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4th International Conference on New Energy and Power engineering, ICNEPE 2024

作者： Zhang, Yaodong Ren, Xiang Huang, Zeqi Xu, Haotian Liu, Ruiqi Lin, Fuchang Electric Power Research Institute State Grid Hubei Electric Power Co. Ltd. Hubei Wuhan430077 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Province Wuhan430074 China Huazhong University of Science and Technology Ministry of Education Key Laboratory of Pulsed Power Technology China

ISBN: (纸本)9798331516086

With the development of the power grid, the application of overhead line-cable hybrid transmission lines has become increasingly widespread. However, there has been limited research on fault localization methods for such lines. In this paper, we propose a method for differentiating quickly whether a fault occurs in the overhead line or the cable line segment when a single-phase short-circuit fault occurs in hybrid lines. This method combines the amplitude and phase of the sheath currents. It also locates the fault within the range of the cross-bonded cable subsection. © 2024 IEEE.

关键词： Overhead lines

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Mechanism of Seebeck coefficient variation at the output of NiCr/NiSi thin film thermocouple with different wires 3

Mechanism of Seebeck coefficient variation at the output of ...

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2023 3rd International Conference on Measurement Control and Instrumentation, MCAI 2023

作者： Liu, Zhihui Guo, Tengda Cheng, Yongjun Wang, Bi Shen, Kai Hu, Kai Zhou, Jiankang Zhang, Chuanbing Wang, Zixi Ding, Wanyu State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing100084 China College of Materials Science and Engineering Dalian Jiaotong University Dalian116028 China Laboratory of Low Frequency Electromagnetic Communication Technology Wmcrt Cssc China State Key Laboratory of High-end Compressor and System Technology Hefei Anhui230031 China

In this paper, by using magnetron sputtering to prepare NiCr/NiSi thin film thermocouples, the static calibration method is used for NiCr/NiSi thermocouples with rapid temperature calibration experiments. Different temperature calibration curves are obtained. The Seebeck coefficient of NiCr/NiSi thin film thermocouples connected to NiCr/NiSi wires is significantly higher (41.39 μV/°C) than that of NiCr/NiSi wires (0 μV/°C). The Seebeck coefficient (41.39 μV/°C) of the NiCr/NiSi thin-film thermocouple connected to copper wire is significantly higher than that of the thermocouple connected to copper wire (0 μV/°C). The problem of the Seebeck coefficient of the K-type thermocouple is analyzed by experimental data, which provides the relevant parameter basis for the use of the K-type thermocouple. The method has the advantages of simple equipment, convenient operation, accurate and reliable data, and provides a basis for the sensor to measure the temperature measurement. © Published under licence by IOP Publishing Ltd.

关键词： Temperature measurement

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Observation of the Space Leader during the Attachment Process in Positive laboratory Sparks 12

Observation of the Space Leader during the Attachment Proces...

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12th Asia-Pacific International Conference on Lightning, APL 2023

作者： Wang, Xiankang Liu, Xiaopeng Li, Zijian Yao, Yao He, Junjia Electric Power Research Institute State Grid Hubei Electric Power Co. Ltd. Wuhan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781665456852

A long-standing but fundamental question in lightning and laboratory spark researches is how the positive and negative leader attach with each other. Here we report optical images and discharge current waveforms during the breakthrough phase of attachment process in positive laboratory sparks. The space leader inside the common streamer zone was observed for the first time. The recorded electric current as well as the calculated impedance of the common streamer zone reveal the evolution process of the space leader. Finally, a new scenario including three subsequent stages is proposed for leaders' attachment process. © 2023 IEEE.

关键词： Laboratories

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Influence of electromagnetic Launch Rail Structure on Current Distribution 16th

Influence of Electromagnetic Launch Rail Structure on Curren...

