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Annual Conference of Industrial Electronics Society

作者： Xinyu Jiang Fei Xu Zhen Li Zixin Li Liming Shi Yaohua Li Key Laboratory of High Density Electromagnetic Power and Systems(Chinese Academy of Sciences) Institute of Electrical Engineering Chinese Academy of Sciences University of Chinese Academy of Sciences Beijing China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu Zhongke Jinan China

ISBN: (数字)9781665464543

ISBN: (纸本)9781665464550

The disturbance of velocity sensor data may cause serious problems when the motor is running at high velocity. To tackle this issue, a velocity estimation method for high-speed linear induction motors (HS-LIM) is proposed in this paper. Firstly, the state equations of voltage, current, and velocity are established in a synchronous coordinate system to obtain the relationship between the voltage and the velocity. Secondly, the voltages of each stator section are used to synthesize the voltage characteristic waves, which are used to calculate the velocity. Finally, two velocity estimation values are fused into one more precise velocity data based on the Kalman filtering recursion algorithm. The simulation experiment verifies that the voltage characteristic waves can accurately estimate the mover velocity of HS-LIM, and the Kalman fusion velocity gets better precise.

关键词： Industrial electronics Induction motors Filtering Estimation Voltage Stators electromagnetic modeling Mathematical models Kalman filters

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An Intelligent Fault Diagnosis Method for Power Grid Based on Mask R-CNN

An Intelligent Fault Diagnosis Method for Power Grid Based o...

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Energy engineering and Power Systems (EEPS), International Conference on

作者： Yingying Wang Yong Li Mingliang Jin Xiangning Lin Lamor novation Studio of Liu Huanzhang Central China Branch of State Grid Corporation of China Wuhan China Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798350366914

ISBN: (纸本)9798350366921

To solve the problems of feature extraction, data dimensionality reduction, gradient dissipation, low training efficiency, and poor real-time performance of CNN in fault classification and diagnosis. In this paper, on the basis of revealing the mechanism of CNN network applicable to grid fault diagnosis, according to the needs of fault component identification and fault classification, firstly, a mask R-CNN-based fault diagnosis model is proposed, and secondly, the mask R-CNN-based fault diagnosis model feature vectors are designed purposefully. The example test results show that the proposed method can effectively extract deep fault features and improve the accuracy of fault diagnosis with strong stability, robustness and real-time performance.

关键词： Fault diagnosis Training Analytical models Accuracy Power system stability Feature extraction Real-time systems Power grids Data models Vectors

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Comprehensive Control Scheme for an Interlinking Converter in a Hybrid AC/DC Microgrid

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CSEE Journal of Power and Energy Systems 2021年第4期7卷 719-729页

作者： Ziwen Liu Shihong Miao Weixing Wang Dandan Sun College of Energy and Electrical Engineering Hohai UniversityNanjing 211100China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China Xuji Group Co.LTD Xuchang 461001China State Grid Nanjing Power Supply Company Nanjing 210019China

This paper presents a comprehensive control scheme for the interlinking converter(ILC)in a hybrid AC/DC microgrid consisting of the outer loop flexible power sharing control and the improved robust inner loop *** outer loop power control of ILC is presented to achieve flexible power sharing of distributed generations(DGs)in the hybrid microgrid,depending on different power management objectives,which is realized based on the deduced balance state equation,and regulating the frequency and DC voltage at the same *** improved robust inner loop control of ILC is also presented to suppress external disturbance and system model uncertainties with the improved dynamic *** improved inner loop control which includes a disturbance observer link,can force the converter current to track the reference value with no steady error and improve the dynamic stability of the microgrid・With the proposed outer loop power sharing control and improved inner loop control,the comprehensive control scheme for the ILC is presented・Simulations cases show the effectiveness and superiority of the proposed comprehensive control scheme.

关键词： Autonomous power sharing disturbance observer dynamic response hybrid AC/DC microgrid

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Hybrid AC/DC Collection and HVDC Transmission Topology for Large-scale Offshore Wind Farms

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CSEE Journal of Power and Energy Systems 2025年第3期11卷 949-959页

作者： Wang Xiang Rui Tu Mingyu Han Jinyu Wen School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan China Changzhou Power Supply Company of State Grid Jiangsu Electric Power Co. Ltd. Changzhou China

Conventional offshore wind integration systems use 33kV or 66kV AC cables to collect wind energy and employ high voltage direct current (HVDC) transmission technology to deliver wind power to onshore grids. This scheme suffers from high costs for collection systems and offshore platforms when the capacity of offshore wind farms increases. This paper proposes a hybrid AC/DC collection and HVDC transmission concept for the large-scale offshore wind integration system. Wind farms near the offshore converter platform are integrated using AC collection cables, while the remaining wind farms are integrated using DC collection cables. The AC and DC collection cables infeed to the offshore converter platform, which features a three-terminal hybrid AC/DC/DC hub. The system layout and operating principle of the hybrid AC/DC collection and HVDC transmission system are introduced in detail. The control strategy and parameter design of the hybrid AC/DC/DC hub are presented. An economic evaluation comparing conventional AC collection and HVDC transmission schemes is conducted. It is indicated that the proposed integration concept can reduce the operating power capacity and power loss of the offshore converter, enhancing the economic efficiency of the overall integration system. Finally, the effectiveness of the proposed integration technology is validated in a 2000MW offshore wind power integration system by PSCAD/EMTDC simulation analysis.

关键词： Wind farms HVDC transmission Voltage Topology Costs Wind power generation Propagation losses Wind energy integration Underwater cables Seaports

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Armature Transition and Its Effects on Bore Insulators of electromagnetic Rail Launchers 17th

Armature Transition and Its Effects on Bore Insulators of El...

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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)9789819903566

Armature transition, which erodes bore materials and degrades the sliding electrical-contact performance, has been used as a long standing problem encountered in solid-armature electromagnetic rail launchers. A small caliber launcher was applied to observe armature transition, and the effect of transition on insulation performance of bore insulators was also studied. The high temperature plasma and metal vapor, produced by transition, was ejected from the contact interface of armature-rails. Then high-temperature materials diffused from the transition position to the surrounding. Compared with the normal experiments, the mass of contaminant on insulator samples increases in case of armature transition. The metal particles attached to the surface of insulators reduce the surface resistivity, which lead to a sharp decrease in the surface flashover voltage. Especially at the 0–300 mm away from armature startup position, where the transition occurs, the surface flashover voltage of three samples was lower than 1 kV/cm. Too low holdoff strength of insulator surface may result in surface breakdown during launching. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Deterioration

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On-Line Verification Method of Backup Protection under Extreme Operation Mode Based on Convolutional Neural Network

On-Line Verification Method of Backup Protection under Extre...

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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

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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