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

作者： Yuanhao Zhong Changsong Chen Bowen Cui Chenxi Bai Taihang He The State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331530174

ISBN: (纸本)9798331530181

Due to the good weak grid adaptability and grid support capability, Grid-Forming (GFM) energy storage converter is considered to be an effective solution for the grid-connected interface of new power systems. When a symmetrical low-voltage fault occurring, grid-forming converters may face transient overcurrent problems during the fault and recovery phases. A virtual synchronous generator (VSG)-controlled GFM converter is take as the research object in this paper and a low-voltage ride-through (LVRT) control method of GFM converter is proposed, which realizes the current limitation of GFM converter under low-voltage fault by using adaptive virtual impedance. On the basis of guaranteeing the voltage source characteristics of GFM converter, L VRT control method injects reactive current into the grid according to standards. Finally, based on the Simulink/Matlab simulation platform, the effectiveness of L VRT control method for transient current suppression is verified.

关键词： Low voltage Reactive power Power system stability Synchronous generators Impedance Transient analysis Voltage control Standards Grid forming Fault currents

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Application of three-dimensional MHD equilibrium calculation coupled with plasma response to island divertor experiments on J-TEXT

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Plasma Science and technology 2024年第11期26卷 71-86页

作者： Wei XIE Yunfeng LIANG Zhonghe JIANG Yasuhiro SUZUKI Li LI Jiankun HUA Jie HUANG Alexander KNIEPS Song ZHOU Feiyue MAO Xin XU Keze LI Yutong YANG Ziyang JIN Cunkai LI 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 Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung-PlasmaphysikPartner of the Trilateral Euregio Cluster(TEC)Jülich 52425Germany Graduate School of Advanced Science and Engineering Hiroshima UniversityHigashi-Hiroshima 739-8527Japan College of Science Donghua UniversityShanghai 201620People’s Republic of China Southwestern Institute of Physics Chengdu 610041People’s Republic of China 不详

Three-dimensional(3D) equilibrium calculations, including the plasma rotation shielding effect to resonant magnetic perturbations(RMPs) produced by the island divertor(ID) coils, were carried out using the HINT and MARS-F codes on J-TEXT. Validation of 3D equilibrium calculations with experimental observations demonstrates that the shielding effect will prevent the penetration of the edge m/n = 3/1 mode component when the ID coil current is 4 k A, while change the size of magnetic islands once the current exceeds the penetration threshold. This indicates that equilibrium calculations including the plasma rotation shielding effect to RMPs can lead to better agreements with experimental observations compared to the vacuum approximation method. Additionally, the magnetic topology at the boundary undergoes changes,impacting the interaction between the plasma and the target plate. These results may be important in understanding RMP effects on edge transport and magnetohydrodynamic(MHD)instability control, as well as divertor heat and particle flux distribution control.

关键词： magnetic topology resonant magnetic perturbation 3D equilibrium shielding effect

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Particle Simulation of Near-Cathode Sheath in Vacuum Arc 17th

Particle Simulation of Near-Cathode Sheath in Vacuum Arc

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Shi, Qilin Yang, Peixuan Ye, Jingjing Liu, Xueliang Jiang, Wei Yuan, Zhao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Hubei Wuhan430074 China Key Laboratory of Pulsed Power Technology Ministry of Education Huazhong University of Science and Technology Hubei Wuhan430074 China School of Physics Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819903566

The melting evaporation and thermal field emission of the cathode during the interrupting of the vacuum circuit breaker maintain the burning of the vacuum arc and form a near-cathode sheath. A one-dimensional implicit particle cloud/Monte Carlo (PIC/MCC) model is established, and the behavior of macroparticles is tracked to obtain the overall distribution of the plasma. The field information is obtained by solving the Poisson equation to push the particles, and the collision between particles is ignored. The simulation area is divided into three sub-domains: quasi-neutral area, transition area, and sheath area, and the particles moving to the boundaries will be removed. The relationship between sheath thickness, plasma density, and electron temperature is obtained by simulation. When the plasma density is between 1017m−3−1023m−3 and the electron temperature between 1−5eV, the numerical simulation results are in good agreement with the analytical formulas, which verifies the correctness of the PIC model. The effect of the applied transverse magnetic field on the development of the sheath in a vacuum arc is also investigated. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Plasma density

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A high energy density hybrid EMI filter based on improved MCMC

A high energy density hybrid EMI filter based on improved MC...

