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In-situ synthesis,microstructure,and properties of NbB_(2)-NbC-Al_(2)O_(3)composite coatings by plasma spraying

Journal of Advanced Ceramics 2022年第8期11卷 1263-1278页

作者： Xiaolong WANG Yong YANG Shitong JIA Yanwei WANG Yuduo MA Yuhang CUI Xingyu WANG Wenwei SUN Liang WANG key Lab.for New Type of Functional Materials in Hebei Province School of Materials Science and EngineeringState Key Laboratory of Reliability and Intelligence of Electrical EquipmentTianjin Key Laboratory of Materials Laminating Fabrication and Interface Control TechnologyHebei University of TechnologyTianjin 300401China Integrated Computational Materials Research Centre Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899China

The high melting point and strong chemical bonding of NbB_(2)pose a great challenge to the preparation of high-density nanostructured NbB_(2)composite ***,we report a novel,simple,and efficient method to fabricate in-situ NbB_(2)–NbC–Al_(2)O_(3)composite coating by plasma spraying Nb_(2)O_(5)–B_(4)C–Al composite powder,aiming at realizing the higher densification and ultra-fine microstructure of NbB_(2)composite *** microstructure and properties of in-situ NbB_(2)–NbC–Al_(2)O_(3)composite coating were studied comparatively with ex-situ NbB_(2)–NbC–Al_(2)O_(3)composite coating(plasma spraying NbB_(2)–NbC–Al_(2)O_(3)composite powder).The reaction mechanism of Nb_(2)O_(5)–B_(4)C–Al composite powder in plasma jet was analyzed in *** results showed that the in-situ nanostructured NbB_(2)–NbC–Al_(2)O_(3)composite coating presented a lower porosity and superior performance including higher microhardness,toughness and wear resistance compared to the plasma sprayed ex-situ NbB_(2)–NbC–Al_(2)O_(3)coating and other boride composite *** of the in-situ NbB_(2)–NbC–Al_(2)O_(3)coating was attributed to the low melting point of Nb_(2)O_(5)–B_(4)C–Al composite powder and the exothermic effect of in-situ *** superior performance was ascribed to the density improvement and the strengthening and toughening effect of the nanosized *** in-situ reaction path could be expressed as:Nb_(2)O_(5)+Al®Nb+Al_(2)O_(3),and Nb+B_(4)C®NbB_(2)+NbC.

关键词： NbB_(2)-NbC-Al_(2)O_(3)composite coating plasma spray in-situ synthesis Nb_(2)O_(5)-B_(4)C-Al system

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reliability Analysis of a Switched Reluctance Starter/Generator

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Protection and Control of Modern Power Systems 2024年第1期9卷 112-121页

作者： Hao Chen Fan Yang Lijun Xu Qiwei Lu Xiqiang Chang Xing Wang Lijiang Dong Yi Wen Jiang Chen Gang Miao Jianmin Hu Guanjun Wang Wei Li Xiaohua Bao School of electrical Engineering China University of Mining and TechnologyXuzhou 221116China Xinjiang Institute of Engineering Urumqi 830000China International Joint Research Center of Central and Eastern European Countries on New Energy Electric Vehicle Technology and equipment Xuzhou 221008China International Cooperation Joint laboratory of New Energy Power Generation and Electric Vehicles of Jiangsu Province Colleges and Universities Xuzhou 221008China School of Information and electrical Engineering China University of Mining and TechnologyXuzhouChina China University of Mining and Technology(Beijing) BeijingChina state Grid Xingjiang Electric Power Co. Ltd.UrumqiXinjiangChina China University of Mining and Technology XuzhouChina state Grid Xinjiang Company Limited Electric Power Research Institute UrumqiXinjiangChina Xinjiang Fukang Pumped Storage Power Company Limited UrumqiXinjiangChina state Grid Urumqi Electric Power Supply Company UrumqiXinjiangChina Wuxi Inspection and Testing Certification Research Institute WuxiJiangsuChina Anhui Wannan Electric Machine Co. Ltd.WannanAnhuiChina Hefei University of Technology in electrical and Automation Engineering

In this paper,the combined k-out-of-n:G model and reliability block diagram model is used to analyze the reliability of a switched reluctance starter/generator ***,the different operational modes of a switched reluctance motor starter/generator are analyzed,and the fault states of the system are briefly *** the fault criteria of the system in different operational states are put ***,a relia-bility block diagram model is established to calculate the system-level reliability,and the k-out-of-n:G model is adopted to analyze the reliability of each part of the switched reluctance starter/generator *** verify effectiveness,the first-order Markov model is also used to analyze the reliability of each part of the switched reluc-tance starter/generator *** the compu-tational complexity and accuracy of the system,the k-out-of-n:G model is more suitable for system component level reliability ***,a 6/4 switched reluctance motor is used as the simulated and experimental platform *** final results verify the effectiveness of the reliability analysis model.

