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1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Du, Yunfei Yin, Xianggen Lai, Jinmu Sun, Guanqun Zhao, Zhiwei Ullah, Zia Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China Chongqing Electric Power Research Institute of State Grid Chongqing Electric Power Company Chongqing400000 China

ISBN: (纸本)9781728196596

The energy internet is a multi-energy sharing system with the coordinated and optimized operation of "source-network-load-storage". The energy router (ER) is the basic equipment in the future energy internet, so the research on the routing strategy of the ER is of great significance for the energy optimization. The traditional routing strategy based on the minimum loss path (MLP) does not consider the loss cost of different distributed energy resources (DERs), so the DERs with low loss cost have the same transaction priority as the DERs with high loss cost. In addition, power exchange should not be limited to traditional centralized allocation and scheduling, but peer to peer (P2P) transactions between ERs. Therefore, a minimum loss cost path (MLCP) routing strategy that can realize P2P transactions is proposed, which can maximize the benefits and improve the priority of renewable energy by modifying marginal cost coefficient. At the same time, a scheme of congestion management based on "the principle of equal mini rate of loss"is presented, which has less loss cost and can obtain the best optimization effect under the condition of critical congestion. Effectiveness of MLCP routing strategy is proved by simulation, and the superiority of the congestion management scheme is verified by comparing with traditional schemes. © 2020 IEEE.

关键词： Energy resources

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Design and thermal analysis of vapor-cooled current leads with spiral fins for 10 kV/10 kA high-temperature superconducting cables

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Applied Thermal engineering 2025年 278卷

作者： Yingjie Tong Ying Xu Xianhao Li Dazhi Li Yunshu Zhou Wenze Si Yayu Wang Li Ren Jin Shi State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 PR China China Three Gorges Corporation Wuhan 430000 PR China

As the connection between the high-temperature superconducting (HTS) cables and the power system, the heat leakage of the current leads directly affects the total thermal load of the system. However, the existing calculation methods for vapor-cooled current leads differ greatly from real working conditions due to the assumption of “adiabatic” or “perfect heat exchange”. Therefore, this paper presents a finite element modeling method for vapor-cooled current leads, which accurately analyzes the heat exchange behavior between the current leads and the cooling gas, and then presents the design and analysis of the vapor-cooled current leads with spiral fins for 10 kV/10 kA HTS cables. First, the geometrical modeling of the finned heat exchanger with complex structure was described in detail. Subsequently, based on the “Global Equation” module in COMSOL, the finite element model of the vapor-cooled current leads was proposed and verified by existing studies. Then, the structural parameters of the current leads were designed according to its heat leakage and temperature distribution. Finally, the current range for long-term operation of the current leads and the temperature rise and recovery time under different short-circuit currents were analyzed. The simulation results indicate that the current leads can operate stably in the range of 8.5 kA-12 kA. Furthermore, the temperature rise during the short-circuit increases rapidly with the magnitude and duration of the short-circuit, while the recovery time of the temperature after the short-circuit is almost unaffected by the duration of the short-circuit.

关键词： Heat exchanger HTS cables Parametric design Thermal characteristic Vapor-cooled current leads

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Dry-processed composite cathode design with fast electron transfer network for high energy density lithium-ion battery

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Journal of colloid and interface science 2025年第Pt 1期699卷 138055页

作者： Fengqian Wang Qigao Han Shuaijing Ji Junwei Wang Baoshuai Du Keyao Li Liquan Tian Weixin Zhang Shun Tang Shijie Cheng Yuan-Cheng Cao School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan 430074 China. State Grid Shandong Electric Power Research Institute Jinan 250003 Shandong China. School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan 430074 China. State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan 430074 China. Electronic address: shuntang@***. State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan 430074 China. Electronic address: yccao@***.

The process of solvent-free binder fibrillation is a promising technology in the field of increasing electrode density and green economy. However, the electron conduction and homogeneity of thick electrodes are limited, resulting in poor battery performance and mechanical properties. Herein, we compare the effect of three different forms of conductive materials on the cathode, and design a "point-line" combined conductive carbon-binder network with polytetrafluoroethylene fiber embedded in carbon nanotubes and super P by air mill. We illustrate that the performance enhancement of the optimized cathode originates from the combined factors of excellent electronic conductivity, low surface energy and special nested structure. Furthermore, the embedded binder has the ability to protect the cathode and maintain structural stability. These characteristics result in superior cycling stability for the optimized cathode, with a capacity retention rate of 91.4 % after 150 cycles at 1C and a better rate capability (158.6 and 142.2mAhg at 1 and 2C, respectively). Consequently, it provides a valuable strategy to combine the functions of different materials to develop high energy density lithium-ion batteries.

