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

作者： Liming Zhong Yanqi Hu Xiude Tu Yongqian Xiong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665400657

The compact terahertz free electron laser light source requires high quality of electron beam. For the long time the beam tuning tasks were done by operators manually, however it is challenging for operators to obtain ideal beam quality. Automatic beam tuning methods using optimization algorithms are required. Therefore a software framework, the sequential decision-making framework, has been developed so as to utilize existing tuning methods and newly emerged intelligent control techniques in the accelerator control community. The framework can serve as a platform for the development, test and demonstration of different control algorithms. It can also support normal tasks like automatic emittance measurement and remnant magnetism removal of quadrupoles. Since the completion of the framework, the efficiency of the laboratory operations has been greatly improved.

关键词： Software algorithms Measurement by laser beam Control systems Software Laser beams Laser tuning Task analysis

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Species dependence of the impurity injection induced poloidal flow and magnetic island rotation in a tokamak

arXiv

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arXiv 2023年

作者： Zeng, Shiyong Zhu, Ping Ren, Haijun Department of Engineering and Applied Physics University of Science and Technology of China Anhui Hefei230026 China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China Department of Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States

Recent experiments have demonstrated the species dependence of the impurity poloidal drift direction along with the magnetic island rotation in the poloidal plane. Our resistive MHD simulations have reproduced such a dependence of the impurity poloidal flow, which is found mainly determined by a local plasmoid formation due to the impurity injection. The synchronized magnetic island rotation is dominantly driven by the electromagnetic torque produced by the impurity radiation primarily through the modification to the axisymmetric components of current density. © 2023, CC BY-NC-SA.

关键词： Magnetoplasma

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Transient and Steady-State Response of AlGaN/GaN Terahertz Detectors under Sinusoidal Excitation of Different Intensities

Transient and Steady-State Response of AlGaN/GaN Terahertz D...

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International Conference on Infrared and Millimeter Waves

作者： Huiting Xia Zhengya Yin Shanshan Jia Lei Cao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Terahertz field effect transistors (TeraFETs) based on AlGaN/GaN materials have high responsivity and sensitivity at room temperature. Based on the hydrodynamic equations, the nonlinear voltage response (transient and steady-state) of this type of THz detector was numerically calculated by finite difference method under THz excitation with different frequencies and intensities. Comparisons with the existing analytical formula and the analysis of the influence of viscosity coefficient on the response were also presented.

关键词： Viscosity Temperature sensors Sensitivity Detectors Voltage Mathematical models Wide band gap semiconductors

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Enhanced Radiolysis Performance and Mineralization of Ciprofloxacin by Ionizing Radiation Combined with G-C3n4/Cds

SSRN

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SSRN 2022年

作者： Ye, Qi Zhu, Yi Yang, Miao Zhao, Long State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology Wuhan430074 China

In this study, the degradation of ciprofloxacin (CIP) was investigated in the synergetic system of electron beam irradiation (EBI) combined with graphite carbon nitride / carbon nanodots (g-C 3 N 4 /CDs). The results suggested that the presence of g-C 3 N 4 /CDs could not only promote the degradation of CIP but also significantly enhanced the mineralization ratio. At 25 kGy, the mineralization ratio increased from 18.1% to 69.0% while g-C 3 N 4 /CDs was added. Regeneration experiments revealed that the g-C 3 N 4 /CDs composite possessed good reusability. In addition to finding that the presence of CO 3 2- , HCO 3 - , NO 3 - and NO 2 - obviously restrained the radiolysis process of CIP, the adding of Cl - and SO 4 2- could also have slight inhibitory effects. The effect of various water matrices in EBI&g-C 3 N 4 /CDs systems suggested that the degradation efficiency decreased in lake and tap water. Moreover, the studies in the presence of different radical scavengers suggested that ·OH was the main reactive species in the degradation process. The possible degradation pathway of CIP was proposed in the light of intermediate products using Liquid chromatograph-mass spectrometer (LC–MS) analysis coupled with DFT calculations. © 2022, The Authors. All rights reserved.

关键词： Radiolysis

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Dual-Side Three-stage Asymmetric Phase Shift Strategy for Bidirectional Inductive Power Transfer System with SiC Power Module

Dual-Side Three-stage Asymmetric Phase Shift Strategy for Bi...

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

作者： Haowen Chen Changsong Chen Mengjie Jiang Shuran Jia Xuezheng Huang The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665448178

Power exchange between vehicle and grid by bidirectional inductive power transfer (BIPT) system. This paper proposes a dual-side three-stage asymmetrical phase shift (TAPS) control strategy to achieve a high transmission efficiency with zero voltage switching (ZVS) in a wide range of load. With the proposed dual-side TAPS strategy, asymmetrically adjust the amplitude of the ac fundamental excitation voltage with three adjacent control periods as a waveform period. A wide ZVS range and a high system power factor can be realized simultaneously. In addition, when the load is light, the number of switching actions is significantly reduced. The control scheme for the full bridge of both sides is presented, which realizes both optimization of transmission efficiency and zero-voltage switching operation for all power switches. Simulation are performed to compare the effects of triple-phase-shift (TPS) strategy and proposed TAPS strategy on the transmission efficiency, which shows that the system with proposed TAPS control strategy realizes a higher transmission efficiency in a wide range of load.

