检索结果-内蒙古大学图书馆

A Dynamic Current Balancing Method Using Full-Coupled Inductors in Paralleled Gate Branches

A Dynamic Current Balancing Method Using Full-Coupled Induct...

2024 International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, PCIM Europe 2024

作者： Lv, Jianwei Liu, Jiaxin Yan, Yiyang Zheng, Zexiang Liu, Baihan Chen, Cai Kang, Yong State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology China

ISBN: (纸本)9783800762620

Dynamic currents between paralleled SiC MOSFETs have to be balanced to extend the device's lifetime. Inserting driving-loop full-coupled inductors is a promising method with low volumes, but cannot reduce the current difference caused by unbalanced parasitic power-driving mutual inductances. To address the problem, this paper presents a method with full-coupled inductors in the paralleled gate branches, which can simultaneously reduce the unbalanced dynamic currents under unbalanced parasitic power inductances and power-driving mutual inductances. The experimental results show a 90.3 % turn-on current difference reduction compared to the non-optimized circuit, and a 71.5 % reduction compared to the existing method. © VDE VERLAG GMBH · Berlin · Offenbach.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Analytical analysis of hollow CORC cable under thermo-mechanical loads

引用

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

来源：评论

学校读者我要写书评

暂无评论

Supplementary Control for Mitigation of Successive Commutation Failures Considering the Influence of PLL Dynamics in LCC-HVDC Systems

引用

CSEE Journal of Power and Energy Systems 2022年第3期8卷 872-879页

作者： Jun Lu Xiaoming Yuan Meiqing Zhang Jiabing Hu State Key Laboratory of Advanced Electromagnetic Engineering and Technology and the School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhan430074China

Line commutated converter based high voltage direct current(LCC-HVDC)links are widely employed for long distance bulk power transmission and asynchronous alternating current(AC)grid ***,LCC-HVDC systems often suffer from commutation failures when AC voltage is distorted,oscillating or reduced by AC faults,which leads to overheating of converter valves and interruptions in transmitted *** of which can have an adverse impact on the safety and stability of the entire power *** paper proposes a supplementary control for mitigation of successive commutation failures on the basis of analyzing the influence of phase-locked loop(PLL)dynamics on the commutation *** analyzing the impact of PLL dynamics on the actual leading angle,it is found that changes in the AC voltage phase remarkably influence ***,the error between the AC voltage phase and PLL’s output angle is added to the output of the extinction angle or DC voltage control to mitigate the successive commutation failures of LCC-HVDC *** conducted on the CIGRE benchmark model in PSCAD/EMTDC validate the performance of the supplementary control,which effectively mitigates successive commutation failures.

关键词： Commutation failure dynamics LCC-HVDC mitigation PLL supplementary control

来源：评论

学校读者我要写书评

暂无评论

Fractional-order Virtual Inertia Control and Parameter Tuning for Energy-storage System in Low-inertia Power Grid

引用

Protection and Control of Modern Power Systems 2024年第5期9卷 70-83页

作者： Yukai Zeng Qiufan Yang Yujun Lin Yin Chen Xia Chen Jinyu Wen State Key Laboratory of Advanced Electromagnetic Engineering Huazhong University of Science and TechnologyWuhan 430074China Department of Electronic and Electrical Engineering University of StrathclydeGlasgow G11XWU.K.

As conventional synchronous generators are replaced by large-scale converter-interfaced renewa-ble-energy sources(RESs),the electric power grid en-counters the challenge of low rotational ***-quently,system frequency deviation is exacerbated and system instability may occur when the frequency deviates beyond the acceptable *** mitigate this effect,this study proposes a virtual inertia control(VIC)strategy based on a fractional-order derivative and controller parameter-tuning *** tuning method uses the stability boundary locus and provides a stability criterion for identifying the stability region in the parameter *** controller parameters are then optimized within the identified stability region to suppress frequency deviation and enhance system *** proposed controller and tuning method is applied to a battery energy-storage system(BESS)in a low-inertia power system with the integration of ***-domain simulations are carried out to verify the stability region and compare the per-formance of the optimized proposed controller to that of the traditional integral-order *** simulation results show that the stability-analysis method is effective and that the fractional-order VIC,tuned with the pro-posed method,outperforms the traditional method in both frequency-regulation performance and parametric robustness.

