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IEEE International Conference on Power and Power and Renewable Energy (ICPRE)

作者： Haoyu Kang Shuxin Tan Yiming Ma Yanming Gao Lin Luo Jianjun Liu Jin Wang Libing Zhou State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan China Southern Power Grid Peak Shaving Frequency Modulation Power Generation Co. Ltd. Engineering Construction Guangzhou China CSG PGC Energy Storage Research Insitute Guangzhou China Dongfang Electric Machinery Co. Ltd Dongfang Electric Corporation Deyang China

ISBN: (数字)9798350377460

ISBN: (纸本)9798350377477

The three-phase short-circuit test is a common method for measuring transient parameters of large synchronous machines. The experimental process is complex and carries certain risks. Traditional stationary test methods can enhance the safety of parameter identification experiments; however, the required rotor pre-positioning for these experiments is difficult to implement in large synchronous machines. To address these issues, this paper proposes a synchronous machine parameter identification method based on a three-phase connection of the DC decay test at arbitrary rotor positions, grounded on the principle of signal input experiments. This method equivalently transforms the DC decay test of the three-phase connection at arbitrary positions into independent rotor d- and q-axis pre-positioned DC decay tests. Using the simulated annealing particle swarm optimization algorithm to fit the current response signal, the machine's dynamic parameters are calculated. The validity and accuracy of the proposed parameter identification method were verified through experiments on a 172 MV A synchronous machine. This method requires low testing equipment, involves fewer tests, and has simple data processing, making it safe and reliable.

关键词： Parameter estimation Heuristic algorithms Welding Rotors Transforms Simulated annealing Safety Synchronous machines Transient analysis Testing

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LVRT During-fault-stage Equilibrium Point is Unnecessary for Renewable Grid-tied Systems

LVRT During-fault-stage Equilibrium Point is Unnecessary for...

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Power System and Green Energy Conference (PSGEC)

作者： Yayao Zhang Min Cheng Meng Zhan Jiawei Yu Yihua Zhu Mingkang Wu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China Yunnan Power Grid China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid China National Energy Power Grid Technology R&D Centre Electric Power Research Institute China Southern Power Grid China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Electric Power Research Institute China Southern Power Grid China

ISBN: (数字)9798350365573

ISBN: (纸本)9798350365580

Transient synchronous stability of renewable grid- tied systems is of paramount importance. Most of previous studies focused on the grid-tied converter in the low voltage ride through (LVRT) during-fault stage and performed stability analysis based on the belief that if the system has (or has no) a stable equilibrium point in the during-fault stage, the system will be stable (or unstable). Therefore, it has been broadly accepted that the existence and/or stability of equilibrium point in the during-fault stage is necessary. However, the whole LVRT contains four different stages and the during-fault stage is only one among them. The transient synchronous stability of whole system should be determined by the initial state in the late post-fault stage and the attraction basin of its equilibrium point. The late post-fault stage is essential for stability and all four stages are important. Clearly treating the during-fault stage as the whole LVRT stages makes the nonlinear switched dynamics problem be greatly simplified and, certainly, is incomplete. In order to clarify this point, this paper analyzes the influence of existence (or nonexistence) of equilibrium point in the during-fault stage on the transient synchronous stability of permanent magnet synchronous generator grid-tied system. We can find that the existence of an equilibrium point in the during-fault stage is only a sufficient condition, rather than a necessary condition. The theoretical analysis is also verified in the hardware-in-the-loop experiment Therefore, a large number of previous studies and results on the transient synchronous stability of renewable grid-tied systems are incomplete and questionable.

