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Corrections to “Direct Charge Control for Mixed Conduction Mode Grid-Connected Inverter”

IEEE Transactions on Power Electronics 2022年第3期38卷 3412-3413页

作者： Pu Zhao Yu Zhang Qingxin Guan Josep M. Guerrero State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronics Engineering Huazhong University of Science and Technology Wuhan China Institute of Energy Technology Aalborg University Aalborg Denmark

Unfortunately, due to omissions in the proof of the paper, Figs. 10(c), 16, 22, 27(a) and (b), and 30 have some mistakes that confuse the normal reading.

关键词： Inverters

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Directional pilot protection method of energy ratio of whole frequency band for VSC-HVDC grid based on improved HHT

Directional pilot protection method of energy ratio of whole...

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2022 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2022)

作者： T. Chen Z. Zhao Y. Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan People's Republic of China

A directional pilot protection method of energy ratio of whole frequency band based on improved HHT is proposed to solve the problems of flexible DC line backup protection which is easily affected by the distributed capacitance of transmission line, synchronous communication, high resistance and applicability of algorithm. Firstly, by analysing the amplitude frequency response characteristics of the line boundary under forward and reverse faults, the attenuation effect of the boundary on the energy of different frequency band is obtained; Then, the improved HHT algorithm based on EEMD is used to extract the voltage energy of each frequency band, and constructs the fault detection criterion, direction criterion and pole selection criterion; Finally, based on PSCAD/EMTDC simulation platform, the effectiveness of the protection scheme is verified.

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A Fast Line Reclosing Strategy for Power System Under DG Access

A Fast Line Reclosing Strategy for Power System Under DG Acc...

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Power engineering (ICPE), International Conference on

作者： Wulue Pan Feng Xu Zanzan Zhang Ruizhi Ma Zhengxu Qian Yutao Qiu Shuiyao Chen Yudong Fang State Grid Zhejiang Electric Power Co. Ltd. Hangzhou China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

For the automatic reclosing of power system under renewable energy source access, the current practice is usually to cut off the renewable energy source or block the reclosing gate after a fault occurs. This will lead to the shutdown of the renewable energy source and the interruption of power supply to a large number of local loads, which is not conducive to the safe operation of the grid and the efficient utilization of the renewable energy source. In this paper, a fast reclosing method is proposed for substation lines with inverter-type renewable energy source access, which can ensure the power supply of important loads and make the renewable energy source stable during the reclosing period without going off-grid. Firstly, it is pointed out that the inverter-type renewable energy source is switched to VSG-control during the reclosing period, so that it has the basic islanding operation capability. Then the method of load shedding with the startup of unloading resistor during the reclosing period is proposed to ensure the power balance between the new energy power and the loads. Next, adjusting the rated frequency of the renewable energy source to accelerate the simultaneous process, which can speed up the whole reclosing process. Finally, the simulations under different working conditions are carried out on the PSCAD/EMTDC to verify the feasibility of the proposed reclosing strategy.

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Towards advanced divertor configurations on the J-TEXT tokamak

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Plasma Science and technology 2022年第12期24卷 233-250页

作者： Yunfeng LIANG Zhipeng CHEN Nengchao WANG Zhifeng CHENG Alexander KNIEPS Song ZHOU Bo RAO Shuai XU Philipp DREWS Xiaolong ZHANG Hao WANG Zhaosu WANG Jie YANG Xin XU Jiankun HUA Qinghu YANG Wei YAN Cunkai LI Yutong YANG Shuhao LI Shaocheng LIU Lin NIE Ting LONG Liang LIAO Fuqiong WANG Yasuhiro SUZUKI the J-TEXT Team 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 52425Germany Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China Southwestern Institute of Physics Chengdu 610041People's Republic of China Department of Applied Physics College of ScienceDonghua UniversityShanghai 201620People's Republic of China Graduate School of Advanced Science and Engineering Hiroshima UniversityHigashi-Hiroshima 739-8527Japan

Developing advanced magnetic divertor configurations to address the coupling of heat and particle exhaust with impurity control is one of the major challenges currently constraining the further development of fusion *** has therefore become the focus of extensive attention in recent *** J-TEXT,several new divertor configurations,including the high-field-side single-null poloidal divertor and the island divertor,as well as their associated fundamental edge divertor plasma physics,have recently been *** purpose of this paper is to briefly summarize the latest progress and achievements in this relevant research field on J-TEXT from the past few years.