关键词： Virtual inertia control frequency regulation fractional-order controller stability region parameter tuning

来源：评论

学校读者我要写书评

暂无评论

High-safety and high-voltage lithium metal batteries enabled by nonflammable diluted highly concentrated electrolyte

引用

Nano Research 2024年第4期17卷 2638-2645页

作者： Han Zhang Ziqi Zeng Shuping Wang Yuanke Wu Changhao Li Mengchuang Liu Xinlan Wang Shijie Cheng Jia Xie State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Grid Anhui Electric Power Research Institute Anhui Province Key Laboratory of Electric Fire and Safety Protection(State Grid Laboratory of Fire Protection for Transmission and Distribution Facilities)Hefei 230601China School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074China

Lithium metal batteries(LMBs)show great promise for achieving energy densities over 400 Wh·kg^(-1).However,highly flammable organic electrolytes are a long-lasting problem that triggers safety hazards and hinders the commercial application of ***,a nonflammable diluted highly concentrated electrolyte(DHCE)with ethoxy(pentafluoro)cyclotriphosphazene(PFPN)as a diluent is developed to simultaneously achieve high safety and cycling stability of high-voltage *** optimal DHCE not only ensures reversible Li deposition/dissolution behavior with a superior average Coulombic efficiency(CE)over 99.1%on lithium metal anode(LMA),but also suppresses side reactions and stress crack on the LiCoO_(2)(LCO)under high cut-off *** newly developed DHCE exhibits high thermal stability,showing complete nonflammability and reduced heat generation between the electrolyte and delithiated LCO/cycled *** work offers an opportunity for rational designing nonflammable electrolytes toward high-voltage and safe LMBs.

关键词： lithium metal batteries thermal stability nonflammable electrolyte high-voltage phosphazene

来源：评论

学校读者我要写书评

暂无评论

A novel high-Cr CoNi-based superalloy with superior high-temperature microstructural stability, oxidation resistance and mechanical properties

引用

International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1373-1381页

作者： Xiaorui Zhang Min Zou Song Lu Longfei Li Xiaoli Zhuang Qiang Feng Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced MetalsUniversity of Science and Technology BeijingBeijing 100083China

A novel multicomponent high-Cr CoNi-based superalloy with superior comprehensive performance was prepared,and the evaluation of its high-temperature microstructural stability,oxidation resistance,and mechanical properties was conducted mainly using its cast polycrystalline *** results disclosed that the morphology of theγ′phase remained stable,and the coarsening rate was slow during the long-term aging at 900–1000℃.The activation energy forγ′precipitate coarsening of alloy 9CoNi-Cr was(402±51)kJ/mol,which is higher compared with those of CMSX-4 and some other Ni-based and Co-based ***,there was no indica-tion of the formation of topologically close-packed phases during this *** these factors demonstrated the superior microstructural stability of the *** mass gain of alloy 9CoNi-Cr was 0.6 mg/cm^(2) after oxidation at 1000℃ for 100 h,and the oxidation resistance was comparable to advanced Ni-based superalloys CMSX-4,which can be attributed to the formation of a continuous Al_(2)O_(3) protective ***,the compressive yield strength of this cast polycrystalline alloy at high temperatures is clearly higher than that of the conventional Ni-based cast superalloy and the compressive minimum creep rate at 950℃ is comparable to that of the conventional Ni-based cast superalloy,demonstrating the alloy’s good mechanical properties at high *** is partially because high Cr is bene-ficial in improving theγandγ′phase strengths of alloy 9CoNi-Cr.

关键词： CoNi-based superalloys microstructure coarsening oxidation mechanical properties

来源：评论

学校读者我要写书评

暂无评论

Improving the reliability of classical molecular dynamics simulations in battery electrolyte design

引用

Journal of Energy Chemistry 2025年第2期101卷 34-41,I0002页

作者： Xin He Yujie Zhang Haomiao Li Min Zhou Wei Wang Ruxing Wang Kai Jiang Kangli Wang State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina State Key Laboratory of Materials Processing and Die&Mould Technology College of Materials Science and EngineeringHuazhong University of Science and Technology Wuhan 430074HubeiChina Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy Hubei University of TechnologyWuhan 430068HubeiChina

Explorations into new electrolytes have highlighted the critical impact of solvation structure on battery performance,Classical molecular dynamics(CMD)using semi-empirical force fields has become an essential tool for simulating solvation ***,mainstream force fields often lack accuracy in describing strong ion-solvent interactions,causing disparities between CMD simulations and experimental *** some empirical methods have been employed in some of the studies to address this issue,their effectiveness has been *** CMD research,supported by quantum chemical calculations and experimental data,reveals that the solvation structure is influenced not only by the charge model but also by the polarization *** empirical approaches that focused solely on adjusting ion-solvent interaction strengths overlooked the importance of polarization *** on this insight,we propose integrating the Drude polarization model into mainstream force fields and verify its feasibility in carbonate,ether,and nitrile *** experimental results demonstrate that this approach significantly enhances the accuracy of CMD-simulated solvation *** work is expected to provide a more reliable CMD method for electrolyte design,shielding researchers from the pitfalls of erroneous simulation outcomes.

