检索结果-内蒙古大学图书馆

4th IEEE China International Youth Conference on Electrical engineering, CIYCEE 2023

作者： Tian, Peishuai Zhou, Xingyu Hu, Yanqi Xiong, Yongqian Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9798350305562

In the paper, we design a new deep learning (DL) network to analysis and design the electromagnetically induced transparency (EIT) metamaterials. The network is divided into two parts: dimensionality reduction reconstruction network and inverse design. The dimensionality reduction reconstruction network mainly deals with high-dimensional input data. In the inverse design, we combine the convolutional neural network (CNN) and long short-term memory (LSTM) to predict the EIT metamaterial structure. The inverse design has reduced the mean square errors (MSE) on the validation set to 0.0032 and predict the structure parameters within the error of 0.26 μm, which are better than other reports. Besides, we avoid the overfitting problem and one-to-many problem to some extent. By comparing the spectra of real and predicted parameters on the validation set, we are confident that the network will pave a new path for designing EIT metamaterials. © 2023 IEEE.

关键词： Metamaterials

来源：评论

学校读者我要写书评

暂无评论

Modulation Strategy for Cascaded DC/DC Converter through Integration of CLLLC and Six-Switch Buck-Boost Topology

Modulation Strategy for Cascaded DC/DC Converter through Int...

引用

2023 IEEE PELS Students and Young Professionals Symposium, SYPS 2023

作者： Qu, Erya Zhang, Yu He, Meng Chen, Yangfan State Key Laboratory of Advanced Electromagnetic China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology WuHan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic School of Electrical and Electronic Engineering WuHan China

ISBN: (纸本)9798350307832

This paper proposes a cascaded DC/DC converter which integrates the six-switch Buck-Boost circuit with CLLLC converter by sharing a bridge arm and shows advantages of bidirectional energy flow, high voltage rating, high efficiency and wide input voltage range. First, an alternative PWM strategy (APWM) for the six-switch Buck-Boost circuit is proposed to balance its flying capacitor voltage. Next, a control method for both current ripple optimization and power control (CRO-PC) is proposed which can reduce 73.5% of current ripple. Finally, a 2 kW/ 20 kHz prototype was built to demonstrate the performance of the proposed method. © 2023 IEEE.

关键词： Buck-Boost converter

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

Effect of icosahedral phase formation on the stress corrosion cracking(SCC)behaviors of the as-cast Mg-8%Li(in wt.%)based alloys

引用

Journal of Magnesium and Alloys 2024年第1期12卷 225-236页

作者： Shuo Wang Daokui Xu Dongliang Wang Zhiqiang Zhang Baojie Wang Key Lab of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang110819China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Engineering Research Center of Advanced Materials Preparing Technology Ministry of EducationNortheastern UniversityShenyang110819China School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang110159China Binzhou Institute of Technology BinzhouShandong Province256606China Shandong Key Laboratory of Advanced Aluminium Materials and Technology BinzhouShandong Province256606China

Through exploring the stress corrosion cracking(SCC)behaviors of the as-cast Mg-8%Li and Mg-8%Li-6%Zn-1.2%Y alloys in a 0.1 M NaCl solution,it revealed that the SCC susceptibility index(I_(SCC))of the Mg-8%Li alloy was 47%,whilst the I_(SCC)of the Mg-8%Li-6%Zn-1.2%Y alloy was 68%.Surface,cross-sectional and fractography observations indicated that for the Mg-8%Li alloy,theα-Mg/β-Li interfaces acted as the preferential crack initiation sites and propagation paths during the SCC *** regard to the Mg-8%Li-6%Zn-1.2%Y alloy,the crack initiation sites included the I-phase and the interfaces of I-phase/β-Li andα-Mg/β-Li,and the preferential propagation paths were the I-phase/β-Li andα-Mg/β-Li ***,the SCC of the two alloys was concerned with hydrogen embrittlement(HE)mechanism.

关键词： Magnesium-lithium alloy Stress corrosion cracking I-phase Fracture analysis

来源：评论

学校读者我要写书评

暂无评论

Design of the Reference Signal Generation Module in Standard Power Source 18th

Design of the Reference Signal Generation Module in Standard...

