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Smart Local Energy Systems Towards Net Zero:Practice and Implications from the UK

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CSEE Journal of Power and Energy Systems 2023年第2期9卷 411-419页

作者： jianzhong wu Yue Zhou Wei Gan School of Engineering Cardiff UniversityCardiff CF243AAWalesUK.

In transition towards net-zero carbon emissions,a high penetration of renewable power generation and electrification of heat and transport at the grid edge will increase total and peak power consumption significantly with greater uncertainties,thus posing serious challenges to electric power *** local energy systems,which manage distributed energy resources locally with various smart technologies and commercial arrangements,are one of the promising solutions to this *** paper provides a comprehensive review and analysis of the practice of local energy systems in the UK in the context of net-zero *** the macro level,local conditions,local businesses,profitability,investment and whole electricity system impacts of local energy systems are ***,a practical case in North Wales,UK,is analyzed for demonstrating technical,commercial and regulatory arrangements available and needed for setting up a local energy system *** are summarized for providing a useful reference for developing smart local energy systems within and beyond the UK.

关键词： Distributed energy resource microgrid net zero smart local energy system smart grid

P2P energy trading via public power networks:Practical challenges,emerging solutions,and the way forward

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Frontiers in Energy 2023年第2期17卷 189-197页

作者： Yue ZHOU jianzhong wu Wei GAN School of Engineering Cardiff UniversityCardiff CF243AAWalesUK

Peer-to-peer(P2P)energy trading is an emerging energy supply paradigm where customers with distributed energy resources(DERs)are allowed to directly trade and share electricity with each other.P2P energy trading can facilitate local power and energy balance,thus being a potential way to manage the rapidly increasing number of DERs in net zero *** is of great importance to explore P2P energy trading via public power networks,to which most DERs are *** the extensive research on P2P energy trading,there has been little large-scale commercial deployment in practice across the *** this paper,the practical challenges of conducting P2P energy trading via public power networks are identified and presented,based on the analysis of a practical Local Virtual Private Networks(LVPNs)case in North Wales,*** ongoing efforts and emerging solutions to tackling the challenges are then summarized and critically ***,the way forward for facilitating P2P energy trading via public power networks is proposed.

关键词： distribution network local virtual private network network charges peer-to-peer(P2P)energy trading practical implementation

Electrical Properties of Medium Voltage Electricity Distribution Networks

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CSEE Journal of Power and Energy Systems 2021年第3期7卷 497-509页

作者： Sathsara Abeysinghe Muditha Abeysekera jianzhong wu Mahesh Sooriyabandara School of Engineering Cardiff UniversityCardiff CF243AAUnited Kingdom Toshiba-Bristol Research and Innovation Laboratory Bristol BS14ND.United Kingdom

An increasing amount of low carbon technologies(LCT)such as solar photovoltaic,wind turbines and electric vehicles are being connected at medium and low voltage levels to electric power *** support high-level decision-making processes,the impacts of the LCTs on large numbers of different types(e.g.,rural,suburban,urban)of distribution networks need to be fully understood and ***,detailed modeling of large numbers of real-world networks is challenging for two ***,access to real-world network data is limited,and second,cleaning the data requires a significant amount of time,even before modeling of the *** paper offers a novel systematic methodology aimed at identifying and quantifying the key electrical properties of medium-voltage level distribution *** methodology allows for characterizing different types(e.g.,suburban,urban)of distribution networks and obtaining'depth'dependent electrical properties of the models of the *** key sets of(electrical)data were used for the *** first set was installed capacities of distribution substations;and the second set was the conductor cross sections of the distribution *** the graph models of real-world networks,'nodes'represent the distribution sub-stations,switchgears,busbars and consumers locations of the network.'Links/edges'stand for the connections between the nodes through distribution *** results of the investigation of the real-world networks showed that,the substation capacities and the conductor cross sections could characterize the electrical properties of suburban and urban type distribution *** resulted probability density functions(PDF)of the electrical properties of suburban and urban type distribution networks have the potential to be directly used in generating realistic distribution network models.

