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1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Xiong, Liangli Liu, Yi Lin, Fuchang Pan, Yuan Huazhong University of Science and Technology School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9781728196596

Electrohydraulic discharge shock wave (EHS) is a new technology of underwater discharge application, which is used to crack the rock mass. At present, when the rock mass is under static pressure, the cracking characteristics of the rock mass with repetitive EHSs are still unclear. In this paper, the static pressure environment is simulated by the particle flow numerical simulation software, and the numerical model of the rock fractured by EHS is established. Studies have shown that static pressure can inhibit the formation and development of microcracks. The higher the static pressure, the more cycles of EHS are needed to achieve the same microcrack density, or the discharge energy of EHS needs to be boosted. In terms of spatial distribution, the increase in static pressure will inhibit the development of the number and depth of the main fractures. Finally, this article discusses the relationship between crack density, static pressure, discharge energy and the number of actions of EHS. © 2020 IEEE.

关键词： Shock waves

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An Improved Approach Based on Transformer Network for Remaining Useful Life of Lithium-ion Battery

An Improved Approach Based on Transformer Network for Remain...

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Power and Electrical engineering (ACPEE), 5th Asia Conference on

作者： Jilong Mao Xin Yin Rui Chen Kai Ding Lin Jiang Jinmu Lai Xianggen Yin State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China The Department of Electrical Engineering and Electronics University of Liverpool Liverpool U.K. CYG SUNRI CO. LTD. Shenzhen China School of Electrical and Information Engineering Zhengzhou University Zhengzhou China

In the midst of a growing energy crisis, lithium batteries are attracting attention from various countries. With the massive use of lithium batteries in energy storage systems, accurately predicting the health status of lithium batteries has become a key issue. In battery management systems, predicting battery life is an important part, but it is difficult for current RNN-based neural networks to learn dependencies between distant positions, resulting in reduced accuracy. In this paper, we presented the EMD-Transformer method to achieve accurate prediction of battery life using only a small amount of online battery data. In the data pre-processing process, offline data were added to the dataset. Then EMD was used to extract lifetime degradation trends as well as capacity regeneration information. The Transformer model was used to get prediction results. Finally, a comprehensive SOH prediction result was generated by integrating all the separate results. Using a few battery lifetime data, we demonstrated that the RMSE of the prediction results is within 3%, which owes a higher accuracy than the existing Transformer and LSTM methods.

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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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Enhanced dynamo drive for the sawtooth relaxation process due to non-uniform resistivity distribution in a reversed field pinch

arXiv

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arXiv 2025年

作者： Yan, Wentan Zhu, Ping Li, Hong Liu, Wandong Luo, Bing Li, Haolong KTX Laboratory Department of Plasma Physics and Fusion Engineering University of Science and Technology of China Anhui Hefei230026 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China Department of Nuclear Engineering and Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States Hunan Province Key Laboratory Integration and Optical Manufacturing Technology College of Mathematics and Physics Hunan University of Arts and Science Hunan Changde415000 China Department of Physics School of Science Tianjin University of Science and Technology Tianjin300457 China

In this work, we use the three-dimensional resistive MHD code NIMROD to investigate the impact of resistivity inhomogeneity on the sawtooth process of an reversed field pinch (RFP) plasma. The simulation employs a non-uniform resistivity profile similar to experiments, which monotonically increases from the core to the edge as the temperature decreases. The resistivity inhomogeneity introduces an additional electric field in the plasma, which accelerates the inward diffusion of magnetic flux and changing the self sustained reversal state, hence significantly enhances the dynamo effect and the sawtooth process in the RFP plasma. Copyright © 2025, The Authors. All rights reserved.

关键词： Electric fields

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Prospects for Power Systems with High Proportion of Renewable Energy Considering the Coordination of Source-grid 14

Prospects for Power Systems with High Proportion of Renewabl...

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14th International Conference on Computer and Electrical engineering, ICCEE 2021

作者： Ling, Xu Yu, Haiyang Wang, Yuan Wu, Yaowu Liang, Shuhao Hu, Zhigang Central China Branch of State Grid Corporation of China Wuhan430074 China China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

In the future, the spatiotemporal distribution of a high proportion of renewable energy will bring unprecedented challenges to power system, and the basic form and operation of power system will have great changes. On the basis of investigating the research status in China and abroad, this paper expounds the scientific problems faced by the planning of Power Systems with High Proportion of Renewable Energy (PSHPRE) considering the coordination of source-grid, and put forward the basic ideas and framework of research from four aspects: overview of the development of PSHPRE, power planning in PSHPRE and coordinated planning of source-grid in PSHPRE. Finally, the prospects for Power Systems with High Proportion of Renewable Energy considering the coordination of source-grid are presented. © Published under licence by IOP Publishing Ltd.

