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Power Energy Systems and Applications (ICoPESA), International Conference on

作者： Yiran Dong Hengchu Shi Dezhi Kong Hao You Jing Chen Shoudong Xu Jinfu Chen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Yunnan Electric Power Dispatching and Controlling Center China Southern Power Grid Kunming China System Analysis Department Scientific Research Institute of Yunnan Power Grid Kunming China

With the ever-increasing scale of wind power, the fault characteristics of power grids have changed dramatically, and the existing relay setting calculation approaches can no longer meet the requirements of modeling. The wind turbine generator (WTG) is usually treated as constant current source or set to zero to adapt to the traditional short-circuit current calculation software. This method does not consider the fault characteristics of the WTG, so the calculation accuracy is lower than that of iteration. However, the iterative algorithm also has problems, such as non-convergence or too many iterations leading to long computation time. Therefore, a calculation method of short-circuit current considering WTG integrated is proposed in this paper, which can solve the problem of iteration non-convergence while ensuring accuracy within the allowable range of engineering. Firstly, the WTG short-circuit current models considering converter control strategy and fault characteristics are established. Then, the branches with WTG are converted into "constant potential source + equivalent impedance" to facilitate WTG embedding in the relay protection setting calculation software and maintain consistency with the traditional synchronous generator equivalent mode. In addition, the calculation formula of equivalent impedance is deduced, and the modified voltage is also proposed to improve the accuracy. Finally, a simulation is performed in GIRGE B4-39 and part of actual power grids structures in a province to verify engineering practical value of the proposed method.

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Net Damping Criterion for Stability Analysis of Grid-tied VSCs in DC Voltage Control Timescale

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CSEE Journal of Power and Energy Systems 2020年第3期6卷 601-609页

作者： Dong Wang Yunhe Hou Jiabing Hu School of Automation Wuhan University of TechnologyWuhan 430070China Department of Electrical and Electronic Engineering The University of Hong KongHong KongChina HKU Shenzhen Institute of Research and Innovation Shenzhen 518057China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China

Stability of grid-connected VSCs in DC voltage control(DVC)timescales(i.e.,the frequency range of dynamics covering converter outer controls)has recently caught increased attention,while the existing approaches,such as eigenvalue analysis and dq-domain impedance analysis,have respective limitations on addressing these types of stability *** paper proposes an alternative net damping criterion dedicated for analyzing the DVC timescale stability in a multi-VSC *** criterion is strictly mapped from the Nyquist stability criterion utilizing the gain margin concept,which preserves the advantages of the classical positive net damping criterion suggested by Canay[20]–allowing for decomposition analysis of a subsystem’s contribution to the closed-loop stability in a single-input single-output(SISO)framework,but overcomes its deficiency of possibly erroneous prediction of system dynamic *** studies show that the proposed criterion can correctly predict some unstable conditions(e.g.,monotonic divergence)which cannot be identified by the classical net damping ***,the condition for when the classical criterion is available is also pointed out,the proposed criterion can also act as a complement of the classical criterion for stability examination.

关键词： DC voltage control timescale multiple VSCs net damping criterion stability

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Application of 3D MHD equilibrium calculation to RMP experiments in the J-TEXT tokamak

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Plasma Science and technology 2021年第8期23卷 70-81页

作者： Zhaosu WANG Yunfeng LIANG Zhonghe JIANG Jie HUANG Yasuhiro SUZUKI Alexander KNIEPS Song ZHOU Jinyu XIONG Jiankun HUA Zhipeng CHEN Zhongyong CHEN Nengchao WANG Zhoujun YANG Yonghua DING Yuan PAN 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 430074People's Republic of China Forschungszentrum Jülich GmbH Institute für Energie-und Klimaforschung—Plasmaphysik52425 JülichGermany Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China National Institutes of Fusion Sciences National Institutes of Natural SciencesOroshi-cho322-6Toki 509-5292Japan SOKENDAI The Graduate University for Advanced StudiesOroshi-cho322-6Toki 509-5292Japan Chengdu University Chengdu 610106People's Republic of China

