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Power System and Green Energy Conference (PSGEC)

作者： Xiong Xie Hao Yin Xiao Yang Weiyu Wang Dayi Li Jiaxin Xu Jing Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

To deal with the icing of overhead lines caused by frequent ice disasters, this subject proposes a new uninterruptible electric ice-melting technology for distribution network. The deicing device is composed of adjustable reactor and earthing transformer. The head end of the device is connected to the substation power supply through a transformer, and the end is short-circuited with one-phase line in the ice- covered section through a ground wire to form a zero-sequence circuit, so as to provide zero-sequence current to the line to be deiced online to make the line heat up and melt the ice to achieve deicing without power outage. After the article puts forward this scheme, the model was built in Maxwell 3D software for verification, and the ice melting test is carried out on the pilot line, which proves the feasibility of this scheme.

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Static Hysteresis Process Modeling Based on Modified Tellinen Hysteresis Model

Static Hysteresis Process Modeling Based on Modified Telline...

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China International Electrical and Energy Conference (CIEEC)

作者： Yubo Zhang Dezhi Chen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Modeling the process of the static magnetic hysteresis accurately is essential to compute the magnetic fields of electrical devices and components, and a modified static hysteresis model based on Tellinen hysteresis model is presented and verified in this paper. Only two measured ascending curves are needed to solve this static model, rather than the limiting loop, which is friendly to measuring device. By comparing the measured static hysteresis curves with the calculated static hysteresis curves, it is found that the static model shows good efficiency and accuracy, and the error caused by Tellinen hysteresis model itself could be negligible when the two measured curves the model demands are close to the curve to be computed.

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Operation Strategy of Cryogenic System for High-Temperature Superconducting Cable Based on The Recommended Interval

Operation Strategy of Cryogenic System for High-Temperature ...

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International Conference on Applied Superconductivity and electromagnetic Devices, ASEMD

作者： Guilun Chen Li Ren Ying Xu Feiyang Long Jiajie Wu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

High temperature superconducting (HTS) cables will suffer from performance degradation at high operating temperatures, and in severe cases even quench. The cryogenic system is able to effectively regulate the temperature distribution of the HTS cable by setting the operating parameters in a reasonable range to ensure its performance. It is therefore necessary to investigate operation strategy for cryogenic system that take the temperature distribution along the cable into account. In this paper, the specific requirements for the safe operation of HTS cable system with regard to the operating parameters of cryogenic system are analyzed. An operation strategy for cryogenic system is proposed to achieve thermally stable operation of HTS cable.

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Switch Open-Circuit Faults Diagnosis in Three-Phase PWM Rectifier Based on Phase and Transient Model

Switch Open-Circuit Faults Diagnosis in Three-Phase PWM Rect...

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PELS Students and Young Professionals Symposium (SYPS), IEEE

作者： Zhongdong Lin Li Peng State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Numerous studies have shown that the power switch devices have high fault rate in converters. Aiming at above problem, this paper proposes a switch open-circuit faults (SOCF) diagnosis method in three-phase pulse-width modulation (PWM) voltage source rectifier (VSR). The diagnosis algorithm is based on phase information from the phase-locked loop (PLL) and line voltage deviations calculated by the transient model. The proposed method can accurately and rapidly diagnose all kinds of single and double SOCF, without extra hardware. Finally, simulations in MATLAB/Simulink verify the robustness and effectiveness of the proposed method.

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Ozone Generation by DC Needle-Needle Discharge at Atmospheric Pressure

Ozone Generation by DC Needle-Needle Discharge at Atmospheri...

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Energy, Power and Electrical engineering (EPEE), International Conference on

作者： Weiyi Wang Mengqi Li Bingkai Wang Zilan Xiong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

In this study, the effect of discharge gap and applied voltage on the ozone generation by DC needle-needle discharge was investigated. The relationship between the production efficiency and the energy cost as well as the generation rate were discussed. It has been found that under all experimental conditions, the ozone concentration increased with processing time, but under the same gap distance, the ozone concentration and generation rate initially increased and then decreased with the increase of the applied voltage and injected energy. The energy cost of ozone generation under the discharge power and the total power were calculated and compared. The energy cost basically increased with the applied voltage and power consumption. Therefore, to obtain the optimal parameters for ozone production, both the energy cost and the generation rate should be considered.

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Influence of the Fluctuating Input on Hydrogen Production by Alkaline Water Electrolysis

Influence of the Fluctuating Input on Hydrogen Production by...

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Sustainable Power and Energy Conference (iSPEC)

作者： Yuheng Ying Hao Li Zhiyao Zhong Danji Huang Kewei Hu Ang Lu Jiakun Fang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Water electrolysis by renewable energy is a popular and promising solution for power-to-hydrogen. Conventional water electrolysis prefers DC voltage which needs converters and filters. However, the fluctuation cannot be completely eliminated and the effect of AC power on electrolyzers may not be entirely negative. In this paper, a multi-physics model for hydrogen production by alkaline water electrolysis has been built. Through the latency of bubble accumulation and the convexity of the I-V curve, it is been proved that the fluctuating input may have a positive effect on the hydrogen production. The transient process of the bubble accumulation has been elaborated. An integrated industrial system for hydrogen production by water electrolysis has been built for experiments. From the results, we conclude that dynamic process of the bubble on the electrode will affect the current dynamic process of the electrolyzer. The fluctuating input promotes the hydrogen production rate and reduces the energy conversion efficiency. In the specific case, a 0.7% loss in efficiency can bring 5.3% generation rate, which may be benefit for the industry.