关键词： system switched generator

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The Averaged-value Model of a Flexible Power Electronics Based Substation in Hybrid AC/DC Distribution Systems

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CSEE Journal of Power and Energy Systems 2022年第2期8卷 452-464页

作者： Hong Liu Zhanfeng Deng Xialin Li Li Guo Di Huang Shouqiang Fu Xiangyu Chen Chengshan Wang the key laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China the state key laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research InstituteBeijing 100220China the state Grid Jibei Electric Power Economic Research Institute Beijing 100038China state key laboratory of reliability and intelligence of electrical equipment Hebei University of TechnologyTianjinChina the Guangzhou Power Supply Bureau of Guangdong Grid Co. Ltd.Guangzhou 510620China

The concept of a flexible power electronics substation(FPES)was first applied in the Zhangbei DC distribution network demonstration *** a multi-port power electronics transformer(PET)with different AC and DC voltage levels,the FPES has adopted a novel topology integrating modular multilevel converter(MMC)and four-winding medium frequency transformer(FWMFT)based multiport DC-DC converter,which can significantly reduce capacitance in each sub-module(SM)of a MMC and also save space and *** this paper,in order to accelerate speed of electromagnetic transient(EMT)simulations of FPES based hybrid AC/DC distribution systems,an averaged-value model(AVM)is proposed for efficient and accurate representation of *** that all SM capacitor voltages are perfectly balanced in the MMC,then the MMC behavior can be modeled using controlled voltage sources based on modulation voltages from control *** terms of the averaged current transfer characteristics among the windings of the FWMFT,we consider that all multiport DC-DC converters are controlled with the same dynamics,a lumped averaged model using controlled current and voltage sources has been developed for these four-port DC-DC converters connected to the upper or lower arms of the *** presented FPES AVM model has been tested and validated by comparison with a detailed IGBT-based EMT *** show that the AVM is significantly more efficient while maintaining its accuracy in an EMT simulation.

关键词： Averaged-value model(AVM) flexible power electronics substation(FPES) four-winding medium frequency transformer(FWMFT) hybrid AC/DC distribution systems modular multilevel converter(MMC) multiport DC-DC converter

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Electromagnetic Performance Analysis of Flux-Switching Permanent Magnet Tubular Machine with Hybrid Cores

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CES Transactions on electrical Machines and Systems 2020年第1期4卷 43-52页

作者： Shaopeng Wang Chengcheng Liu Youhua Wang Gang Lei Youguang Guo Jianguo Zhu state key laboratory of reliability and intelligence of electrical equipment Hebei University of Technology and Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei ProvinceHebei University of TechnologyTianjin300130China School of electrical and Data Engineering University of Technology SydneyNSW 2007Australia school of electrical and information engineering University of SydenyNSW 2007Australia

The performance of traditional flux switching permanent magnet tubular machine(FSPMTM)are improved by using new material and structure in this *** existing silicon steel sheet making for all mover cores or part of stator cores are replaced by soft magnetic composite(SMC)cores,and the lamination direction of the silicon steel sheet in stator cores have be *** eddy current loss of the machine with hybrid cores will be reduced greatly as the magnetic flux will not pass through the silicon steel sheet *** order to reduce the influence of end effect,the unequal stator width design method is *** the new design,the symmetry of the permanent magnet flux linkage has been improved greatly and the cogging force caused by the end effect has been *** 2-D and 3-D finite element methods(FEM)are applied for the quantitative analysis.

关键词： Flux switching permanent magnet tubular machine soft magnetic composite(SMC) hybrid cores unequal width stator finite element method(FEM).

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Gravity compensation method via magnetic quasi-zero stiffness combined with a quasi-zero deformation control strategy

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Science China(Technological Sciences) 2022年第8期65卷 1738-1748页

作者： ZHOU Rui ZHOU YiFan CHEN XueDong HOU WeiJie WANG Chang WANG Hao JIANG Wei state key laboratory of Digital Manufacturing equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China Tianjin key laboratory of Microgravity and Hypogravity Environment Simulation Technology Tianjin Institute of Aerospace Mechanical and Electrical EquipmentTianjin 300301China Institute of Artificial intelligence Huazhong University of Science and TechnologyWuhan 430074China

