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Design and control of the accelerator grid power supply-conversion system applied to CFETR N-NBI prototype

Plasma Science and technology 2020年第8期22卷 175-183页

作者： Dongyu WANG Ming ZHANG Shaoxiang MA Shu YANG Kexun YU Yuan PAN State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074People's Republic of China School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhan 430074People's Republic of China

The acceleration grid power supply(AGPS)rated 200 kV/25 A is a key component devoted to supply the acceleration grids of the China fusion engineering test reactor negative-ion-based neutral beam injector(N-NBI)prototype *** paper focused on the design and control of the AGPS conversion system(AGPS-CS),with emphasis on the requirement of the wide range output voltage and rise time.A voltage regulation switch at the front of step-down transformer is applied to optimize the grid current and DC-link ***,a new feedforward control strategy with piecewise PI compensator is proposed to improve the characteristics of *** simulation results of the proposed AGPS-CS are presented,proving the performance of the power supply to achieve the desired requirements.

关键词： CFETR NBI accelerator grid power supply feedforward control high voltage power supply

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Effects of helium massive gas injection level on disruption mitigation on EAST

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Plasma Science and technology 2021年第7期23卷 31-38页

作者： Abdullah ZAFAR Ping ZHU Ahmad ALI Shiyong ZENG Haolong LI CAS Key Laboratory of Geospace Environment and Department of Engineering and Applied Physics University of Science and Technology of ChinaHefei 230026Peopleʼs Republic of China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074Peopleʼs Republic of China Department of Engineering Physics University of Wisconsin-MadisonMadisonWI 53706United States of America Pakistan Tokamak Plasma Research Institute Islamabad 3329Pakistan Department of Plasma Physics and Fusion Engineering University of Science and Technology of ChinaHefei 230026People’s Republic of China

In this study,NIMROD simulations are performed to investigate the effects of massive helium gas injection level on the induced disruption on EAST *** is demonstrated in simulations that two different scenarios of plasma cooling(complete cooling and partial cooling)take place for different amounts of injected *** the impurity injection above a critical level,a single MHD activity is able to induce a complete core temperature *** impurity injection below the critical level,a series of multiple minor disruptions occur before the complete thermal quench.

关键词： massive gas injection MHD instabilities major disruption minor disruption

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Understanding the Environmentally Driven Corrosion Behavior and Mechanism of Aln/Mo Functionally Graded Materials Exposed to Li/Lif-Licl-Libr Vapor

SSRN

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SSRN 2022年

作者： Jia, Mingyong Chen, Fei He, Yaling Wu, Yueqi Shen, Qiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

The environment temperature-driven corrosion behavior and mechanism of Li/LiF-LiCl-LiBr vapor on AlN/Mo functionally graded materials were investigated. It is shown that the corrosion failure of AlN/Mo FGMs driven by Li vapor begins at 650 ℃. Li vapor not only diffuses along the grain boundaries of AlN but also enters the interior of the adjacent AlN grains, leading to the disintegration of the AlN matrix. The 3D framework of Mo is hardly affected in Li/LiF-LiCl-LiBr vapor, preventing the cracking caused by inconsistent deformation inside the AlN/Mo sealing component. This work provides a reference for the operating temperature of liquid metal batteries. © 2022, The Authors. All rights reserved.

关键词： Aluminum nitride

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High Energy Density Li-ion Battery by Ultra-thick Dry Coating Cathode

High Energy Density Li-ion Battery by Ultra-thick Dry Coatin...

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Power engineering (ICPE), International Conference on

作者： Fengqian Wang Jun Zhong Jinqiao Du Jie Tian Shun Tang Yuan-Cheng Cao School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan China Shenzhen Power Supply Co. Ltd China Southern Power Grid Shenzhen China State Key Laboratory of Advanced Electromagnetic Engineering and echnology Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331531140

