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Smart Power & Internet Energy Systems (SPIES), International Conference on

作者： Kangjie Ren Yi Zou Yinhong Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

In order to improve the efficiency of on-line verification of backup protection under extreme operation mode, a on-line verification method based on Convolutional Neural Networks (CNN) is proposed. This paper analyzes the potential mismatch of the backup protection value under extreme operation mode, and discusses the feasibility of CNN in the on-line verification. According to the data characteristics of CNN, a matrix containing the information of setting value and operation mode is designed as the input. The output of verification is transformed into a multi-label, so as to realize the sample space modeling. The IEEE 39-bus system verifies the effectiveness of the proposed method.

关键词： Training Energy Protective relaying Data models Internet Convolutional neural networks

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Optimized Energy Control of Mmc-Hvdc Integrated Offshore Wind Farms for Fast Frequency Support

SSRN

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SSRN 2024年

作者： Sun, Kangyi Zhou, Hongyu Yao, Wei Xiao, Bitao Wen, Jinyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronics Engineering Huazhong University of Science and Technology Wuhan430074 China Guodian Nanjing Automation Co. Ltd. Nanjing210032 China

As the amount of offshore wind energy connected to the grid increases, the grid inertia decreases and frequency security is threatened. This paper proposes an optimized energy control (OEC) scheme to improve the fast frequency support capability of the modular multilevel converter based high voltage direct current (MMC-HVDC) integrated offshore wind farm (OWF) system for onshore AC system. The OEC method is designed mainly based on active energy control (AEC) of the MMC sub-modules. A sinusoidal function-based energy utilization preset curve is designed through theoretical derivation, which can achieve optimal frequency support with limited energy utilization. Once a frequency event occurs, the MMC submodule will respond the energy-frequency according to the preset curve. The MMC carries out on-shore frequency support by releasing energy. The coordination process with the OWF is also introduced to further improve the frequency support effect. Finally, the case studies are conducted on the PSCAD/EMTDC platform based on actual engineering parameters. The frequency support performances of different control schemes under load increase and load decrease conditions are compared to illustrate the effectiveness of the proposed OEC scheme. © 2024, The Authors. All rights reserved.

关键词： Offshore wind farms

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Analysis of Robustness Enhanced LCL Filter Design Based on Stability Region

Analysis of Robustness Enhanced LCL Filter Design Based on S...

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Smart Power & Internet Energy Systems (SPIES), International Conference on

作者： Yuanzhe Ren Hua Lin Shaojie Li Xingwei Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

In LCL-type grid-connected inverter system, the resonance frequency will shift down and cross 1/6 of the sampling frequency due to the variation of grid impedance in weak grid, which will lead to instability. To enhance the robustness, an improved stability region based LCL filter design which adds a restriction on the lowest resonance frequency can be introduced. In this paper the influence of this restriction on the filter parameters have been studied and the results shows that the influence is greater under higher switching frequency. However, it is proved that the restriction will only lead to a limited total inductance increment. Therefore, the robustness enhanced filter design is proved to be of great practical value. At last, the analytical results are verified through experiments and simulations.

关键词： Employee welfare Inductance Time-frequency analysis Switching frequency Resonant frequency Power system stability Robustness

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Experimental and Simulation Study of Deposition Layer on Rails in the Startup Stage of Armatures 1

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Tian, Wen Wang, Gongwei Yuan, Weiqun Zhao, Ying Yan, Ping School of Electronic Electrical and Communications Engineering University of Chinese Academy of Sciences Beijing100049 China Institute of Electrical Engineering Chinese Academy of Sciences Beijing100190 China Key Laboratory of Power Electronics and Electric Drive Chinese Academy of Science Beijing100190 China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu Zhongke Jinan250013 China

ISBN: (数字)9789819904082

ISBN: (纸本)9789819904075

The startup of the armature has a significant influence on the whole launching process. During the launching, the rail-armature interface suffers high current density, high temperature, high contact pressure and high velocity. The condition of the rail-armature interface increases the complexity of the launching and enable the appearance of the deposition layer. The sliding electrical contact on the rail-armature interface is affected by the deposition layer. The deposition layer also changes the characteristics of contact interface, such as roughness, hardness, and thickness. In this paper, the deposition layer on rails after three launching experiments was investigated. The thickness of the deposition layer was measured by three-dimensional (3D) laser profilometer. The mass of rail blocks of the armature startup stage was measured. Moreover, the dynamic multi-physics field simulation model of startup stage was established. The temperature and current density in startup stage of the interface between the armature and rails were calculated. Three conclusions are obtained. 1) In three experiments, the deposition layer of cross section of rail blocks occurs peaks and fluctuations. The peak value of anode is larger than that of cathode, and the fluctuation of anode is more than that of cathode. 2) The mass of rail blocks increases with the number of experiments. The mass difference of the anode rail block is smaller than that of cathode. 3) The current density and temperature are concentrated at the edge and the rear of the armature. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Cathodes

