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1,281 results on '"Lv, Yuan"'

14. Robust fault‐tolerant design for LC‐coupling hybrid active power filter

Author

Lv Yuan, Wang Lei, Zhang Kai, Tian Wei, Yu Jiawen, and Gao Bing

Subjects
active power filters, open‐circuit fault tolerance, power conversion, power quality compensation, Electronics, TK7800-8360
Abstract

Abstract In this paper, an open‐circuit fault‐tolerant topology of LC‐coupling hybrid active power filter (LC‐HAPF) and its control strategy are proposed at the switch level, which can greatly improve the reliability of the system. The proposed structure has a contactor between the midpoint of each bridge arm and the negative bus of the dc‐link capacitor. When a single‐phase fault occurs, the proposed LC‐HAPF can be reconstructed into a three‐phase four‐switch system to compensate for the harmonic and reactive power, while the power quality compensation effect is hardly affected. When a two‐phase fault occurs, the operation of the normal bridge arm is not affected, and the two faulty bridge arms can suppress harmonic current and compensate for a fixed reactive power through the passive filters. When the bridge arms all fail, the whole device acts as a passive filter to suppress the harmonic current of the load and to compensate for reactive power as well. Finally, the effectiveness of the proposed topology and its control strategy is verified by simulation and experiment results.

Published
2024
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16. A multicentre, randomised, double-blind, double-dummy, parallel-controlled, phase 3 clinical trial assessing the efficacy and safety of intravenous nemonoxacin malate vs. levofloxacin for community-acquired pneumonia in adult patients

Author

LI, Ying, Zhu, Demei, Sun, Shenghua, Chang, Xiaoyue, Cao, Zhaolong, Yang, Yanping, Fu, Xiuhua, Li, Xiangyang, Xu, Jinfu, Zhu, Yingqun, Hui, Fuxin, Xu, Xingxiang, Chen, Zhang, Peng, Liping, Ma, Zhuang, Mo, Biwen, Li, Chen, Lv, Yuan, Zhao, Li, Zhu, Guangfa, He, Yong, Liu, Hua, Chen, Jichao, Wang, Ying, Liang, Yongjie, Lu, Youjin, Qin, Zhiqiang, Yang, Hongzhong, Zhang, Min, Wu, Shiman, Tong, Zhaohui, Ye, Feng, Xiao, Zuke, Wang, Xuefen, Qiu, Chen, Kuang, Jiulong, Huang, Huaping, Wang, Kai, Ying, Kejing, Jin, Faguang, Lv, Xiaoju, Huang, Yijiang, Liu, Deling, Wang, Wei, and Zhang, Yingyuan

Published
2024
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29. Continuous Self-study: Scene Graph Generation with Self-knowledge Distillation and Spatial Augmentation

Author

Lv, Yuan, Xu, Yajing, Wang, Shusen, Ma, Yingjian, Wang, Dengke, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Wang, Lei, editor, Gall, Juergen, editor, Chin, Tat-Jun, editor, Sato, Imari, editor, and Chellappa, Rama, editor

Published
2023
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35. On-orbit geometric calibration and preliminary accuracy verification of GaoFen-14 (GF-14) optical two linear-array stereo camera

Author

Bincai Cao, Wang Jianrong, Hu Yan, Lv Yuan, Yang Xiuce, Lu Xueliang, Li Gang, Wei Yongqiang, and Liu Zhuang

Subjects
Push-broom satellite, GF-14, two linear-array stereo camera, geometric calibration, geopositioning accuracy, Oceanography, GC1-1581, Geology, QE1-996.5
Abstract

ABSTRACTThe GaoFen-14 (GF-14) satellite is China’s most recent high-resolution earth observation satellite system. It is equipped with a two linear-array stereo camera and is intend for topographic mapping at 1:10,000-scale without ground control points (GCPs). The technical parameters of payloads will change once the satellite enters orbit. As a result, strict on-orbit geometric calibration is necessary. This study performs the on-orbit geometric calibration of the GF-14 stereo camera using ground calibration data. The exterior orientation errors are corrected by a comprehensive bias matrix, internal orientation errors are described by a fifth order polynomial. The results of Yinchuan calibration field show that the planar accuracy is better than 286 m (RMS) before calibration, and improved to 2.11 m (front camera) and 1.51 m (back camera) by external orientation, and further improved to 1.46 m (front camera) and 0.99 m (back camera) after internal calibration. The front intersection accuracy reaches 0.67 m in plane (RMS) and 1.10 m in elevation (RMS), respectively. Checking by multiple global check points (CKPs), the planar and elevation RMS reaches 2.38 m (5.09 m in CE90) and 2.08 m (3.43 m in LE90), respectively.

Published
2023
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