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Analytical analysis of hollow CORC cable under thermo-mechanical loads

Superconductivity 2023年第1期5卷 26-39页

作者： Xianhao Li Yuejin Tang Ying Xu Li Ren State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan 430074China School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhan 430074China

According to engineering experience,the axial shrinkage caused by the refrigerant seriously endangers the performance of long‐distance conductor on round core(CORC)*** outage maintenance of high‐temperature superconducting(HTS)cables is inevitable,providing appropriate compensation for cyclic temperature is one of the key technologies in the actual application of power ***,this paper presents an analytical solution for hollow CORC cables under thermo‐mechanical ***,regarded as an axisymmetric composite structure,the radial temperature distribution of CORC cable under Dirichlet boundary or mixed boundary conditions was ***,assuming cable ends were axially fixed,a recursive method without variables is used to evaluate its displacement,strains,and ***,an algebraic method with axial strain as a variable is developed to analyze the mechanical behavior of the CORC cable more ***,concluded from the above derivation,a matrix equation is constructed based on continuity equations and boundary conditions,which applies to isotropic and orthotropic materials with *** results show that the analytical solution agrees with finite element method(FEM)*** to the trial results of a 360 m CORC cable,the calculation error of axial shrinkage is within 1.63 cm,and the relative error is within 6.1%.In addition,the recursive method is the fastest to calculate axial strain,while the matrix method has a significant efficiency advantage in calculating the stresses and strains of each layer.

关键词： CORC cable Analytical solution Thermo‐mechanical loads Axial shrinkage Recursive method Algebraic method

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Active metal brazing of SiO2–BN ceramic and Ti plate with Ag–Cu–Ti＋BN composite filler

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Journal of Materials Science & technology 2017年第11期33卷 1392-1401页

作者： Z.W.Yang C.L.Wang Y.Wang L.X.Zhang D.P.Wang J.C.Feng Tianjin Key Lab of Advanced Joining Technology School of Materials Science and Engineering Tianjin University Tianjin 300072 China State Key Lab of Advanced Welding andJoining Harbin Institute of Technology Harbin 150001 China

SiO2–BN ceramic and Ti plate were joined by active brazing in vacuum with Ag–Cu–Ti＋BN composite *** effect of BN content,brazing temperature and time on the microstructure and mechanical properties of the brazed joints was *** results showed that a continuous Ti N–Ti B2reaction layer formed adjacent to the SiO2–BN ceramic,whose thickness played a key role in the bonding *** Ti–Cu compound layers,Ti2Cu,Ti3Cu4,Ti Cu2and Ti Cu4,were observed to border Ti substrate due to the strong affinity of Ti and Cu compared with *** central part of the joint was composed of Ag matrix,over which some fine-grains *** added BN particles reacted with Ti in the liquid filler to form fine Ti B whiskers and Ti N particles with low coefficients of thermal expansion（CTE）,leading to the reduction of detrimental residual stress in the joint,and thus improving the joint *** maximum shear strength of 31 MPa was obtained when 3 wt%BN was added in the composite filler,which was 158%higher than that brazed with single Ag–Cu–Ti filler *** morphology and thickness of the reaction layer adjacent to the parent materials changed correspondingly with the increase of BN content,brazing temperature and holding *** on the correlation between the microstructural evolution and brazing parameters,the bonding mechanism of SiO2–BN and Ti was discussed.

关键词： SiO2–BN ceramic BN particles Microstructure Mechanical properties

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Coordinated Optimization of Multi-energy Generation Systems Considering the Health Damages of Coal-fired Pollutant Dispersion

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CSEE Journal of Power and Energy Systems 2022年第6期8卷 1613-1622页

作者： Suhua Lou Yinhao Yang Yanjie Liang Yaowu Wu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China Power Dispatch and Control Center of China Southern Power Grid Guangzhou 510623China

Pollutants emitted from coal-fired power plants lead to the deterioration of air quality in developing countries,and contribute to both mortality and *** improve air quality from power generation,new dispatch strategies incorporated with air pollution dispersion models should be *** paper takes into account the impact of meteorological variations on spatio-temporal dispersion of *** on the coal-fired pollutant concentration estimated by the Gaussian plume dispersion model,exposure-response functions are used to quantify the resulting health ***,the corresponding economic costs of health damages are incorporated to penalize the power *** generation costs and economic costs of health damages,this paper formulates a twostage stochastic optimization model of a multi-energy generation system including coal units,gas units,and photovoltaic ***,numerical studies based on a modified IEEE 14-node system are performed for illustration and validation.

关键词： Coal-fired pollutant dispersion exposure-response functions Gaussian plume model meteorological variations multi-energy generation system

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Prediction of Equivalent Icing Thickness of Transmission Lines in Distribution Network 9

Prediction of Equivalent Icing Thickness of Transmission Lin...

