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Performance Analysis of Nested-loop Secondary Linear Doubly-fed Machine Considering End Effects

CES Transactions on Electrical Machines and Systems 2022年第3期6卷 298-305页

作者： Yaping Zhang Jian Ge Wei Xu Weiye Li Yinglu Luo Shihu Su Yunfeng He the State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China IEEE Xiangyang CRRC Zhuzhou Institute CO. LTDXiangyang412001China CRRC Zhuzhou Motor Co. Ltd.Zhuzhou412001China

Nested-loop secondary linear doubly-fed machine(NLS-LDFM) is a novel linear machine evolved from rotary brushless doubly-fed induction machine, which has a good application prospect in linear metro. In order to analyze the performance of NLS-LDFM, the mechanism and action rules of end effects are investigated in this paper. Firstly, the mechanism of static and dynamic end effects is analyzed in aspect of direct coupling, winding asymmetry and transient secondary current. Furthermore, based on the winding theory for short primary linear machines, the machine parameters are established qualitatively considering pulsating magnetic field of NLS-LDFM. Finally, the NLS-LDFM performance analysis is supplemented by the finite element algorithm(FEA) simulation and experiments under different operating conditions.

关键词： Linear doubly-fed machine(LDFM) End effect Parameter analysis Finite element algorithm(FEA)

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Robust Local PMU Measurement Recovery Based on Singular Spectrum Analysis of Hankel Structures

Robust Local PMU Measurement Recovery Based on Singular Spec...

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2021 IEEE Sustainable Power and Energy Conference, iSPEC 2021

作者： Pei, Jianhua Wu, Zhipeng Wang, Jingyu Shi, Dongyuan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9781665414395

The development of cyber-physical power systems gives rise to the concerns on the data quality issue of phasor measurement units (PMUs). Low signal-to-noise ratios (SNRs) and data missing caused by malicious electromagnetic interference, false data injections, and equipment malfunctioning may jeopardize the integrity and availability of power system monitoring, protection, and control applications. To ensure grid resiliency, this paper proposes a PMU measurement recovery method based on the singular spectrum analysis of Hankel structures. It utilizes single or multiple channels of PMU time-series to restore the problematic phasor measurements with low SNRs and data losses. Numerical case studies demonstrate that the proposed method can recover the noise-contaminated measurements with higher accuracy than traditional methods such as filtering and wavelet analysis, and can effectively complete the missed data. The latency margins of power system applications can be satisfied in the mean time. © 2021 IEEE.

关键词： Phasor measurement units

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Island-Oriented Multi-Energy Reef Pan Power Plant and Its Application - Layout Optimization Study and Capacity Exploration

Island-Oriented Multi-Energy Reef Pan Power Plant and Its Ap...

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

作者： Weijie He Fanrong Wei Xiangning Lin Samir M. Dawoud The State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China The Department of Electrical Power and Machines Engineering Tanta University Tanta Egypt

ISBN: (数字)9798331530174

ISBN: (纸本)9798331530181

In response to the problem of unreasonable power supply layout on islands, this paper fully evaluates the status of wind/light/wave energy resources in the island and its surrounding reef area scenarios. Then, based on bladeless wind turbines, floating solar panels and oscillating float wave energy capture devices, an integrated construction layout plan for multi-energy reef power stations was proposed. And with the maximum annual total power generation as the objective function, a layout optimization and capacity exploration model was established. The CPLEX mixed integer programming algorithm was used to solve the model example. The example results show that the construction layout plan proposed in this paper is reasonable and feasible, and has unique advantages in island scenarios.

关键词： Renewable energy sources Power supplies Layout Software algorithms Software Wind turbines Solar panels Wave energy conversion Power generation Optimization

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A Numerical Modeling Method for the Electric Field of Grading Rings of UHVAC Double Circuit Transmission Lines

A Numerical Modeling Method for the Electric Field of Gradin...