关键词： Conductive agent Dry-process Electron transport High loading Lithium-ion battery Nested structure

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Speed Adaptative Sensorless Control Method of a High-speed Dual Three-phase Permanent Magnet Synchronous Motor

Speed Adaptative Sensorless Control Method of a High-speed D...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Heyang Yu Chun Gan Hongzhe Wang Yu Chen Kai Ni Ronghai Qu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology China

ISBN: (数字)9784886864192

ISBN: (纸本)9781728189307

This paper proposes a sensorless control method to improve the performance of a high-power, high-speed, and dual three-phase interior permanent magnet synchronous motor (PMSM). The motor has two sets of three-phase stator windings spatially phase shifted by 30 electrical degrees. First, a sliding-mode observer (SMO) is used to estimate the back EMF of the motor. Then the synchronous frequency tracking filter (SFTF) replaces the low-pass filter in the traditional sensorless control method, which can obtain the fundamental wave component in the back EMF. Finally, a phase-locked loop (PLL) is used to obtain the rotor position angle. An LC filter is also designed and adopted to reduce the current ripple due to the small inductance. In order not to generate additional losses, an active damper that also achieves the effect of suppressing resonance replaces the actual resistor.

关键词： Low-pass filters Permanent magnet motors Phase locked loops Reluctance motors Induction motors Sensorless control Rotors

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A Reactive Power Coordination Control Scheme for Hybrid Multi-Infeed HVDC System

A Reactive Power Coordination Control Scheme for Hybrid Mult...

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2020 IEEE Sustainable Power and Energy Conference, iSPEC 2020

作者： Li, Jia Xia, Yongjun Yan, Cai Yao, Wei Yao, Bing Wen, Jinyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China State Grid Hubei Electric Power Research Institute Wuhan China Hubei DC Transport and Inspection Company Yichang China

ISBN: (纸本)9781728191645

This paper proposes a reactive power coordination control scheme between voltage source converter based HVDC (VSC-HVDC) system and filter switching of line commutated converter based HVDC (LCC-HVDC) system for a hybrid multi-infeed VSC/LCC HVDC system. The conventional reactive power control strategies of filter switching of LCC-HVDC system and VSC-HVDC system are analyzed, and the limitations of them are pointed out. To reduce the filter switching, a control module is designed for the coordination control scheme. A hybrid multi-infeed system model was built in PSCAD/EMTDC for simulation verification. The simulation results showed that the performance of the reactive power coordinated control is better than that of the reactive power independent control between VSC-HVDC system and LCC-HVDC system. © 2020 IEEE.

关键词： Reactive power

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Neutral Current Characteristics and Suppression Strategies of Transformers in Urban Substations

Neutral Current Characteristics and Suppression Strategies o...

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2020 IEEE/IAS Industrial and Commercial Power System Asia, I and CPS Asia 2020

作者： Fang, Han Wang, Haijing Qiao, Yajun Luan, Le Wang, Hongbin Zhu, Jinli Chen, Jinfan Wang, Zhaoyuan Mao, Chengxiong Wang, Dan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Electric Power Security and High Efficiency Key Laboratory School of Electrical and Electronic Engineering Wuhan430074 China Electrical Power TestResearch Institute Guangzhou Power Supply Bureau Guangzhou510000 China

ISBN: (纸本)9781728143033

In urban substations near the rail transit, abnormal cases appear frequently in the grounding transformers, which can cause negative effects in the operation of the power system. This phenomenon attracts the attention of the researchers, and ultimately points to the invading stray current leaked from the rail transit nearby. Based on the measurement results in the substation, the characteristics of the neutral current in the grounding transformer are analyzed. In this way, the relationship between the change of transformer neutral current and the operation of rail transit is presented. Then the cause of harmonics in the current is modeled and analyzed. At last, a new suppression strategy for the current is proposed. For verification, the simulation proves the effectiveness of the whole research. © 2020 IEEE.

关键词： Electric grounding

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Cellulose Hydrogel-Based Biodegradable and Recyclable Magnetoelectric Composites for Electromechanical Conversion

SSRN

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SSRN 2022年

作者： Hu, Sanming Zheng, Min Wang, Qi Li, Ling Xing, Jun Chen, Kun Qi, Fuyu He, Pengyu Mao, Lin Shi, Zhijun Su, Bin Yang, Guang School of Biomedical Engineering and Imaging Xianning Medical College Hubei University of Science and Technology Xianning437100 China College of Life Science and Technology Huazhong University of Science and Technology Wuhan430074 China Huazhong University of Science and Technology China State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China College of Life Sciences Henan Agricultural University Zhengzhou450002 China

Flexible electromechanical conversion devices have attracted enormous attention as energy harvesters and self-powered sensors in the fields of wearable electronics and robotics. However, current flexible devices composed of plastic polymers and metals suffer from non-degradability and limited recyclability. Herein, a biodegradable and recyclable hydrogel-based magnetoelectric (ME) composite is fabricated via introducing NdFeB magnetic particles and copper wires into the regenerated bacterial cellulose (rBC) hydrogel. The developed hydrogel-based ME composites can effectively convert the mechanical kinetic energy into electrical energy based on the principle of electromagnetic induction, which maximum voltage reaches 15 µV. In addition, degradation experiments are conducted in this work to demonstrate the hydrogel can be rapidly degraded within 3 hours under the condition of enzyme and completely natural degraded within 49 days in water, respectively. Moreover, the left NdFeB particles and copper wires can be recyclable and reused for the same devices, leaving no environmentally hazardous electronic waste. © 2022, The Authors. All rights reserved.