关键词： Renewable energy resources

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Flexible Operation of Solar-Assisted Carbon Capture Power Plants Considering Interval-Enhanced Cvar

SSRN

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SSRN 2024年

作者： Liang, Shuhao Lou, Suhua Zhu, Ziqing Sun, Yongping State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China Hubei Provincial Key Laboratory of Power Safety and Efficiency Huazhong University of Science and Technology Wuhan430074 China Department of Conputer Science The Hong Kong Baptist University Kowloon Tang Hong Kong Institute of State Governance Huazhong University of Science and Technology Wuhan430074 China Center of Hubei Cooperative Innovation for Emissions Trading System Hubei University of Economics Wuhan430205 China

Solar-assisted carbon capture power plants (SACCPPs) leverage solar thermal energy to mitigate power output loss and expand the net output range of carbon capture units, enhancing energy economy, reserve capacity, and carbon emission reduction. However, assessing the flexible operation benefits of SACCPPs in power systems with high wind power penetration is challenging due to complex thermodynamic models and limited risk assessment methods. This study addresses these gaps by proposing an innovative modeling approach and benefits evaluation framework. First, a linear flexible operation model is developed, focusing on the technical features of SACCPPs relevant to power system operation and scheduling. This model elucidates the intercoordination in power generation, carbon capture, and thermal storage. The operating ranges of various carbon capture power plants are quantitatively analyzed using a two-dimensional coordinate diagram, highlighting the flexible regulation advantages of SACCPPs. Second, an interval-enhanced CVaR method is introduced, which considers random variables with unknown probability distributions, refining the current CVaR-based knowledge. This method is used for a quantified risk assessment to evaluate supply-demand imbalance risks in power systems, providing a foundation for assessing SACCPPs' risk mitigation benefits. Third, a risk-aware operation scheduling model is developed to explore SACCPPs' capability in enhancing the system's energy economic benefits, risk mitigation, and carbon emissions reduction. This model aids energy administration in evaluating system gains from SACCPPs and in developing rational system-wide planning and retrofit projects. Finally, numerical simulation and sensitivity analysis results on the modified IEEE-39 bus system validate the robust adaptability and effectiveness of the proposed models and methods. © 2024, The Authors. All rights reserved.

关键词： Wind power

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Transient Stability Analysis of the Standalone System Constructed by Paralleled Grid-Forming Converters under Symmetrical Short-Circuit Fault

Transient Stability Analysis of the Standalone System Constr...

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Smart Power & Internet Energy Systems (SPIES), International Conference on

作者： Jiayan Zhang Xinchun Lin Guangzhou Huang Huiqiang Sun Dan Liu Kezheng Jiang Huazhong University of Science and Technology Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology State Grid Hubei Electric Power Co. LTD Electric Power Research Institute Wuhan China

With the rapid development of renewable energy, the micro grid and standalone system are greatly penetrated by grid-forming converters which establish the voltage and frequency of the system. The grid-forming converter like the synchronous generator may threaten the standalone system safe and stable operation under large disturbances. Based on that, this paper investigates the transient stability of the standalone system constructed by two paralleled grid-forming converters suffering from symmetrical short-circuit fault. Firstly, the transient model of the standalone system is established. Secondly, based on state-space equations, the transient stable boundary is derived to analyze the impact of circuit parameters and control parameters on the transient stability of the system, which guides the parameter optimization. Furthermore, the optimal selection method of control parameters of grid-forming converters is proposed to improve the transient stability. At last, the effectiveness of analytical results is verified by simulations.

关键词： Power system stability Stability analysis Mathematical models Synchronous generators Circuit stability Circuit faults Transient analysis

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Cathodic Zn underpotential deposition:an evitable degradation mechanism in aqueous zinc-ion batteries

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Science Bulletin 2022年第18期67卷 1882-1889,M0004页

作者： Shaohua Zhu Yuhang Dai Jinghao Li Chumei Ye Wanhai Zhou Ruohan Yu Xiaobin Liao Jiantao Li Wei Zhang Wei Zong Ruwei Chen Guanjie He Dongliang Chao Qinyou An State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materialsand School of Chemistry and MaterialsFudan UniversityShanghai 200433China Christopher Ingold Laboratory Department of ChemistryUniversity College LondonLondon WC1H 0AJUK Electrochemical Innovation Laboratory Department of Chemical EngineeringUniversity College LondonLondon WC1E 7JEUK State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Department of Materials Science and Metallurgy University of CambridgeCambridge CB30FSUK

