检索结果-内蒙古大学图书馆

4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Zhu, Jianhang Hu, Jiabing Li, Yingbiao Ma, Shicong Wang, Tiezhu Institute of Artificial Intelligence Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China Electric Power Research Institute Power System Department China Beijing China

ISBN: (纸本)9781728171494

The AC transmission network of Modular Multilevel Converters (MMC) usually adapts the overhead line, so the single-phase grounding faults of the AC side are rather general. At this time, the protection system will cut off the fault line for the first time, so there are two unbalance grid conditions (UGCs), i.e. single-phase grounding (SGUGC) and disconnection (SDUGC) during this process. However, the comparative analysis of small-signal stability under two different UGCs has never been involved. Therefore, when ignoring the transient process of faults and protection actions, and considering the inherent properties of the MMC system, two small-signal models based on the linear time-periodic (LTP) theory are built under SGUGC and SDUGC, respectively. Then, the influence of control parameters on the system stability under the two UGCs is compared in detail, and the results provide theoretical support for the control parameters optimization after protection system action. Finally, the detailed nonlinear MMC grid-connected model verifies the analysis results. © 2021 IEEE.

关键词： Signal analysis

来源：评论

学校读者我要写书评

暂无评论

Power dependence of density limit due to plasma-wall interaction in a burning plasma

arXiv

引用

arXiv 2025年

作者： Liu, Jiaxing Zhu, Ping Escande, Dominique Franck State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Department of Nuclear Engineering and Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States Aix-Marseille Université CNRS PIIM UMR 7345 Marseille France

The density limit is one of the major obstacles to achieving the desired fusion performance in tokamaks. However, the underlying physics mechanism for its recently observed power dependence in experiments has not been well understood or predicted in theory. In this work, the power dependent scalings of density limit are obtained based on the plasma-wall self-organization theory [D.F. Escande 2022 NF], which are able to match the power dependence of density limits in multiple tokamak devices. The key factors influencing the power dependence are found to be the plasma-wall sputtering and the particle confinement time. The effects of non-sputtered impurities and fusion products are further evaluated. This PWSO-density limit model is then extended to the burning plasma regime and used to predict the conditions for entering burning plasma. Copyright © 2025, The Authors. All rights reserved.

关键词： Tokamak devices

来源：评论

学校读者我要写书评

暂无评论

Fault Location Method for Distributed Power Distribution Network Based on Hybrid Strategy Genetic Algorithm

Fault Location Method for Distributed Power Distribution Net...

引用

2020 Asia Energy and Electrical engineering Symposium, AEEES 2020

作者： Yong, Zhang Shanming, Wan Jianghua, Zhou Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9781728167824

Since the access of the distributed power supply of distribution networks changes the structure of original networks and the direction of the power flow, so that the correctness of the relay protection action is reduced. In order to accurately locate the fault when fault occurs, a new positioning method based on hybrid strategy genetic algorithm is proposed. The entire distribution network is segmented according to the distribution of the multifunctional micro phasor measurement unit. Then the line transmission equation and the goodness function model are established, and the known network structure is fault-located by the improved genetic algorithm. The proposed method by using the global information to comprehensively consider the fault condition, avoids the misjudgment caused by the special situation. Considering the influence of the grounding resistance, the accuracy of fault location is greatly improved, and the resistance of the grounding resistor is solved for the first time. Theoretical analysis and a larger number of simulation results show that this method has high precision and stability. © 2020 IEEE.

关键词： Genetic algorithms

来源：评论

学校读者我要写书评

暂无评论

Disruption Precursor Onset Time Study Based on Semi-supervised Anomaly Detection

arXiv

引用

arXiv 2023年

作者： Ai, Xinkun Zheng, Wei Zhang, Ming Chen, Dalong Shen, Chengshuo Guo, Bihao Xiao, Bingjia Zhong, Yu Wang, Nengchao Yang, Zhoujun Chen, Zhipeng Chen, Zhongyong Ding, Yonghua Pan, Yuan International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Institute of Plasma Physics Chinese Academy of Sciences Hefei230031 China