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electromagnetic Scattering Effect in Gate Driver Circuit of MMC sub-module

Electromagnetic Scattering Effect in Gate Driver Circuit of ...

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International Conference on Power Electronics and Motion Control (IPEMC)

作者： Yuyao Yan Han Peng Qiaozhi Yue Shijie Song Manbo Wang Xinyue Lv Yidong Zhao State Key Laboratory of Advanced Electromagnetic Technology (AET) School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798350351330

ISBN: (纸本)9798350351347

With the rapid development of flexible DC technology, the reliability requirements for flexible DC transmission are increasingly high. The converter valve, as a key device in flexible DC transmission projects, plays a crucial role in ensuring their normal operation. Since the failure of converter valves is mainly due to the malfunction of the gate driver circuit, ensuring the normal operation of the gate driver circuit is vital. However, traditional methods of calculating the electromagnetic field on the gate driver circuit often overlook the impact of the gate driver circuit itself, which will lead to a mis-estimation of magnetic field on gate driver circuit. In this paper, the electromagnetic radiation generated by IGBTs is firstly calculated using dipole model. The distribution current generated by the surface wire of the gate driver circuit is calculated by the electromagnetic scattering theorem. On this basis, the distributed current generated on the surface of the gate driver circuit is calculated. A more accurate spatial electromagnetic calculation method is summarized. And the correctness of the method is verified in simulation and experiment.

关键词： Insulated gate bipolar transistors Accuracy electromagnetic scattering electromagnetic radiation Gate drivers Valves Wire

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Synthetic optimization and application of Li-argyrodite Li6PS5I in solid-state battery at different temperatures

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Rare Metals 2022年第3期41卷 798-805页

作者： Zhen-Yuan He Zi-Qi Zhang Ming Yu Chuang Yu Hao-Tian Ren Jun-Zhao Zhang Lin-Feng Peng Long Zhang Shi-Jie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China Wuhan National High Magnetic Field Center and School of Physics Huazhong University of Science and TechnologyWuhan 430074China School of Physics Huazhong University of Science and TechnologyWuhan 430074China

Lithium argyrodite electrolytes (Li_(6)PS_(5)X (X=Cl, Br, I))have received tremendous attention due to their low cost and high conductivity among sulfide electrolytes. However,the synthesis details and application of ... 详细信息

关键词： battery application optimization

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Assessment of Transition by FBG Strain Measurement of Rails in EM Launchers 17th

Assessment of Transition by FBG Strain Measurement of Rails ...

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Xu, Jinghan Xia, Shengguo Wu, Pengfei Yang, Hongdan Ministry of Education Hubei Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronics Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China Wuhan Energy Conservation Monitoring Center Hubei Wuhan430074 China

ISBN: (纸本)9789819904075

electromagnetic launch is a new type of technology characterized by high current, high magnetic field, and strong interaction inside the system. The extreme condition may lead to transition which causes damage to the bore. In this paper, experiments at the current ranging from 210 kA to 288 kA are carried out and 3 couples of Fiber Bragg Grating (FBG) are used to measure the strain on both rails. Muzzle voltages are recorded as well to analyze the transition in the launch process. To investigate the influence of the material hardness on the interaction of the armature/rail surface, one couple of the rails applied in experiments are H62 brass with a hardened coating whereas the others are bare H62 brass. The results show that the strain increases with the driving current before the transition and drops significantly when the transition occurs. The strain measurement provides an assessment of transition, combined with the muzzle voltage, it can not only determine when but also estimate where the transition occurs. Moreover, the hardened rail is more easily to cause transition than the conventional one, which means the threshold driving current is lower and the duration is longer. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Fiber Bragg gratings

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Phase transformation and reaction kinetics of BaK122 precursor synthesized via a two-step method

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The European Physical Journal B 2025年第4期98卷 1-9页

作者： Liu, Xinyuan Zhang, Xianping Dong, Chiheng Tang, Minghui Wang, Dongliang Ma, Yanwei Key Laboratory of High Density Electromagnetic Power and Systems (Chinese Academy of Sciences) Institute of Electrical Engineering Chinese Academy of Sciences Beijing China University of Chinese Academy of Sciences Beijing China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Jinan China

122-Type iron-based superconductors have gained considerable interest due to their potential for high-field applications. A two-step method for preparing BaK122 precursor powders is shown to enhance the superconducting performance of wires and tapes. However, impurities pose formidable challenges to enhancing critical current density, while their underlying causes remain an open question. In this work, the phase formation process of the two-step precursors was investigated. After sintering at 550 °C, iron arsenides and KFe2As2 are generated in large quantities. The superconducting properties of the sample improve significantly when the sintering temperature is increased to 700 °C. However, the distribution of K and Ba elements in the 122-phase remains inhomogeneous. For the samples sintered at 850 °C, impurities are almost eliminated, resulting in the formation of high-purity Ba0.6K0.4Fe2As2. The reaction mechanisms for each exothermic process follow the Avrami-Erofeev equation and are expressed as G(α) = [− ln(1-α)]1/n, which corresponds to the nucleation and crystal growth model. Based on the above results, we summarize the phase formation process of the two-step BaK122 precursor and propose a formation mechanism for the impurities. This study provides valuable insights into optimizing the sintering process and improving the purity of BaK122 precursors.

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