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Insulating materials for realising carbon neutrality:Opportunities,remaining issues and challenges

High Voltage 2022年第4期7卷 610-632页

作者： Chuanyang Li Yang Yang Guoqiang Xu Yao Zhou Mengshuo Jia Shaolong Zhong Yu Gao Chanyeop Park Qiang Liu Yalin Wang Shakeel Akram Xiaoliang Zeng Yi Li Fangwei Liang Bin Cui Junpeng Fang Lingling Tang Yulin Zeng Xingtao Hu Jiachen Gao Giovanni Mazzanti Jinliang He Jianxiao Wang Davide Fabiani Gilbert Teyssedre Yang Cao Feipeng Wang Yunlong Zi The State Key Laboratory of Power System Department of Electrical EngineeringTsinghua UniversityBeijingChina Department of Mechanical and Automation Engineering The Chinese University of Hong KongHong KongChina Simpson Querrey Institute Northwestern UniversityEvanstonIllinoisUSA Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPennsylvaniaUSA Department of Information Technology and Electrical Engineering ETH ZürichZürichSwitzerland School of Electrical and Information Engineering Tianjin UniversityTianjinChina Department of Electrical and Computer Engineering Mississippi State UniversityMississippi StateMississippiUSA Electrical and Electronic Engineering The University of ManchesterManchesterUK Department of Electrical Engineering School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghaiChina Key Laboratory of Control of Power Transmission and Conversion(SJTU) Ministry of EducationShanghaiChina College of Electrical Engineering Sichuan UniversityChengduChina Shenzhen Institute of Advanced Technology Chinese Academy of Sciences ShenzhenShenzhenChina School of Electrical Engineering Wuhan UniversityWuhanChina School of Integrated Circuits Tsinghua UniversityBeijingChina Jiangsu Jinxin Electric Appliance Co.Ltd. YangzhouChina Tai'an Tiancheng Safety Evaluation Co. Ltd.Tai'anChina Department Electrical Electronic and Information EngineeringUniversity of BolognaBolognaItaly National Engineering Laboratory for Big Data Analysis and Applications Peking UniversityBeijingChina Laplace Paul Sabatier Universityand CNRSToulouseFrance Electrical and Computer Engineering University of ConnecticutStorrsConnecticutUSA State Key Laboratory of Power Transmission Equipment&System Security and New Technology School of Electrical EngineeringChongqing UniversityChongqingChina Thrust of Sustainable Energy and Environment The Hong Kong University of Science and Technology(Guangzhou)GuangzhouChina De

The 2050 carbon-neutral vision spawns a novel energy structure revolution,and the construction of the future energy structure is based on equipment *** material,as the core of electrical power equipment and electrified transportation asset,faces unprecedented challenges and *** goal of carbon neutral and the urgent need for innovation in electric power equipment and electrification assets are first *** engineering challenges constrained by the insulation system in future electric power equipment/devices and electrified transportation assets are *** materials,including intelligent insulating material,high thermal conductivity insulating material,high energy storage density insulating material,extreme environment resistant insulating material,and environmental-friendly insulating material,are cat-egorised with their scientific issues,opportunities and challenges under the goal of carbon neutrality being *** the context of carbon neutrality,not only improves the understanding of the insulation problems from a macro level,that is,electrical power equipment and electrified transportation asset,but also offers opportunities,remaining issues and challenges from the insulating material *** is hoped that this paper en-visions the challenges regarding design and reliability of insulations in electrical equipment and electric vehicles in the context of policies towards carbon neutrality *** authors also hope that this paper can be helpful in future development and research of novel insulating materials,which promote the realisation of the carbon-neutral vision.