关键词： Reactive power Silicon carbide Photonic band gap Asia Switches Zero voltage switching Control systems

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Origin and Elimination of Excess Iron Particles in Off-Stoichiometric Ba 0.6K 0.5-βFe 2As 2 δ Superconductors

SSRN

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SSRN 2023年

作者： Tu, Chang Dong, Chiheng Fu, Caida Han, Meng Tang, Minghui Huang, He Yao, Chao Wang, Dongliang Zhang, Xianping Ma, Yanwei Key Laboratory of Applied Superconductivity Institute of Electrical Engineering Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu Zhongke Jinan250013 China

Iron impurities frequently observed in BaxK1-xFe2As2 wires and tapes not only cause local suppression of superconductivity but also act as macro-obstacles to transport current. We find that the agglomerated iron particles are not introduced by external sources or caused by incomplete reactions but result from the chemical environments determined by nominal compositions. The excess K added to the raw materials for compensating the evaporated K consumes the stoichiometric arsenic and induces unreacted iron. Decreasing the K content indeed removes the redundant Fe but also deteriorates superconductivity. Instead, slightly over-adding As is proved to be a twin-track approach to fabricate high-performance superconductors. Through modulation of the nominal composition Ba0.6K0.5-βFe2As2+δ, we effectively eliminate the iron impurities and improve the transport critical current density of the tape to Jc(4.2 K, 10 T)=9.59×104 A/cm2. A reaction model is proposed to explain the formation mechanism of the iron particles. © 2023, The Authors. All rights reserved.

关键词： Iron-based Superconductors

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An Optimal Winding-end Connection Principle with Minimum Bridge Current Stress for Odd-Phase Series-end Winding Topology

An Optimal Winding-end Connection Principle with Minimum Bri...

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European Conference on Power Electronics and Applications

作者： Xiangwen Sun Zicheng Liu Zhiyuan Wang Jilan Huang An Li Dong Jiang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

The multiphase series-end winding motor drive receives attention due to its low cost, complete control freedoms and abundant winding connection selections. Different winding series combination will cause huge performance diversity in voltage utilization or bridge current stress. The most widely used solutions now possess excellent voltage utilization, but the same high current stress will limit its application that are more sensitive to current. This paper proposes an optimal winding connection sequence to get the theoretically lowest bridge current stress of odd-phase series-end winding topology. Experiment results verify the feasibility of proposed winding connection methods.

关键词： Motor drives Phase modulation Windings Bridge circuits Europe Optical wavelength conversion Power electronics

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Unveiling Bidding Uncertainties in Electricity Markets: A Bayesian Deep Learning Framework Based On Accurate Variational Inference

SSRN

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SSRN 2022年

作者： Wu, Shengyang Ding, Zhaohao Wang, Jingyu Shi, Dongyuan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Hubei Wuhan430074 China School of Electrical and Electronic Engineering of North China Electric Power University Beijing China

With the ever-increasing level of bidding freedom bestowed to participants in deregulated electricity markets, bidding strategies have become more complicated, inevitably giving rise to the growth of market uncertainties. Despite the rich literatures on Bidding Behavior Forecasting (BBF), there remains a gap in enhancing the performance of probabilistic BBF and understanding the sources of bidding uncertainties in electricity markets. This paper proposes a holistic Bayesian Deep Learning (BDL) framework based on Accurate Variational Inference (AVI) to bridge the gap. The introduced framework first modifies the traditional Bayesian Neural Network (BNN) by introducing the parameter-selective Rényi's α-divergence to realize AVI. The ameliorated algorithm procures higher BBF accuracy. Afterwards, the proposed framework captures both aleatoric and epistemic uncertainty, two major uncertainties in deep learning that represent the uncertainties within bidding behaviors and within the proposed BBF model, respectively. A new metric called uncertainty contribution to evaluate the potential influencing factors' impact on the bidding uncertainties is then brought up. Using the proposed metric, we ascertain the prominent origin of bidding behavior uncertainty and propose realistic explanations to support the theory. Finally, numerical experiments are carried out utilizing historic data in Australia to demonstrate the performance of the proposed framework. © 2022, The Authors. All rights reserved.

关键词： Uncertainty analysis

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Wideband Refractive Index Extraction of Low-loss Materials with the Combined TDS-FTIR Method

Wideband Refractive Index Extraction of Low-loss Materials w...

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International Conference on Infrared and Millimeter Waves

作者： Lei Cao Shanshan Jia Huiting Xia Zhengya Yin State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

A method to obtain the optical constants of low loss materials in a wide frequency range was proposed based on the measured transmission data from THz-TDS and FTIR. With anchoring phase points from TDS, the phase spectrum lost in FTIR original data was successfully retrieved and the complex refractive index was acquired with standard iterative method (Nelder-Mead and Newton-Raphson). As an example, the refractive index and extinction coefficient of HRSi were extracted from 0.5 to 10 THz with both iterative method and analytic formula. Good agreement between TDS and FTIR results in the overlapped frequency range was realized.

关键词： Refractive index Propagation losses Optical variables control Loss measurement Optical materials Frequency measurement Iterative methods

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A Compact 175°C High Temperature Gate Driver with Isolated Power Supply and advanced Protection for HybridPACK Drive SiC Module

A Compact 175°C High Temperature Gate Driver with Isolated ...

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

作者： Cheng Qian Neng Wang Yayong Yang Zhiqiang Jack Wang Yong Kang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665448178

The operation of silicon carbide (SiC) power semiconductor devices under high ambient temperature requires high temperature gate drivers adjacent to the devices. This paper presents a three-phase isolated gate driver circuit suitable for HybridPACK Drive (HP Drive) power modules with operating ambient temperature up to 175°C. First, an overall introduction of the gate driver structure and layout design method for reducing thermal coupling are presented. Second, detailed designs are presented in the form of sub-circuits such as desaturation protection circuit, isolated power supply, active Miller clamp, undervoltage lockout and so on. Finally, the proposed gate driver design is validated through double pulse test, continuous full-load operation under 145°C and continuous light-load test under 175°C. Comprehensive performance evaluation of proposed high temperature gate driver is presented.

关键词： Couplings Power supplies Silicon carbide Photonic band gap Design methodology Layout Asia

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