期刊：
Journal of Physics: Conference Series,2023年2564(1):012020 ISSN：1742-6588
作者机构：
[Cui, Guiping; Jia, Lei; Qu, Xing] School of Electrical Engineering, University of South China, Hunan, Hengyang, China
摘要：
<jats:title>Abstract</jats:title>
<jats:p>The electrified railway has power quality problems such as three phases seriously unbalanced, large harmonics, and reactive power. In addition, the neutral section exists at each power supply section, which restricts the development of the high-speed and heavy-haul railway. This paper proposes a novel co-phase traction power supply system (TPSS) based on a YNvd balanced transformer, which can not only solve the above problems but also save one single-phase coupling step-down transformer, thus reducing the cost and space of the whole system. In addition, the voltage level of the converter switching device can be reduced by the rational design of the transformer tap position, which enhances the reliability and feasibility of the system. The compensation principle and control strategy of the co-phase TPSS based on the novel YNvd balanced transformer are analyzed in detail in this paper, and the compensation current detection and integrated power flow controller (IPFC) control methods are given. Simulation and analysis show that the proposed topology structure and control method are correct and feasible.</jats:p>
通讯机构：
[Yang Li; Hao Kan] S;[Junli Yin] H;Hunan Province Key Laboratory for Ultra-Fast Micro/Nano Technology and Advanced Laser Manufacture, School of Electrical Engineering, University of South China, Hengyang 421001, China<&wdkj&>School of Information Science and Engineering, University of Jinan, Jinan 250022, China<&wdkj&>School of Information Science and Engineering, University of Jinan, Jinan 250022, China<&wdkj&>School of Microelectronics, Shandong University, Jinan 250101, China
作者机构：
[Liu, Luxuan; Tang, Dongbao; Jia, Zhaoyuan; Tan, Yuyu] Univ South China, Sch Elect Engn, Ultrafast Micronano Technol & Adv Laser Mfg Key La, Hengyang 421001, Peoples R China.;[Duan, Ziwei] Sun Yat Sen Univ, Sch Biomed Engn, Shenzhen Campus, Shenzhen 518107, Peoples R China.;[Lang, Lijun] Chinese Univ Hong Kong, Dept Comp Sci & Engn, Ho Sin Hang Engn Bldg, Hong Kong 999077, Peoples R China.
通讯机构：
[Wenjing Yue; Yang Li] S;School of Information Science and Engineering, University of Jinan, Jinan, 250022, China<&wdkj&>Shandong Provincial Key Laboratory of Network Based Intelligent Computing, University of Jinan, Jinan, 250022, China<&wdkj&>School of Information Science and Engineering, University of Jinan, Jinan, 250022, China<&wdkj&>Shandong Provincial Key Laboratory of Network Based Intelligent Computing, University of Jinan, Jinan, 250022, China<&wdkj&>School of Microelectronics, Shandong University, Jinan, 250100, China
关键词：
Health monitoring;Multifunctional flexible sensor;Nanofiber;Pressure sensing;Temperature sensing
摘要：
Flexible multifunctional sensor with excellent performance via unsophisticated fabrication method is impera-tively anticipated for the development of smart human health monitoring systems and wearable electronic de-vices. Here, we report a multilayer dual-mode flexible sensor (DMFS) by integrating different sensing layers on the two sides of a flexible dielectric substrate for sensing pressure and temperature. The introduction of elastic nanofiber skeleton structure and internal "sea urchin" like conductive materials is the top priority for the DMFS to have excellent sensing performance and durability. As a result, the fabricated DMFS ultimately shows excellent pressure sensitivity of 111.96 kPa-1 within a wide sensing range up to 70 kPa. In the case of temperature stimulus, the DMFS accomplishes a high, linear response to the ambient temperature variation within the range from 20 degrees C to 50 degrees C, while maintaining high stability and durability after long-term bending cycles. In addition, DMFS reveals its great potential for non-contact dynamic temperature measurement by being integrated into an intelligent temperature monitoring system. Most importantly, a novel smart human health-monitoring system, which attributes to the coordination and common work of multiple DMFS, has been developed and realizes simultaneous detection of multiple physiological signals of human beings in real-time.