关键词： Sufficient conditions Stability criteria Switches Voltage Power system stability Synchronous generators Permanent magnets Nonlinear dynamical systems Transient analysis Magnetic switching

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Outside Front Cover: Plasma Process. Polym. 5/2021

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Plasma Processes and Polymers 2021年第5期18卷

作者： Yang Lv Lanlan Nie Jiangwei Duan Zhiyu Li Xinpei Lu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China Jihua laboratory Guicheng Nanhai Foshan China

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Research on Electron Evolution of Atmospheric Pressure Pulsed Dielectric Barrier Discharge Based on Two-dimensional Symmetrical Fluid Model

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Journal of Physics: Conference Series 2021年第1期2030卷

作者： Xingyu Chen Chen Lu Zilan Xiong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology WuHan Hubei 430074 People's Republic of China

In recent years, plasma technology under atmospheric pressure has been widely used, and it is urgent to study the mechanism of plasma microcosmic particles. With the development of computer technology, it may be a promising method to describe the microcosmic discharge process by simulation. In this study, a two-dimensional symmetrical fluid model of ns pulse dielectric barrier discharge (DBD) at atmospheric pressure was constructed using COMSOL software. The movement behavior of electrons in different working gas, different gap distance and different electrode radius was analyzed. It was found that in helium, the electrons would move to the outside electrode area with low electron density obviously. In argon, the electrons would always be mainly constrained within the electrode area, and the electron density is more than 105 times than that of the initial value. Changing the gap distance will change the diffusion rate and maximum density of electrons. The electron distribution will be more homogeneous, and the density within the electrode area will increase 102-103 times at large gap distance. Changing the electrode diameter has little impact on electron movement behavior. The validity of the model is verified by comparing experimental and simulated voltage and current waveforms.

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Coordinated Optimal Operation of Hybrid Energy Storage in Power System Accommodated High Penetration of Wind Power

Coordinated Optimal Operation of Hybrid Energy Storage in Po...

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International Conference on Electric Utility Deregulation and Restructuring and Power Technologies

作者： Tianmeng Yang Suhua Lou Xiangcheng Zhang Xu Tian Zuoxia Bai State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Qinghai Province Key Laboratory of Grid-connected Photovoltaic Technology Xining China Economic Institute of Technology Qinghai Province Electric Power Company Xining China

ISBN: (纸本)9781467371070

The variability and nondispatchable nature of wind power presents sustainable challenges for power system's steady operation and security. In order to accommodate high penetration of wind power and increase the utilization rate of renewable resources, a model of hybrid energy storage system consisting of battery energy storage system and pumped storage power station is proposed in this paper, and a coordinated optimal operation method in the power system is presented. Based on the restriction of upper wind power fluctuation rate limit, a determination method of grid-connected wind farm power output is presented, which can improve the scheduling performance of wind power. The power difference between the original wind farm power output and grid-connected wind farm power output is mitigated by BESS due to its quick response capacity. Pumped storage power station is used for peak regulation in power system. The proposed model and operation method are verified on a modified RTS-96 system, the results are presented to prove the feasibility and effectiveness of the proposed model and method.

关键词： hybrid energy storage determination method of grid-connected wind farm power output high penetration of wind power coordinated optimal operation

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High-performance hybrid Silicon and Lithium Niobate Mach–Zehnder modulators for 100 Gbit/s and beyond

arXiv

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arXiv 2018年

作者： He, Mingbo Xu, Mengyue Ren, Yuxuan Jian, Jian Ruan, Ziliang Xu, Yongsheng Gao, Shengqian Sun, Shihao Wen, Xueqin Zhou, Lidan Liu, Lin Guo, Changjian Chen, Hui Yu, Siyuan Liu, Liu Cai, Xinlun State Key Laboratory of Optoelectronic Materials and Technologies School of Physics and Engineering Sun Yat-sen University Guangzhou510275 China Centre for Optical and Electromagnetic Research Guangdong Provincial Key Laboratory of Optical Information Materials and Technology South China Academy of Advanced Optoelectronics South China Normal University Higher-Education Mega-Center Sci. Bldg. No. 5 Guangzhou510006 China

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Reversely tapered multicore fibers for simplified all-fiber fan-in and fan-out devices

Reversely tapered multicore fibers for simplified all-fiber ...