关键词： Electrolyte Classical molecular dynamics Solvation structure Simulations

来源：评论

学校读者我要写书评

暂无评论

Preparation of silver nanoparticles through the reduction of straw-extracted lignin and its antibacterial hydrogel

引用

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 504-514页

作者： Lou Zhang Shuo Li Fu Tang Jingkai Zhang Yuetong Kang Hean Zhang Lidong Li State Key Laboratory for Advanced Metals and Materials School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Silver nanoparticles(Ag NPs)have attracted attention in the field of biomaterials due to their excellent antibacterial ***,the reducing and stabilizing agents used for the chemical reduction of Ag NPs are usually toxic and may cause water *** this work,Ag NPs(31.2 nm in diameter)were prepared using the extract of straw,an agricultural waste,as the reducing and stabilizing *** analysis revealed that the straw extract contained lignin,the structure of which possesses phenolic hydroxyl and methoxy groups that facilitate the reduction of silver salts into Ag *** surfaces of Ag NPs were negatively charged due to the encapsulation of a thin layer of lignin molecules that prevented their *** the prepared Ag NPs were added to the precursor solution of acrylamide,free radical polymerization was triggered without the need for extra heating or light irradiation,resulting in the rapid formation of an Ag NP-polyacrylamide composite *** inhibition zone test proved that the composite hydrogel possessed excellent antibacterial ability due to the presence of Ag *** prepared hydrogel may have potential applications in the fabrication of biomedical materials,such as antibacterial dressings.

关键词： silver nanoparticles hydrogel straw extraction antibacterial

来源：评论

学校读者我要写书评

暂无评论

Virtual Impedance Control for Enhancing the Inertia Provision of Grid-forming Doubly-fed Induction Generator 10

Virtual Impedance Control for Enhancing the Inertia Provisio...

引用

10th IEEE International Power Electronics and Motion Control Conference, IPEMC 2024 ECCE Asia

作者： Liu, Yanjun Fang, Yifan Hu, Jiabing He, Wei Zhan, Meng Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering China

ISBN: (纸本)9798350351330

Grid-forming converters (GFMs) are regarded as a solution to enhancing the frequency support ability of the power grid. Applying the virtual synchronous generator (VSG) technology, GFM mimics the swing function of synchronous generators (SGs). It is found in this paper, however, that the inertia provision of VSG-based grid-forming doubly-fed induction generator (VSG-DFIG) is limited. The root cause is analyzed, indicating that the resistive-inductive internal impedance is not beneficial to providing power support under unbalanced active power disturbances. To address this issue, the terminal voltage controller (TVC) is modified by adding a virtual impedance control, rather than applying supplementary controllers on the active power control sections. The virtual impedance control optimizes the characteristic of the equivalent inertia of the DFIG and strengthens the inertial response. Finally, preliminary simulation results are presented to verify the feasibility of the proposed control strategy. © 2024 IEEE.

关键词： Synchronous generators

来源：评论

学校读者我要写书评

暂无评论

Interfacial modulation of nano Li_(7)La_(3)Zr_(2)O_(12) composite electrolytes prepared by solvent-free method

引用

Green Energy & Environment 2025年第3期10卷 528-536页

作者： Qigao Han Yaqing Guo Fuhe Wang Xuechun Lou Fengqian Wang Jun Zhong Jinqiao Du Jie Tian Weixin Zhang Shun Tang Shijie Cheng Yuancheng Cao Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan430074China Shenzhen Power Supply Co.Ltd. Shenzhen518001China

Solid-state batteries(SSBs) with high safety are promising for the energy fields,but the development has long been limited by machinability and interfacial ***,self-supporting,flexible Nano LLZO CSEs are prepared with a solvent-free method at 25℃.The 99.8 wt% contents of Nano LLZO particles enable the Nano LLZO CSEs to maintain good thermal stability while exhibiting a wide electrochemical window of 5.0 V and a high Li~+ transfer number of *** mean modulus reaches 4376 *** from the interfacial modulation,the Li|Li symmetric batteries based on the Nano LLZO CSEs show benign stability with lithium at the current densities of 0.1 mA cm^(-2),0.2 mA cm^(-2),and 0.5 mA cm^(-2).In addition,the Li|LiFePO_(4)(LFP) SSBs achieve favorable cycling performance:the specific capacity reaches128.1 mAh g^(-1) at 0.5 C rate,with a capacity retention of about 80% after 600 *** the further tests of the LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811) cathodes with higher energy density,the Nano LLZO CSEs also demonstrate good compatibility:the specific capacities of NCM811-based SSBs reach 177.9 mAh g^(-1) at 0.5 C rate,while the capacity retention is over 96% after 150 ***,the Li|LFP soft-pack SSBs verify the safety characteristics and the potential for application,which have a desirable prospect.

关键词： Solvent-free method Nano LLZO CSEs Interfacial modulation Cycling performance Safety characteristics

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：