期刊：
Journal of Physics: Conference Series,2023年2479(1):012058 ISSN：1742-6588
通讯作者：
Sheng, Yifa(syf871@163.com)
作者机构：
[Yang, Xuanyuan; Sheng, Yifa] School of Electrical Engineering, University of South China, HUNAN, Hengyang;421001, China;[Yang, Xuanyuan; Sheng, Yifa] 421001, China
摘要：
<jats:title>Abstract</jats:title>
<jats:p>Modular multilevel converters (MMCs) are extensively used in flexible high-voltage DC transmission systems. As an important part of them, it plays an important role in the normal use of MMCs. The main additional loss in the system is generated by the second harmonic in the circulating current. By summarizing and comparing current circulation control strategies. Based on the current research status of circulation suppression, we prospect the research direction of the MMC circulating current suppression.</jats:p>
期刊：
Journal of Physics: Conference Series,2023年2535(1):012002 ISSN：1742-6588
通讯作者：
Hu, Jiwen(hu_sanping@163.com)
作者机构：
[Liu, Can; Liu, Yong] School of Electrical Engineering, University of South China, Hengyang;421001, China;[Hu, Jiwen; Xie, Yaqian; Lei, Weirui] School of Mathematics and Physics, University of South China, Hengyang;[Liu, Can; Hu, Jiwen; Xie, Yaqian; Liu, Yong; Lei, Weirui] 421001, China
摘要：
<jats:title>Abstract</jats:title>
<jats:p>Prediction of cavitation damage to the solid boundary is crucial in the application of ultrasound. The goal of this study is to investigate the potential for a cavitation bubble to cause mechanical effects on the curved elastic boundary and contribute to the understanding of the mechanisms of bubble-structure interaction. Effects of the surface curvature of the boundary are studied using the finite volume method. In the oscillatory migration of bubbles to the bottom of the boundary, there are several shape modes at the same time. The wall stress/deformation produced by impinging jets increases with parameter α. The bubble dynamic behaviors and the wall deformation have no significant effect as Young’s modulus equals or exceeds 60 MPa. Boundary deformation generated by tensile and compressive stresses during bubble collapse may be the basic mechanism of cavitation erosion. Due to the lack of visual observation and research on the acoustic cavitation effect, the key mechanism of ultrasonic cavitation is missing. Therefore, the importance of bubble dynamics and cavitation damage in this paper is self-evident</jats:p>
作者机构：
[Huang, Jiahui; Liu, Jie; Yang, Xiaohua; Ma, Jiayu] School of Computer Science, University of South China, Hunan, Hengyang, China;[Liu, Hua] School of Electrical Engineering, University of South China, Hunan, Hengyang, China
通讯机构：
[Liu, J.; Yang, X.] S;School of Computer Science, Hunan, China
关键词：
compensation response;fault diagnosis;information flow;inverse response;SDG model
期刊：
Proceedings of SPIE - The International Society for Optical Engineering,2023年12462:11 ISSN：0277-786X
作者机构：
[Qiang, Ma Yao; Yu, Gong Xue] School of Electrical Engineering, University of South China, Hunan, Hengyang;421001, China;[Qiang, Ma Yao; Yu, Gong Xue] 421001, China
作者机构：
[Bin, Bin; Wan, Shunkuan; Fu, Jia; Wang, Fudi; He, Liang; Zhang, Hongming; Lyu, Bo; Li, Yichao; Bae, Cheonho] Chinese Acad Sci, Inst Plasma Phys, HFIPS, Hefei 230031, Peoples R China.;[Bin, Bin; Wan, Shunkuan; He, Liang; Lyu, Bo; Li, Yichao] Univ Sci & Technol China, Hefei 230026, Peoples R China.;[Shen, Yongcai] Hefei Normal Univ, Sch Phys & Mat Engn, Hefei 230601, Peoples R China.;[Shen, Yongcai] Comprehens Natl Sci Ctr, Inst Energy, Hefei 230026, Peoples R China.;[Yin, Xianghui; Ji, Huajian] Univ South China, Sch Elect Engn, Hengyang 420001, Peoples R China.
