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Power Electronics and Application Symposium (PEAS), IEEE International

作者： Liwen Hou Han Peng State Key Lab of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

High-frequency power electronic switching devices generate significant high-frequency magnetic fields in their surrounding space. High-frequency magnetic field energy harvesting devices offer higher output power density, allowing for smaller energy harvesting device volumes and portable installations, compared with grid frequency energy harvesters. Currently, research on the energy harvesting of high-frequency magnetic fields is relatively limited. The establishment of an accurate equivalent circuit model for high-frequency magnetic energy harvesters remains incomplete. Existing transformer models and inductance models are not entirely applicable. Calculating the AC coil resistance caused by skin effect and proximity effect, as well as the additional losses generated by eddy currents within the magnetic core, parasitic capacitance, and AC inductance parameters are highly related with the actual structure and design of the harvester. This paper designs a rectangular magnetic core structure and analyzes the equivalent circuit for high-frequency energy harvesting. Experimental parameter extraction is conducted to validate the correctness of the equivalent circuit model, demonstrating its effectiveness and accuracy.

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Design and Experimental Verification of DC-DC Autotransformer Prototype

Design and Experimental Verification of DC-DC Autotransforme...

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IEEE Power and Energy Society General Meeting

作者： Mengbo Li Meng Zhou Wenping Zuo Weixing Lin Jinyu Wen Cheng Luo State Key Lab of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Northern Indiana Public Service Company

ISBN: (纸本)9781538622131;9781538622124

It is a necessity to use DC-DC transformers when interconnecting two DC systems with different voltages levels. This article designs the prototype of bidirectional DC-DC autotransformer (DC AUTO) and voltage step-up unidirectional DC AUTO (UUDAT). The article firstly illustrates the electrical primary system in experimental prototype, then studies its control strategy and the corresponding control system framework. Finally, the article analyses the operating characteristics of the prototype. The experimental results manifest that the bidirectional DC-AUTO transformer and the UUDAT are all capable of transmitting DC power as required. Taking interconnecting two DC systems with voltage level of 375V and 750V as instance, the capacity of the converter using DC AUTO technology will only be 50% of the capacity using conventional DC/AC/DC technology. The theoretical deductions and the experimental results have all demonstrated that DC AUTO technology will not only ensure low building cost but also lead to low transmission loss.

关键词： Power conversion Prototypes HVDC transmission Voltage control Topology electromagnetics

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Ablation characteristics of hybrid target materials for laser triggered vacuum switches

Ablation characteristics of hybrid target materials for lase...

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International Conference on Mechanical, Electric and Industrial engineering, MEIE 2018

作者： Hui, Chen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei430074 China Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy Hubei University of Technology Wuhan430068 China Hubei Key Lab. for High-efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Hubei University of Technology Wuhan430068 China

The key difference of laser triggered vacuum switch (LTVS) and electrical triggered vacuum switch (ETVS) is the different triggered way, because the initial plasmas were generated by laser irradiation target material of LTVS, which generates different impact on the triggered characteristics of LTVS with different target materials. There are three laser wavelength (1064nm, 532nm and 266nm) which are tested the triggered characteristics of target materials, with decreased conduction time delay under the condition of increasing laser energy. © Published under licence by IOP Publishing Ltd.

关键词： Hybrid materials

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Time on the performance of ceramic ball grinding media prepared from refractory waste

Time on the performance of ceramic ball grinding media prepa...

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作者： Zhong, L.Y. Wu, B.L. Zhang, L.M. Song, J.G. State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Key Lab. of Nonferrous Materials and New Processing Technology Guilin University of Technology Ministry of Education Guilin Guangxi 541004 China Department of Materials and Chemical Engineering Guilin University of Technology Guilin 541004 China

Aluminosilicate refractory waste was used to prepare high performance ceramic ball grinding media with 75% Al2O3. The influence of milling time on the particle size of raw materials, the sintering temperature, and performance of ceramic balls were studied. Results show that with increasing milling time the particle size of the raw materials decreased, resulting in a decrease of ceramic ball sintering temperature and an increase in wear resistance and volume density. The wear rate and volume density of balls prepared by milling the materials for 72 h were 0.01886 %/h and 3.374 g/cm 3, respectively.

关键词： Grinding (machining)

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On designing QoS for congestion control service using neural network predictive techniques

On designing QoS for congestion control service using neural...