关键词： neutral insulation extreme

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The Study on Flow Distribution of Supercritical Co2 in Multiple Channels of Printed Circuit Heat Exchanger

SSRN

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SSRN 2023年

作者： Jin, Feng Chen, Deqi Hu, Lian Huang, Yanping Bu, Shanshan Key Laboratory of Low-grade Energy Utilization Technologies and Systems Chongqing University 400044 China College of Mechanical and Power Engineering Chongqing University of Science and Technology Chongqing400044 China CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology Nuclear Power Institute of China Chengdu610041 China

The printed circuit heat exchanger (PCHE) is a promising candidate in the application of the supercritical CO2 Brayton cycle. The flow maldistribution of PCHE is a practical issue due to the multi-channels in the core region, which may affect the performance of PCHE in the operation. Therefore, in this paper, the flow distribution and thermohydraulic characteristics of PCHE with three different channel configurations including the straight channel, wavy channel, and airfoil channel are investigated. The flow non-uniformity with two types of headers (free manifold and straight rib manifold) is compared among the three configurations under different mass flow rates. Based on the results, it is found that the core region of PCHE with larger flow resistance shows better flow uniformity and heat transfer performance. And the header structure is of great significance to the flow distribution based on the analysis of flow vector contours. Therefore, a modified manifold, with bent fins and airfoil fins, is proposed to improve the flow maldistribution of PCHE. Compared to the free manifold and straight rib manifold, the flow non-uniformity of the modified manifold is reduced by 39.4% and 61.8%, respectively;and the overall performance is averagely increased by 5% and 8.5%, respectively. Hence, it is recommended that the designers adopt the modified manifold for the performance improvement of integrated PCHE. © 2023, The Authors. All rights reserved.

关键词： Brayton cycle

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Neural Network-Based Adaptive Fixed-Time Terminal Sliding Mode Control for Unknown Nonlinear Systems

Neural Network-Based Adaptive Fixed-Time Terminal Sliding Mo...

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Complex Systems and Intelligent Science (CSIS-IAC), International Annual Conference on

作者： Siwen Liu Yi Zuo Tieshan Li Huanqing Wang Xiaoyang Gao Yang Xiao The Navigation College Dalian Maritime University Dalian Liaoning China The School of Automation Engineering University of Electronic Science and Technology of China Chengdu Sichuan China The School of Mathematical Sciences Bohai University Jinzhou Liaoning China Department of Computer Science The University of Alabama Tuscaloosa USA

ISBN: (数字)9798331504755

ISBN: (纸本)9798331504762

The adaptive fixed-time terminal sliding mode control (TSMC) problem will be discussed for unknown nonlinear strict-feedback systems. Neural networks are used to estimate the unknown nonlinearities existing in the systems. When the control scheme is designed, the dynamic surface control (DSC) method is applied to avert the derivation of the virtual control signal and a novel hyperbolic tangent filter is developed. Subsequently, the adaptive control method is introduced to proposed a terminal sliding surface (TSS). Consequently, an adaptive TSMC controller is developed. Using the Lyapunov stability theory, we prove that the tracking error inclines to the TSS and a small interval near zero, and the closed-loop signals are bounded within fixed time. Finally, the availability of the proposed scheme is demonstrated by the simulation example.

关键词： Backstepping Simulation Neural networks Filtering theory Nonlinear systems Complex systems Adaptive control Sliding mode control Lyapunov methods Convergence

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Experimental Study on Cooling Heat Transfer Performance of Supercritical Co2 in Zigzag Printed Circuit Heat Exchanger

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SSRN 2023年

作者： Jin, Feng Yuan, Dewen Chen, Deqi Hu, Lian Huang, Yanping Bu, Shanshan Key Laboratory of Low-grade Energy Utilization Technologies and Systems Chongqing University 400044 China CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology Nuclear Power Institute of China Chengdu610041 China College of Mechanical and Power Engineering Chongqing University of Science and Technology Chongqing400044 China

