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Electrical engineering (CIYCEE), IEEE China International Youth Conference on

作者： Wenbin Cao Xuanwei Qi Song Wang Ming Chen Xianggen Yin Minghao Wen State Grid Zhejiang Electrical Power Research Institute Hangzhou China Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665400657

The circulating current in the D-winding may cause primary current waveform distortion, and the reliability of the restraint criterion based on the typical magnetizing inrush current characteristics will be affected. The magnetizing inrush current with typical characteristics is the sum of primary current and circulating current. Using the circulating current to compensate the primary current can improve the reliability of the differential protection. When the phase is not saturated, the magnetizing inrush current is about zero. Therefore, the primary current of unsaturated phase can be replaced by the opposite of the circulating current. Based on this, an engineering practical calculation method for circulating current is proposed. In the method, the segmented primary currents are used to replace the circulating current. Phasor analysis is used to demonstrate the application effect of this method when remanence coefficients are different. The method is simple and practical, and has strong applicability and high reliability. Simulation and recorded waveforms have verified the effectiveness of the method.

关键词： Electrical engineering Conferences Surge protection Distortion Transformers Reliability engineering Reliability

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PDCapsNet: A Convolution Neural Network Method for COVID-19 Detection from Chest X-Ray Images

PDCapsNet: A Convolution Neural Network Method for COVID-19 ...

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IEEE International Symposium on Information (IT) in Medicine and Education, ITME

作者： Zhihao Liang Huijuan Lu Cunqian You Wenjie Zhu Li Xie Yudong Yao Key Laboratory of Electromagnetic Wave Information Technology and Metrology College of Information Engineering China Jiliang University Hangzhou Zhejiang Province China College of Information Engineering China Jiliang University Drore Information and Technology Co. LTD Hangzhou Zhejiang Province China College of Information Engineering China Jiliang University Modern Educational Technology Center Hangzhou City Zhejiang Province China College of Biomedical Engineering and Instrumentation Science Zhejiang University Institute of Advanced Digital Technologies and Instrumentation Hangzhou Zhejiang Province China Department of Electrical and Computer Engineering Stevens Institute of Technology Hoboken New Jersey USA

The COVID-19 epidemic started in 2019 and it is still important to develop intelligent and efficient diagnostic methods for the detection of COVID-19. In the task of COVID-19 X-ray image recognition, conventional deep neural networks encounter challenges in effectively discerning distinctive features within pneumonia images, resulting in limited generalization capability when confronted with novel samples. To address this issue, we introduce a novel model in this paper, denoted as PDCapsNet. The model effectively exploits Pyconv's multi-scale fusion technique and leverages the capsule network's capacity to encapsulate diverse attributes of specific entities within COVID-19 X-ray images, resulting in enhancements in both accuracy and generalization. Experimental results show that the proposed model outperforms other previous related works.

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A New Method to Evalute Length Ratio of Positive and Negative Leaders in Breakdown Process of Composite Insulator String 7

A New Method to Evalute Length Ratio of Positive and Negativ...

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7th IEEE International Conference on High Voltage engineering and Application, ICHVE 2020

作者： Liu, Xiaopeng Zhao, Xiangen Lee, Juhyeong Liu, Gang Zhang, Yi He, Junjia State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Utah State University Department of Mechanical and Aerospace Engineering Logan United States State Key Laboratory of Hvdc Transmission Technology China Southern Power Grid Guangzhou China

ISBN: (纸本)9781728155111

It is important to evaluate the lightning performance of transmission lines, in which the flashover model of insulators plays a crucial role. The leader progression model (LPM) was widely used to simulate the insulator flashover process, and its implementation starts with the assumption that the positive and negative leaders develop with an equal length at both sides. However, some experiments [6], [9] provided evidences that this assumption may be not always true. To figure out the length ratio of the positive and negative leaders, the breakdown experiments of a 220kV composite insulator string suspended on an actual tower were carried out under the positive short tail lightning impulse (\pmb{T}_{\mathbf{f}}/\pmb{T}_{\mathbf{t}}=\mathbf{0.6}/\mathbf{8.6}\ \mu\mathbf{s}). A new method, which could overcome the shooting speed limit of the camera, was proposed to distinguish the attachment point of positive and negative leaders. Experimental results indicate that the length ratio of the positive leader to the negative leader is not equal to 1, and increases with the applied voltage. A linear regression model was used to identify the correlation between the length ratio and \mathbf{U}_{\mathbf{P}}/\mathbf{U}_{\mathbf{50}\%}, where \mathrm{U}_{\mathrm{P}} is the voltage amplitude and \mathbf{U}_{\mathbf{50}\%} is 50% breakdown voltage. © 2020 IEEE.

关键词： Flashover

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Pollution characteristics of UHVAC new composite cross-arm insulators 16

Pollution characteristics of UHVAC new composite cross-arm i...