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IEEE International Conference on Granular Computing

作者： Xiong, N. Yang, Y. He, Jing He, Yanxiang IEEE Japan School of Information Science Japan Advanced Institute of Science and Technology Japan Department of Computer Science Utah State University Logan UT 84322-4205 United States State Key Lab. of Software Engineering Computer School Wuhan University China

ISBN: (纸本)142440133X

With the ever-increasing data transmission applications recently, considerable efforts have been focused on the design of congestion control scheme for data transmission service to guarantee the quality of service (QoS). The main difficulty in designing an efficient congestion controller for data transmission service stems from the heterogeneous receivers, especially those with large propagation delays in data transfer, which also mean the feedbacks arriving at the source are somewhat outdated and can be harmful to the control actions. This usually leads to a mismatch between the network resources and the amount of admitted traffic. To attack this problem, the present paper describes a novel congestion control scheme that is based on a Back Propagation (BP) neural network technique. We consider a general computer communication model with multiple sources and one destination node. This network-assisted property is different from the existed control scheme in that the data source can predict the dynamic of buffer occupancy of the bottleneck node for which the back control packets experience very long propagation delay and probably cause irresponsiveness of a. data flow. This active scheme makes the control more responsive to the network status. Thus the rate adaptation can be in a timely manner for the sender to react to network congestion quickly. We analyze the theoretical aspects of the proposed algorithm, show how the control mechanism can be used to design a controller to support the data transmission based on feedback of explicit rates' (ER's), and verify this agreement by the simulations. Simulation results show the efficiency of our scheme in terms of quickly response and excellent predictive accuracy.

关键词： neural network applications neural networks traffic control (communication) interconnection networks transportation networks

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Effect of Al and Si additions on the synthesis of spark plasma sintered Zr2Al4C5 ceramic 9th

Effect of Al and Si additions on the synthesis of spark plas...

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9th China International Conference on High-Performance Ceramics, CICC 2015

作者： Guo, Qilong Pei, Junjun Gan, Jizhong Li, Junguo Zhang, Lianmeng Key Laboratory of New Building Materials and Building Energy Efficiency of Gansu Province School of Civil Engineering Northwest University for Nationalities Lanzhou730124 China State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

ISBN: (纸本)9783035710656

The Zr2Al4C5 ceramic was successfully fabricated by the spark plasma sintering at 1800°C for 10 min under uniaxial 20 MPa pressure in vacuum using a mixed raw materials of Zr, Al, Si and graphite powders. The X-ray diffraction analysis results showed that the unexpected Zr2Al3C5 phase rather than target compound Zr2Al4C5 formed in the sintered samples. An initial Zr: Al: C molar ratio of 2:4.2:4.8 for raw powders, and even 55 mol.% excess Al, did not lead to a phase transformation from Zr2Al3C5 to Zr2Al4C5. When 4 wt.% Si was induced in the starting powders, the major phase became Zr2Al4C5 and no obvious Zr2Al3C5 was detected in the sintered samples with an initial Zr: Al: C molar ratio of 2: 6.2: 4.8 (55 mol.% excess Al). The introduction of Si could suppress and even remove additional ZrC, and Si atoms would exclusively occupy the site of Al to make Zr2Al4C5 become a stable solid solution. The scanning electron microscopy observation showed that the as-synthesized Zr2Al4C5 grains had elongated, rod-like and/or plate-like shapes. The mechanical properties of the sintered Zr2Al4C5 ceramic were also investigated, and it showed a hardness of 11.06±0.34 GPa and a fracture toughness of 4.6 ± 0.4 MPa m1/2. © 2016 Trans Tech Publications, Switzerland.

关键词： Scanning electron microscopy

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Simultaneous transmission of high-speed point-to-point data and double broadcast services in a WDM-PON system with source-free ONUs

Simultaneous transmission of high-speed point-to-point data ...

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Optical Transmission, Switching, and Subsystems VI

作者： Chang, Qingjiang Huang, Mingfang Su, Yikai State Key Lab. of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China School of Electrical and Computer Engineering Georgia Institute of Technology GA 30332 United States

