses serious risks to the environment and human health,and is a global threat of growing *** order to ameliorate the greenhouse gas emission problems,the efficient capture and separation of these greenhouse gases are greatly ***-organic framework(MOF)materials,a relatively new kind of organic-inorganic hybrid porous materials with unique framework features,tunable pore environment and high surface areas,have been widely studied as regards their applicability to this *** the well-defined structures of MOF materials greatly promote the understanding of structure-property *** this review,we intend to provide a profound account of significant progress in the field of capture and separation of greenhouse gases using MOFs as adsorbents,including carbon dioxide,methane,nitrous oxide and fluorocompounds(such as perfluorocarbons,sulfur hexafluoride,hydrochlorocarbons,and hydrofluocarbons).The strategies used to realize the efficient capture and separation of greenhouse gases have been summarized,and the relationships between the frameworks,their capture and separation performances and mechanisms are ***,the existing challenges and perspectives with regard to the development of MOF materials for the capture and separation of greenhouse gases and industrial practical application are outlined to further promote this very significant and active emerging topic.

关键词： porous materials metal-organic frameworks greenhouse gases capture and separation structure-property relationship

Coherence Loss of Two-Photon Jaynes-Cummings Model in Dispersive Approximation

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Communications in Theoretical Physics 2004年第1期41卷 111-114页

作者： ZHOULing GUOYan-qing SONGHe-shan LIChong DepartmentofPhysics DalianUniversityofTechnologyDalian116023China

Completely solving the dissipative dynamics of nonlinear Jaynes-Cumming model is a very difficult *** our recent work (Phys. Lett. A284 (2001) 156), we just obtained analytical results of the field dissipative dynamicsof the nonlinear JCM. In the present paper, employing the perturbative expansion of master equation, we obtain thedensity operator of the system (field +atom). The coherence losses of the system and of the atom are investigated whentwo-photon process is involved. We also study the effect of different atomic initial states and the influence of the fieldamplitude on the atomic coherence loss.

关键词： dissipative dynamics two-photon Jaynes-Cummings model master equation coherence loss linear entropy

A new beam element for analyzing geometrical and physical nonlinearity

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Acta Mechanica Sinica 2010年第4期26卷 605-615页

作者： Xiao-Feng Wang qing-shan Yang Qi-Lin Zhang College of Civil Engineering Tongji University 709 Civil Building 1239 Siping Road Shanghai 200092 China School of Civil Engineering Beijing Jiaotong UniversityBeijing 100044 China

Based on Timoshenko＇s beam theory and Vlasov＇s thin-walled member theory, a new model of spatial thin-walled beam element is developed for analyzing geometrical and physical nonlinearity, which incorporates an interior node and independent interpolations of bending angles and warp and takes diversified factors into consideration, such as traverse shear deformation, torsional shear deformation and their coupling, coupling of flexure and torsion, and the second shear stress. The geometrical nonlinear strain is formulated in updated Lagarange （UL） and the corresponding stiffness matrix is derived. The perfectly plastic model is used to account for physical nonlinearity, and the yield rule of von Mises and incremental relationship of Prandtle-Reuss are adopted. Elastoplastic stiffness matrix is obtained by numerical integration based on the finite segment method, and a finite element program is compiled. Numerical examples manifest that the proposed model is accurate and feasible in the analysis of thin-walled structures.

关键词： Spatial beams Thin-walled section Beam element Geometrical and physical nonlinearity FEM

Tuning d-spacing of graphene oxide nanofiltration membrane for effective dye/salt separation

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Rare Metals 2023年第2期42卷 418-429页

作者： Chao Xing Chang-Yu Liu Chao Lai shan-qing Zhang Center for Clean Environment and Energy School of Environment and ScienceGold Coast CampusGriffith UniversitySouthportQLD4222Australia School of Chemistry and Materials Science Jiangsu Normal UniversityXuzhou221116China School of Biotechnology and Health Sciences Wuyi UniversityJiangmen529020China

The interlayer spacing(i.e.,d-spacing)plays a crucial role in determining the selectivity and permeability of nanofiltration membranes.A high-throughput directional filtration can be achieved by designing and controlling the *** this study,the d-spacing of a graphene oxide(GO)membrane was tuned and fixed to the desired value(approximately 0.79 nm)using a solution of polyethyleneimine(PEI)and GO at a PEI/GO mass ratio of15:*** resultant PEI/GO was deposited on a polyacrylonitrile(PAN)substrate to form a robust composite nanofiltration membrane(a PEI/GO@PAN membrane).The as-prepared membrane exhibited an ultrahigh flux of117.8 L·m^(-2)·h^(-1),and the rejection values for Direct Red80(DR80)and Na_(2)SO_(4)reached 99.7%and<1.7%,respectively;these are desirable values for dye/salt *** PEI/GO@PAN membrane exhibited an excellent filtration performance,and had a longer lifespan and excellent reusability because of its reinforced *** work suggested that tuning the d-spacing with PEI would be an effective strategy to achieve the anticipated functions of nanofiltration membranes.

关键词： Separation Nanofiltration Graphene oxide Membrane d-spacing