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Cumulative Effects of Insulation Degradation in Solid Armature Launchers 17th

Cumulative Effects of Insulation Degradation in Solid Armatu...

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Zhao, Weikang Ye, Wenyi Xu, Rong Xu, Weidong Yan, Ping Institute of Electrical Engineering Chinese Academy of Sciences Beijing100190 China Key Laboratory of Power Electronics and Electric Drive Chinese Academy of Science Beijing100190 China School of Electronic Electrical and Communications Engineering University of Chinese Academy of Sciences Beijing100049 China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu Zhongke Jinan250013 China

ISBN: (纸本)9789819904501

As one of the key components in inner-bore, the insulators need to have sufficient insulation strength to ensure the performance and lifetime of electromagnetic launchers. Various damages appear on insulators owing to the extreme working condition of inner-bore during launching, which degrade the insulation performance and shorten the service life. Five experiments were conducted on a small caliber launcher to explore the cumulative of insulation damage. The mass differences and the surface flashover voltage of insulator samples were measured. And the mechanism of damage accumulation for three zones were analyzed in terms of the driving current, muzzle voltage and armature velocity. The main damage of Zone A and Zone B, 0–300 mm and 300–600 mm, is metal contamination. Metal deposits gradually increases and the flashover voltage nearly decreases linearly as the shots progressed. Under the action of arcs and high-speed flow, the holdoff strength of samples in Zone C, 600–900 mm, decreases rapidly and then tends to be stable. The main damage forms of Zone C samples, however, is ablation, and the decomposition of insulator is greater than the deposits. The insulation degradation caused by metal contamination is cumulative, and the increase of deposition decreases flashover voltage linearly. The cumulation of ablation, however, is only reflected in the decomposition, not the surface holdoff strength. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Ablation

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Impact of the Interconnection Structure on RRAM-Based Crossbar Array in Neuromorphic Chip 13

Impact of the Interconnection Structure on RRAM-Based Crossb...

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13th Asia-Pacific International Symposium on electromagnetic Compatibility and Technical Exhibition, APEMC 2022

作者： Fang, Lidan Li, Yan Xu, Shaojie Jin, Ning Yu, Heyuan Sun, Zhe Lei, Xiaoyong Huo, Shuyun Li, Erping Li, Bingheng China Jiliang University Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province Zhejiang China Hebei University of Technology College of Electronics & Information Engineering Tianjin China Key Laboratory of Advanced Micro-Nano Electronic Devices & Smart Systems and Applications Zhejiang China

ISBN: (数字)9781665416719

ISBN: (纸本)9781665416719

In this paper, the Izhikevich neuron model is used to simulate the spike signal, and a complete unit-cell equivalent circuit model of the RRAM-based crossbar array including parasitic effects is proposed. By changing the interconnection width, array size, and the RRAM resistance value, influences of the interconnection structure on the transmission characteristics of spike signals in the RRAM-based crossbar array for neuromorphic chips are analyzed. The simulation results show that the IR drop and crosstalk caused by the parasitic RLC components may be the main noise source that changes the operating voltage. Therefore, when the demand is met, the accuracy can be improved by changing the above-mentioned factors. © 2022 IEEE.

关键词： RRAM

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Topology and Control of a Multi-port Converter Based on Component Reuse 2

Topology and Control of a Multi-port Converter Based on Comp...

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

作者： Xu, Tianqi Chen, Yu Zheng, Gengzhe Kang, Yong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei430074 China Huazhong University of Science and Technology School of Electrical and Electronic Engineering Hubei430074 China

ISBN: (纸本)9781665400640

Household distribution systems with renewable energy often use multiple AC / DC converters, which have complex structure, large volume and high cost. This paper presents a multi-port converter based on component reuse theory and its control system. The converter contains a variety of functional ports, including a bidirectional port (grid port), an input port (photovoltaic cell module port) and an output port (DC load port), as well as an active power decoupling port for reducing DC bus voltage fluctuation. This paper also designs a modulation method to realize components reusing and reduce the switch numbers. With the proposed modulation method, the converter can operate in three modes: single input single output, single input double output and double input single output. The simulation model and experimental prototype are established to verify the feasibility of the topology and its control system. The converter has the characteristics of less switches, low hardware cost and simple control. It has a good application prospect in house-hold DC microgrid system. © 2021 IEEE.