Aqueous zinc-ion batteries(AZIBs)are promising for large-scale energy storage,but their development is plagued by inadequate cycle ***,for the first time,we reveal an unusual phenomenon of cathodic underpotential deposition(UPD)of Zn,which is highly irreversible and considered the origin of the inferior cycling stability of *** experimental and theoretical simulation approaches,we propose that the UPD process agrees with a two-dimensional nucleation and growth model,following a thermodynamically feasible ***,the universality of Zn UPD is identified in systems,including VO_(2)//Zn,TiO_(2)//Zn,and SnO_(2)//*** practice,we propose and successfully implement removing cathodic Zn UPD and substantially mitigate the degradation of the battery by controlling the end-ofdischarge *** work provides new insights into AZIBs degradation and brings the cathodic UPD behavior of rechargeable batteries into the limelight.

关键词： Underpotential deposition Zn metal deposition Zinc-ion battery Aqueous battery Degradation mechanism

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Facilely Fabricating V2o3@C Nanosheets Grown on Rgo as High-Performance Negative Material for Lithium-Ion Batteries by Adjusting Surface Tension

SSRN

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SSRN 2022年

作者： Zhang, Dan Zhang, Chunyan Zhao, Yizhuo Zheng, Xuan Shi, Xinyu Yan, Mengmeng Li, Yuzhu Liu, Guangyin Liu, Xiaodi Yu, Chuang College of Chemistry and Pharmaceutical Engineering Nanyang Normal University Nanyang473061 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China

The flourish of insertion reaction type V 2 O 3 negative materials with large reversible capacity and outstanding rate performance is facing a huge trouble. In the study, we have successfully prepared V 2 O 3 @C/rGO composite by adjusting surface tension. The small V 2 O 3 @C nanosheets are fastened to reduced graphene oxide, which remarkably elevates electrons and lithium ions transfer rate. More importantly, the obvious interaction between V 2 O 3 and reduced graphene oxide is beneficial for faster charge transfer. The above features of V 2 O 3 @C/rGO composite are responsible for obtaining larger reversible capacity and superior rate capability. When applied to lithium-ion batteries as a negative material, it delivers a large reversible discharge capacity of 754 mA h g -1 at 100th cycle under 100 mA g -1 . Though under 2000 mA g -1 , V 2 O 3 @C/rGO still can give a large capacity of 409 mA h g -1 . This study would bring a novel light on the preparation of 2D materials and the efficient application of insertion reaction type materials. © 2022, The Authors. All rights reserved.

关键词： Surface tension

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Simulation of the positive streamer propagation in SF6/N2 mixtures with different content of SF6 7

Simulation of the positive streamer propagation in SF6/N2 mi...

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7th IEEE International Conference on High Voltage engineering and Application, ICHVE 2020

作者： Luo, Bin He, Henxing Cheng, Chen Wu, Yutong Huang, Yubin Chen, Weijiang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China State Grid Corporation of China Beijing China

ISBN: (纸本)9781728155111

SF6/N2 gas mixture is considered as a practical alternative proposal of SF6 in GIL and GIS. Simulating the positive streamer propagations in different SF6/N2 mixtures assists in the optimization of SF6 ratio in SF6/N2 mixtures and the insulation design of GIL and GIS. This paper presents a fluid dynamic model for the positive streamer propagation in SF6/N2 mixtures. Based on this model, the positive streamer propagations in a 1 mm needle-plate gap in SF6/N2 mixtures with three different content of SF6 are simulated. Through the comparison of space net charge and chemical reaction rate, it is noted that there exists a negative space charge region in the streamer channel. With the increase of the ratio of SF6, the attachment of SF6 will be reinforced, thereby accelerating the accumulation of the negative space charge in the streamer channel. The increased negative space charge inhibits the ionization activity at the streamer head and leads to the increase of the critical ambient field sustaining the continuous propagation of the positive streamer. In SF6/N2 mixtures with high SF6 content, the decrease rate of the ionization activity at the streamer head may overwhelm the increase rate of the attachment rate in the streamer channel, indicating that the cease of the ionization activity is more likely to result in streamer decay in the SF6 mixtures with high SF6 content. © 2020 IEEE.

关键词： Sulfur hexafluoride

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