Gravity compensation refers to the creation of a constant supporting force to fully or partly counteract the gravitational force for ground verification to simulate the spacecraft dynamics in outer space with zero-or micro-gravity. Gravity compensation is usually implemented via a very low stiffness suspension/supporting unit, and a servo system in series is adopted to extend the simulation range to hundreds of millimeters. The error of suspension force can be up to tens of Newton due to the contact/friction in the suspension/supporting unit and the error of the force/pressure sensor. It has become a bottleneck for the ground verification of spacecraft guidance, navigation, and control systems with extreme requirements, such as tons of payload and fine thrust in sub-Newtons. In this article, a novel gravity compensation method characterized by quasi-zero stiffness plus quasi-zero deformation(QZS-QZD) is proposed. A magnetic negative stiffness spring in parallel with positive springs and aerostatic bearing is adopted to form a QZS supporting unit, and disturbance forces, such as contact or friction, can be eliminated. The deformation of the QZS supporting unit is measured via a displacement sensor, and the QZD control strategy is applied to guarantee the force error of gravity compensation to be less than sub-newtons and irrelevant to the payload. The principle of gravity compensation with QZS-QZD is analyzed, and performance tests on a prototype are carried out. The results show that when the spacecraft moves smoothly, the absolute force error is less than 0.5 N, the relative error of gravity compensation is less than 0.1%, and when collisions with other objects occur, the relative errors are 0.32% and 0.65%. The proposed method can significantly improve the gravity compensation accuracy in comparison with conventional approaches.

关键词： gravity compensation zero-gravity ground verification quasi-zero stiffness quasi-zero deformation

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High-temperature strength-coercivity balance in a FeCo-based soft magnetic alloy via magnetic nanoprecipitates

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Journal of Materials Science & Technology 2021年第22期81卷 36-42页

作者： Kaisheng Ming Shuimiao Jiang Xiaoyuan Niu Bo Li Xiaofang Bi Shijian Zheng state key laboratory of reliability and intelligence of electrical equipment Hebei University of TechnologyTianjin300130China Tianjin key laboratory of Materials Laminating Fabrication and Interface Control Technology School of Materials Science and EngineeringHebei University of TechnologyTianjin300130China key laboratory of Aerospace Materials and Performance(Ministry of Education) School of Materials Science and EngineeringBeihang UniversityBeijing100191China School of Chemical Engineering and Technology Hebei University of TechnologyTianjin300130China

Precipitation strengthening is an effective approach to enhance the strength of soft magnetic alloys for applications at high temperatures,while inevitably results in deterioration in coercivity due to the pinning effect on the domain wall ***,we realize a good combination of high-temperature strength and ductility(ultimate tensile strength of 564 MPa and elongation of~20%,respectively)as well as low coercivity(6.97 Oe)of FeCo-2V-0.3Cr-0.2Mo soft magnetic alloy through introducing high-density magnetic *** magnetic nanoprecipitates are characterized by FeCo-based phase with disordered body-centered cubic structure,which enables the alloy to have a low *** addition,these nanoprecipitates can impede the dislocation motion and suppress the brittle fracture,which lead to a high tensile strength and *** work provides a guideline to enhance strength and ductility while maintaining low coercivity in soft magnetic alloys via magnetic nanoprecipitates.

关键词： FeCo-based soft magnetic alloys Strength Ductility Coercivity Magnetic nanoprecipitates

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Fuzzy Logic-based Management of Hybrid Distribution Transformers Using LoRa Technology

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CSEE Journal of Power and Energy Systems 2023年第3期9卷 1129-1138页

作者： Lishi Zhang Deliang Liang Hua Liu Yibin Liu Dawei Li Chuankai Yang state key laboratory of electrical Insulation and Power equipment Shaanxi Key Laboratory of Smart GridSchool of Electrical EngineeringXi’an Jiaotong UniersityXi’an 710049China state Grid Shaanxi Electric Power Research Institute Xi’an 710100China

Hybrid distribution transformers(HDTs)have better performance than traditional distribution transformers in improving power quality through reducing harmonics,unbalance,voltage fluctuations and low power factors in future smart power distribution *** order to increase the service life and reliability of hybrid distribution transformers,this paper proposes a remote management system using LoRa technology based on fuzzy *** based on a fuzzy logic judgment system(FLJS)replaces the Boolean logic with fuzzy logic and several power quality problems including power factors,load-side current harmonics and voltage unbalance are considered,as well as grid-side voltage deviation and *** management system can dynamically adjust the working states of HDT according to the output results of the FLJS to reduce the use time of power electronic *** to the application of LoRa,this management system can remotely adjust the parameters of the FLJS in real time for different distribution network nodes to avoid frequent switching of HDT working *** addition,it is able to remotely monitor the real-time working states and fault states of HDT to reduce recovery time and maintenance costs in case of HDT ***,simulation and experimental results are presented to verify the effectiveness of the proposed management system for HDT.