The zigzag printed circuit heat exchanger (PCHE) is promising as the precooler in the application of supercritical CO2 Brayton cycle. In this study, the experimental investigation is conducted to explore the heat transfer performance of supercritical CO2 in the mini-channels of zigzag PCHE. The experimental range of pressure, temperature and mass flux are 7.5-9.0 MPa, 50-90°C and 300-600 kg/(m2∙s), respectively. The structural parameters of diameter, pitch and bend angle are D = 2.0 mm, Lp = 7.24 mm and θ = 40°, respectively. The effects of system pressure, inlet temperature, and mass flux on the heat transfer performance of supercritical CO2 are investigated by measuring multiple temperature points along the zigzag channel. The results show that the heat transfer coefficient exhibits a higher level near the pseudo-critical region due to the dramatic thermophysical properties variation of supercritical CO2. Meanwhile, both the change of mass flux and pressure have a significant influence on the S-CO2 heat transfer coefficient, while the effect of inlet temperature is relatively small. Furthermore, the comparison is conducted between the existing heat transfer correlations and the experimental results. Four new cooling heat transfer correlations are proposed and compared by considering the effect of velocity change and cross-sectional thermophysical property variation on heat transfer performance. It is found that adding variates to the correlation can improve the prediction accuracy of the results while iterative calculation becomes more difficult. In order to improve the robustness and prediction accuracy, it is determined to choose the correlation without the density form, which predict 91.5% of the experimental data within ±25% error band. © 2023, The Authors. All rights reserved.

关键词： Timing circuits

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First experimental constraints on WIMP couplings in the effective field theory framework from CDEX

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Science China(Physics,Mechanics & Astronomy) 2021年第8期64卷 15-22页

作者： Yi Wang Zhi Zeng Qian Yue LiTao Yang KeJun Kang YuanJing Li Mehment Agartioglu HaiPeng An JianPing Chang JingHan Chen YunHua Chen JianPing Cheng Cheng Yi Chiang WenHan Dai Zhi Deng ChangHao Fang XinPing Geng Hui Gong QiuJu Guo XuYuan Guo HongJian He Li He ShengMing He JinWei Hu TuChen Huang HanXiong Huang HaiTao Jia LiPing Jia Xi Jiang HauBin Li JianMin Li Jin Li MingXuan Li RenMingJie Li Xia Li YuLan Li Bin Liao FongKay Lin ShinTed Lin ShuKui Liu YanDong Liu Yu Liu YuanYuan Liu ZhongZhi Liu Hao Ma YuCai Mao QiYuan Nie JinHua Ning Hui Pan NingChun Qi Jie Ren XiChao Ruan ChangSong Shang Vivek Sharma Ze She Lakhwinder Singh Monoj Kumar Singh TianXi Sun ChangJian Tang WeiYou Tang Yang Tian GuangFu Wang Li Wang Qing Wang Yu Chen Wang YunXiang Wang Zhen Wang Henry Tsz-King Wong ShiYong Wu YuCheng Wu HaoYang Xing Yin Xu Tao Xue YuLu Yan Nan Yi ChunXu Yu HaiJun Yu JianFeng Yue Ming Zeng BingTao Zhang Lei Zhang FengShou Zhang ZhenYu Zhang KangKang Zhao MingGang Zhao JiFang Zhou ZuYing Zhou JingJun Zhu Key Laboratory of Particle and Radiation Imaging(Ministry of Education) Department of Engineering PhysicsTsinghua UniversityBeijing 100084China Department of Physics Tsinghua UniversityBeijing 100084China Institute of Physics Academia SinicaTaipei 11529China NUCTECH Company Beijing 100084China YaLong River Hydropower Development Company Chengdu 610051China College of Nuclear Science and Technology Beijing Normal UniversityBeijing 100875China College of Physics Sichuan UniversityChengdu 610065China School of Physics Peking UniversityBeijing 100871China Sino-French Institute of Nuclear and Technology Sun Yet-sen UniversityZhuhai 519082China Department of Nuclear Physics China Institute of Atomic EnergyBeijing 102413China Department of Physics Banaras Hindu UniversityVaranasi 221005India Department of Physics Beijing Normal UniversityBeijing 100875China School of Physics Nankai UniversityTianjin 300071China

We present weakly interacting massive particles(WIMPs) search results performed using two approaches of effective field theory from the China Dark Matter Experiment(CDEX), based on the data from both CDEX-1B and CDEX-10 stages. In the nonrelativistic effective field theory approach, both time-integrated and annual modulation analyses were used to set new limits for the coupling of WIMP-nucleon effective operators at 90% confidence level(C.L.) and improve over the current bounds in the low mχregion. In the chiral effective field theory approach, data from CDEX-10 were used to set an upper limit on WIMP-pion coupling at 90% C.L. We for the first time extended the limit to the m_(χ)<6 GeV/c^(2) region.