The application of resonant magnetic perturbation(RMP)coils could break the initial axisymmetry and change the magnetic topology in tokamak *** understand the plasma equilibrium response to the RMP fields,three-dimensional(3 D)non-linear magnetohydrodynamics equilibrium calculations have been carried out using the HINT code for an RMP field-penetration experiment on *** HINT code does not assume perfectly nested flux surfaces,and is able to consider directly the change of magnetic topology due to the RMP field *** between 3 D equilibrium calculations and experimental observations are *** magnetic topologies calculated by HINT were compared with the field topologies obtained from a vacuum approximation *** turns out that the effects of redistribution of plasma pressure and current due to the formation of magnetic islands at various resonant rational surfaces should be considered self-consistently for understanding the change of magnetic *** changes include changes in the shape and size of magnetic islands,and the distribution of stochastic fields around the magnetic islands and at the plasma boundary,which plays an important role for plasma-wall interactions.

关键词： 3D equilibrium RMP magnetic topology

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Magnetic shielding of wireless power transfer using zero permeability metamaterial slab 1

Magnetic shielding of wireless power transfer using zero per...

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

作者： Lu, Conghui Huang, Xiutao Rong, Cancan Tao, Xiong Zeng, Yingqin Liu, Xiaobo Liu, Minghai Huazhong University of Science and Technology School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China Aerospace Institute of Advanced Material Processing Technology Beijing100074 China

ISBN: (纸本)9781728196596

electromagnetic radiation generated by the wireless power transfer (WPT) can be harmful to humans and environment. In order to satisfy the safety requirements, electromagnetic leakage to the nearby transmission channels should be controlled below a safe level. Except for the ferrite and metallic shielding materials, several researchers have put forward the zero-permeability metamaterial (ZP-MM). However, there have been few scientific studies with the application of ZP-MM in four-coil WPT systems. In this paper, we propose an optimized ZP-MM for shielding leaked magnetic field. Next, we setup a miniaturized WPT system loaded with ZP-MM at 13.56MHz. As a result, when ZP-MM is used, the transmission efficiency is reduced about 28.8% and the magnetic field magnitude of the receiver has been decreased about 72.7%, compared to free space. To better highlight the shielding effect, the aluminum plate is inserted in the middle of the Tx and Rx coils. The results show that the shielding effect of ZP-MM is better than aluminum plate. Obviously, the proposed ZP-MM has good performance in magnetic field shielding for WPT systems. © 2020 IEEE.

关键词： Magnetic fields

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Influence of the X-point location on edge plasma transport in the J-TEXT tokamak with a high-field-side single-null divertor

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Plasma Science and technology 2021年第12期23卷 42-54页

作者： Hao WANG Yunfeng LIANG Shuai XU Zhonghe JIANG Yuhe FENG A KNIEPS P DREWS Jie YANG Xin XU Ting LONG Shaodong JIAO Xiaolong ZHANG Zhigang HAO Qinglong YANG Zhipeng CHEN Zhongyong CHEN Nengchao WANG Zhoujun YANG Xiaoqing ZHANG Yonghua DING Yuan PAN the J-TEXT Team 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 430074People's Republic of China Forschungszentrum Julich GmbH Institut fur Energie-und Klimaforschung-PlasmaphysikPartner of the Trilateral Euregio Cluster(TEC)52425 JiilichGermany Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China Max-Planck-Institut fur Plasmaphysik EURATOM Association17491 GreifswaldGermany Southwestern Institute of Physics Chengdu 610041People's Republic of China Advanced Energy Research Center Shenzhen UniversityShenzhen 518060People's Republic of China