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Wei Ji Zihao Shen Ruowei Yu Caoyuan Wang Zhengyu Yan Liying Liu Lei Xu Kin Seng Chiang Limin Xiao Advanced Fiber Devices and Systems Group Key Laboratory of Micro and Nano Photonic Structures (MoE) Key Laboratory for Information Science of Electromagnetic Waves (MoE) Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing School of Information Science and Technology Fudan University Shanghai China City University of Hong Kong Hong Kong SAR China Yiwu Research Institute of Fudan University Yiwu China

We propose a multicore fiber reverse-tapering technique for the construction of a fused taper type fan-in and fan-out device with excellent overall performance in coupling loss, crosstalk, and return loss without usin... 详细信息

ISBN: (纸本)9781957171005

关键词： Performance evaluation Optical losses Couplings Optical fiber losses Multicore processing Crosstalk Insertion loss

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An Intelligent Sensing Platform for Detecting and Identifying Biochemical Substances Based on Terahertz Spectra

SSRN

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SSRN 2024年

作者： Chen, Yusa Xiong, Shisong Wu, Meizhang Huang, Xiwen Sun, Hongshun Cao, Yunhao Li, Liye Ma, Lijun Wu, Wengang Zhao, Guozhong Meng, Tianhua National Key Laboratory of Advanced Micro and Nano Manufacture Technology Beijing100871 China School of Integrated Circuits Peking University Beijing100871 China School of Instrument Science and Opto-Electronics Engineering Beijing Information Science and Technology University Beijing100096 China Department of Physics Capital Normal University Beijing100048 China Institute of Solid State Physics Shanxi Provincial Key Laboratory of Microstructure Electromagnetic Functional Materials Shanxi Datong University Datong037009 China

This paper presents the development of an intelligent sensing platform dedicated to accurately identifying terahertz (THz) spectra obtained from various biochemical substances. The platform currently has two distinct identification modes, which focus on identifying five amino acids, namely phenylalanine, methionine, lysine, leucine, and threonine, and five carbohydrates, namely aspartame, fructose, glucose, lactose monohydrate, and sucrose based on their THz spectra. The first mode, called One-dimensional THz Spectrum Identification (OTSI), combines THz time-domain spectroscopy (THz-TDS) with the proposed mini convolutional neural network (MCNN) model. THz-TDS detects biochemical substances, while the MCNN model identifies the THz spectra. The MCNN model has a simple structure and only needs to deal with the THz absorption coefficients of biochemical substances, which are less computationally intensive and easily converged. The model can achieve 99.07% accuracy in identifying one-dimensional THz spectra of the ten biochemical substances. The second mode, THz Spectrum Image-based Identification (TSII), applies the YOLO-v5 target detection model to THz spectral image recognition. The YOLO-v5 model uses THz absorption peaks as identification features and can identify biochemical substances based on only one or several THz absorption peaks. The accuracy of the YOLO-v5 model in identifying THz absorption spectrum images of ten biochemical substances reaches more than 89%. This feature broadens the platform's utility in biomolecular analysis and paves the way for further research and development in detecting and analyzing diverse biological compounds. © 2024, The Authors. All rights reserved.

关键词： Neural network models

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Optimal supplementary control for small signal stability of power system with DFIG integration

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Diangong Jishu Xuebao/Transactions of China Electrotechnical Society 2014年 29卷 424-431页

作者： Zhou, Zhen Sun, Jinwen Zeng, Fantao Lin, Xiangning Li, Xianshan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology Wuhan430074 China College of Electrical Engineering and New Energy Three Gorges University Yichang443002 China

According to the fact that large amount of integrated wind power can weaken the small signal stability of power system, a supplementary damping control scheme on the maximum power tracking part of DFIG is designed to increase damping of power system. To achieve best performance, parameters of the damping control is tuned by using Genetic Algorithm. Results of eigenvalue analysis and simulation on WSCC three-machine nine-bus system with DFIG integrated demonstrate that the proposed supplementary control scheme can effectively suppress the oscillation of the system. Finally, the above DFIG damping control scheme is improved to be insensitive to the change of wind speed and simulation results show that the new damping control can steadily enhance the system damping characteristics and has high practical value. ©, 2014, Diangong Jishu Xuebao/Transactions of China Electrotechnical Society. All right reserved.

关键词： Damping

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Editorial - belling the cat, revisited

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IEEE Transactions on Reliability 2002年第1期51卷 2-2页

作者： R.A. Evans Technology (Huazhong University of Science and Technology) State Key Laboratory of Advanced Electromagnetic Engineering Wuhan Hubei Province P. R. China

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