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2022 International Conference on Optoelectronic Materials and Devices, ICOMD 2022

作者： Qiao, Jian Guo, Jingrun Peng, Shuhao You, Junnan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781510663268

For the large generators with different branch winding potential overlap, the existing stator ground fault location methods are difficult to determine the faulty branch. Therefore, this paper presents a novel fault location method based on the flexible optical current transformer. Based on the Faraday magneto-optical effect principle, the optical fiber reflection reciprocal interference technology is used to detect the rotation angle. The flexible optical current transformer is used to measure the equivalent zero-sequence current of each generator branch, and then the dynamic time warping distance (DTW) algorithm is used to compare the similarity of each zero-sequence current, to identify the correct faulty branch and achieve accurate grounding fault location. The simulation results verify the effectiveness of the proposed method, and the results are still reliable and sensitive when the transition resistance is 500 Ω. © 2023 SPIE.

关键词： Location

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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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2023 IEEE Sustainable Power and Energy Conference, iSPEC 2023

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

ISBN: (纸本)9798350322699

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. © 2023 IEEE.

关键词： bubbles power-to-hydrogen (PtH) voltage fluctuation water electrolysis

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Investigation of False Data Injection Attacks: A Simulation Implementation and Classical Countermeasure Perspective

Investigation of False Data Injection Attacks: A Simulation ...

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2023 Panda Forum on Power and Energy, PandaFPE 2023

作者： Wang, Ziyu Wang, Jingyu Shi, Dongyuan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350321173

state Estimation (SE) is used to derive accurate operating states from redundant field measurements, wherein Bad Data Detection (BDD) is used to eliminate measurement outliers. In the past decade, False Data Injection (FDI) attacks have attracted extensive attention, as they provide a strategy to introduce bias to SE results by maliciously modifying measurements in a way that can bypass BDD. Regrettably, although FDI attacks are plausible in math, whether they are feasible in practice has not been paid enough attention. This paper tries to give an answer by formulating three FDI attack vectors, each exploiting the vulnerability of a different communication protocol to achieve background reconnaissance and data tampering. Based on the proposed attack vectors, the path of launching FDI attacks in a concrete cyber environment and the corresponding defense countermeasures are analyzed through cyber-physical co-simulation. Case studies demonstrate that applying classical countermeasures, such as cryptographic techniques and access control policies, can effectively frustrate FDI attacks in the real world. Futhermore, it can be summarized from the experiments that attackers may leverage side-effects of defense countermeasures to mount more subtle attacks. It is essential to consider defending against cyber-physical attacks from an overall perspective in the future. © 2023 IEEE.

关键词： state estimation

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Low-Frequency Passivity Characterization of Grid-Forming Inverter 2

Low-Frequency Passivity Characterization of Grid-Forming Inv...

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2nd IEEE International Power Electronics and Application Symposium, PEAS 2023

作者： Guan, Jingying Li, Shaojie Lin, Hua Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350313765

This paper focuses on the system stability of grid-forming (GFM) control through passivity criterion. An accuracy small-signal impedance model under dq-frame is established, which is used to analyze the influence of controller coefficients on system stability by passivity theory. And the inherent characterization for the risk of low-frequency resonance is revealed, indicating that its non-passivity region always exists, regardless of controller coefficients and specific control schemes. Finally, the theoretical analysis is verified by simulation results and the experiment test. © 2023 IEEE.

关键词： Grid-forming inverter low-frequency resonance passivity criterion system stability

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Different Temperature Distributions During the Formation of Cathode Spot Crater in Vacuum Arcs 7

Different Temperature Distributions During the Formation of ...

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7th IEEE Conference on Energy Internet and Energy System Integration, EI2 2023

作者： Ye, Jingjing Yuan, Zhao Yang, Peixuan Chen, Lixue Liu, Liming Pan, Yuan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350345094

The 2D axisymmetric model of crater with flowable heat transfer is combined with the mass, momentum, and heat transfer equations. However, it is considered that the initial cold cathode surface does not have current density. Under the new simulation condition of electric field, two typical distributions of temperature are obtained for different external parameters. At higher pressure relative to the heating efficiency, a distribution of temperature on droplet head much higher than the central area is formed. When the heating efficiency is large enough, the temperature of central area increases continuously, resulting in the same temperature as the metal droplet head. © 2023 IEEE.

关键词： Temperature distribution

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A Pre-disaster Optimal Maintenance Strategy for Distribution Networks to Confront Severe Convective Weather Considering Post-disaster Situations

A Pre-disaster Optimal Maintenance Strategy for Distribution...

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

作者： Yao, Fuxing Miao, Shihong Wang, Tingtao Wang, Jiaxu Wang, Baisheng Tan, Haoyu 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 increasingly frequent severe convective weather poses a serious threat to the reliability of distribution networks. In this regard, an optimal maintenance model that considers pre-disaster defense and post-disaster mitigation stages is proposed to meet the demand for resilience enhancement. During the pre-disaster defense stage, the equipment maintenance plan and the corresponding operation strategy are decided in conjunction with the failure probability of each device. During the post-disaster mitigation stage, the emergency dispatch strategy of the grid is developed considering the diversity of damage results. On these bases, the optimal pre-disaster maintenance strategy considering post-disaster situations is identified by integrating the two stages' outage losses and operating costs. Finally, the numerical results show that the proposed strategy can give an optimal maintenance plan by combining the fragility of each device, which effectively improves the outage prevention and management capability of the distribution network under severe convective weather. © 2024 IEEE.

