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2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： Yao, Fuxing Miao, Shihong Wang, Tingtao Wang, Jiaxu Wang, Baisheng Tan, Haoyu School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798331530174

The increasingly frequent severe convective weather poses a serious threat to the reliability of distribution networks. In this regard, an optimal maintenance model that considers pre-disaster defense and post-disaster mitigation stages is proposed to meet the demand for resilience enhancement. During the pre-disaster defense stage, the equipment maintenance plan and the corresponding operation strategy are decided in conjunction with the failure probability of each device. During the post-disaster mitigation stage, the emergency dispatch strategy of the grid is developed considering the diversity of damage results. On these bases, the optimal pre-disaster maintenance strategy considering post-disaster situations is identified by integrating the two stages' outage losses and operating costs. Finally, the numerical results show that the proposed strategy can give an optimal maintenance plan by combining the fragility of each device, which effectively improves the outage prevention and management capability of the distribution network under severe convective weather. © 2024 IEEE.

关键词： Operating costs

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A Fast Analytical Dose Calculation Approach Based on RAMDIM in MR-Guided Proton Therapy 4

A Fast Analytical Dose Calculation Approach Based on RAMDIM ...

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4th International Conference on Electronic Information engineering and Computer technology, EIECT 2024

作者： Chen, Songbin Tan, Ping Xiong, Haimin Qian, Zhihong Tang, Dan School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798331528850

In magnetic resonance-guided proton therapy, protons are deflected in magnetic fields, resulting in distortion of the dose distribution. In dose calculation, Monte Carlo simulation methods are highly accurate but time-consuming. Clinical dose validation requires a fast and accurate method to calculate the dose distribution. In this paper, a fast analytical dose calculation approach is proposed based on Raytracing Algorithm for Magnetic Deflection of Ions in Media. Different energies, different magnetic field strengths and different energy spreads are considered, and the γ-pass rates in all cases exceeds 98%. © 2024 IEEE.

关键词： Proton beam therapy

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Research on Voltage Stabilizing System of Switched Reluctance Motor Based on Fuzzy PID Control 27

Research on Voltage Stabilizing System of Switched Reluctanc...

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27th International Conference on Electrical Machines and Systems, ICEMS 2024

作者： Chang, Tong Wang, Shuanghong Li, Zixin School of Electrical and Electronic Engineering Huazhong University of Science and Technology The State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9784886864406

This paper proposes a control strategy based on fuzzy PID control of Switched Reluctance Motor Generator (SRMG) in response to the voltage fluctuation issues caused by load variations in switched reluctance motor system. This strategy is constructed based on the fundamental principles of closed-loop control and fuzzy control theory, incorporating a parameter-adaptive fuzzy PID controller and system model. Initially, a switched reluctance motor system was constructed to obtain voltage fluctuation data. Subsequently, aiming for voltage stabilization, a control algorithm for SRMG under constant speed mode was designed using the fuzzy PID controller, adopting a dual closed-loop control strategy for speed and current. Finally, compared with conventional PID control, the fuzzy PID controller was shown to effectively improve response speed, reduce voltage overshoot, and decrease voltage fluctuation time, demonstrating superior voltage stabilization performance. © 2024 The Institute of Electrical Engineers of Japan.

关键词： Three term control systems

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Interaction Quantification of MTDC Systems Connected with Weak AC Grids

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CSEE Journal of Power and Energy Systems 2024年第5期10卷 2088-2099页

作者： Wanning Zheng Jiabing Hu Li Chai Bing Liu Zixia Sang Engineering Research Center of Metallurgical Automation and Measurement Technology Wuhan University of Science and TechnologyWuhan 430081China State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China College of Control Science and Engineering Zhejiang UniversityHangzhou 310027China State Grid Hubei Economic Research Institute Wuhan 430077China

The small-signal stability of multi-terminal high voltage direct current(HVDC)systems has become one of the vital issues in modern power *** among voltage source converters(VSCs)have a significant impact on the stability of the *** paper proposes an interaction quantification method based on the self-/en-stabilizing coefficients of the general N-terminal HVDC system with a weak AC network ***,we derive the explicit formulae of self-/en-stabilizing coefficients for any N-terminal HVDC system,which can quantify the interactions through different paths *** relation between the self-/en-stabilizing coefficients and the poles of the system can be used to evaluate the impact of the interactions on the system stability ***,we employ the obtained formulae to analyze the parameter sensitivity and explain how a parameter affects the stability of the system through different paths of ***,extensive examples are given to demonstrate the effectiveness of the proposed method.

关键词： Interactions multi-terminal HVDC self-/enstabilizing coefficients small-signal stability

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Study of Fringe Field Transformations of Short Permanent Magnet Quadrupole Focusing Lens

Study of Fringe Field Transformations of Short Permanent Mag...