The full understanding of plasma disruption in tokamaks is currently lacking, and data-driven methods are extensively used for disruption prediction. However, most existing data-driven disruption predictors employ supervised learning techniques, which require labeled training data. The manual labeling of disruption precursors is a tedious and challenging task, as some precursors are difficult to accurately identify, limiting the potential of machine learning models. To address this issue, commonly used labeling methods assume that the precursor onset occurs at a fixed time before the disruption, which may not be consistent for different types of disruptions or even the same type of disruption, due to the different speeds at which plasma instabilities escalate. This leads to mislabeled samples and suboptimal performance of the supervised learning predictor. In this paper, we present a disruption prediction method based on anomaly detection that overcomes the drawbacks of unbalanced positive and negative data samples and inaccurately labeled disruption precursor samples. We demonstrate the effectiveness and reliability of anomaly detection predictors based on different algorithms on J-TEXT and EAST to evaluate the reliability of the precursor onset time inferred by the anomaly detection predictor. The precursor onset times inferred by these predictors reveal that the labeling methods have room for improvement as the onset times of different shots are not necessarily the same. Finally, we optimize precursor labeling using the onset times inferred by the anomaly detection predictor and test the optimized labels on supervised learning disruption predictors. The results on J-TEXT and EAST show that the models trained on the optimized labels outperform those trained on fixed onset time labels. Copyright © 2023, The Authors. All rights reserved.

关键词： Anomaly detection

来源：评论

学校读者我要写书评

暂无评论

Structure design of pulse power module based on vacuum polarity effect 1

Structure design of pulse power module based on vacuum polar...

引用

1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Siyu, Wang Ling, Dai Yanling, Weng Fuchuang, Lin Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9781728196596

The voltage polarity and structural design of the pulsed power module are the key factors affecting the dielectric strength. In a vacuum environment, the voltage polarity of the pulse power module is different, and the flashover voltage is also different, and there is a significant polarity effect. After analysis, the cathode field emission and the gas desorption of the insulating material are the main reasons for the surface breakdown voltage of the negative-point positive plate electrode being lower than the surface breakdown voltage of the positive-point negative plate. To verify this conclusion, a needle-plate electrode vacuum breakdown experiment was designed. The internal electric field distribution of the pulse power module was calculated by COMSOL software. At the same time, the module vacuum breakdown experiment was designed. The simulation and experimental results show that the vacuum breakdown voltage of the pulse power supply module can be effectively improved by positively charging the electrode with smaller curvature radius and increasing the curvature radius of the inner electrode of the power supply module. © 2020 IEEE.

关键词： Plates (structural components)

来源：评论

学校读者我要写书评

暂无评论

Review on Optimal Operation Models and Intelligent Solving Algorithms of Cascade Hydropower Stations 4

Review on Optimal Operation Models and Intelligent Solving A...

引用

4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Si, Dajun Liang, Shuhao Sun, Peng Wu, Yaowu Li, Lingfang Wang, Yuan Center Yunnan Power Grid Co. Ltd. Power Grid Planning and Construction Research Kunming China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728171494

The optimal operation of cascade power stations is not only one of the main development directions for the comprehensive exploitation, utilization and management of water resources, but also an important strategic direction for the sustainable development of national energy. This article starting with the overview and composition of the cascade power station group, expounds the operation characteristics and task requirements of cascade hydropower under different time scales, and provides a comprehensive overview of the objective functions and constraints of medium and long-term scheduling, short-term scheduling, and day-ahead scheduling. Then this article analyzes and compares the current intelligent solution algorithms for optimal operation of cascade hydropower stations at home and abroad, and finally gives an outlook on the future research about the participation of cascade hydropower in the electricity market. © 2021 IEEE.

关键词： Scheduling

来源：评论

学校读者我要写书评

暂无评论

A Novel Station-Wide Area Information Interaction Intelligent System

A Novel Station-Wide Area Information Interaction Intelligen...