关键词： WIMP EFT CDEX dark matter annual modulation

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Effect of Nb Addition on the Steam Oxidation Behavior and Kinetic of Fecral Alloys

SSRN

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SSRN 2023年

作者： Huang, Xuefei Tuo, Jingyi Chen, Guang Wang, Hui An, Xuguang Wang, Fu Zhang, Qiang College of Materials Science and Engineering Sichuan University Chengdu610065 China Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of China Chengdu610041 China Interdisciplinary Materials Research Center Institute for Advanced Study Chengdu University China Science and Technology on Surface Physics and Chemistry Laboratory Mianyang621908 China State Key Laboratory of Environment-friendly Energy Materials School of Materials Science and Engineering Southwest University of Science and Technology Mianyang621010 China China Nuclear Power Operation Technology Corporation. LTD Hubei Wuhan430223 China

The effects of Nb on the steam oxidation kinetic behavior of FeCrAl alloy during two different heating stages, i.e., the initial heating and the subsequent holding stage, were studied. Nb addition significantly decreased the weight gain at the holding stage. Nb addition also promoted the formation of Al2O3 and suppressed the growth of Fe and Cr oxides, resulting in the thinner oxide film in the heating stage. Also, the oxide film is much easier to wrinkle in the subsequent holding stage. In addition, the formation of Nb2O5 promotes the formation of discontinuous granular Al2O3 in oxide films and substrates. © 2023, The Authors. All rights reserved.

关键词： Oxide films

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Supercontinuum generation of two time-reversed shapes of Airy pulses in double zero dispersion medium 3

Supercontinuum generation of two time-reversed shapes of Air...

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3rd International Conference on Wireless Communications and Smart Grid, ICWCSG 2021

作者： Liu, Shuoyan Xiong, Guohao Yang, Muyan Tianjin University Qiushi Honors College Department of Electrical Information Engineering Tianjin300072 China UESTC University of Electronic Science and Technology of China Glasgow College Department of Communication Engineering Chengdu611731 China Chongqing University Electrical Engineering and Automation Chongqing400000 China

ISBN: (纸本)9781665425988

This paper uses the split-step Fourier method to study the dynamic transmission of positive and negative Airy pulses, which are different with time, in a media with two closely spaced zero-dispersion wavelengths. The study is under the influence of self-phase modulation (SPM), intrapulse Ramen scattering (IRS) and self-steepening (SS). We study the waveform and spectrogram of those two kinds of Airy pulses in the double zero-dispersion media, as well as their three-dimensional evolution diagrams. Then, we find that in the same condition, the positive Airy pulse can gain a broader supercontinuum and negative Airy pulse can acquire a flatter one. This paper is important on how to choose suitable initial parameters of inputting pulse to optimize supercontinuum. © 2021 IEEE.

关键词： Supercontinuum generation

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Analysis of Open Circuit Voltage and Internal Degradation under External Factors for EV Battery Considering Hysteresis

Analysis of Open Circuit Voltage and Internal Degradation un...

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2021 IEEE Sustainable Power and Energy Conference, iSPEC 2021

作者： Liu, Huiqiao Xiao, Qian Jiao, Zhipeng Meng, Jinhao Lu, Wenbiao Mu, Yunfei Jia, Hongjie Tianjin University of Technology Zhonghuan Information College Department of Automation Engineering Tianjin China Tianjin University Key Laboratory of Smart Grid Ministry of Education Tianjin China Hebei University of Technology State Key Laboratory of Reliability and Intelligence of Electrical Equipment Tianjin China Sichuan University College of Electrical Engineering Chengdu China