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2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： Zhang, Zhenyi Zhou, Zijian Huang, Jiang School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798331530174

Quadrupole magnet is an important element in the beam transport and manipulation. Permanent magnet quadrupole (PMQ) lenses appear frequently in various beamline attributed to their compact structure. In this paper, a method applicable to the fringing field transformation of a short permanent magnet quadrupole lens is proposed. The large electron beam envelope error, which occurs during the focusing process of short PMQ lenses, has been addressed. This achieved by replacing sharp cut-off fringing field with multi-rectangle cut-off fringing field. The causes of fringe field transformation errors are investigated by theoretical calculations of beam dynamics. The law of magnetic field gradient curve change of a short PMQ lens is analyzed. The scale parameters in the multi-rectangle approximation method are optimized by multi-particle tracking and finite element simulation. Applying the method to PMQ lenses of varying mechanical lengths confirms the feasibility and universality of the multi-rectangle approximation method for PMQ fringe field transformation. © 2024 IEEE.

关键词： Permanent magnets

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Numerical study of current density on armature and rail interface with dynamic contact 10

Numerical study of current density on armature and rail inte...

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10th Euro-Asian Pulsed Power Conference, 25th International Conference on High-Power Particle Beams and 20th International Symposium on electromagnetic Launch technology, EAPPC-BEAMS-EML 2024

作者： Xu, Jinghan Xia, Shengguo Chen, Lixue Huazhong University of Science and Technology Key Laboratory of Pulsed Power Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9789038661353

The electrical contact between the armature and rail is acknowledged as an imperfect electrical contact (ImPEC), exhibiting properties distinct from the bulk. It is necessary to understand the current distribution for future structure design and optimization. This paper proposes ImPEC boundary conditions by combining the contact layer model (CLM) and the Cooper-Mikic-Yoranovich model (CMYM), and the current distribution is numerically studied. The contact pressure and area vary with the input current, sharing similar trends, which show a rapid increase in the contact pressure and area during the current ramp-up stage, being constant in the flat stage, and a gradual decline in the current ramp-down stage. The current is re-distributed with the contact area, which is concluded as forced shifts of current caused by dynamic contact. © 2024 Eindhoven University of technology.

关键词： Digital elevation model

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Interfacial modulation of nano Li_(7)La_(3)Zr_(2)O_(12) composite electrolytes prepared by solvent-free method

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Green Energy & Environment 2025年第3期10卷 528-536页

作者： Qigao Han Yaqing Guo Fuhe Wang Xuechun Lou Fengqian Wang Jun Zhong Jinqiao Du Jie Tian Weixin Zhang Shun Tang Shijie Cheng Yuancheng Cao Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan430074China Shenzhen Power Supply Co.Ltd. Shenzhen518001China

Solid-state batteries(SSBs) with high safety are promising for the energy fields,but the development has long been limited by machinability and interfacial ***,self-supporting,flexible Nano LLZO CSEs are prepared with a solvent-free method at 25℃.The 99.8 wt% contents of Nano LLZO particles enable the Nano LLZO CSEs to maintain good thermal stability while exhibiting a wide electrochemical window of 5.0 V and a high Li~+ transfer number of *** mean modulus reaches 4376 *** from the interfacial modulation,the Li|Li symmetric batteries based on the Nano LLZO CSEs show benign stability with lithium at the current densities of 0.1 mA cm^(-2),0.2 mA cm^(-2),and 0.5 mA cm^(-2).In addition,the Li|LiFePO_(4)(LFP) SSBs achieve favorable cycling performance:the specific capacity reaches128.1 mAh g^(-1) at 0.5 C rate,with a capacity retention of about 80% after 600 *** the further tests of the LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811) cathodes with higher energy density,the Nano LLZO CSEs also demonstrate good compatibility:the specific capacities of NCM811-based SSBs reach 177.9 mAh g^(-1) at 0.5 C rate,while the capacity retention is over 96% after 150 ***,the Li|LFP soft-pack SSBs verify the safety characteristics and the potential for application,which have a desirable prospect.