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16th IET International Conference on AC and DC Power Transmission, ACDC 2020

作者： Nan, Jing Wan, Xiaodong Huo, Feng Hu, Wei Li, Xuelin State Key Laboratory of Power Grid Environmental Protection China Electric Power Research Institute Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781839533914

Composite cross-arms are used for constructing transmission tower structures due to their light weight, high strength, corrosion resistance, easy processing, good insulation performance and other advantages. In order to obtain insulation characteristics of UHVAC composite cross-arm insulators, the artificial pollution tests of UHVAC composite cross-arm insulator for single circuit and double circuit transmission lines were carried *** this paper,the pollution withstand voltage characteristics of UHVAC composite cross-arm insulator with different pollution degree and the pollution withstand voltage characteristics of silicone rubber surface with hydrophilicity and weak hydrophobicity were studied, and compared with the pollution flashover voltage of suspension composite insulator with the same voltage *** results show that the pollution flashover voltage and pollution degree of UHV composite cross-arm insulator have negative power exponent relationship when the surface of silicon rubber was hydrophilic;the pollution flashover voltageof composite cross-arm insulator under the condition of weak hydrophobicity is more than 15% higher than that under hydrophilic *** preliminary design structure satisfies the operating requirement according to the result of the pollution withstand voltage test for the UHV composite cross-arm insulator under the weak hydrophobic nature. © 2020 Institution of engineering and technology. All rights reserved.

关键词： Hydrophilicity

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Visible light communication for Vehicle to Everything beyond 1 Gb/s based on an LED car headlight and a 2 × 2 PIN array

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Chinese Optics Letters 2020年第11期18卷 32-37页

作者： Chaofan Wang Guoqiang Li Fangchen Hu Yiheng Zhao Junlian Jia Peng Zou Qiuyi Lu Jiang Chen Zhongya Li Nan Chi Academy for Engineering and Technology Shanghai Institute for Advanced Communication and Data ScienceKey Laboratory for Information Science of Electromagnetic Waves(MoE)Fudan UniversityShanghai 200433China

Visible light communication(VLC) shows great potential in Internet of Vehicle applications. A single-input multi-output VLC system for Vehicle to Everything is proposed and demonstrated. A commercial car headlight is used as transmitter. With a self-designed 2 × 2 positive-intrinsic-negative(PIN) array, four independent signals are received and equalized by deep-neural-network post-equalizers, respectively. Maximum-ratio combining brings high signal-to-noise ratio and data rate gain. The transmission data rate reaches 1.25 Gb/s at 1 m and exceeds 1 Gb/s at 4 m. To the best of our knowledge, it is the first-time demonstration of beyond 1 Gb/s employing a commercial car headlight.

关键词： visible light communication Internet of Vehicle Vehicle to Everything single-input multi-output deep neural networks maximum-ratio combining

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An intelligent digital secretary for design of electric power engineering 1

An intelligent digital secretary for design of electric powe...

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

作者： Lu, Yiqi Xie, Jinghai Lu, Shihua Hu, Chuye Xu, Ying Wang, Shaorong School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China State Grid Jibei Economic Research Institute Haidian District Beijing100038 China

ISBN: (纸本)9781728196596

In order to improve the digital level of design of electric power engineering and ensure the accuracy and reliability, this paper proposes an intelligent digital secretary. It clarifies the construction ideas and applications of this secretary from three aspects: the architecture, functions and intelligent business services. In intelligent business services, this paper proposes for the first time the application of feature learning based on Auto-encoder for electric power engineering design. Then, the feature parameters learned by Auto-encoder are trained through BP neural network to get the values that meet design standards. Furthermore, this paper constructs the loss function based on the optimal bias to get the results more in line with actual design requirements. Automated design algorithm based on the error model is also provided in this paper. The proposed intelligent digital secretary provides a feasible idea for realizing the leap from current manual design mode to digital design mode. © 2020 IEEE.

关键词： E-learning

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Disruption predictor based on neural network and anomaly detection on J-TEXT

Disruption predictor based on neural network and anomaly det...

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作者： Zheng, W. Wu, Q.Q. Zhang, M. Chen, Z.Y. Shang, Y.X. Fan, J.N. Pan, Y. International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

Disruption prediction is essential for the safe operation of a large scale tokamak. Existing disruption predictors based on machine learning techniques have good prediction performance, but all these methods need large training datasets including many disruptions to develop their successful prediction capability. Future machines are unlikely to provide enough disruption samples since these cause excessive machine damage and the prediction models used are difficult to extrapolate to a machines that the predictor was not trained on. In this paper, a disruption predictor based on a deep learning and anomaly detection technique has been developed. It regards the disruption as an anomaly, and can learn on non-disruptive shots only. The model is trained to extract the hidden features of various non-disruptive shots with a convolutional neural network and a long-shot term memory (LSTM) recurrent neural network. It will predict the future trend of selected diagnostics, then using the predicted future trend and the measured signal to calculate an outlier factor to determine if a disruption is coming. It was tested with J-TEXT discharges in flat top phase and can demonstrate comparable performance to current machine learning disruption prediction techniques, without requiring a disruption data set. This could be applied to future tokamaks and reduce the dependency on disruptive experiments. © 2020 IOP Publishing Ltd.