ISBN: (纸本)9781665414395

The open circuit voltage (OCV) tests and internal potential degradation diagnosis for vehicle application under different external factors has significance in understanding the relationship between the state of charge/ state of health of the battery and the external factors. In this paper, an analysis method is proposed for the OCV hysteresis of battery (cathode: LiFePO4 under the different external factors, including mechanical stress and temperature under driving conditions. Firstly, the main phenomenon inside the battery and impedance calculation methodology (ICM) is introduced. The ICM is used to describe the impedance conditions of ohmic resistance, charge transfer resistance, and Warburg resistance under external factors. Then, many experimental tests are conducted to investigate the OCV hysteresis and internal resistances under external factors. Finally, the results demonstrate the OCV hysteresis is mainly affected by low temperature especially. The electrochemical impedance spectroscopy (EIS) is influenced by both the mechanical stress and the temperature. The -10 °C temperature effect and extrusion stress have a huge impact on ohmic resistance;the 40°C temperature effect and 6-DOF vibration stress have great impact on charge transfer resistance. The 10°C and 0°C temperature effects have tremendous influence to Warburg resistance. In addition, according to the relationship between internal resistances or external factors and potential aging mechanisms, potential aging effect and pertinent effect, the internal pertinent degradation can be diagnosed qualitatively. © 2021 IEEE.

关键词： Electrochemical impedance spectroscopy

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The Calculation Method of Neutron Transport Equation and its Conjugate Equation Based on Finite Deconvolution Neural Network

SSRN

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SSRN 2022年

作者： Li, Xiangyu Cheng, Kun Huang, Tao Tan, Sichao Heilongjiang Provincial Key Laboratory of Nuclear Power System & Equipment Harbin Engineering University Harbin15001 China College of Nuclear Science and Technology Harbin Engineering University Harbin150001 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China

Aiming at the problem that the current neutron transport equation solving method, which is mainly numerical calculation, takes too long to calculate the inverse of the stiffness matrix, this paper designs a shallow neural network algorithm based on finite deconvolution neural network, which does not need to calculate the inverse matrix for the sti ness matrix or use other iterative algorithms. The algorithm uses a deconvolution neural network algorithm as the basic structure, replaces the deconvolution kernel with the finite volume method, and uses the calculation equation of reactor power as the loss function. The gradient descent method and the power residual are used to update the algorithm parameters to ensure algorithm convergence. The algorithm can use the neutron transport equation and its conjugate equation to calculate the distribution of neutron flux density and neutron importance in the space. © 2022, The Authors. All rights reserved.

关键词： Numerical methods

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Sensitivity Study of Thermal Hydraulics to Corrosion of Heat Exchange Tubes in Steam Generator

SSRN

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SSRN 2022年

作者： Wang, Weibing Cheng, Kun Wang, Bo Zhang, Meng Tian, Ruifeng College of Nuclear Science and Technology Harbin Engineering University Harbin150001 China Heilongjiang Provincial Key Laboratory of Nuclear Power System & Equipment Harbin Engineering University Harbin150001 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China

A leakage accident occurs in the circulating water system in PWRs, impurity ions enter the SG with the secondary circuit feed water and cause electrochemical corrosion of the heat transfer tubes(HTTs). Based on the hide out and return mathematical model in the SG, a coupled mathematical model of mass transfer-electromigration-hydrodynamics of impurity ions in the secondary boiling channel of SG is deduced. The accuracy of the mathematical model is verified by experiments, and the effects of heat flux density ( Pe q ), flow velocity ( Pe u ), impurity ion concentration ( Pe c ) and relative solubility of impurity ions ( K p ) on impurity ions migration and electrochemical corrosion are analyzed and discussed. The results show that P e q mainly controls the diffusion of impurity ions and thus affects the migration rate of impurity ions, and the mass transfer of impurity ions driven by Pe q can enhance the reduction of H + , thereby accelerating the corrosion rate of HTTs. The synergistic effect of convective mass transfer and electromigration during impurity ions migration is mainly affected by Pe u , and the electrochemical corrosion of the surface of HTTs is mainly controlled by charge transfer with the increase of Pe u . The Pe c on the surface of HTTs changes linearly with time, and the corrosion rate increases with the increase of Pe c . The corrosion rate of HTTs is proportional to K p , and K p is a main factor that causes different corrosion rates in different location of HTTs. In this paper, a coupled model for the sensitivity of thermal-hydraulic parameters ( Pe q , Pe u , Pe c and K p ) in SG to electrochemical corrosion of HTTs is proposed for the first time. The research results can provide important support for the development of corresponding response strategies, schemes for the life prediction of HTTs and the safety maintenance of nuclear power plants. © 2022, The Authors. All rights reserved.

关键词： Steam generators

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