引用

18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Zhengjie, Lin Junchang, Huang Dong, Li Dezhi, Chen Feitong, Zeng State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China China Electric Power Research Institute Wuhan430074 China

ISBN: (纸本)9789819710676

Nowadays, the operating power system has a characteristic called High-RE-PE, which represents "high proportion of renewable energy access" and "high proportion of power electronic equipment application". The characteristic increases the content and frequency of harmonics in the power grid, which poses a challenge to the measurement accuracy of traditional electricity measurement equipment. Due to the High-RE-PE of the power system, it’s necessary to use a wideband and high-precision standard power source to calibrate electricity measurement equipment. A typical standard power source usually consists of a reference signal generation module, a power amplification module and a sampling feedback module. The reference signal generation module is designed in this paper, including the scheme of the reference signal generation module, selection of digital to analog converter (DAC), design of the filter circuit and design of the basic program. Theoretically, the designed reference signal generation module can output fundamental wave with amplitude error less than 0.2%, and the amplitude error of high-order harmonics is less than 2%. The simulation result shows that the designed filter circuit meets the requirements of the standard power source, the amplitude error of the filter’s output less than 0.2% under various temperature conditions. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Errors

来源：评论

学校读者我要写书评

暂无评论

Redundant Strategy of T-Type DC/DC MMC Based on Third Harmonic Injection for Submodule Failure

Redundant Strategy of T-Type DC/DC MMC Based on Third Harmon...

引用

2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： Tang, Pengfei Wang, Dan Zhang, Hongyu Fan, Ruoxuan Mao, Chengxiong School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9798331530174

In this paper, an endogenous AC optimization strategy for T-type topology DC/DC MMC(TDC-MMC) is proposed and applied to the protection strategy for sub-module faults. The endogenous AC model of TDC-MMC is established under the dq coordinate system. Based on this model, two endogenous AC strategies are derived under the conditions of loss minimization and voltage minimization, respectively. The optimization of endogenous AC is achieved by further introducing the third harmonic and redefining the voltage vector relationship under the minimum voltage condition. The optimal amplitude and phase of the third harmonic for each bridge arm are then determined. In a simulation of a 3 kV/1 kV DC transmission system, the working principle of the strategy is verified by applying the protection strategy to the sub-module fault cases of the HV Arm, MV Arm and LV Arm. © 2024 IEEE.

关键词： Harmonic analysis

来源：评论

学校读者我要写书评

暂无评论

A Novel High-Speed Hybrid PMSM and Homopolar Inductor Alternator Used for Double-Frequency Power Generation System 26

A Novel High-Speed Hybrid PMSM and Homopolar Inductor Altern...

引用

26th International Conference on Electrical Machines and Systems, ICEMS 2023

作者： Liu, Longjian Yu, Kexun Xie, Xianfei Kunming University of Science and Technology Faculty of Electric Power Engineering China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology China

ISBN: (纸本)9798350317589

In some special applications such as shipping and aerospace, the double-frequency generator is needed. The structure of existing double-frequency generator is complex, and the operating rotating speed of the existing double-frequency generator is not so high, which limits the power density of the double-frequency generator. This paper introduces a novel high-speed hybrid permanent magnet synchronous motor (PMSM) and homopolar inductor alternator (HIA) used for double-frequency power generation system. The novel machine combined the PMSM and HIA, and it has the advantages of both HIA and PMSM. The structure and operating principle of it are presented in this paper. The no-load air-gap magnetic field is analyzed in this paper. The coupling of flux between windings of HIA and PMSM is analyzed. And the FEM simulation is done to verify the theory of this paper;the simulation results show that the novel alternator has good performance for double-frequency power generation system. © 2023 IEEE.

关键词： Permanent magnets

来源：评论

学校读者我要写书评

暂无评论

The Effect of Nano-Cu Interconnection Materials on the Thermomechanical Properties of SiC Double-Sided Power Modules

The Effect of Nano-Cu Interconnection Materials on the Therm...