通讯机构：
[Hongming ZHANG; Bo LYU] I;Institute of Plasma Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, People's Republic of China<&wdkj&>University of Science and Technology of China, Hefei 230026, People's Republic of China<&wdkj&>Institute of Plasma Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
摘要：
The measurement of impurity distribution in the divertor region of tokamaks is key to studying edge impurity transport. Therefore, a space-resolved vacuum-ultraviolet (VUV) spectrometer is designed to measure impurity emission in the divertor region on EAST. For good spectral resolution, an eagle-type VUV spectrometer with 1 m long focal length with spherical holograph grating is used in the system. For light collection, a collimating mirror is installed between the EAST plasma and the VUV spectrometer to extend the observing range to cover the upper divertor region. Two types of detectors, i.e. a back-illuminated charge-coupled device detector and a photomultiplier-tube detector, are adopted for the spectral measurement and high-frequency intensity measurement for feedback control, respectively. The angle between the entrance and exit optical axis is fixed at 15°. The detector can be moved along the exit axis to maintain a good focusing position when the wavelength is scanned by rotating the grating. The profile of impurity emissions is projected through the space-resolved slit, which is set horizontally. The spectrometer is equipped with two gratings with 2400 grooves/mm and 2160 grooves/mm, respectively. The overall aberration of the system is reduced by accurate detector positioning. As a result, the total spectral broadening can be reduced to about 0.013 nm. The simulated performance of the system is found to satisfy the requirement of measurement of impurity emissions from the divertor area of the EAST tokamak.
期刊：
Magnetism and Magnetic Materials,2022年12(6):065311 ISSN：2158-3226
通讯作者：
Wang, Xinlin(wxl_ly000@aliyun.com)
作者机构：
[Jiang, Shangting; Li, Ye; Wang, Xinlin] School of Nuclear Science and Technology, University of South China, No. 28, Changsheng West Road, Hunan, Hengyang;421001, China;[Chen, Zhiyong; Zhu, Weihua; Wu, Qinmao; He, Hongyu] Hunan Province Key Laboratory for Ultra-Fast Micro/Nano Technology and Advanced Laser Manufacture, School of Electrical Engineering, University of South China, No. 28, Changsheng West Road, Hunan, Hengyang;[Jiang, Shangting; Li, Ye; Chen, Zhiyong; Zhu, Weihua; Wu, Qinmao; He, Hongyu; Wang, Xinlin] 421001, China;[Wang, Xinlin] 421001, China<&wdkj&>Hunan Province Key Laboratory for Ultra-Fast Micro/Nano Technology and Advanced Laser Manufacture, School of Electrical Engineering, University of South China, No. 28, Changsheng West Road, Hunan, Hengyang
通讯机构：
[Ye Li; Xinlin Wang] S;School of Nuclear Science and Technology, University of South China , No. 28, Changsheng West Road, Hengyang City, Hunan 421001, China
作者机构：
[Liu, Haijing; Gong, Xueyu] School of Electrical Engineering, University of South China, 28 West Chang Sheng Road, Hunan, Hengyang;421001, China;[Wang, Fudi; Fu, Jia; Jin, Yifei; He, Liang; Lu, Dian; Bae, Cheonho; Zhang, Hongming; Fu, Shengyu; Ji, Huajian; Lyu, Bo] Institute of Plasma Physics, Chinese Academy of Sciences, 350 Shu Shan Lake Road, Anhui, Hefei;230031, China;[Zhong, Yijun; Huang, Qianhong; Deng, Sheng] School of Nuclear Science and Technology, University of South China, 28 West Chang Sheng Road, Hunan, Hengyang
期刊：
Journal of Physics: Conference Series,2022年2378(1):012043 ISSN：1742-6588
作者机构：
[Shen, Bing; Sheng, Yifa] School of Electrical Engineering, University of South China, Hunan, Hengyang;421001, China;[Shen, Bing; Sheng, Yifa] 421001, China
摘要：
<jats:title>Abstract</jats:title>
<jats:p>Modular Multilevel Converter (MMC) is widely used in flexible HVDC transmission systems, IGBT module as its core power device, its failure process seriously affects the operation reliability of MMC. The high junction temperature is an important reason for the failure of the IGBT module, so monitoring the junction temperature of IGBT module is an important means to ensure the stable operation of the system. According to the topological structure of IGBT module, the current junction temperature monitoring methods of IGBT module are summarized and compared. According to the shortcomings of the current research and the current research status, the research direction of IGBT module junction temperature monitoring is prospected.</jats:p>
