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International Conference on Power Electronics and Motion Control (IPEMC)

作者： Jinajie Xiao Lin Hua Yajun Ma Hua Ting State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Siecnce and Technology Wuhan China

ISBN: (数字)9781728153018

ISBN: (纸本)9781728153025

Modular Multilevel Converter (MMC) with integrated Battery Energy Storage System (BESS) has attracted amount of interest in recent years. However, compared with the common MMC, the SM capacitor voltage fluctuation in MMC-BESS become worse because of the integration of batteries, requiring larger SM capacitor to ensure the operation. This paper analyzes the influence of the integration of battery units on capacitor voltage ripples. Then a novel configuration for integration of BESS into MMC is presented. By using an isolated three-port converter as the battery interface converter, this configuration allows the batteries to connect both upper and lower arms and alleviates the SM voltage ripples problem. After that, the corresponding control strategy is presented. The simulation and experiment results are given to validate the effectiveness of the proposed configuration and control strategy.

关键词： Multilevel converters Voltage fluctuations Fluctuations Capacitors Batteries State of charge Voltage control

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A General Coordination Scheme for Zero-sequence Current Differential Protection on Series-compensated Multi-circuit Line

A General Coordination Scheme for Zero-sequence Current Diff...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Zongchao Huang Yinhong Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science & Technology Wuhan China

ISBN: (数字)9781728196060

ISBN: (纸本)9781728196077

The present study of zero-sequence current differential protection (ZCDP) with series compensation has not considered the equivalent impedance characteristic of series compensation, and meanwhile cannot put forward a universal coordination scheme feasible for multi-circuit lines. In this paper, the equivalent impedance characteristic of the series capacitor (SC) device and the effect of SC on the operating characteristics of ZCDP under single-circuit and multi-circuit conditions are analyzed. Based on the analysis, a general coordination scheme for ZCDP on series-compensated multi-circuit line is proposed, of which the presented sensitivity coefficient is able to reflect the sensitivity of current differential protection. A power grid experiment is used to demonstrate the correctness of the analysis and the effectiveness of the proposed scheme.

关键词： Sensitivity Power transmission lines System integration Power grids Topology Internet Impedance

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A Neural Network and NSGA-II Based Multi-objective Optimization Design Method for Permanent Magnet Synchronous Machine 19

A Neural Network and NSGA-II Based Multi-objective Optimizat...

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19th International Symposium on electromagnetic Fields in Mechatronics, Electrical and Electronic engineering, ISEF 2019

作者： Zheng, Yinzhao Zhou, Libing Wang, Jin Ma, Yiming Zhao, Junchen Chen, Zheng Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728115603

This paper presents a multi-objective optimization design method for permanent magnet synchronous machine (PMSM) by using back propagation neural network combined with non-dominated sorting genetic algorithm II (NSGA-II). First, neural network is used to map out the nonlinear relationship between the structural parameters of the machine and the output performances, such as average torque and torque ripple. Then NSGA II is implemented to find out the Pareto-optimal front. According to the Pareto-optimal front, optimal structure parameters of the PMSM for the best output optimization results are selected. © 2019 IEEE.

关键词： Multiobjective optimization

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Quasi-static magnetic compression of field-reversed configuration plasma: Amended scalings and limits from two-dimensional MHD equilibrium

arXiv

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arXiv 2022年

作者： Bala, Abba Alhaji Zhu, Ping Li, Haolong Ding, Yonghua Liu, Jiaxing Wan, Sui He, Ying Li, Da Wang, Nengchao Rao, Bo Wang, Zhijiang 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 School of Physics Huazhong University of Science and Technology Hubei Wuhan430074 China Department of Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Department of Physics Federal University Dutse Jigawa Nigeria

In this work, several key scaling laws of the quasi-static magnetic compression of field reversed configuration (FRC) plasma [Spencer, Tuszewski, and Linford, 1983] are amended from a series of 2D FRC MHD equilibriums numerically obtained using the Grad-Shafranov equation solver NIMEQ. Based on the new scaling for the elongation and the magnetic fields at the separatrix and the wall, the empirically stable limits for the compression ratio, the fusion gain, and the neutron yield are evaluated, which may serve as a more accurate estimate for the upper ceiling of performance from the magnetic compression of FRC plasma as a potential fusion energy as well as neutron source devices. Copyright © 2022, The Authors. All rights reserved.

关键词： Magnetoplasma

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Reinforcement Learning for Optimal Allocation of Superconducting Fault Current Limiters

Reinforcement Learning for Optimal Allocation of Superconduc...

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IEEE General Meeting Power& Energy Society

作者： Xiejin Ling Yinhong Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9781728155081

ISBN: (纸本)9781728155098

Superconducting fault current limiter (SFCL) is a new type of current limiting equipment that can restrict the short circuit current level in power systems without impacting on their normal operations. However, the existing SFCL allocation methods have disadvantages of long computation and unstable convergence. Recent advances in the area of artificial intelligence provide the possibility to achieve the optimal SFCL allocation with the consideration of both speed and convergence. To this end, the SFCL allocation is converted into a Reinforcement Learning (RL) problem in this paper. A designer to find the optimal SFCL allocation is viewed as an agent, and the power system is regarded as the environment. The agent adjusts the location and size of SFCLs to respond to the feedback from the environment optimally. The Q-learning algorithm is applied to solve the RL problem. The experimental results demonstrate the effectiveness and superiority of the proposed method.

关键词： Short-circuit currents Reinforcement learning Power system stability Resource management Fault current limiters Optimization Convergence

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Meteorlogical outliers detection based on artificial intelligence 2

Meteorlogical outliers detection based on artificial intelli...