关键词： divertor tokamak magnetically confined fusion

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Design of HUST-UED femtosecond laser delivery system

Design of HUST-UED femtosecond laser delivery system

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2023 Applied Optics and Photonics China: Laser technology and Applications;and Optoelectronic Devices and Integration, AOPC 2023

作者： Zhang, Haiming Wang, Jian Liu, Zhengzheng Tsai, Cheng-Ying Li, Kehan Hu, Chen Li, Xiaofei Fan, Kuanjun State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China State Grid Hunan Electric Power co. LTD UHV Substation co. Changsha410000 China State Grid Jiangxi Electric Power co. LTD Nanchang330096 China China Electric Power Research Institute Wuhan430074 China

ISBN: (纸本)9781510672246

Ultrafast electron diffraction using photocathode microwave electron guns is a powerful tool for investigating ultrafast science. To improve the spatial and temporal resolution of diffraction, it is crucial to enhance the quality of the electron beam, particularly the initial quality of the electron beam emitted from the photocathode that is influenced by the driving laser. To meet the strict requirements, the performance parameters of the femtosecond laser transmission system play a significant role. In this paper, we analyze the impact of femtosecond laser system parameters on diffraction resolution and investigate the primary indicators of the femtosecond laser system. We conducted experiments to measure the primary parameters of the laser, including pointing stability, beam diameter, pulse width, and pulse energy. Based on the experimental results and considering the complexity of engineering implementation, we proposed an optical scheme for the femtosecond laser transmission path to satisfy the requirements of the ultrafast electron diffraction device for further improving the diffraction resolution. This research aims to provide valuable insights into optimizing the femtosecond laser system for ultrafast electron diffraction experiments. © 2023 SPIE.

关键词： Femtosecond lasers

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Cesium Oven for Hust Negative Ion Source: Design and Functional Tests

SSRN

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SSRN 2022年

作者： Zuo, Chen Xue, Feng Li, Jiawang Li, Dong Chen, Dezhi State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology 1037 Luoyu Road Wuhan China

Cesium will be evaporated inside HUST negative ion source to enhance the negative ion yield, by lowering the surface work function. In order to control the Cs vapour flux precisely, a temperature controlled Cs oven is developed. This paper introduces the design of the Cs oven body and temperature control system. After the manufacturing and assembly, some preliminary tests are carried out to verify the basic functions, such as temperature control and SID diagnosis © 2022, The Authors. All rights reserved.

关键词： Cesium

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A Coordination Control Strategy Participating in Frequency Control for VSC-HVDC and LCC-HVDC 5

A Coordination Control Strategy Participating in Frequency C...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Li, Jia Xia, Yongjun Yao, Wei Han, Qingtao Wen, Jinyu Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Electric Power Research Institute of State Grid Hubei Electric Power Co. Ltd. Wuhan China Hubei Dc Transport and Inspection Company Yichang China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

This paper proposes a coordination control strategy participating in frequency control for the system interconnected by voltage source converter based high-voltage direct current (VSC-HVDC) inverter station and line commutated converter based high-voltage direct current (LCCHVDC) rectifier station. The strategy includes active power and reactive power coordination control for VSC-HVDC and LCCHVDC. The active power coordination control can improve the frequency stability of VSC-HVDC transmission network by reasonable switching additional frequency controllers. The reactive power coordination control can reduce the number of switching filters of LCC-HVDC and improve the voltage stability of power network during frequency regulation. Finally, an equivalent simplified model of practical grid is built in MATLAB/Simulink, and the effectiveness and adaptability of the additional frequency coordinated control strategy are verified by simulation. © 2022 IEEE.

