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

作者： Xiong, Haimin Tan, Ping Chen, Songbin 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

The beam position and size are critical for the safety of the proton therapy system. In view of the distortion of data collected by the ionization chamber during radiating, the possible physical process of noise generation is analyzed and a denoising method based on double Gaussian fitting is proposed for beam profiling in this paper. To investigate the effect of air scattering on the distortion of measured data, we performed the simulation analysis of the process after the proton beam enters the ionization chamber using Garfield++. It was found that the double Gaussian denoising method has obvious advantages over the simple single Gaussian fitting. © 2024 IEEE.

关键词： Ionization chambers

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Magnet and Tracking Analysis of Quadrupole Scanning Method for Emittance Measurement

Magnet and Tracking Analysis of Quadrupole Scanning Method f...

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

作者： Zeng, Yifeng Wang, Yan Hu, Hao Lu, Di Liu, Kaifeng Hu, Tongning 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

Since transverse emittance serves as a critical parameter for evaluating the performance of an electron-beam injector, accurate emittance measurement directly affects the engineering realization of not only the injector but also the entire accelerator-based facility involved. Based on the typical beam injector developed at Huazhong University of Science and technology (HUST injector), the quadrupole magnet scanning (Q-scanning) method is employed for emittance measurement. Suitable selections are made for the existing devices within the beamline, which reduce the measurement errors associated with emittance. An analysis is conducted on the selected quadrupole magnets (Q-magnets), along with an examination of the impact of fringe fields on emittance measurements, including the effects of different edge field conditions and the direct representation of fringe fields in the transfer matrix. The analysis results clearly demonstrate the importance of device selection in the Q-scanning method and the direct effects of fringe fields on various aspects. © 2024 IEEE.

关键词： Accelerator magnets

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Development of electromagnetic pellet injector for disruption mitigation of tokamak plasma

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Chinese Physics B 2023年第7期32卷 29-36页

作者：李峰陈忠勇夏胜国严伟张维康唐俊辉李由钟昱方建港刘凡溪邹癸南喻寅龙聂子森江中和王能超丁永华潘垣 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 Key Laboratory of Pulsed Power Technology Ministry of Education Huazhong University of Science and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Disruption remains to be a serious threat to large tokamaks like the International Thermonuclear Experimental Reactor(ITER).The injection speed of disruption mitigation systems(DMS)driven by high pressure gas is limited by the sound speed of the propellant *** extrapolating to ITER-like tokamaks,long overall reaction duration and shallow penetration depth due to low injection speed make it stricter for plasma control system to predict the impending *** disruptions with a short warning time may be ***,a fast time response and high injection speed DMS is essential for large scale *** electromagnetic pellet-injection(EMPI)system is a novel massive material injection system aiming to provide rapid and effective disruption *** on the railgun concept,EMPI can accelerate the payload to over 1000 m/s and shorten the overall reaction time to a few *** verify the injection ability and stability of the EMPI,the prototype injector EMPI-1 has been designed and *** preliminary test has been carried out using a 5.9 g armature to propel a dummy pellet and the results suggest that the EMPI configuration has a great potential to be the DMS of the large scale fusion devices.

关键词： tokamak disruption mitigation system electromagnetic pellet-injection(EMPI)

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A Stability-Oriented Current Scheme for a Wind Farm Connected to a MMC-HVDC under Severe Faults 8

A Stability-Oriented Current Scheme for a Wind Farm Connecte...

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8th Asia Conference on Power and Electrical engineering, ACPEE 2023

作者： Li, Fuqi Lin, Lei Shi, Xiaojie Li, Yingbiao Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350345520

The offshore wind farm connected modular multilevel converter (MMC)-based high-voltage direct-current (HVDC) transmission system is prone to lose transient synchronization stability under AC faults. The multi-wind turbine (WT) interaction can cause a great deal WTs to lose stability in quick succession. Moreover, the multiple WTs further interact with the control of MMC, making the system stability analysis complicated. In order to guarantee a reliable operation of the system, based on equal area criterion (EAC), this paper exhaustively analyzes the stability problem of such offshore wind farm. The investigated wind farm is made up of full-scale type-4 wind turbines (WTs). It is found that the injected current distribution of MMC and WT are especially predominant in such two interactions. Based on above analysis, a stability-oriented current scheme is proposed to minimize the adverse effect of interactions, enhancing the synchronization stability. Finally, above theoretical analysis and effectiveness of the proposed current scheme are verified by MATLAB/Simulink simulation results. © 2023 IEEE.

