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Magnet and Tracking Analysis of Quadrupole Scanning Method for Emittance Measurement

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

引用

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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A Double Gaussian Denoising Method for Beam Profiling in Proton Therapy 4

A Double Gaussian Denoising Method for Beam Profiling in Pro...

引用

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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Star-Connected Modular Auxiliary Resonant Commutated Pole Inverter with Commutation-Aligned PWM Modulation 26

Star-Connected Modular Auxiliary Resonant Commutated Pole In...

引用

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

作者： Ding, Zehuan Gan, Chun Shi, Haochen Ni, Kai Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350317589

This paper proposes a modular auxiliary resonant commutated pole (MARCP) inverter. The MARCP inverter eliminates the need for a connection to the DC bus or midpoint potential and has the same resonant branch for each phase, which enables its modular combination with any phase of inverters. During the operation of the proposed MARCP inverter, resonant currents are constructed in the commutation front through the voltage difference between the three bridge arms, which makes all the bridge arms resonantly commutated at the commutation-aligned moment. After commutation, resonant currents feedback to the power source. All the switches of the MARCP inverter can achieve soft-switching or pseudosoft-switching during the full switching period. In this paper, the effectiveness of the proposed topology and control method is verified by simulation. Compared with the auxiliary resonant commutated pole (ARCP) inverter, the MARCP inverter eliminates the coupling inductor or voltage dividing capacitor, which reduces the device requirement and size of the inverter. Furthermore, the main circuit and resonant circuit of the MARCP inverter are independent of each other, which is convenient for repairing and converting the hard-switching to soft-switching. © 2023 IEEE.

关键词： Pulse width modulation

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An Energy-Communication Network Restoration Strategy under Joint Dispatch of Drone Small Cell and Maintenance Personnel 3

An Energy-Communication Network Restoration Strategy under J...

引用

3rd International Conference on Energy engineering and Power Systems, EEPS 2023

作者： Wang, Tao Huang, Zixin Li, Zhao Zhang, Zhiyu Lin, Xiangning Li, Zhengtian Wei, Fanrong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350313857

Currently, the restoration of energy and communication networks in post-disaster power distribution systems is often considered independently, lacking effective coordination. To address this issue, this paper proposes a post-disaster recovery strategy for the energy-communication network of power distribution systems that involves coordinated scheduling of drone small cell (DSC) and maintenance personnel (MP). Firstly, scheduling models of DSC and MP are established to quantitatively analyze their temporal and spatial characteristics. Then, a post-disaster recovery strategy is proposed for the energy-communication network under the coordinated scheduling of DSC and MP. The energy-communication network is restored with the objective of minimizing the operating costs of the post-disaster power distribution system. The effectiveness of the proposed strategy is verified through numerical simulations based on an improved IEEE 33-node distribution network. © 2023 IEEE.

关键词： Operating costs

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A Denoising Scheme for Core Earth Current of Power Transformers 3

A Denoising Scheme for Core Earth Current of Power Transform...

引用

3rd International Conference on Electrical engineering and Control Science, IC2ECS 2023

作者： Wu, Zhe Li, Zhaohui Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350382426

The core earth current (CEC) is composed of a variety of components, some of which can reflect the health status of power transformers, such as the power frequency and its harmonic components can reflect power transformer core grounding state and core saturation degree, and some pulse components can reflect partial discharge in power transformers. Some high-frequency components can reflect the external shock (very fast transient overvoltage, lighting, etc.) suffered by power transformers. There are also some noise components introduced by ambient environment and measurement system. The existing CEC monitoring devices focus on part of the components, such as the power frequency and its harmonic components or partial discharge pulse component. Both devices are difficult to catch all anomalies in CEC. A current transformer (10Hz-200kHz) is used to sense CEC continuously to catch all abnormal waveforms in CEC. In order to extract the pulse components in CEC, a denoising scheme based on mathematical morphological (MM) filter and wavelet shrinkage is devoted. MM filter can suppress the low frequency component while maintaining the integrity of pulse components. For the purpose of filtering out the white noise in the signal and preserve the complete pulse waveform as much as possible, a new wavelet selection method that the optimum wavelet at each level is selected as the one maximizing the energy ratio of detailed coefficients beside and inside the range formed by the threshold is devoted. Simulated data and field data are used to compare several different wavelet selection methods, and the experimental results show that the pulse distortion extracted by this method is smaller than other methods. © 2023 IEEE.

关键词： core earth current (CEC) mathematical morphology power transformers signal denoising wavelet shrinkage

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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 ...

引用

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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Signature Identification of False Data Injection Attacks Based on Deep Vision Networks

Signature Identification of False Data Injection Attacks Bas...

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

作者： He, Yixuan Wang, Jingyu Shi, Dongyuan 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 increasing integration of cyber-physical systems has markedly amplified the vulnerability of power systems to False Data Injection Attacks (FDIAs), posing significant threats to their security and reliability. FDIAs can emulate various power system dynamics, each with distinct objectives, potentially leading to incorrect decisions by operators or causing damage that may go undetected initially. The impact of these attacks often hinges on their specific signatures, which reflect the temporal characteristics of the injected data waveforms. Therefore, precise classification of these attack signatures is essential for predicting their potential effects and devising effective countermeasures. This paper addresses this challenge by proposing the use of the VGG16 network, a deep learning model commonly utilized in computer vision, to classify the attack signatures. Leveraging VGG16's ability to identify complex patterns in data, the pro-posed method offers a robust solution for distinguishing between different types of FDIAs. Experimental validation on the IEEE 39-bus system confirms the effectiveness of this approach in improving the detection and classification of FDIAs. © 2024 IEEE.

关键词： Cyber attacks

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Scenario Generation of Renewable Energy Based on Improved Diffusion Model

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

引用

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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Magnetic Field Effects on Water Electrolysis Performance on a Microfluidic Platform

Magnetic Field Effects on Water Electrolysis Performance on ...

引用

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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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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