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2022 IEEE International Conference on High Voltage engineering and Applications, ICHVE 2022

作者： Liu, Jing Xiao, Lilang Fu, Zhong He, Hengxing Electric Power Research Institute of State Grid Anhui Electric Power Co. Ltd. Hefei230601 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9781665407502

The use of grading rings is an important measure to control the surface electric field of insulators and fittings and thus corona discharges, and realize noise reduction of UHVAC transmission lines. However, due to the coexistence of the tower and insulator strings with the grading rings, the high complexity of simulation models leads to low quality of meshes, long meshing and computation time, and high memory usage, which hinders from fast optimization design of grading rings. Therefore, it is of need to device a numerical modeling method to reduce the complexity. In this paper, a numerical modeling method is proposed. Infinite element method is coupled with finite element method to reduce the modeling errors and the size of the computation domain. The connecting fittings of insulator strings are omitted and plates are used to model the trusses in order to further reduce the complexity. Moreover, The tower can be reduced to 1/4 size of the full model with the help of symmetry and computation experience. A meshing method based on domain decomposition is brought forward to speed up the grid generation. The results show that this modelling method can hugely decrease the complexity of the model and meshing time. © 2022 IEEE.

关键词： Electric lines

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Threee-dimensionally ordered macroporous materials for pollutants abatement,environmental sensing and bacterial inactivation

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中国科学：化学（英文版） 2023年第7期66卷 1886-1904页

作者： Yang Ding Chun-Hua Wang Jia-Song Zhong Qi-Nan Mao Run-Tian Zheng Yun Hau Ng Ming-Hui Sun Soumyajit Maitra Li-Hua Chen Bao-Lian Su Center of Advanced Optoelectronic Materials College of Materials and Environmental EngineeringHangzhou Dianzi UniversityHangzhou 310018China Laboratory of Inorganic Materials Chemistry(CMI) University of NamurNamur B-5000Belgium School of Energy and Environment City University of Hong KongHong Kong 999000China Center of Advanced Optoelectronic Materials College of Materials and Environmental EngineeringHangzhou Dianzi UniversityHangzhou 310018China Laboratory of Inorganic Materials Chemistry(CMI) University of NamurNamur B-5000Belgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Materials University of OxfordOxford OX1 3PHUK Laboratory of Inorganic Materials Chemistry(CMI) University of NamurNamur B-5000Belgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Clare Hall University of CambridgeCambridge CB2 1EWUK

Owing to their facile reactants migration channels,large surface area,maximized exposure of reaction sites and efficient light utilization,three-dimensionally ordered macroporous(3DOM)materials have been extensively adopted in environmental fields such as pollutants removal,environmental detection as well as bacterial *** this review,the up-to-date 3DOM materials,the corresponding synthesis protocols and the related environmental applications involving photo/electrocatalytic pollutants decomposition,thermocatalytic volatile organic compounds(VOCs)elimination,hazardous substances sensing and bacteria inactivation are completely ***,the inherent advantages and mechanisms of 3DOM materials in different environmental utilization are thoroughly demonstrated and ***,the improved performance of environmental applications and the methods of fabricating 3DOM materials are correlated in depth,being favorable for readers to obtain the fundamental knowledge and to motivate some innovative thoughts for modifying 3DOM materials with further elevated environmental remediation ***,the current difficulties and prospects of 3DOM materials for large-scale and commercial applications are *** critical review is anticipated to promote the optimization of 3DOM materials and to ripen the related environmental remediation techniques.

关键词： 3DOM environmental remediation catalysis VOCs disinfection

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Design of Power Supply for FRC Plasma Thruster Driven by Pulsed RMF

Design of Power Supply for FRC Plasma Thruster Driven by Pul...

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

作者： YiSong Zhang Yong Yang Yuxuan Huang Xiaopeng Yi Chaofan Lv Bo Rao Fangwei Lv Ming Zhang International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331530174

ISBN: (纸本)9798331530181

The Field-reversed configuration (FRC) plasma thruster is a propulsion device driven by Pulsed Rotating magnetic field (RMF) to generate thrust. An FRC plasma thruster prototype has been built. The RMF antennas are designed with very high parameters namely a peak current of 4 kA, a resonant frequency of 150 kHz. Thus, a high voltage, high current pulsed power supply is required to satisfy the design. This article mainly presents the challenges and solutions in the design of the power supply system. First, 4 sets of power supplies are used to feed the RMF coils, which results in design parameters of 4 kA/3.5 kV for each power supply. Then, stray parameters control and loss analysis were done to improve power supply efficiency. Experimental tests are also performed on the system. In conclusion, the designed power supply system can satisfy the requirements of high operation parameters and high controllability.