关键词： Solvent-free method Nano LLZO CSEs Interfacial modulation Cycling performance Safety characteristics

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Design and experimental study of a field-reversed configuration plasma thruster prototype

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Plasma Science and technology 2025年第3期27卷 118-126页

作者： Yuxuan HUANG Ming ZHANG Yong YANG Fangwei LYU Xiaopeng YI Chaofan LYU Yisong ZHANG Bo RAO State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma PhysicsSchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China National Key Laboratory of Science and Technology on Vacuum Technology and Physics Lanzhou Institute of PhysicsLanzhou 730000People’s Republic of China

The field-reversed configuration(FRC)plasma thruster driven by rotating magnetic field(RMF),abbreviated as the RMF-FRC thruster,is a new type of electric propulsion technology that is expected to accelerate the deep space *** experimental prototype,including diagnostic devices,was designed and constructed based on the principles of the RMF-FRC thruster,with an RMF frequency of 210 kHz and a maximum peak current of 2 *** the rated operating conditions,the initial plasma density was measured to be 5×10^(17)m^(-3),and increased to 2.2×10^(19)m^(-3)after the action of *** coupling efficiency of RMF was about 53%,and the plasma current reached 1.9 *** axial magnetic field changed in reverse by 155 Gauss,successfully reversing the bias magnetic field of 60 Gauss,which verifies the formation of FRC *** optimization research,it was found that when the bias magnetic field is 100 Gauss,the axial magnetic field reverse variation caused by FRC is the highest at 164 *** experimental results are discussed and strategies are proposed to improve the performance of the prototype.

关键词： rotating magnetic field(RMF) field-reversed configuration(FRC) plasma thrusters plasma current

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Influence of 3D helical magnetic perturbations on runaway electron generation in J-TEXT tokamak

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Plasma Science and technology 2025年第3期27卷 36-44页

作者： Wei YAN Guinan ZOU Zhongyong CHEN You LI Jiangang FANG Zhifang LIN Zhonghe JIANG Nengchao WANG Bo RAO Yangbo LI Zhengkang REN Chuanxu ZHAO Yu ZHONG Fanxi LIU Yinlong YU Zisen NIE Xun ZHOU Yuan SHENG Yuwei SUN Song ZHOU Xiaoqing ZHANG Zhoujun YANG Zhipeng CHEN Yonghua DING the J-TEXT Team State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma PhysicsSchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China School of Electrical Engineering&Automation Jiangsu Normal UniversityXuzhou 221116People’s Republic of China 不详

A large number of runaway electrons(REs)generated during disruption can cause significant damage to next-generation large-scale *** influence of three-dimensional(3D)helical magnetic perturbations on the suppression of RE generation was explored using a set of 3D helical coils in J-TEXT tokamak,which can excite m/n=-2/2 helical magnetic *** evidence shows that the-2/2 magnetic perturbations caused by the opposite coil current direct plasma toward the high-field side,simultaneously enhancing the magnetic fluctuations,which would enhance the radial loss of REs and even prevent RE *** the other hand,-2/2 magnetic perturbations can also reduce the cooling time during the disruption phase and generate a population of high-energy REs,which can interact with high-frequency magnetic fluctuations and in turn suppress RE *** critical helical coil current was found to correlate with electron density,requiring higher coil currents at higher *** to the statistical analysis of RE generation at different electron densities,the applied-2/2 magnetic perturbations can increase the magnetic fluctuations to the same level at lower electron densities,which can decrease the threshold electron density for RE *** will be beneficial for RE mitigation in future large tokamak devices.

关键词： 3D helical magnetic perturbations runaway electron J-TEXT tokamak

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Efficient direction-independent fog harvesting using a corona discharge device with a multi-electrode structure

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Plasma Science and technology 2022年第9期24卷 98-107页

作者： Dingchen LI Chuan LI Jiawei LI Wendi YANG Menghan XIAO Ming ZHANG Yong YANG Kexun YU International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China

Efflcient collection of water from fog can effectively alleviate the problem of water shortages in foggy but water-scarce areas,such as deserts,islands and so *** inefflcient fog meshes,corona discharge can charge water droplets and further enhance the water-collecting *** study proposes a novel multi-electrode collecting structure that can achieve efflcient and direction-independent water collection from *** multi-electrode structure consists of three parts:a charging electrode,an intercepting electrode and a ground *** types of watercollecting structures are compared experimentally,and the collection rates from a traditional fog mesh,a wire-mesh electrode with fog coming from a high-voltage electrode,a wire-mesh electrode with fog coming from a ground electrode and a multi-electrode structure are 2–3 g h^(-1),100–120 g h^(-1),60–80 g h^(-1)and 200–220 g h^(-1),*** collection rate of the multielectrode structure is 100–150 times that of a traditional fog mesh and 2–4 times that of a wiremesh *** results demonstrate the superiority of the multi-electrode structure in fog *** addition,the motion equation of charged droplets in an electric fleld is also derived,and the optimization strategy of electrode spacing is also *** structure can be applied not only to fog collection,but also to air puriflcation,factory waste gas treatment and other flelds.

关键词： fog collection corona discharge wire-mesh electrode multi-electrode structure collection rate

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