引用

7th IEEE International Conference on Industrial engineering and Applications, ICIEA 2020

作者： Jin, Neng Lin, Xiang-Ning Li, Zheng-Tian Rong, Zi-Rui Zhang, Pei-Fu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wu Han China

ISBN: (纸本)9781728167855

Wide area differential protection (WADP) is verified to have many advantages over local protection. However, it is rarely applied in the field due to its high requirement to the communication network bandwidth. To deal with this problem, on the basis of the service oriented architecture of the internet cloud computing model, a novel station-wide area information interaction intelligent system is proposed. Within the system, the station-area intelligent unit with signal processing ability is taken as terminal and initiates request, while the wide area protection layer is taken as cloud platform and provides fast response service for WADP. The simulation results verify that the proposed intelligent system has high adaptability to the low-quality communication networks with limited bandwidth. © 2020 IEEE.

关键词： Wide area networks

来源：评论

学校读者我要写书评

暂无评论

Vibration suppression of magnetic bearing system based on active disturbance rejection control with generalized integrator extend state observer 1

Vibration suppression of magnetic bearing system based on ac...

引用

1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Sun, Hongbo Jiang, Dong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9781728196596

Vibration is a common problem in rotating machine. Active Magnetic Bearing (AMB) produces controllable magnetic force to levitate rotor and the control algorithm contributes to reduce vibration. This paper proposes a vibration suppression strategy based on active disturbance rejection control (ADRC). ADRC applies extend state observer (ESO) to estimate generalized disturbance. However, in AMB system, disturbance is mainly caused by centrifugal force, whose frequency is rotating frequency. For sinusoidal disturbance, ESO cannot estimate it absolutely. To estimate sinusoidal disturbance in AMB system, generalized integrator ESO (GI-ESO) is applied in ADRC. The resonant frequency of GI is set as rotating frequency. Transfer function of error of GI-ESO is analyzed and notch feature at resonant frequency is displayed. The transfer function of third-order of ADRC applied GI-ESO is obtained. Stability of proposed vibration suppressing strategy is analyzed by root locus. Results of simulations show better effect for sinusoidal disturbance estimation of GI-ESO. After applying ADRC based on GI-ESO, vibration of displacement in AMB system is reduced effectively, which shows the effectiveness of proposed vibration suppressing strategy. © 2020 IEEE.

关键词： Natural frequencies

来源：评论

学校读者我要写书评

暂无评论

Torque Calculation of PMa-SynRM Using the Magnetic Equivalent Circuit 4

Torque Calculation of PMa-SynRM Using the Magnetic Equivalen...

引用

4th IEEE Student Conference on Electric Machines and Systems, SCEMS 2021

作者： Ling, Zaixun Shuai, Kang Cheng, Cheng Chen, Hao Zheng, Jingwen Wang, Jin State Grid Hubei Electric Power Research Institute State Grid Hubei Electric Power Co. Ltd. Wuhan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9781665436816

This paper proposes a torque analysis method for the design of PMa-SynRM. Firstly, an analytical model of the multilayer flux barrier structure of the rotor is established based on the magnetic equivalent circuit. To improve the calculation accuracy of the model, the effects of stator slotting and rotor magnetic bridge saturation are considered. Then, the analytical expression of the air gap flux density is derived and the output torque of the motor is calculated by the Lorentz force law, and the analysis results are verified by the finite element method. Finally, the torque performance of the motor under different flux barrier structures is compared through the analysis model. © 2021 IEEE.

关键词： Timing circuits

来源：评论

学校读者我要写书评

暂无评论

The High Efficiency Control Method of PMSMs Based on Gradient Descent Algorithm 4

The High Efficiency Control Method of PMSMs Based on Gradien...

引用

4th IEEE Student Conference on Electric Machines and Systems, SCEMS 2021

作者： Ling, Zaixun Chen, Hao Cheng, Cheng Shuai, Kang Zheng, Jingwen Wang, Jin State Grid Hubei Electric Power Research Institute State Grid Hubei Electric Power Co. Ltd. Wuhan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9781665436816

Maximum efficiency per ampere(MEPA) strategy based on loss model of motor is the commonly used high efficient control algorithm for permanent magnet synchronous motors. It takes into account the minimization of copper loss and iron loss, so the efficiency is higher than that of maximum torque per ampere(MTPA) strategy. In order to solve the problem that the process is too complicated when the MEPA strategy is used to obtain the optimal current, the gradient descent algorithm is introduced, and the simulation results show that it has a good effect. © 2021 IEEE.

关键词： Permanent magnets

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：