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9th Asia Conference on Power and Electrical engineering, ACPEE 2024

作者： Xu, Jiaxin Li, Dayi Dai, Yufeng Xie, Siqi Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350309638

Aiming at the problem that the time series forecasting method will produce a certain degree of lag due to its series autocorrelation, the multivariate equivalent ice thickness prediction using meteorological data as the feature is used. Aiming at the problem that the prediction accuracy of ice thickness is not high, the attention mechanism is used to assign adaptive weights to multi-dimensional feature parameters and time steps to highlight important information in different feature dimensions and time steps. At the same time, due to the change of ice cover with time, a Bi-directional Long Short-term Memory (Bi-LSTM) is used to establish an ice cover prediction model to make use of the past and future information provided at each time point in the process, and for the parameter selection problem of Bi-LSTM, the sparrow search algorithm (SSA) is used to select the hyperparameters to reduce the error caused by human intervention, and then improve the accuracy of line equivalent ice thickness prediction, and finally verify the validity of the model through experimental results. © 2024 IEEE.

关键词： Long short-term memory

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Progress in silicon-based reconfigurable and programmable all-optical signal processing chips

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Frontiers of optoelectronics 2025年第1期18卷 10页

作者： Jing Xu Wenchan Dong Qingzhong Huang Yujia Zhang Yuchen Yin Zhenyu Zhao Desheng Zeng Xiaoyan Gao Wentao Gu Zihao Yang Hanghang Li Xinjie Han Yong Geng Kunpeng Zhai Bei Chen Xin Fu Lei Lei Xiaojun Wu Jianji Dong Yikai Su Ming Li Jianguo Liu Ninghua Zhu Xuhan Guo Heng Zhou Huashun Wen Kun Qiu Xinliang Zhang Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan 430074 China. Optics Valley Laboratory Wuhan 430074 China. State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China. Key Lab of Optical Fiber Sensing and Communication Networks University of Electronic Science and Technology of China Chengdu 611731 China. Institute of Intelligent Photonics Nankai University Tianjin 300071 China. Key Laboratory of Optoelectronic Materials and Devices Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China. College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060 China. School of Electronic and Information Engineering Beihang University Beijing 100191 China. State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China. Guoxuhan@***. Key Lab of Optical Fiber Sensing and Communication Networks University of Electronic Science and Technology of China Chengdu 611731 China. zhouheng@***. Institute of Intelligent Photonics Nankai University Tianjin 300071 China. whs@***. Key Laboratory of Optoelectronic Materials and Devices Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China. whs@***. Key Lab of Optical Fiber Sensing and Communication Networks University of Electronic Science and Technology of China Chengdu 611731 China. kqiu@***. Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan 430074 China. xlzhang@***. Optics Valley Laboratory Wuhan 430074 China. xlzhang@***.

Taking the advantage of ultrafast optical linear and nonlinear effects, all-optical signal processing (AOSP) enables manipulation, regeneration, and computing of information directly in optical domain without resorting to electronics. As a promising photonic integration platform, silicon-on-insulator (SOI) has the advantage of complementary metal oxide semiconductor (CMOS) compatibility, low-loss, compact size as well as large optical nonlinearities. In this paper, we review the recent progress in the project granted to develop silicon-based reconfigurable AOSP chips, which aims to combine the merits of AOSP and silicon photonics to solve the unsustainable cost and energy challenges in future communication and big data applications. Three key challenges are identified in this project: (1) how to finely manipulate and reconfigure optical fields, (2) how to achieve ultra-low loss integrated silicon waveguides and significant enhancement of nonlinear effects, (3) how to mitigate crosstalk between optical, electrical and thermal components. By focusing on these key issues, the following major achievements are realized during the project. First, ultra-low loss silicon-based waveguides as well as ultra-high quality microresonators are developed by advancing key fabrication technologies as well as device structures. Integrated photonic filters with bandwidth and free spectral range reconfigurable in a wide range were realized to finely manipulate and select input light fields with a high degree of freedom. Second, several mechanisms and new designs that aim at nonlinear enhancement have been proposed, including optical ridge waveguides with reverse biased PIN junction, slot waveguides, multimode waveguides and parity-time symmetry coupled microresonators. advanced AOSP operations are verified with these novel designs. Logical computations at 100 Gbit/s were demonstrated with self-developed, monolithic integrated programmable optical logic array. High-dimensional multi-valu

关键词： All-optical signal processing (AOSP) High-density optoelectronic packaging Low-loss silicon waveguides Optical nonlinearity Optical regeneration Programmable optical logic array Reconfigurable optical filters

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Characterization,Removal and Evaluation of Oxide Film in the Diffusion Bonding of Zr_(55)Cu_(30)Ni_5Al_(10) Bulk Metallic Glass

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Journal of Materials Science & technology 2014年第7期30卷 722-730页

作者： Haiyan Chen Jian Cao Xiaoguo Song Jiakun Liu Jicai Feng State Key Lab of Advanced Welding and Joining Harbin Institute of Technology School of Materials Science and Engineering Harbin Institute of Technology at Weihai

The composition of oxide film of ZrssCu3oNi5Al10 bulk metallic glass was identified by X-ray photoelectron spectroscopy. In addition, the relatively sound joints of bulk metallic glass without macroscopic deformation were obtained by removing the oxide film before diffusion bonding. The joint interfaces were observed by scanning electron microscopy and atomic force microscopy. The hardness of joints near the interface was higher than that far away from the interface, which is attributed to the difference of structural relaxation. According to the result of micro-focused X-ray diffractometry and transmission electron microscopy, the joints retained the amorphous structure when the holding time is less than 20 min. The surface area fraction of oxide film on the interface of joints was detected by ultrasonic inspection. Moreover, the surface area fraction of oxide film is in excellent agreement with the theoretical value calculated by shear strength. The result indicated that surface oxide film is the dominant barrier on the diffusion bonding of bulk metallic glass rather than low atomic diffusion coefficient.