关键词： Electricity distribution networks electrical properties medium voltage synthetic networks statistically-similar networks

Unsupervised change detection of man-made objects using coherent and incoherent features of multi-temporal SAR images

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Journal of Systems Engineering and Electronics 2022年第4期33卷 896-906页

作者： FENG Hao wu jianzhong ZHANG Lu LIAO Mingsheng State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhan 430079China Key Laboratory of Land Subsidence Monitoring and Prevention Ministry of Land and ResourcesShanghai 200072China Shanghai Engineering Research Center of Land Subsidence Shanghai 200072China Shanghai Institute of Geological Survey Shanghai 200072China

Constrained by complex imaging mechanism and extraordinary visual appearance,change detection with synthetic aperture radar(SAR)images has been a difficult research topic,especially in urban *** existing studies have extended from bi-temporal data pair to multi-temporal datasets to derive more plentiful information,there are still two problems to be solved in practical ***,change indicators constructed from incoherent feature only cannot characterize the change objects ***,the results of pixel-level methods are usually presented in the form of the noisy binary map,making the spatial change not intuitive and the temporal change of a single pixel *** this study,we propose an unsupervised man-made objects change detection framework using both coherent and incoherent features derived from multi-temporal SAR *** coefficients of variation in timeseries incoherent features and the man-made object index(MOI)defined with coherent features are first combined to identify the initial change ***,an improved spatiotemporal clustering algorithm is developed based on density-based spatial clustering of applications with noise(DBSCAN)and dynamic time warping(DTW),which can transform the initial results into noiseless object-level patches,and take the cluster center as a representative of the man-made object to determine the change pattern of each *** experiment with a stack of 10 TerraSAR-X images in Stripmap mode demonstrated that this method is effective in urban scenes and has the potential applicability to wide area change detection.

关键词： change detection multi-temporal synthetic aperture radar(SAR)data coherent and incoherent features clustering

In celebration of the 80th birthday of Professor Wenchuan Wang

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Green Energy & Environment 2020年第3期5卷 247-248页

作者： Dapeng Cao jianzhong wu Daojian Cheng Beijing University of Chemical Technology China jwu@engr.ucr.edu

It is our great pleasure to publish this special issue of "Molecular Thermodynamics for Green Engineering" in honor of Professor Wenchuan Wang on the occasion of his 80th birthday.

关键词： birthday honor pleasure

An improved theoretical procedure for the pore-size analysis of activated carbon by gas adsorption

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Chinese Journal of Chemical Engineering 2018年第3期26卷 551-559页

作者： Guodong Wang Jianchun Jiang Kang Sun jianzhong wu College of Chemical Engineering Nanjing Forestry University Department of Chemical and Environmental Engineering University of California Institute of Chemical Industry of Forest Products Chinese Academy of Forestry

Amorphous carbon materials play a vital role in adsorbed natural gas(ANG) storage. One of the key issues in the more prevalent use of ANG is the limited adsorption capacity, which is primarily determined by the porosity and surface characteristics of porous materials. To identify suitable adsorbents, we need a reliable computational tool for pore characterization and, subsequently, quantitative prediction of the adsorption behavior. Within the framework of adsorption integral equation(AIE), the pore-size distribution(PSD) is sensitive to the adopted theoretical models and numerical algorithms through isotherm fitting. In recent years, the classical density functional theory(DFT) has emerged as a common choice to describe adsorption isotherms for AIE kernel construction. However,rarely considered is the accuracy of the mean-field approximation(MFA) commonly used in commercial software. In this work, we calibrate four versions of DFT methods with grand canonical Monte Carlo(GCMC) molecular simulation for the adsorption of CH_4 and CO_2 gas in slit pores at 298 K with the pore width varying from 0.65 to 5.00 nm and pressure from 0.2 to 2.0 MPa. It is found that a weighted-density approximation proposed by Yu(WDA-Yu) is more accurate than MFA and other non-local DFT methods. In combination with the trapezoid discretization of AIE, the WDA-Yu method provides a faithful representation of experimental data, with the accuracy and stability improved by 90.0% and 91.2%, respectively, in comparison with the corresponding results from MFA for fitting CO_2 isotherms. In particular, those distributions in the feature pore width range(FPWR)are proved more representative for the pore-size analysis. The new theoretical procedure for pore characterization has also been tested with the methane adsorption capacity in seven activated carbon samples.