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China Power Supply Society electromagnetic Compatibility Conference (CPEMC)

作者： Shuo Li Junzhao Zhang Dong Jiang Zicheng Liu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronics Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331509552

ISBN: (纸本)9798331509569

This paper proposes an improved Multi-Function Common Mode Choke (MCMC), and designs a high energy density hybrid EMI filter (HEF). MCMC improves the suppression effect and energy density of the filter by using the Current Transformer (CT) of the active EMI filter (AEF) as the common mode inductor in the passive EMI filter (PEF). By adding inductance to the secondary side of the CT, the improved MCMC strengthens the effective working bandwidth. And the HEF with the improved MCMC, compared to the one with the original MCMC, has significantly better noise suppression effects at both low-frequency and peak noise points, and it also has slight improvements at high frequencies. It is especially suitable for tasks that require higher filter bandwidth.

关键词： Current transformers Power supplies Passive filters electromagnetic interference Noise Prototypes Bandwidth Active filters High frequency Inductors

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Analysis of Discharge Characteristics and Parameter Influence of Pulsed Power Supply for Electrothermal Chemical Shotguns

Analysis of Discharge Characteristics and Parameter Influenc...

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

作者： Chenxu Fu Kexun Yu Xianfei Xie The State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331530174

ISBN: (纸本)9798331530181

The discharge current waveform of the pulse power supply(PPS) has a direct relationship with the characteristics of the discharge load. The load of the electrothermal chemical cannon is mainly a plasma generator, which involves many complex physical processes in the discharge emission process. However, at present, fixed resistance is generally used to simulate the load for discharge, so it is impossible to accurately study the discharge characteristics of pulsed power supply to electrothermal chemical cannon. Therefore, a 560KJ PPS is initially designed in this paper, and the mathematical model of the pulse power supply and plasma generator load is established. Combined with the internal ballistic model of the electrothermal chemical gun, the model is discretized by the fourth-order Runge-Kutta method, and the corresponding discharge current, discharge output energy and projectile velocity curves are calculated and drawn. Based on the established mathematical model of pulse power supply for electrothermic chemical shotguns, the effects of different parameters of PPS on discharge performance are analyzed, which provides a reference for the optimization of discharge parameters of PPS.

关键词： Resistance Voltage measurement Projectiles Capacitors Discharges (electric) Mathematical models Plasmas Integrated circuit modeling Chemicals Load modeling

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A Multi-Unit Bidirectional Inductive Power Transfer System With Power-Synchronization Controlled Subunits

A Multi-Unit Bidirectional Inductive Power Transfer System W...

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

作者： Lin Gan Changsong Chen Shuran Jia Bowen Cui Xiayan Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331530174

ISBN: (纸本)9798331530181

A multi-unit bidirectional inductive power transfer (BIPT) system is suitable as a wireless energy trading platform for electric vehicles (EVs). Phase synchronization technique is required to implement flexible power flow pattern of such system. Traditional method utilizes dedicated synchronization module, which will increase the complexity and the cost of system. This article proposed a multi-unit BIPT system with power-synchronization controlled subunits. The resemblance between the multi-unit BIPT system and the traditional power grid dominated by synchronous machines is revealed. A power-synchronization method is proposed for the multi-unit BIPT system, which can significantly reduce the complexity and the cost of system because neither extra coils nor extra high-speed, high-precision detection and conditioning circuits are required. Experimental verification is carried out to verify the grid-to-vehicle (G2V) and vehicle-to-grid (V2G) capability of the multi-unit BIPT system and the effectiveness of the proposed power-synchronization method.

关键词： Wireless communication Coils Vehicle-to-grid Costs Control systems Power grids Complexity theory Synchronization Synchronous machines Load flow

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Adaptive state-of-Charge Control Strategy for Hybrid Energy Storage System Based on Grid-Forming Converter

Adaptive State-of-Charge Control Strategy for Hybrid Energy ...

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

作者： Bowen Cui Changsong Chen Lin Gan Xiayan Li Yuanhao Zhong State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331530174

ISBN: (纸本)9798331530181

At present, Grid-Forming (GFM) control is recognized as the most promising control technology for grid-connected converters. The energy the GFM converters provide for grid frequency support is mainly sourced from energy storage (ES). Hybrid Energy Storage (HES) systems have the potential to combine the advantages of different types of ES, thereby enhancing the frequency response and inertia emulation capabilities. Nevertheless, ES may encounter state-of-Charge (SOC) limit issues in practice. This paper focuses on the control of the HES system based on GFM converter (GFM-HES). An adaptive SOC control strategy is proposed. On the one hand, closed-loop control of the Supercapacitor terminal voltage is employed to achieve fast SOC recovery. On the other hand, adaptive SOC control for the battery is adopted to prevent it from entering the overcharge and over-discharge zone. The simulation results verify the effectiveness of the proposed control strategy.