关键词： MATLAB

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Design and Analysis of Segmented Dipole Coil for Scalable Wireless Power Transfer to Multiple Devices 2

Design and Analysis of Segmented Dipole Coil for Scalable Wi...

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2nd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2021

作者： He, Xiangrui Rong, Cancan Lu, Conghui Zeng, Yingqin Liu, Xiaobo Liu, Renzhe Liu, Minghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430000 China China University of Mining and Technology School of Electrical and Power Engineering Xuzhou221116 China

ISBN: (纸本)9781665400640

This paper proposed a novel dipole coil using segmented windings for wireless power transfer (WPT) system with four receivers. The most attractive feature is that the couplings between transmitter and the receivers can be enhanced under the premise of lower core saturation with segmented dipole coil (SDC). Mistuning issues caused by the utilization of ferrite core are modeled and analyzed in detail. Furthermore, an optimized SDC is proposed to homogenize the magnetic field density in ferrite core. Thus, the proposed structure shares the same core saturation with dipole coil using evenly distributed windings but possesses a 30.7% more coupling strength. Eventually, an experimental prototype compensated by LCC-S topology is established. The maximum overall efficiency of four loads reaches 48% when the distance-to-diameter ratio equals to 1. The proposal of novel SDC structure can provide a significant guideline for numerous charging scenarios, such as multiple sensors or robot swarms. © 2021 IEEE.

关键词： Winding

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A Novel Variable Impedance PM Machines with Separated Fault Tolerant Ring

A Novel Variable Impedance PM Machines with Separated Fault ...

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IEEE Energy Conversion Congress and Exposition, ECCE

作者： Runyu Wang Xinggang Fan Dawei Li Ronghai Qu Yongtao Peng Xiaopeng Zhao State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China National Key Laboratory of Science and Technology on Aircraft Control AVIC Xi’an Flight Automatic Control Research Institute Xi’an China

This paper aims to analyze and design a novel variable impedance permanent magnet (PM) machine with separated fault tolerant ring for high reliability applications. The proposed topology automatically changes from low impedance to ultra-high impedance under turn-to-turn short-circuit without complex fault diagnosis and control strategies. First, the topology of the variable impedance PM machine is introduced. Then, the magnetic field distribution of the separate fault tolerant ring under health and fault is analyzed to qualitatively reveal the fault tolerance principle. Finally, a turn-to-turn short-circuit model considering the core saturation effect is developed for investigating the mechanism of fault tolerance performance improvement. It is found that the short-circuit current and torque ripple after the fault of the variable impedance machines are significantly lower than those of the conventional ones.

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SHAP Algorithm for Transparent Power System Transient Stability Assessment: Critical Impact Factors Identification

SHAP Algorithm for Transparent Power System Transient Stabil...

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International Conference on Power System technology (POWERCON)

作者： Yutian Lan Zhongtuo Shi Wei Yao Rui Zhou Feng Luo Jinyu Wen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China State Grid Electric Power Research Institute Nari Group Corporation Nanjing China

Data-driven power system transient stability assessment (TSA) is a promising way to improve both the prediction efficiency and precision, but “black-box” property affects their reliability and hinders the extraction of knowledge from the model, such as the critical impact factors for transient stability. By developing a TSA model based on imbalance-XGBoost algorithm, it can enhance the identification of unstable samples and increase the reliability of the model. By employing SHAP algorithm, a fast calculation method of Shapley value, to the TSA model, it can achieve the best possible computation of how each feature affects the prediction result. By examining the feature contribution from both local and global aspects, it can thoroughly explore the critical impact factors and offer guidance for power system control. The experiment on the standard 39-bus test system demonstrates that SHAP algorithm can enhance the model interpretability and realize outstanding transient stability assessment by using the obtained critical impact factors.

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