We propose that double broadcast services can be overlaid over high-speed point-to-point downlink data in a WDM-PON with source-free optical network units (ONUs). In the optical line terminal (OLT), a set of single-drive MachZehnder modulators (MZMs) are driven by downlink point-to-point data to generate a differential phase-shift keying (DPSK) format. The downlink DPSK signals from different wavelengths are multiplexed and then fed to a following dual-parallel MZM (DPMZM) as a double broadcast services transmitter. The broadcast service-l is an optical carrier suppression (OCS) format, while the broadcast service-2 is an inverse return-to-zero (IRZ) forma. After the transmission, at each ONU, the optical signals are separated by an optical filter. The filtered OCS signal is detected to retrieve the broadcast service-1. The DPSK/IRZ signals are split into three parts, one part is detected by an IRZ receiver to recover the broadcast service-2, the second part is detected by a DPSK receiver to retrieve the downlink data and the third part is re-modulated by the upstream amplitude shift keying (ASK). We also perform an experiment to verify the feasibility of the proposed scheme, where the power penalties of less than 1.5 dB are obtained after 25-km transmission with 1.25-Gb/s data rate. © 2008 SPIE.

关键词： Digital storage

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Optimal Model of Hydrogen Production Coupled Sewage Treatment from Renewable Energy for Hydrogen and Oxygen Utilization 10

Optimal Model of Hydrogen Production Coupled Sewage Treatmen...

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

作者： Qi, Sihang Hu, Kewei Wang, Zhan Ma, Ruodong Zhang, Yu Xiong, Binyu Wuhan University of Technology School of Automation Wuhan China Huazhong University of Science and Technology State Key Lab. of Adv. Electromagnetic Eng. and Technol. Sch. of Elec. and Electronic Engineering Wuhan China State Grid-Hubei-Electric Power Research Institute Wuhan China

ISBN: (纸本)9798350351330

To avoid the waste of oxygen, a byproduct of hydrogen production from electricity, this article proposes a new utilization scenario that combines renewable energy hydrogen production with sewage treatment, and supplies pure oxygen from hydrogen production to the aerobic aeration tank for sewage treatment. This scenario involves combining pure oxygen with air, achieving the optimal pure oxygen ratio through adjustment, and then being aerated by an aerator into an aerobic bioreactor. While achieving comprehensive utilization of hydrogen and oxygen, it greatly enhances the economy of renewable energy hydrogen production. A new application scenario for renewable energy hydrogen production is provided, and simulation results show that its daily operating cost is reduced by 67.5%. The energy consumption of the aerator is reduced by 28.5%, and the light rejection rate is reduced by 30%. © 2024 IEEE.

关键词： Oxygen

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Optimizing the balance of holes and electrons in inverted quantum dot light-emitting diodes by inserting electron transportation barrier layer

Optimizing the balance of holes and electrons in inverted qu...

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2015 SID International Symposium

作者： Jiang, Yibin Tang, Haoning Chen, Shuming Kwok, Hoi-Sing State Key Lab. on Advanced Displays and Optoelectronics Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Department of Electrical and Electronic Engineering South University of Science and Technology of China Shenzhen518055 China

In this study, the hole-electron balance of quantum dot light-emitting diodes (QDLED) was tuned in order to achieve efficiency enhancement This hole-electron balance optimization was realized by inserting thin barrier layer in the electron transportation layer. Although the current density was slightly sacrificed because of the electron blocking of the barrier layer, the charge balance was improved hence leading to 123% efficiency enhancement. © 2015 SID.

关键词： Semiconductor quantum dots

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Computational Study on the Steady-state Impedance of Saturated-core Superconducting Fault Current Limiter

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Physics Procedia 2016年 81卷 195-198页

作者： C. Zhang Y. Tang S. Liang L. Ren Z. Wang Y. Xu State Key Lab. of Advanced Electromagnetic Engineering and Technology (R&D Center of Applied Superconductivity Huazhong University of Science and Technology) 1037 Luoyu Road Wuhan 430074 P. R. China

This paper presents the electromagnetic analysis of a high voltage saturated-core superconducting fault current limiter (SCSFCL). The numerical analyses of a three-dimensional (3D) model is shown, and the specific parameters are given. The model focus on the steady-state impedance of the limiter when connected to the power grid. It analyzed the dependence of steady-state impedance on the AC coil current, and the relationship between oil gap and coil inductance. The results suggest that, adding oil gap between slice of silicon steel can reduce the core cross-section, restrain the ultraharmonic and decrease the steady-state impedance. As the core cross-section of AC limb decreased from 4344 cm 2 to 3983 cm 2 , the total harmonic distortion for voltage decreased from 2.4% to 1.8%, and the impedance decreased from 1.082 Ω to 1.069 Ω(I dc =400A,I ac =1296A).

关键词： Steady-state impedance Saturated-core superconducting fault current limiter Oil gap

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