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2nd International Conference on Environmental Prevention and Pollution Control Technologies, EPPCT 2020

作者： Xue, F. Zheng, W. Zhang, M. Wu, Q. Yang, Z. Ai, X. 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 Wuhan Hubei430074 China China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology Wuhan Hubei430074 China

To precisely evaluate the effect of artificial precipitation of Project Tianshui, anomaly data within the large dataset collected is supposed to be detected and dealt with reasonably, to enhance the analysis and prediction of the data. Using the data accumulated from 2008 to 2017 from Wushaoling Meteorological Station, and the data from May 2019 to October 2019 from the dedicated supervising network built for the project, taking temperature(0.1°C) and other meteorological data as example, anomaly dectection is conducted by the arithmetics Local Outlier Factor and Isolation Forest respectively. Consistency check is also conducted via the two arithmetics. The main outliers of the accumulated data for ten years are isolated outliers. LOF works pretty well, while Isolation Forest performs unsatisfying. The main outliers of the dedicated supervising network data are of a continuous outlier sequence. LOF can hardly detect the anomaly, while Isolation Forest precisely find out the outliers. Both arithmetics perform well on consistency check in space. The differences of LOF and Isolation Forest are compared. New ideas of using artificial intelligence arithmetics to detect meteorological outliers and pre-process the data are provided. © 2020 IOP Publishing Ltd. All rights reserved.

关键词： Artificial intelligence

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Variable Turn Rectangular Wire Winding Permanent Magnet Machine

Variable Turn Rectangular Wire Winding Permanent Magnet Mach...

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International Conference on Electrical Machines, ICEM

作者： Yu Zhao Dawei Li Tonghao Pei Ronghai Qu Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9781728199450

ISBN: (纸本)9781728199467

Nowadays, the rectangular wire winding permanent magnet machines for electric vehicle application have drawn more and more attentions due to their high torque density and high efficiency. However, considering the conductors in the rectangular wire winding always have much higher cross section area than that of regular machines with stranded windings, the rectangular wire winding machines suffer big AC losses especially at the high speed condition due to severe proximity and skin effects. In this paper, a variable turn rectangular wire winding machine with 48-slot 8-pole 4/2-layer has been proposed to restrict the AC losses, where the conductors near the slot opening can be disconnected at designed operating speed according to the control of centrifugal switch. Especially, based on the unique process craft of rectangular wire winding, the corresponding 4/2-layer winding connection have been properly designed with little increase of the cost and process difficulty. What's more, the performance of proposed machine has been compared with the regular 4-layer rectangular wire winding machine, which indicated that the power density, torque density, efficiency and flux-weakening capability can be significantly improved.

关键词： Windings Wires Conductors Torque Welding Switches Skin effect

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Effect of High-Speed Train on Vibration and Fatigue Life of Transmission Lines

Effect of High-Speed Train on Vibration and Fatigue Life of ...

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Electrical engineering (CIYCEE), IEEE China International Youth Conference on

作者： Ming Yin Yizhong Guo Zhenghao He State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9781728196596

ISBN: (纸本)9781728196602

There are frequent reports of cable rupture accidents on the transmission line crossing high-speed railways. A simulation method for dynamic response and fatigue life of transmission lines considering natural wind and train induced wind is presented and verified by field tests. Based on a case study, the displacement time history and fatigue damage of conductors under wind loads are analyzed, and the effects of different parameters are discussed. The results show that the fatigue damage caused by train induced wind can reach 127% of natural wind, and its influence on the fatigue life of transmission lines cannot be ignored. Raising height or avoiding the most unfavorable span length can effectively reduce the influence of train induced wind. The proposed method can be used for the structural design and safety assessment of transmission lines crossing the high-speed railway, and it can provide references to the design of damping devices.

关键词： Vibrations Rails Power transmission lines Fatigue Conductors Rail transportation Safety

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Non-stop power ice melting device based on the cooperation of grounding reactor and adjustable reactor

Non-stop power ice melting device based on the cooperation o...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Yuning Hou Tingkang Wang Fan Zhou State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9784886864192

ISBN: (纸本)9781728189307

In this paper, using the characteristics of asymmetrical short circuit of single-phase grounding system, the zero-sequence current path does not affect the positive-sequence current, so a zero-sequence circuit with very small zero-sequence impedance is constructed, and the non-stop ice melting can be achieved by adjusting the impedance of the zerosequence circuit, And designed a zero-sequence reactance device according to the parameters of a certain pilot circuit.

关键词： Ice Grounding Inductors Impedance Power transformer insulation Oil insulation Windings

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Research on a Fundamental and Harmonic Detection Method Based on D-Q Rotating

Research on a Fundamental and Harmonic Detection Method Base...

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作者： Jie Gong Feng Xue Guangyi Zhang Wenhao Pan Tingkang Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and Technology

The widespread use of power electronics in power systems has led to increasingly serious power quality problems in power systems. Active power filters play an important role in governing the harmonics of power systems. The fast and accurate detection of fundamental and harmonic currents in power systems is one of the key aspects of power filters to manage harmonics. In this paper,a new detection method for the fundamental or the nth harmonic component of the fundamental by presetting the frequency of the d-q conversion matrix is proposed. Analysis of simulation results shows that the detection method is not affected by the voltage distortion or asymmetry of the three-phase circuit,and that the results for fundamental and harmonic detection. The ability to accurately reflect changes in frequency and amplitude excursions.

关键词： simulation Research on a Fundamental and Harmonic Detection Method Based on D-Q Rotating

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