关键词： Iron alloys

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Lipid droplets imaging with three-photon microscopy

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Journal of Innovative Optical Health Sciences 2023年第4期16卷 20-28页

作者： Mubin He Hojeong Park Guangle Niu Qiming Xia Hequn Zhang Ben Zhong Tang Jun Qian State Key Laboratory of Modern Optical Instrumentations Centre for Optical and Electromagnetic Research College of Optical Science and Engineering International Research Center for Advanced Photonics Zhejiang University Hangzhou 310058P.R.China Department of Chemistry The Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction The Hong Kong University of Science and Technology Clear Water BayKowloonHong Kong 999077P.R.China Shenzhen Research Institute of Shandong University Shenzhen 518057 P.R.China Department of General Surgery Sir Run Run Shaw Hospital School of MedicineZhejiang University Hangzhou 310000P.R.China School of Science and Engineering Shenzhen Institute of Aggregate Science and Technology The Chinese University of Hong Kong Shenzhen Guangdong 518172P.R.China

Lipid droplets(LDs)participate in many physiological processes,the abnormality of which will cause chronic diseases and pathologies such as diabetes and *** is crucial to monitor the distribution of LDs at high spatial resolution and large ***,we carried three-photon imaging of LDs in fat *** to the large three-photon absorption cross-section of the luminogen named NAP-CF_(3)(1:67×10^(-79) cm^(6) s^(2)),three-photon fluorescence fat liver imaging reached the largest depth of 80μ*** liver diagnosis was successfully carried out with excellent performance,providing great potential for LDs-associated pathologies research.

关键词： Lipid droplets three-photon fluorescence microscopy fat liver,deep-tissue imaging

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The Exploration of Upconversion Luminescence Nanoprobes for Tobramycin Detection Based on Förster Resonance Energy Transfer

SSRN

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SSRN 2023年

作者： Chen, Wei Wan, Tonghua Song, Wei Wen, Hongli Qiu, Xue Zhan, Qiuqiang Yu, Huijuan Yu, Lin Aleem, Abdur Raheem Key Laboratory of Clean Chemistry Technology of Guangdong Regular Higher Education Institutions GuangDong Engineering Technology Research Center of Modern Fine Chemical Engineering School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou510006 China Analysis and Test Center Guangdong University of Technology Guangzhou510006 China Smart Medical Innovation Technology Center Guangdong University of Technology Guangzhou510006 China Jieyang515200 China Centre for Optical and Electromagnetic Research South China Academy of Advanced Optoelectronics South China Normal University Guangzhou510006 China Department of Physics The University of Texas at Arlington ArlingtonTX76019-0059 United States

Tobramycin (TOB) is a broad-spectrum aminoglycoside extensively used as veterinary medicine to treat bacterial infections. However, TOB residue in food and environment may cause great threat to human health. Here, we report, for the first time, the upconversion nanoparticles (UCNPs) for TOB detection based on Förster resonance energy transfer (FRET). The upconversion (UC) luminescence from core-shell structured UCNPs was effectively quenched after addition of MnO2 nanosheets due to the effective energy transfer from the UCNPs to MnO2 nanosheets. When interacting with TOB, the UC luminescence was restored and increased as a result of coupling between TOB and aptamers, with MnO2 nanosheets dropping off the latter one. The UCNPs-MnO2 aptasensors for TOB detection have a good selectivity and sensitivity in a linear range of 10−180 ng·mL−1 with a limit of detection (LOD) of 3.04 ng·mL−1. The sensors were tested for TOB detection in real samples of liquid milk and fishes and the results are very good and satisfactory. These type of aptasensors are promising for practical applications as they have a high sensitivity, selectivity, low LOD, and are autofluorescence-free. © 2023, The Authors. All rights reserved.

关键词： Silica

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Corrigendum to “Recycling coarse aggregates from concrete using high voltage pulses” [Constr. Build. Mater. 458 (2025) 139669]

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Construction and Building Materials 2025年

作者： Luokang Dong Yingjie Fu Mengbing He Wei Huang Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology 1037 Luoyu road Hongshan district Wuhan Hubei 430074 China School of Innovation and Entrepreneurship and Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology Shenzhen 518055 China

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