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16th Annual Conference of China Electrotechnical Society, ACCES 2021

作者： Ge, Yifan Qin, Shihong Chen, Lixue Wuhan Institute of Technology Wuhan430200 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)9789811918698

In order to explore the influence law of rail Structural parameters on current distribution, a two-dimensional dynamic finite element model of railgun is established, and the electromagnetic thermal tight coupling rail current and temperature distribution under different rail shapes and corresponding size parameters are analyzed. The results show that reducing the spacing and height of the rectangular rail can improve the current density of inner surface of the rail, and changing the rail width has no effect on the current density distribution. Through the chamfering and the appropriate selection of the inner and outer half axis size of the elliptical rail, the current concentration phenomenon can be suppressed, rail current distribution characteristics can be improved, and the heat distribution of the rail can be optimized, which provides a reference for the size optimization design of the rail. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Electric current distribution measurement

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Enhanced Dynamic Phase Stability and Suppressed Mn Dissolution in Low-Tortuosity Spinel LMO Electrode

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Energy Material Advances 2022年第1期2022卷 24-32页

作者： Renjie He Sheng Lei Mengchuang Liu Mingsheng Qin Wei Zhong Shijie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074P.R.China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074China

Microspinel LiMn_(2)O_(4)(LMO)is a widely used cathode material in power lithium-ion ***,inevitable Mn dissolution and dynamic phase instability will cause the degradation of microspinel LMO during ***,a low-tortuosity LMO(LMO-LT)electrode is fabricated by an ice-templating method,which exhibits enhanced dynamic phase stability,alleviated Mn dissolution,and rare particle microcracks during *** is shown that the low-tortuosity electrode enables fast lithium-ion diffusion and thus small concentration polarization,leading to uniform electrochemical reaction within microregions of the LMO-LT ***,the fast lithium-ion transport kinetics and even mesoscopic scale reactions of the LMO-LT electrode effectively alleviate irreversible phase transition and Mn dissolution as well as suppress crack generation in LMO *** a result,the full cell[negative-to-positive capacity ratio(N/P)=1.1]with thick LMO-LT cathode(13 mg cm^(−2))and Li_(4)Ti_(5)O_(12) anode sustains 80.0%capacity over 200 *** LMO-LT electrode further delivers 78.9%capacity of that at 0.1 C at the high rate of 5 *** work provides an important strategy to enhance dynamic phase stability and suppress Mn dissolution at the mesoscopic scale,promoting the development of high-performance LMO electrodes.

关键词： electrode lithium kinetics

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Design of new resonant magnetic perturbation coils on the J-TEXT tokamak

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Plasma Science and technology 2023年第11期25卷 142-149页

作者：黄卓周松樊金荣李达饶波王能超丁永华毛飞越黄名响田微陈忠勇陈志鹏梁云峰 the J-TEXT Team College of Computer Science South-Central Minzu UniversityWuhan 430074People’s Republic of China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung-PlasmaphysikPartner of the Trilateral Euregio Cluster(TEC)Jülich D-52425Germany 不详

The resonant magnetic perturbation(RMP)system is a powerful auxiliary system on *** the J-TEXT tokamak,a set of new in-vessel coils is designed to enhance the amplitude of the *** new coils are designed to be two-turn saddle *** two-turn saddle coils have been optimized in terms of their structure,support,and protection components to overcome the limitations of the narrow in-vessel space,resulting in a compact coil module that can be accommodated in the *** verify the feasibility of this design,an electromagnetic simulation is performed to investigate the electrical parameters and the generated field of the coils.A multi-field coupled simulation is performed to investigate the capacity of heat *** a result of these efforts,the new RMP coils have been successfully installed on the J-TEXT *** has significantly enhanced the RMP amplitude and been widely applied in experiments.

关键词： fusion engineering tokamak resonant magnetic perturbation coil multi-field coupled simulation(Some fioures may appeari in colour only in the online iournal)

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Inherent Switching Reallocated CPS-PWM with Improved Voltage Balancing for MMC

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IEEE Transactions on Power Electronics 2025年

作者： Peng, Li Ying, Yuxuan Wang, Zhen Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China

Modular multilevel converter is an attractive solution in medium or high voltage applications, and voltage balancing is one of the most significant technical problems especially for CPS-PWM based MMCs. To solve this problem, in this paper, an inherent switching reallocated CPS-PWM is proposed for MMC. Based on arm current directions, switching states of sub-modules (SMs), voltage sorting and carrier sorting results, proposed method divides SMs and carriers into inserting and bypassing groups for each, enabling switching reallocation within these four co-optimized groups to inherently balance capacitor voltages. This effectively prevents additional switchings. Besides, most computations of the proposed CPS-PWM are logical operations implemented in FPGA, so proposed method can achieve reallocation frequency equal to sampling frequency. Unlike other CPS-PWM based methods for voltage balancing, the inherent switching reallocated CPS-PWM not only has superior converge speed in dynamic processes which accommodate a wide power range, but also has excellent balancing accuracy especially considering capacitance differences. Owing to appropriate reallocation principles, the proposed CPS-PWM has lower switching loss compared to existing carrier reallocation methods. Finally, the feasibility and superiority of the proposed method are validated by simulation and experiment results. © 1986-2012 IEEE.