关键词： Phase locked loops

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Magnetic Field Effects on Water Electrolysis Performance on a Microfluidic Platform

Magnetic Field Effects on Water Electrolysis Performance on ...

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2023 IEEE Sustainable Power and Energy Conference, iSPEC 2023

作者： Li, Hao Lu, Ang Dong, Tianshu Huang, Danji Song, Chaolong Wen, Jinyu Fang, Jiakun Pan, Yuan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9798350322699

With the rapid development of global low-carbon energy, water electrolysis for hydrogen production attracts significant attention as a crucial energy conversion method. For industrial electrolysis setups, the large-scale application is limited by the issue of low efficiency. To address this issue, one promising approach is to regulate the electrolysis process by imposing an external magnetic field. However, current relevant studies usually focus on static electrolysis systems within beaker-like containers, ignoring the narrow flow channel structure and the circulating flow of electrolyte in industrial electrolyzers. Therefore, an electrolyzer using a microfluidic platform as a phantom is established. Based on the platform, this paper investigates the effects of magnetic field under different magnetic flux densities, electrolysis voltages and electrolyte flow rates. The results indicate that the magnetic field contributes to an enhancement in current density and the increase in current density shows a trend of first increasing and then decreasing with the increase of voltage or flow rate within a certain range. Moreover, The improvement increases with the increment in magnetic flux density. © 2023 IEEE.

关键词： Hydrogen Magnetic field Microfluidic system Water electrolysis

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Scenario Generation of Renewable Energy Based on Improved Diffusion Model

Scenario Generation of Renewable Energy Based on Improved Di...

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2023 IEEE Sustainable Power and Energy Conference, iSPEC 2023

作者： Li, Sheng Xu, Chuanyu Wei, Lishen Li, Ruijie Ai, Xiaomeng State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9798350322699

The large-scale integration of renewable energy into the power system has resulted in increased complexity of its uncertainty. This complexity arises from the rapidly increased renewable energy sites and the intricate spatial-temporal correlations involved. To offer a more precise description of the uncertainty of renewable energy, a scenario generation method based on an improved diffusion model is proposed. This approach can autonomously learn the probability distribution and spatiotemporal correlation of the training data. It utilizes a U-Net model to progressively denoise noise and iteratively generate renewable energy scenarios. Experiments using historical power data from five wind farms and five PV plants in Jiangsu Province show that the training process of the proposed method is more stable compared to existing methods. Moreover, the proposed method achieves higher accuracy in fitting probability distribution and captures the spatial correlation between multiple sites more accurately. © 2023 IEEE.

关键词： diffusion Model renewable energy scenario generation unsupervised learning

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Modified APC Strategy for Doubly Salient Electro-Magnetic Generator with Controlled Rectifier Considering Dramatic Load Changes 8

Modified APC Strategy for Doubly Salient Electro-Magnetic Ge...

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8th International Conference on Power and Renewable Energy, ICPRE 2023

作者： Lei, Zhenyu Wang, Shuanghong Li, Zixin Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350328813

The output voltage of the traditional diode-rectified doubly salient electro-magnetic generator (DSEG) system will change significantly when the load current changes rapidly. Besides, it's difficult to regulate the output voltage by adjusting the field current because of the large time constant. In order to solve the problem, a modified angular position control (APC) strategy based on the controllable rectifier DSEG system is proposed. Using the back propagation neural network (BPNN) to predict proper switching angles according to the speed and field current, the improved APC strategy is helpful to slow down the charge and discharge process of the capacitor and greatly reduced the output voltage fluctuation. Finally, the effectiveness of the proposed strategy is proved by simulations on a 6/4 pole DSEG with controlled rectifier. © 2023 IEEE.

关键词： APC BPNN controlled rectifier DSEG voltage control strategy

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Heat Transfer Simulation and Analysis of Electron Collector Based on Real-time Uniformity Detection Device of Irradiation Accelerator 2

Heat Transfer Simulation and Analysis of Electron Collector ...