引用

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

作者： Wei, Suhang Liu, Jiaxin Lv, Weishan Chen, Cai Kang, Yong Wu, Yue He, Zhipeng State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology China School of Mechanical Science and Engineering Huazhong University of Science and Technology China State Key Laboratory of HVDC Electric Power Research Institute CSG China

ISBN: (纸本)9783800762620

The high porosity and high coefficient of thermal expansion (CTE) of nano-silver limit its application in SiC double-sided power modules, and the easy electromigration of nano-silver reduces its reliability. Stress fluctuations and residual stress during the sintering process directly affect the yield limit and fatigue strength of the power module and determine the reliability of solder interconnection. Therefore, this paper uses nano-copper slurry with lower cost and better CTE matching as the interconnect material for SiC double-sided power modules to solve these problems. Through finite element simulation, we conducted thermo-mechanical stress simulations on three SiC double-sided power modules whose interconnect layer materials are nano-copper, nano-silver, and SAC305. The results show that during the sintering process, compared with nano-silver, the stress fluctuation of the three layers of nano-copper slurry is greatly reduced, and the average residual stress is reduced by 33.58%, 14.79%, and 37.22% respectively. The thin interconnect layer thickness of 50um makes the steady-state junction temperature of the nano-copper module lower and has a heat dissipation capability comparable to that of nano-silver. During the sintering heating and cooling processes, the overall average stress of the nano-copper module was 11.76% and 4.98% lower than that of the nano-silver module respectively, proving that nano-copper has an excellent ability to alleviate stress concentration and improve the reliability of SiC double-sided power modules. © VDE VERLAG GMBH · Berlin · Offenbach.

关键词： Sintering

来源：评论

学校读者我要写书评

暂无评论

Novel Inertia Control Method with Phase-Locked Error Feedforward in PLL for DFIG-Based WTs

Novel Inertia Control Method with Phase-Locked Error Feedfor...

引用

International Conference of Electrical, Electronic and Networked Energy Systems, EENES 2024

作者： Yu, Jiawei Zhu, Yihua Zhou, Yini Hu, Bo Li, Zheyu Li, Xiaoyu State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou510663 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819620418

The large-scale access of wind power causes a significant reduction in the inertia of the power system, seriously threatening the security and stability of the system frequency. Inertia control methods based on the optimized PLLs provide a solution to the low inertia problem of doubly-fed inductance generator (DFIG)-based wind turbines (WTs), but they still suffer from poor dynamic performance and obvious phase-locked error in steady state. For this reason, a novel inertia control method for DFIG-based WTs is proposed in this paper to support the system frequency with better performance in all aspects. Firstly, an equivalent inertia model is deduced considering the dynamic of control and the reason why modifying PLL can realize inertia response of WT is analyzed. Then, the existing inertia control methods based on optimized PLL is introduced and a novel inertia control method with phase-locked error feed-forward in PLL (pefPLL) is proposed. After that, the inertia characteristics, dynamic performance, and steady state performance of pefPLL and other PLLs are compared. Finally, the superiority of the novel inertia control method with pefPLL is verified by simulations. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Wind turbines

来源：评论

学校读者我要写书评

暂无评论

A Novel Flux-Regulation Permanent Magnet Excited HIA with Adjustable Relative Position of Two Halves of Rotor 26

A Novel Flux-Regulation Permanent Magnet Excited HIA with Ad...

引用

26th International Conference on Electrical Machines and Systems, ICEMS 2023

ISBN: (纸本)9798350317589

The homopolar inductor alternator (HIA) has the advantage of high reliability, power density and energy storage density, which is successfully used in pulsed high power supply, power generator in airborne application, flywheel energy storage system, and propulsion system of ship. Though the copper conductor excited HIA has excellent flux modulation performance, its excitation loss is large. The permanent magnet (PM) excited HIA with mechanical flux modulation can address the problem of excitation loss, but it needs a complex extra flux modulator to change the flux. This paper introduces a novel flux-regulation permanent magnet excited homopolar inductor alternator (HIA) with adjustable relative position of two halves of rotor. The structure and operating principle of it are presented in this paper. The flux modulation is analyzed, and the FEM simulation is done to verify the theory of this paper. The simulation results show that the novel HIA has good flux-regulation performance. © 2023 IEEE.

关键词： Permanent magnets

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：