关键词： Compressed sensing

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Numerical study of current density on armature and rail interface with dynamic contact

Numerical study of current density on armature and rail inte...

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Pulsed Power Conference, International Conference on High-Power Particle Beams and International Symposium on electromagnetic Launch technology (EAPPC/BEAMS/EML), Euro-Asian

作者： Jinghan Xu Shengguo Xia Lixue Chen Key Laboratory of Pulsed Power Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9789038661353

ISBN: (纸本)9798350352733

The electrical contact between the armature and rail is acknowledged as an imperfect electrical contact (ImPEC), exhibiting properties distinct from the bulk. It is necessary to understand the current distribution for future structure design and optimization. This paper proposes ImPEC boundary conditions by combining the contact layer model (CLM) and the Cooper-Mikic-Yoranovich model (CMYM), and the current distribution is numerically studied. The contact pressure and area vary with the input current, sharing similar trends, which show a rapid increase in the contact pressure and area during the current ramp-up stage, being constant in the flat stage, and a gradual decline in the current ramp-down stage. The current is re-distributed with the contact area, which is concluded as forced shifts of current caused by dynamic contact.

关键词： Rails Particle beams Contacts Dynamics Current distribution Armature Market research Numerical models electromagnetics Optimization

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High-precision Digital Phase Discriminator Based on Adaptive Sampling 5

High-precision Digital Phase Discriminator Based on Adaptive...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Lou, Hangchuan Song, Shuang Cheng, Si Liu, Hengyang Wu, Xianglong Kong, Wubin Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei China Wuhan Maritime Communication Research Institute Hubei China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

A high-precision digital phase discriminator based on adaptive sampling is proposed for an antenna automatic tuning system. FFT is used to detect the phase. The output signal of the tuning system is a periodic signal with a non-constant frequency. To reduce spectrum leakage, adaptive sampling is employed to realize phase detection of sinusoidal periodic signals in a certain frequency range. In addition, the antenna automatic tuning system outputs non-sinusoidal periodic low-power signals during tuning. By adding a frequency comparison in the adaptive sampling process, the phase detection of non-sinusoidal periodic signal in a certain frequency range is realized. The combination of odd-even frequency division and half-integer frequency division is adopted to reduce the phenomenon of spectrum leakage. A phase discrimination experiment platform is constructed to verify the effectiveness of the proposed phase discriminator. The accordance between the analysis and experimental results further testify to the advantages. © 2022 IEEE.

关键词： Antennas

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Power System Transient Stability Prediction Based on GWO-SVM and Boosting Method 17th

Power System Transient Stability Prediction Based on GWO-SVM...

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Ao, Yuqi Chen, Jinfu Cai, Defu Liu, Haiguang Chen, Rusi State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Electric Power Research Institute State Grid Hubei Electric Power Co. Ltd. Wuhan China

ISBN: (纸本)9789819903566

As various undesirable features such as intermittency, randomness and low inertia have been introduced into power system operation and control, it is imperative to develop efficient transient stability prediction (TSP) schemes. In view of the wide application of data mining technology, this paper proposes a data-driven method for TSP based on support vector machine (SVM) and ensemble learning. Firstly, grey wolf optimization (GWO) algorithm is introduced to select optimal hyperparameters of SVM. By approaching the selected position in every iteration, the constraint coefficient and balance factor are updated constantly and finally reach the fit values in search space. Moreover, an improved boosting method is applied to enhance the model performance, prediction results become more accurate and robust based on the combination of basic classifiers. Then, for the sake of filtering out the unreliable predictions, a trusted domain is set according to the distance between test sample and discriminant boundary. Finally, case studies on the IEEE 39-bus system illustrate the effectiveness of the proposed methodology. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Support vector machines

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