ISBN: (纸本)9798331531157

In the pursuit of a sustainable future, lithium-ion battery is an indispensable energy storage device in grid-scale energy storage systems. However, the prevalent cathode electrode manufacturing processes encounter obstacles in terms of their environmental harmfulness and costliness, primarily attributed to the toxic solvent desiccation and reclamation stages. Moreover, the reliance on lithium-ion batteries particularly underscores the necessity for augmenting energy density, both in terms of volume and weight, with the cathode as the pivotal factor. Dry electrode fabrication emerges as an economical approach to attain heightened material loadings. Herein, we utilize binder fibrillation method to prepare 5 kinds of thickness cathode, the research shows that the dry electrode exhibits a capacity retention of 51.7%, surpassing the 44.3% retention of the traditional wet-based electrode at a loading of roughly $30 mg \mathbf{c m}^{-2}\left(4 \mathrm{mAh} / \mathrm{cm}^{2}\right)$ and is also capable of performing at ultra-high loadings up to $100 \mathrm{mg} \mathrm{cm}{ }^{-2}$ ($20 \mathrm{mAh} / \mathrm{cm}^{2}$). This exceptional cycling endurance can be attributed to a robust, interconnected binder fiber by air mill and enhanced mechanical attributes.

关键词： Lithium-ion batteries Solvents Power engineering Manufacturing processes Loading Optimization methods Power system stability Optical fiber devices Cathodes Energy storage

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Substation-area Backup Protection Scheme for the Failure of 10kV Line Protection Device

Substation-area Backup Protection Scheme for the Failure of ...

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2021 International Conference on Energy, Power and Electrical engineering, EPEE 2021

作者： Wang, Yuxue Liu, Wei Jiao, Shaolin Fang, Zeya Li, Yiquan Wen, Minghao Power Dispatching Control Center of Guangdong Power Grid Guangzhou510600 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

The research on wide-area backup protection for high-voltage transmission lines has made certain progress in recent years, but there are few reports published on substation-area backup protection for low-voltage 10kV transmission lines. Based on the characteristics of shared information in intelligent substation, a substation-area backup protection scheme to deal with the failure of 10kV line protection device is proposed in this paper. This scheme uses the device self-test information and heartbeat mechanism to monitor the operation status of 10kV line protection devices;to realize the substation-area backup protection for the 10kV transmission lines when any line protection device fails, the protection criterion is constructed by the action results of power directional elements of transformer protections and other 10kV line protections. The proposed scheme can greatly improve the speed of the fault isolation and has low requirements for data demand and synchronization. PSCAD simulation results show that the proposed method is with high correctness and feasibility. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Electric lines

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Research on Protection Tripping Scheme of Multiple Criteria with High Reliability for HV Transmission Lines 4

Research on Protection Tripping Scheme of Multiple Criteria ...

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

作者： Jin, Neng Li, Gan Liang, Zhikai Wu, Gang Fang, Yanchen Lin, Xiangning Planning Design and Research Co. Ltd Changjiang Institute of Survey Hubei China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei China

ISBN: (纸本)9781728171494

The abnormities occurring at any part of sampling process may cause the maloperation of dual-configured protection systems in smart substations. To cope with this problem, multiple differential protection criteria are formed, which use the currents acquired from the lines that connect to the busbars connecting to the double ends of the protected line. All the acquired information is shared in the substation area protection platform. Then, a novel protection tripping scheme of multiple criteria for high voltage (HV) transmission line is proposed. Theoretical analysis and simulation results indicate that compared with the existing 1-out-of-2 tripping scheme, the proposed protection tripping scheme is immune to the abnormities of current transformer (CT) such as saturation, interference and disconnection, which can effectively enhance the reliability of line protection. © 2021 IEEE.

关键词： Electric instrument transformers

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Measurement of Inhomogeneous Electric Field Based on Electric Field-Induced Second-Harmonic Generation

SSRN

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SSRN 2023年

作者： Chen, Shen He, Hengxin Chen, Ying Liu, Zhenyu Xie, Siyuan Che, Junru He, Kun Chen, Weijiang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science of Technology Wuhan China China Electric Power Research Institute Beijing China State Grid Corporation of China Beijing China

The electric field-induced second-harmonic generation (E-FISH) method can offer high spatiotemporal resolution in electric field measurement, but faces challenge in reconstructing the inhomogeneous electric field along the probing laser. This paper presents an inversion method to reconstruct the electric field profile by using E-FISH signals measured from multiple points along the probing laser. The relationship between the condition number of the inversion coefficient matrix and the parameters of E-FISH measurement system is clarified. The inversion method is validated through experimental investigations conducted in three different electrode configurations, namely the plate-to-plate gap, the rod-to-rod gap, and the rod-plate gap. With the inhomogeneity coefficient varies from 1 to 10.7, the maximum deviation between the measured electric field and the finite element simulation is less than 6%. This method does not rely on priori assumptions and electrode configurations, and exhibits good robustness in resisting the effect of measurement noise on the inversion accuracy. © 2023, The Authors. All rights reserved.