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2022 2nd International Conference on Energy, Power and Electrical engineering, EPEE 2022

作者： Zhang, Gefei Yuan, Jushigang Pang, Shiqiang Huang, Jiang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Beam scanning uniformity is an important parameter of electron irradiation accelerators, which affects the quality of irradiated products. Accurate measurements of beam scanning uniformity are required to evaluate accelerator performance. Currently, a set of devices is being developed to measure beam scanning uniformity under full beam conditions. However, the measurement device faces serious heating problems when the beam power is large. In this paper, the cooling structure of the electron collector is designed for the developed measurement device. The temperature distribution of the electron collector is simulated by ANSYS. The appropriate cooling flow rates are selected to ensure the thermal stability of the device when the total beam powers are 30 kW and 50 kW, respectively. The electron collector with a cooling structure is fabricated according to design parameters, and the experiment is carried out under a 1.5 MeV accelerator. The temperature is monitored by an infrared thermometer. The results show that the measured temperature is below the limit. The designed cooling parameters effectively solve the heating problem. © Published under licence by IOP Publishing Ltd.

关键词： Cooling

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Revealing milling durations and sintering temperatures on conductivity and battery performances of Li_(2.25)Zr_(0.75)Fe_(0.25)Cl_(6)electrolyte

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Chinese Chemical Letters 2023年第5期34卷 525-529页

作者： Shuai Chen Chuang Yu Chaochao Wei Linfeng Peng Shijie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Materials Huazhong University of Science and TechnologyWuhan 430074China

Halide electrolytes in solid-state batteries with excellent oxidative stability and high ionic conductivity have been well reported ***,the high-cost rare-earth elements and long duration of highrotation milling procure are the major ***,we have successfully synthesized the low cost Li_(2.25)Zr_(0.75)Fe_(0.25)Cl_(6)electrolyte consisting of abundant elements with comparable Li-ion conductivity in a short milling duration of 4 *** transition of the annealed sample was also carefully *** Ni_(0.6)Co_(0.2)Mn_(0.2)O_(2)/Li_(2.25)Zr_(0.75)Fe_(0.25)Cl_(6)/Li_(5.5)PS_(4.5)Cl_(1.5)/In-Li batteries using different halide electrolytes were constructed and cycled at different voltage ***-state battery using Li_(2.25)Zr_(0.75)Fe_(0.25)Cl_(6)electrolyte obtained from long milling duration delivers higher discharge capacities and superior capacity retention than shorter milling time between 3.0 and 4.3 *** delivers much higher discharge capacity when cycled at elevated temperature(60℃)and suffers fast capacity degradation when the upper cut-off voltage increases to 4.5 V at the same current *** work provides an efficiency synthesis strategy for halide solid electrolyte and studies its applications in all-solid-state batteries in a wide temperature range.

关键词： Solid inorganic electrolyte Solid state battery Halide electrolyte High temperature Synthesis process

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A DC-Link Current Estimation Method for VSI-Fed IPMSM Drive System Considering Dead-Time Effect 26

A DC-Link Current Estimation Method for VSI-Fed IPMSM Drive ...

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26th International Conference on Electrical Machines and Systems, ICEMS 2023

作者： Yuan, Bowen Wang, Shuanghong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350317589

The dc-link current is an important parameter in voltage source inverter (VSI)-fed Interior Permanent Magnet Synchronous Motor (IPMSM) system. On the one hand, the average value of dc-link current reflects the power level of dc-side and plays a crucial part in system protection, power management and efficiency optimization. On the other hand, using estimation method instead of dc-link current sensor to obtain the value of dc-link current can reduce system cost and increase system reliability. However, in practical application, some non-ideal factors such as digital delay, dead time effect and current sampling error caused by low carrier ratio may affect the accuracy of estimation. Therefore, an accurate dc-link current estimation method for VSI-fed IPMSM drive system with space-vector pulse width modulation (SVPWM) is proposed in this paper. Both simulation and experimental results of proposed estimation method are presented to verify the feasibility and accuracy of the proposed estimation method. © 2023 IEEE.

关键词： Permanent magnets

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