关键词： Bulk metallie glass Diffusion Surface Diffusion bonding Oxide film

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Voltage Distribution Characteristic of a Flux-Coupling Superconducting Fault Current Limiter in Different Operating Conditions

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IEEE Transactions on Applied Superconductivity 2017年第4期27卷 1-6页

作者： Yang, Zhangwei Li, Jingdong Yan, Sinian Zhang, Lihui Yu, Bing Ren, Li Liao, Yuxiang State Key Laboratory of Advanced Electromagnetic Engineering and Technology R and D Center of Applied Superconductivity Huazhong University of Science and Technology Wuhan430074 China

The voltage distribution on the superconducting coils of a 400 V/20 A flux-coupling superconducting fault current limiter (FC-SFCL) is analyzed. The FC-SFCL, consisting of 16 superconducting coils, normally produces low impedance. When a fault occurs, a branch disconnects from the coupling circuit. Then the FC-SFCL produces high impedance and operates in the limiting condition. In different conditions, the voltage distribution on each coil is different and may be uneven. This will affect the structural design and quench detection of the FC-SFCL magnet. Thus, analyzing voltage distribution is necessary to ensure the reliability of the FC-SFCL. The methods of analysis are the finite element method and require further experimentation. The results of the simulation and experiment are in accordance with each other to some degree. © 2002-2011 IEEE.

关键词： Finite element method

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Transient stability risk assessment of power systems incorporating wind farms

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Journal of Modern Power Systems and Clean Energy 2013年第2期1卷 134-141页

作者： Lu MIAO Jiakun FANG Jinyu WEN Weihua LUO State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China Liaoning Electric Power Company Limited Shenyang 110006China

Large-scale wind farm integration has brought several aspects of challenges to the transient stability of power *** paper focuses on the research of the transient stability of power systems incorporating with wind farms by utilizing risk assessment *** detailed model of double fed induction generator has been *** penetration variation and multiple stochastic factors of power systems have been *** process of transient stability risk assessment based on the Monte Carlo method has been described and a comprehensive risk indicator has been *** investigation has been conducted into an improved 10-generator 39-bus system with a wind farm incorporated to verify the validity and feasibility of the risk assessment method proposed.

关键词： Wind farm integration Transient stability DFIG Risk indicator Wind farm location

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Traveling-wave-based fault location in electrical distribution systems with digital simulations

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Telkomnika (Telecommunication Computing Electronics and Control) 2014年第2期12卷 297-304页

作者： Tang, Jinrui Yin, Xianggen Zhang, Zhe State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Luoyu Road 1037 Wuhan 430074 Hubei Province China

Traveling-wave-based fault location in electrical distribution systems is an important safeguard for the distribution network reliability. The effectiveness of the methods is verified directly in power grid in the early stages, while different fault types can't appear in a short time. And normal dynamic physical simulation cannot meet the teaching demand either because of the limitation of transmission line model and other factors. So PSCAD/EMTDC and MATlab are used to illustrate the the fault location methods in this paper, which can promote the traveling-wave-based fault-location technology. Meanwhile, the traveling-wave-based fault-location method based on characteristic frequencies is analyzed in this paper.

关键词： Electric lines

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Heat Pumps in Denmark:Current Situation in Providing Frequency Control Ancillary Services

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CSEE Journal of Power and Energy Systems 2022年第3期8卷 769-779页

作者： Menglin Zhang Qiuwei Wu Theis Bo Harild Rasmussen Xiaodong Yang Jinyu Wen Department of Electrical Engineering Centre for Electric Power and EnergyTechnical University of DenmarkKgs.LyngbyDenmark State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China

-The Danish government set an ambitious goal to achieve a fully renewable-based energy system by *** this context,the integrated electricity and heating system is undergoing rapid development in Denmark as a promising way to accommodate the ever-growing renewable energy sources(RESs).The electric heat pumps(HPs),coupled with the power and heat sectors,can propagate the flexibility on the heat consumer side to the power system operations,playing an important role of improving system flexibility and balancing the variability of the *** this paper,the current development situation of HPs in Denmark is analyzed,including both the large-scale HPs in the district heating system and individual HPs on the residential *** possibility of using HPs to provide frequency control ancillary service(FCAS)is analyzed according to the market and technical requirements of the FCAS in the Danish transmission system and experimental results of representative demonstration projects of HPs.A comprehensive analysis of the advantages,barriers,future prospects,and challenges for using HPs to provide the FCAS are carried out from the perspectives of different entities.

关键词： Danish energy system frequency control ancillary service individual heat pumps integrated electricity and heat system large-scale heat pumps power to heat

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