关键词： Fuzzy logic judgment system hybrid distribution transformer LoRa Remote management

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Tuning the bandgap of double perovskites

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Journal of Semiconductors 2021年第12期42卷 6-8页

作者： Yu Zou Wenjin Yu Lixiu Zhang Cuncun Wu Lixin Xiao Liming Ding state key laboratory for Mesoscopic Physics Department of PhysicsPeking UniversityBeijing 100871China School of Materials Science and Engineering State Key Laboratory of Reliability and Intelligence of Electrical EquipmentHebei University of TechnologyTianjin 300130China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

With great achievements in efficiency,stability,and large-scale preparation of perovskite solar cells(PSCs),the com-mercialization of PSC is ongoing,but there is still an issue on lead *** lead content in the device is low,the water solubility of lead salts leads to potential environmental *** present,the non-lead perovskites studied in-clude:divalent metal perovskite(e.g.,Sn^(2+),Ge^(2+),Cu^(2+)),trivalent metal perovskite(e.g.,Bi^(3+),Sb^(3+),In^(3+)),tetravalent met-al double perovskite(e.g.,Sn^(4+),Pd^(4+),Ti^(4+),Pt^(4+))and mono-trivalent mixed double perovskite(e.g.,Ag+and Bi^(3+),Ag+and In^(3+),Ag^(+)and Sb^(3+)).Their properties are summarized in Table *** the first report on non-lead double perovskite Cs2AgBiBr6 in 2016^([1]).

关键词： perovskite double valent

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Simulation study of integrated‐gate‐commutated‐thyristor based superconducting hybrid direct current circuit breaker

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High Voltage 2023年第6期8卷 1275-1284页

作者： Muhammad Junaid Wenqing Yu Shuzhi Cao Xiaolong Yu Dongsheng Yu Weilin Zong Jianhua Wang School of electrical Engineering China University of Mining and TechnologyXuzhouChina state key laboratory of electrical Insulation and Power equipment Xi'an Jiaotong UniversityXi'anChina

With the development of a distributed generation,direct current(DC)load and energy‐storage equipment,voltage‐source‐converter‐based medium‐voltage DC systems(VSC‐MVDC)have attracted more attention due to its low power consumption,high reliability,independent power control and so ***,VSC‐MVDC has the problem of DC fault isolation,which requires the fast‐acting DC circuit‐breakers to isolate faulty lines and ensure low *** problem can be solved by coordinating resistive type superconducting‐fault‐current‐limiter(R‐SFCL)and integrated‐gate‐commutated‐thyristor(IGCT)based hybrid circuit *** on this,IGCT based superconducting DC circuit breaker(SDCCB)is proposed and *** R‐SFCL with IGCT could realise large current limiting and interruption and ensure low *** addition,the IGCT based hybrid DC circuit breaker(IGCT‐HDCCB)is compared with the traditional insulated gate bipolar transistor(IGBT)based hybrid DC circuit breaker(IGBT‐HDCCB)to evaluate which circuit breaker is more suitable for VSC‐*** results show that,coordination based on R‐SFCL and SDCCB,the fault current is successfully limited from 17.6 to 2.1 kA,and then inter-rupted within 3.8 *** addition,IGCT‐HDCCB overcomes the disadvantage that IGCT has less interrupting capacity than IGBT,retains the advantage of low cost of IGCT and is more suitable for MVDC system.

关键词： bipolar fault overcome

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Matched MnO@C anode and porous carbon cathode for Li-ion hybrid supercapacitors

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Rare Metals 2023年第6期42卷 1959-1968页

作者： Cui-Hua An Yue-Qing Li Shuai Wu Ling-Xiao Gao Li-Yang Lin Qi-Bo Deng Ning Hu key laboratory of Hebei Province on Scale-Span Intelligent equipment Technology and School of Mechanical EngineeringHebei University of TechnologyTianjin300401China Wuhan Green Power Hydrogen Energy Technology Co. LTDWuhan430000China The Green Aerotechnics Research Institute of Chongqing Jiaotong University Chongqing401120China state key laboratory of reliability and intelligence electrical equipment Hebei University of TechnologyTianjin300130China Institute of Materials Physics and Technolgy Hamburg University of TechnologyHamburg21073Germany

Holding a promise of achieving high power and energy densities,Li-ion hybrid electrochemical capacitors present a crucial future direction for energy storage ***,technical challenges remain to appropriately couple both high-power capacitor-type and high-energy battery-type electrode materials within a same *** addition,the current electrode materials in the device are usually prepared separately,which leads to lengthy preparation,time-consuming and *** this work,we report a simple method to prepare porous carbon materials(PC) with and without MnO nanoparticle cores,which function as very unique anode/cathode pairs for very high-performance Li ion hybrid *** the respective merits of high Li storage capacity from the MnO@C anode and high-rate performance from the PC cathode,the resulted device exhibits a remarkable energy density of 89 Wh·kg^(-1)(at 48 W·kg^(-1)) and can reach a battery-inaccessible power density of 18 kW·kg^(-1)(at 45Wh·kg^(-1)).

关键词： Li-ion hybrid supercapacitors Structural affinity MnO@C Porous carbon(PC) High energy density

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