关键词： Non-local density functional theory Amorphous porous materials Pore size characterization Gas adsorption Adsorption integral equation

Microscopic principles of chemical engineering after fossil fuels

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Resources Chemicals and Materials 2022年第3期1卷 222-229页

作者： jianzhong wu Department of Chemical&Environmental Engineering University of CaliforniaRiversideCA 92521USA

Chemical engineering is a broad field in terms of the scope of practice but the discipline has been united by a few intellectually coherent principles. Among them, thermodynamics, reaction kinetics and transport phenomena are often considered as the cornerstones, providing support for the design and operation of diverse chemical processes for power generation and production of industrial goods such as plastics, gasoline and ammonia. Traditionally, these industrial processes use fossil fuels as the raw materials and are responsible for significant greenhouse gas emissions. As fossil-energy-based processes are deemed phasing out , development of alternative routes with renewable energy and sustainable feedstock is calling for the expansion of the knowledge base such that eco-friendly chemical processes can be quantified, controlled and optimized with high precision. This article offers some perspectives on possible engineering developments to accelerate the paradigm shift from fossil fuels to renewable energy.

关键词： Chemical engineering principles Sustainability Renewable energies Chemical processes

Computational screening and design of nanoporous membranes for efficient carbon isotope separation

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Green Energy & Environment 2020年第3期5卷 364-373页

作者： Jingqi Wang Musen Zhou Diannan Lu Weiyang Fei jianzhong wu Department of Chemical Engineering Tsinghua UniversityBeijing100084China Department of Chemical and Environmental Engineering University of CaliforniaRiversideCA92521United States

Stable isotopes have been routinely used in chemical sciences,medical treatment and agricultural *** technologies to produce high-purity isotopes entail lengthy separation processes that often suffer from low selectivity and poor energy *** advances in nanoporous materials open up new opportunities for more efficient isotope enrichment and separation as the pore size and local chemical environment of such materials can be engineered with atomic *** this work,we demonstrate the unique capability of nanoporous membranes for the separation of stable carbon isotopes by computational screening a materials database consisting of 12,478 computation-ready,experimental metal-organic frameworks(MOFs).Nanoporous materials with the highest selectivity and membrane performance scores have been identified for separation of^(12)CH_4/^(13)CH_4 at the ambient condition(300 K).Analyzing the structural features and metal sites of the promising MOF candidates offers useful insights into membrane design to further improve the *** upper limit of the efficiency has been identified for the separation of^(12)CH_4/^(13)CH_4 with the existing MOFs and those variations by replacement of the metal sites.

关键词： Metal-organic frameworks Isotope separation Computational materials design Thermodynamics

Molecular dynamics for the charging behavior of nanostructured electric double layer capacitors containing room temperature ionic liquids

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Nano Research 2015年第3期8卷 931-940页

作者： Xian Kong Diannan Lu Zheng Liu jianzhong wu Department of Chemical and Environmental Engineering University of California Riverside CA 9252 I USA Department of Chemical Engineering Tsinghua University Beijing 100084 China

The charging kinetics of electric double layers （EDLs） is closely related to the performance of a wide variety of nanostructured devices including supercapacitors, electro-actuators, and electrolyte-gated transistors. While room temperature ionic liquids （RTIL） are often used as the charge carrier in these new applications, the theoretical analyses are mostly based on conventional electrokinetic theories suitable for macroscopic electrochemical phenomena in aqueous solutions. In this work, we study the charging behavior of RTIL-EDLs using a coarse-grained molecular model and constant-potential molecular dynamics （MD） simulations. In stark contrast to the predictions of conventional theories, the MD results show oscillatory variations of ionic distributions and electrochemical properties in response to the separation between electrodes. The rate of EDL charging exhibits non-monotonic behavior revealing strong electrostatic correlations in RTIL under confinement.

关键词： electric double layer room temperature ionicliquids nanostructured capacitor charging dynamics