关键词： Operating costs

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Tuning Solid Interfaces via Varying Electrolyte Distributions Enables High-Performance Solid-state Batteries

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Energy & Environmental Materials 2023年第2期6卷 26-33页

作者： Linfeng Peng Chuang Yu Ziqi Zhang Ruonan Xu Mengjun Sun Long Zhang Shijie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430000China School of Physics Huazhong University of Science and TechnologyWuhan 430000China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China School of Materials Science and Engineering Huazhong University of Science and TechnologyWuhan 430000China

Solid/solid interface is the major challenge for high-performance solid-state *** electrolytes(SEs)play a crucial role in the fabrication of effective interfaces in solid-state ***,the electrolyte distribution with varied particle sizes is tuned to construct solid-state batteries with excellent performance at different operating ***-state batteries with the configuration S/L(small-sized SE in composite cathode and large-sized SE in electrolyte layer)show the best performance at room temperature(168 mA h g^(−1) at 0.2 C,retention of 99%,100 cycles)and−20°C(89 mA h g^(−1) at 0.05 C),while the configuration S/S displays better performance at elevated *** superior performance of S/L battery is associated with faster lithium-ion dynamics due to the better solid/solid interface between active materials and ***,the inferior performance at 60℃is caused by the formation of voids and cracks in the electrolyte layer during *** contrast,the S/S battery delivers superior performance at elevated operating temperature because of the integrated *** work confirms that tailoring electrolyte size has significant effect on fabricating all-climate solid-state batteries.

关键词： electrochemical performance lithium argyrodite operating temperature size distribution solid-state batteries

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A novel seal-flow multi-vortex friction stir lap welding of metal to polymer matrix composites

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Chinese Journal of Aeronautics 2024年第1期37卷 451-462页

作者： Shuaiqiang NIAN Mingshen LI Shude JI Wei HU Zhiqing ZHANG Zelin SUN College of Aerospace Engineering Shenyang Aerospace UniversityShenyang 110136China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

The friction stir lap welding(FSLW)of metal to polymer is a challenging work due to the unavoidable polymer *** this problem,a novel seal-flow multi-vortex friction stir lap welding(SM-FSLW)technology based on the subversively-designed multi-step pin was put *** 7075 aluminum alloy and short glass fiber-reinforced polyether ether ketone(PEEK)as research subjects,the welding temperature,material flow,formation and tensile shear strength of dissimilar materials lap joint under the SM-FSLW were studied and compared with those under traditional FSLW based on the conical *** multi-step pin rather than the conical pin effectively hindered the polymer overflowing due to the formation of vortexes by the step,thereby attaining a joint with a smooth *** with traditional FSLW,the SMFSLW obtained the higher welding temperature,the more violent material flow and the larger area with high flow velocity,thereby producing the macro-mechanical and micro-mechanical interlockings and then heightening the joint loading *** tensile shear strength of lap joint under SM-FSLW was 27.8% higher than that under traditional *** SM-FSLW technology using the multi-step pin provides an effective way on obtaining a heterogeneous lap joint of metal to polymer with the excellent formation and high strength.

关键词： Friction stir lap welding Metal to polymer Multi-step pin Material flow Tensile shear strength

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A Fast Analytical Dose Calculation Approach Based on RAMDIM in MR-Guided Proton Therapy 4

A Fast Analytical Dose Calculation Approach Based on RAMDIM ...

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

作者： Chen, Songbin Tan, Ping Xiong, Haimin 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

In magnetic resonance-guided proton therapy, protons are deflected in magnetic fields, resulting in distortion of the dose distribution. In dose calculation, Monte Carlo simulation methods are highly accurate but time-consuming. Clinical dose validation requires a fast and accurate method to calculate the dose distribution. In this paper, a fast analytical dose calculation approach is proposed based on Raytracing Algorithm for Magnetic Deflection of Ions in Media. Different energies, different magnetic field strengths and different energy spreads are considered, and the γ-pass rates in all cases exceeds 98%. © 2024 IEEE.

关键词： Proton beam therapy

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Exploring a new path of green and efficient utilization of sinter return fine to produce composite pellets

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Journal of Iron and Steel Research International 2024年第7期31卷 1610-1622页

作者： Yan-biao Chen Wen-guo Liu Hao Guo Jing-song Wang Qing-guo Xue Hai-bin Zuo State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China MCC Capital Engineering and Research Incorporation Limited Beijing 100176China

Efficient utilization of sinter return fine is an important measure to reduce cost,increase efficiency,save energy and reduce emission.A new path of green and efficient utilization of return fine was proposed to produce composite *** metallurgical properties of composite pellets under the condition of hydrogen-rich blast furnace were *** experimental results indicate that the coated concentrate was consolidated for the composite pellets through normal Fe_(2)O_(3) *** the surface of core return fine,the liquid phase formed due to its low-melting point,assimilated the adjacent concentrate,and then consolidated with the temperature *** with regular pellets,the com-pressive strength and reduction swelling index of composite pellets were decreased,but the reducibility index and softening-melting properties were *** addition,the reduction degradation index of composite pellets was sig-nificantly higher than that of ***,adding composite pellets was conducive to indirect reduction in blast furnace,reducing fuel ratio and improving production *** to the effect of the roasting system on the metallurgical properties,the roasting temperature and time were determined as 1250℃and 30 min,*** composite pellets can be produced under the traditional pelletizing process.

关键词： Sinter Return fine Composite pellet Roasting system Metallurgical property Hydrogen-rich blast furnace

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