关键词： Topology

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A Novel Miniaturized Dual-band Frequency Selective Surface 13

A Novel Miniaturized Dual-band Frequency Selective Surface

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13th Asia-Pacific International Symposium on electromagnetic Compatibility and Technical Exhibition, APEMC 2022

作者： Xu, Shaojie Li, Yan Fang, Lidan Jin, Ning Sun, Zhe Yu, Heyuan Lei, Xiaoyong Huo, Shuyun Li, Erping Li, Bingheng China Jiliang University Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province Zhejiang China Hebei University of Technology College of Electronics & Information Engineering Tianjin China Key Laboratory of Advanced Micro-Nano Electronic Devices & Smart Systems and Applications Zhejiang China

ISBN: (数字)9781665416719

ISBN: (纸本)9781665416719

This paper presents a novel frequency selective surface (FSS) structure with miniaturized, low-frequency ratio. The proposed FSS is composed by cascading a curved cross ring and a double square ring (DSL)and is centrosymmetric. It exhibits the stable performance against the variation of the incident angles from 0° to 60° for both TE and TM polarizations. © 2022 IEEE.

关键词： Frequency selective surfaces

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Optimal Dynamic Topology Evolution of Distribution Network with High Penetration of Renewable Energy 4

Optimal Dynamic Topology Evolution of Distribution Network w...

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4th International Conference on Energy, Electrical and Power engineering, CEEPE 2021

作者： Wang, Yuqi Chen, Jinfu Shi, Dongyuan Wang, Li Zhang, Shaofan Wang, Cong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Guangzhou Power Supply Bureau Guangzhou China

ISBN: (纸本)9781665433631

The goal of optimal dynamic topology evolution is to establish a distribution network which accommodates a high penetration of renewable energy with least cost. In this paper, the evolution process is formulated as a bi-level optimization model. The upper-level model optimizes the location and size of renewable distributed generation (RDG) as well as flexible resources and aims to minimize the total cost of evolution. Besides, out of simplification, the upper-level model discretizes the continues evolution process into several stages and becomes an integer programming solved by an improved genetic algorithm (GA). The lower-level model is a linear programming after the linearization of nonconvex constraints and minimizes the operation cost of the distribution system. In order to handle the uncertainty in distribution system, an hourly simulation is performed in the lower-level model which is solved by SeDuMi. Finally, the model is applied to a 13-bus distribution network to show its effectiveness. © 2021 IEEE.

关键词： Integer programming

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PLL SYNCHRONIZATION STABILITY OF MMC-GSC SYSTEM UNDER SEVERE SINGLE-PHASE-TO-GROUND FAULT 11

PLL SYNCHRONIZATION STABILITY OF MMC-GSC SYSTEM UNDER SEVERE...

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11th International Conference on Renewable Power Generation - Meeting Net Zero Carbon, RPG 2022

作者： Li, Fuqi Lin, Lei Li, Yingbiao Shi, Xiaojie Lin, Chensheng Wang, Zhenfa State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Power Electronics and Energy Management Key Laboratory Ministry of Education of China Wuhan China State Grid Tianjin Power Dong Li District Supply Company Tianjin China

ISBN: (数字)9781839537899

ISBN: (纸本)9781839537899

Compared with the grid-connected grid side converter (grid-GSC) system, the phase-locked loop (PLL) synchronization stability of MMC-connected GSC (MMC-GSC) system is more complex under severe asymmetric faults. This paper investigates the PLL synchronization stability of MMC-GSC system under severe single-phase-to-ground fault. Firstly, the circuit characteristics of the system are analyzed and the voltage at the point of common coupling (PCC) is quantified during the fault, then based on the dynamic response of PLL, the influence of MMC positive/negative sequence current and GSC positive sequence current on PLL synchronization stability are revealed analytically during severe single-phase-to ground fault. Time-domain simulations are performed in Matlab/Simulink, and the obtained results validate the theoretical findings. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Phase locked loops

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