关键词： Hands Simulation Power control Supercapacitors Frequency conversion Power grids state of charge Voltage control Frequency control Grid forming

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Effect of dilution gas composition on the evolution of graphite electrode characteristics in the spark gap switch

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Plasma Science and technology 2021年第6期23卷 74-82页

作者： Hongyu DAI Lee LI Shuai REN Jingrun GUO Xin GONG Anthony Bruce MURPHY State Key Laboratory of Advanced Electromagnetic Engineering and Technology Key Laboratory of Pulsed Power Technology(Ministry of Education)School of Electrical and Electronic EngineeringHuazhong University of Science&TechnologyWuhan 430074People's Republic of China CSIRO Manufacturing Lindfield NSW 2070Australia

As the widely implemented electrode material,graphite has the characteristic of sublimation by the thermal shock of the switching arc,and the produced carbon vapor is easy to condense into carbon powders and deposit in the *** impact of the type of dilution gas in a mixture of20%oxygen and 80%dilution gas on the sublimation and oxidation characteristics of the graphite electrode is *** is found that when nitrogen dilution gas was replaced by argon,the heat flux to the electrodes decreased,which led to a 63%reduction of graphite *** the same time,the cooling rate of the arc was slower in argon,which promotes oxidation of the carbon *** residual solid carbon can be reduced by 70%–85%by using argon as the dilution ***,it is demonstrated that the stability and working life of the switch could be increased by appropriate selection of the dilution gas.

关键词： pulsed discharge graphite electrode thermal arc dilution gas electrode erosion

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Effect of the relative phase between pre-existing 2/1 and 3/1 magnetic islands on the suppression of runaway electrons on J-TEXT

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Chinese Physics B 2023年第7期32卷 71-77页

作者：熊金玉江中和焦子啸李振梁云峰陈忠勇丁永华 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 430074China Yangtze Memory Technologies Co. Ltd.Wuhan 430074China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China Forschungszentrum J¨ulich GmbH Institut f¨ur Energie-und Klimaforschung-PlasmaphysikJ¨ulich 52425Germany

In the experiments of actively triggering plasma disruption by massive gas injection, the externally applied resonant magnetic perturbation has been used to mitigate the hazard of runaway electron(RE). Motivated by the experiment of multimode coupling to suppress REs on J-TEXT, some typical simulation cases with non-ideal MHD with rotation-open discussion(NIMROD) code are carried out to explore the influential mechanism of different relative phases between m/n =2/1 and m/n = 3/1 magnetic islands on the confinement of REs. Results show that the RE confinement is drastically affected by the relative phase between 2/1 and 3/1 magnetic islands. When the O point phase of 2/1 and 3/1 magnetic islands is toroidal 330°, REs can be effectively lost. The fitting curve of the remaining ratio of REs vs. the relative toroidal phase is predicted to approximate a sine-like function dependence. Further studies indicate that the phase difference between coexisting 2/1 and 3/1 islands can affect the radial transport of impurities. The loss of runaway electrons is closely related to the deposition effect of impurity. The impurity is easier to spread into the core region with smaller poloidal phase difference between the radial velocity of impurity and the impurity quantity of Ar.

关键词： major disruption runaway electron massive gas injection(MGI) resonant magnetic perturbation(RMP)

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Analysis of cesium distribution for negative ion sources: SID diagnosis and Monte-Carlo simulation

Analysis of cesium distribution for negative ion sources: SI...

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IEEE International Conference on Plasma Science (ICOPS)

作者： F. Xue C. Zuo D. Li D. Chen State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798350360912

ISBN: (纸本)9798350360929

Cesium evaporation is commonly adopted in negative ion sources to form appropriate cesium coverage on the converter surface which lowers surface work function, thus improving negative ion production. The surface coverage of cesium is influenced by oven evaporation rate (controlled by the oven heating temperature) and wall sticking coefficient (influenced by the wall temperature). To investigate cesium transportation in chamber and to optimize cesium condition for future cesium injection in the HUST negative ion source, experiments are carried out in the cesium test stand with surface ionization detector (SID), including the oven SID and two movable SIDs along axis and radius direction, under adjusted oven temperatures and wall temperatures, to simulate the actual working conditions in negative ion sources. A Monte-Carlo model is established to carry out analysis, providing the relationship of cesium distribution and wall sticking coefficient under certain oven evaporation rates. With the oven evaporation rate obtained based on the oven SID, the wall sticking coefficient under various wall temperatures is acquired by comparing the experimental results of movable SIDs with simulation. The results show the relationship between cesium distribution under different oven evaporation rates and wall temperatures, along with wall sticking coefficients calculated.

关键词： Temperature distribution Monte Carlo methods Ovens Transportation Production Ion sources Cesium

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