High-density experiments in the high-field-side mid-plane single-null divertor configuration have been performed for the first time on *** experiments show an increase in the highest central channel line-averaged density from 2.73×10^(19)m^(-3) to 6.49×10^(19)m^(-3),while the X-point moves away from the target by increasing the divertor coil *** corresponding Greenwald fraction rises from 0.50 to *** the impurity transport,the density normalized radiation intensity(absolute extreme ultraviolet and soft x-ray)of the central channel density decreased significantly(>50%)with an increase in the plasma *** better understand the underlying physics mechanisms,the 3 D edge Monte Carlo code coupled with EIRENE(EMC3-EIRENE)has been implemented for the first time on *** simulation results show good agreement with the experimental *** the X-point moves away from the target,the divertor power decay length drops and the scrape-off layer impurity screening effect is enhanced.

关键词： edge plasma transport divertor configuration EMC3-EIRENE

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Prospects for Power Systems with High Proportion of Renewable Energy Considering the Coordination of Source-grid 14

Prospects for Power Systems with High Proportion of Renewabl...

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14th International Conference on Computer and Electrical engineering, ICCEE 2021

作者： Ling, Xu Yu, Haiyang Wang, Yuan Wu, Yaowu Liang, Shuhao Hu, Zhigang Central China Branch of State Grid Corporation of China Wuhan430074 China China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

In the future, the spatiotemporal distribution of a high proportion of renewable energy will bring unprecedented challenges to power system, and the basic form and operation of power system will have great changes. On the basis of investigating the research status in China and abroad, this paper expounds the scientific problems faced by the planning of Power Systems with High Proportion of Renewable Energy (PSHPRE) considering the coordination of source-grid, and put forward the basic ideas and framework of research from four aspects: overview of the development of PSHPRE, power planning in PSHPRE and coordinated planning of source-grid in PSHPRE. Finally, the prospects for Power Systems with High Proportion of Renewable Energy considering the coordination of source-grid are presented. © Published under licence by IOP Publishing Ltd.

关键词： Renewable energy resources

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Toroidal component of velocity for geodesic acoustic modes in the edge plasmas of the J-TEXT tokamak

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Plasma Science and technology 2021年第10期23卷 112-119页

作者： Yaoyu Xie Kaijun Zhao Zhipeng Chen Jiaqi Dong Kimitaka Itoh Zhongyong Chen Yuejiang Shi Yonghua Ding Jun Cheng Longwen Yan Hai Liu Zhifeng Cheng Zhoujun Yang Nengchao Wang Lu Wang Jianqiang Xu Yunfeng Liang J-TEXT Team School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013People’s 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 430074People's Republic of China Southwestern Institute of Physics Chengdu 610041People's Republic of China Institute of Science and Technology Research Chubu UniversityKasuga 816-8580Japan Research Center for Plasma Turbulence Kyushu UniversityKyushu UniversityChubu UniversityAichi 487-8501Japan National Institute for Fusion Science Toki 509-5292Japan ENN Science and Technology Development Co. Ltdand Hebei Key Laboratory of Compact FusionLangfang 065001People's Republic of China Institute of Fusion Science School of Physical Science and TechnologySouthwest Jiaotong UniversityChengdu 610031People's Republic of China

The toroidal component of the velocity for geodesic acoustic modes(GAMs)is first *** Langmuir probe arrays set up near the top tokamak of the J-TEXT were utilized for this study.A significant peak at the GAM frequency is observed in Mach number *** toroidal velocity for the GAMs is estimated as 10–100 ms-1 and increases with the poloidal *** ratio of toroidal component to the poloidal one of the velocity is mainly located in the interval between 0.3 and *** higher safety factors q,the ratio almost does not change with decreasing the safety factor,whereas it goes up sharply at low *** coherencies between poloidal electric fields and Mach number fluctuations in turbulence frequency bands are also evaluated,and are higher than those between radial electric fields and Mach number fluctuations.

关键词： zonal flow geodesic acoustic mode tokamak return flow Mach number

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Transient Stability Enhancement of a Multi-Machine Power System Using Modified Flux-Coupling-Type Superconducting Fault Current Limiters

Transient Stability Enhancement of a Multi-Machine Power Sys...