关键词： Anomaly detection

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Cover Image, Volume 7, Number 5, May 2025

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Carbon Energy 2025年第5期7卷

作者： Peng Cai Xin He Kangli Wang Zidong Zhang Qingyuan Wang Yumeng Liu Haomiao Li Min Zhou Wei Wang Kai Jiang State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan China

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Round-Robin Test of Site VSWR Validation for 18-40 GHz Band in Japan

Round-Robin Test of Site VSWR Validation for 18-40 GHz Band ...

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Asia-Pacific Symposium on electromagnetic Compatibility (APEMC)

作者： Jerdvisanop Chakarothai Katsumi Fujii Noriyuki Mitsuzuka Shinichi Okuyama Toshiki Shimazaki Hidenori Muramatsu Katsunori Miura Masaru Yoshihara Hironari Tanaka Kimihiro Tajima Takeshi Yamanaka Masashi Takabe Electromagnetic Compatibility Laboratory Electromagnetic Standard Research Center Radio Research Institute National Institute of Information and Communications Technology Tokyo Japan Matsudo Test Site Telecom Engineering Center Chiba Japan NEC Platforms Ltd. VCCI Council Tokyo Japan Japan Quality Assurance Organization Tokyo Japan EMC-Engineering Department EMC Division Riken Environmental System Co. Ltd. Saitama Japan Ohtama Calibration Service Co. Ltd. Kanagawa Japan EMC Center Environmental Business Unit Global Business Headquarters NTT Advanced Technology Corporation Tokyo Japan Intertek Japan Tokyo Japan

ISBN: (数字)9784885523472

ISBN: (纸本)9798350349498

The validation of test sites for EMI measurements in a frequency range between 18 and 40GHz is required. There has been no instruction specified in the CISPR standards for the site validation in this frequency range. However, the site VSIVR measurements might be time consuming and costly. It would be beneficial in the aspect of time and cost if the site validation can be omitted for 18 to 40GHz when the test site is already compliant with the CISPR 16-1-4 specification below 18GHz. This report shows the round-robin test results of the site VSWR for 1-6, 6-18, and 18-40 GHz bands done in six test sites in Japan. The results have shown the possibility to omit the site validation when the test site is already compliant with the CISPR $6 \mathrm{~dB}$ limit in the frequency range below 18GHz.

关键词： Uncertainty Power measurement Costs Measurement uncertainty electromagnetic interference electromagnetic compatibility Time measurement

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High-Contrast and Ultra-Narrowband Terahertz Metamaterial Absorber Based on Two-Dimensional Trenched Metal Meta-Grating

SSRN

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SSRN 2023年

作者： Wang, Wei Yan, Fengping Wang, Zhi Li, Haisu Wu, Guifang Tan, Siyu Du, Xuemei Li, Ting Wang, Xiangdong Guo, Hao Feng, Ting Institute of Optical Information Key Laboratory of Luminescence and Optical Information Ministry of Education School of Physical Science and Engineering Beijing Jiaotong University Beijing100044 China School of Electronic and Information Engineering Beijing Jiaotong University Beijing100044 China Zhengzhou Xinda Institute of Advanced Technology Zhengzhou450001 China Science and Technology on Electromagnetic Scattering Laboratory Beijing100044 China Photonics Information Innovation Center Heber Provincial Center for Optical Sensing Innovations Hebei University Baoding071002 China

Metamaterial absorbers (MAs) made of metallic materials is capable of confining incident energy on the structural surface, which offers an ideal platform for ultrasensitive detection and integrated device. However, realizing a high-contrast, ultra-narrow band resonance in metamaterials remains an intractable issue. In this work, we numerically exhibit a simple MA design based on a two-dimensional trenched metal meta-grating, which features a single ultra-narrow band resonance within a clean background spectrum ranging from 0 to 2 THz. The absorption resonance characteristics a linewidth of 0.4 GHz and Q factor of 2407, thanking to interference effect between the low-order surface plasmon polariton and Wood’s anomaly as well as further assistance from introducing the air trench. The evolutions of the absorption resonance with the key geometric parameters are numerically discussed and elucidated by the Smith curve of the reflective s-parameters. The sensing performance of the MA is also evaluated. Benefited from the exposed and widely spreading resonant electromagnetic field fully interacting with the analyte, the saturated thickness, maximum sensitivity and maximum sensitivity figure of merit for the all-metal MA sensor can be respectively as high as about 300 μm, 800 GHz/RIU and 2000, verifying the superior performance of the MA sensor. Such narrow band MAs with exposed resonant fields offer possible options for other application such as spectroscopically and nonlinear enhancing devices. © 2023, The Authors. All rights reserved.

关键词： Metamaterials

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