关键词： Electric fields

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On the Limit Cycle Caused by Controller Saturation in Synchronous Buck Converter

On the Limit Cycle Caused by Controller Saturation in Synchr...

引用

International Conference on Power Electronics (ICPE)

作者： A. Ying Xu B. Xuehua Wang C. Yuying He D. Hao Zhang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan P. R. China College of Energy and Electrical Engineering Hohai University Nanjing P. R. China

In the reported instability incidents of power converter-based systems, a constant-amplitude oscillation instead of divergence was often observed, which is the so-called limit cycle phenomenon. This does not agree with theoretical analysis based on classical linear control theory. Taking a synchronous buck converter as an example, this paper aims to investigate the underlying mechanism of the limit cycle phenomenon. It finds that this phenomenon results from the nonlinear controller saturation. To clarify the underlying mechanism, the controller saturation is linearized through the describing function method, then the generalized Nyquist stability criterion is applied. It reveals that the system operation point dynamically drifts and ultimately stays at the critically stable point, featuring the constant-amplitude oscillation. Moreover, the occurrence condition and the calculation of the oscillating amplitude and frequency are also explored. Simulations and experiments verify the correctness of the analysis.

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Repetitive Control-Based Torque Ripple Reduction Method for SRM Drive 5

Repetitive Control-Based Torque Ripple Reduction Method for ...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Wu, Yiying Wang, Shuanghong Li, Longchun He, Miao Zhong, Cheng Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Shaanxi Aero Electric Co. Ltd Xian China Guizhou Aerospace Linquan Motor Co. Ltd Guizhou China Aerospace Heavy Industry Co. Ltd Wuhan China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

In this paper, a torque ripple suppression strategy of SRM based on repetitive control was proposed. Due to the doubly salient structure of SRM, the rate of rising current and falling current is different in the current commutation period, which leads to a large fluctuation of electromagnetic torque. In the conventional current chopping control, the current would exceed the hysteresis range in practical application due to the insufficient switching frequency. Therefore, a repetitive controller has been used in the speed loop to generate a periodic current reference signal, which can improve the reference current in advance. And the improved soft current chopper control combined with PWM is adopted in current loop to reduce the torque ripple caused by current overshoot in the single-phase excitation stage. In this paper, an SRM control system based on repetitive control has been constructed. The proposed control strategy is verified by simulation, and the FFT analysis is used to illustrate the effect of the strategy on the suppression of torque ripple, which proves that the proposed control method can effectively reduce the torque ripple. © 2022 IEEE.

关键词： Torque

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Development of High Superconductor Fraction (Ba, K)Fe2as2 Wires with Improved Uniformity by Two-Axial Rolling

SSRN

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SSRN 2024年

作者： Xiong, Hao Yao, Chao Guo, Wenwen Yang, Peng Ren, Zhihong Wang, Dongliang Zhang, Xianping Ma, Yanwei Key Laboratory of Applied Superconductivity Institute of Electrical Engineering Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu Zhongke Jinan250013 China

Iron-based superconductors are regarded as prospective candidates for high magnetic field applications since they have very high upper critical field and low anisotropy. For practical applications, it is important to develop superconducting wires with strong current carrying capability. In this work, Cu/Ag composite sheathed (Ba, K)Fe2As2 (Ba-122) iron-based superconducting wires were fabricated with a two-axial rolling deformation process and a subsequent hot isostatic pressing (HIP) heat treatment. Compared with the previously reported Cu/Ag/Ba-122 wires prepared with groove rolling, the two-axial rolling allowed to used much thinner Cu/Ag composite sheath for wire fabrication, thus greatly increasing the filling factor of superconducting materials by about 5 times to 24%, and in addition lowering the volume fraction of silver down to 16% in wires. By a comparative study on the microstructure and superconducting properties between the wires made by two-axial rolling and groove rolling processes, it is found that except for the significantly increased engineering critical current density, the former also exhibits improved homogeneity of mass distribution and uniformity of Ba-122/Ag interfaces, resulting in significantly enhanced n-values over 40 in magnetic fields up to 14 T. Our work is suggested that two-axial rolling combined with HIP processes presents a promising approach to prepare iron-based superconducting wires with high filling factor, high uniformity and low cost for practical applications. © 2024, The Authors. All rights reserved.

关键词： Hot isostatic pressing

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