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2020 IEEE International Conference on Applied Superconductivity and electromagnetic Devices, ASEMD 2020

作者： Hu, Ruizhe Chen, Lei Chen, Hongkun Xu, Ying Ren, Li Tang, Yuejin School of Electrical Engineering and Automation Wuhan University Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781728152158

This paper investigates the application of modified flux-coupling-type superconducting fault current limiters (SFCLs) in enhancing the transient stability of a multi-machine power system (MMPS). The mathematical model of the modified SFCLs and the transient energy function of the MMPS are established in the study. Theoretical analysis indicates that applying the modified SFCLs enables to reduce the transient energy at fault clearance time and increase the robustness of the MMPS. Furthermore, using the MATLAB platform, the simulation test of the generator rotor swing curves with and without the modified SFCLs is carried out in a benchmark IEEE 9-bus system. The simulation results verify the correctness of the theoretical analysis. © 2020 IEEE.

关键词： Superconducting fault current limiters

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DC Transform Circuit Design Based on Multiplier Rectification

DC Transform Circuit Design Based on Multiplier Rectificatio...

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Workshop on Wide Bandgap Power Devices and Applications in Asia (WiPDA Asia)

作者： Penghui Yin Xuehua Wang Xinbo Ruan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan P.R.China

ISBN: (纸本)9781665448178

Due to the high reliability and high efficiency, the DC/DC converters are rapidly developing. However, a challenge is faced which is the output voltage range of the DC/DC converter is limited by the withstand voltage of the device in practice. In order to solve this problem, this paper designs a DC/DC circuit based on the voltage double rectifier circuit and half-bridge LLC topology. It realizes high voltage output in the case of low voltage input. Meanwhile, the requirements for the withstand voltage of the device are relaxed, which is convenient for the selection of the device. Furthermore, the zero voltage switch (ZVS) of the primary-side switches and the zero current switch (ZCS) of the secondary-side diodes can be achieved. The correctness and effectiveness of the proposed method are finally verified by simulation.

关键词： Simulation Asia Rectifiers Voltage Switches Transforms Zero voltage switching

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Sodium phytate stabilizing lattice oxygen in high-nickel oxide cathodes for thermal runaway inhibition and high voltage operation

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Science bulletin 2025年

作者： Yuanke Wu Qiang Wu Ziqi Zeng Yixuan Dong Shijie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China. State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China. State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China. Electronic address: ziqizeng@***. State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China. Electronic address: xiejia@***.

The reactive oxygen species (O*) released from the nickel-rich layered oxide cathodes (LiNiCoMnO, NCM) are responsible for triggering thermal runaway (TR) in lithium-ion batteries (LIBs). Specifically, the charge compensation from transition metal (TM) 3d to oxygen (O) 2p in NCM plays a pivotal role in O* release. Here, inspired by the strong chelating effect of sodium phytate (PN) on TM, we employ PN as a cathode additive to coordinate with nickel, thereby weakening the charge compensation of TM 3d to O 2p on the surface of LiNiCoMnO (NCM811) and ultimately enhancing battery safety. It is shown that the chelation successfully stabilizes lattice oxygen and suppresses the release of O*, preventing detrimental phase transitions in NCM811 and reducing heat generation from O* related crosstalk reactions. Consequently, the TR trigger temperature (T) of NCM811 pouch cell with PN elevates from 125.9 to 184.8 °C, while the maximum temperature (T) decreases from 543.7 to 319.7 °C. Moreover, the PN-derived modification layer allows NCM811 to maintain exceptional cycling stability for over 700 cycles at 4.6 V. This strategy provides a facile method for stabilizing lattice oxygen in NCM, inhibiting O*-triggered TR, and enhancing high-voltage performance.

关键词： Battery safety Chelation Chemical crosstalk Lithium−ion battery Reactive oxygen species Thermal runaway

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