关键词： Power supplies Attitude control Wires Resonant frequency High-voltage techniques Plasmas Safety Magnetic fields Loaded antennas Testing

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A Novel Flux-Regulation Permanent Magnet Excited HIA with Adjustable Relative Position of Two Halves of Rotor

A Novel Flux-Regulation Permanent Magnet Excited HIA with Ad...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Longjian Liu Kexun Yu Xianfei Xie Faculty of Electric Power Engineering Kunming University of Science and Technology China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology China

The homopolar inductor alternator (HIA) has the advantage of high reliability, power density and energy storage density, which is successfully used in pulsed high power supply, power generator in airborne application, flywheel energy storage system, and propulsion system of ship. Though the copper conductor excited HIA has excellent flux modulation performance, its excitation loss is large. The permanent magnet (PM) excited HIA with mechanical flux modulation can address the problem of excitation loss, but it needs a complex extra flux modulator to change the flux. This paper introduces a novel flux-regulation permanent magnet excited homopolar inductor alternator (HIA) with adjustable relative position of two halves of rotor. The structure and operating principle of it are presented in this paper. The flux modulation is analyzed, and the FEM simulation is done to verify the theory of this paper. The simulation results show that the novel HIA has good flux-regulation performance.

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A Novel High-Speed Hybrid PMSM and Homopolar Inductor Alternator Used for Double-Frequency Power Generation System

A Novel High-Speed Hybrid PMSM and Homopolar Inductor Altern...

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International Conference on Electrical Machines and Systems (ICEMS)

In some special applications such as shipping and aerospace, the double-frequency generator is needed. The structure of existing double-frequency generator is complex, and the operating rotating speed of the existing double-frequency generator is not so high, which limits the power density of the double-frequency generator. This paper introduces a novel high-speed hybrid permanent magnet synchronous motor (PMSM) and homopolar inductor alternator (HIA) used for double-frequency power generation system. The novel machine combined the PMSM and HIA, and it has the advantages of both HIA and PMSM. The structure and operating principle of it are presented in this paper. The no-load air-gap magnetic field is analyzed in this paper. The coupling of flux between windings of HIA and PMSM is analyzed. And the FEM simulation is done to verify the theory of this paper; the simulation results show that the novel alternator has good performance for double-frequency power generation system.

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A Generic Understanding of Damping Effect of Wind Power Generation with Inertial Response on Synchronous Generator 4

A Generic Understanding of Damping Effect of Wind Power Gene...

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

作者： He, Wei Huazhong University of Sci. and Tech. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728171494

The inertia control in wind power generation is becoming a necessary trend in the future power system. Thus, the system electromechanical oscillation will be responded by the wind power generation and in turn, it will significantly affect the system electromechanical damping. The different inertia control seemingly has different characteristics and different effect on system damping. In this paper, we use a simplified model to understand the generic damping effect of different inertia control. One typical inertia control method is illustrated to study. This paper aims at helping people to clearly understand and quickly judge the influence of inertia control on system damping. © 2021 IEEE.

关键词： Equations of motion

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A Physics-Information-Enabled Self-Updating Method to Monitor Measurement Error of Capacitor Voltage Transformers

SSRN

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SSRN 2023年

作者： Zhang, Yuxuan Zhang, Chuanji He, Cheng Li, Hongbin Chen, Qing Guo, Panpan Cheng, Cheng SEEE of Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

Understanding long-term monitoring measurement errors of capacitor voltage transformers (CVTs) is critical for acquiring accurate and continuous voltage signals from the power grid. However, existing methods cannot maintain good performance over the long term because they cannot update the initial model while primary voltages fluctuate nor maintain stability while measurement errors deteriorate. To remedy this problem, this paper proposes a physics-information-enabled self-updating method. Differences in fluctuations between primary voltages and measurement errors are illustrated based on the physical structure of CVTs. This information is then used to select samples that only contain fluctuations from primary voltages and update the model. Simulations on data from real substations show that its recognition accuracy reaches 90%. © 2023, The Authors. All rights reserved.

关键词： Measurement errors

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