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2020 International Conference on New Energy, power and Environmental engineering, NEPEE 2020

作者： Huang, Qingjun Xing, Guanying Yang, Fan Shu, Weicheng Ma, Jinlong Luo, Xiaobing State Key Lab. of Disaster Prev. and Reduction for Pwr. Grid Transmission and Distribution Equipment State Grid Hunan Electric Power Corporation Disaster Prevention and Reduction Center Changsha410007 China School of Energy and Power Engineering Huazhong University of Science and Technology Wuhan430074 China China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology Wuhan430074 China

Electrically heating garment (EHG) is an effective protection for human in cold environment. In this study, we analysed the principal agents of heat transfer in EHG, and established a theoretical model including heat conduction, natural convection and radiation. To verify the model, the numerical simulations and experiments were compared, and showed a temperature discrepancy smaller than 0.3 C, which was acceptable in engineering design. Using numerical simulation, it is convenient to optimize the design parameters of EHG in different thermal conditions. For instance, to maintain the average temperature of skin within 32-34 C when people are in low metabolic activities, the power of heating elements should range from 73.1-110.7 W/m2 under high heating gear or 10.8-48.5 W/m2 under low heating gear. The more importance is that the calculation allows easy predesign of EHG. The effect of the arrangements of heating elements was studied, herein, the results of six arrangement patterns were presented. It is found that the most effective arrangement can raise the average temperature of skin under heating elements about 0.4-1.2 C than other cases. © Published under licence by IOP Publishing Ltd.

关键词： Thermal comfort

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Ba2+ doping into Ni/Al2O3 nanofibers promotes CO2 methanation via Alkaline modulation

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SSRN 2024年

作者： Zhang, Mengyuan Lu, Xiaoyan Dong, Jiali Luo, Kongliang Ye, Jian Lu, Nana Niu, Qiang Zhang, Pengfei Dai, Sheng State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering College of Chemistry and Chemical Engineering Ningxia University Yinchuan750021 China School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai200240 China National Enterprise Technology Center Inner Mongolia Erdos Electric Power and Metallurgy Group Co Ltd Inner Mongolia Ordos016064 China Chemical Science Division Oak Ridge National Lab. Oak RidgeTN37830 United States

Ni-based catalysts are promising catalysts for CO2 methanation due to low lost. However, the activity and selectivity of Ni-based catalysts in CO2 methanation at low temperatures still need to be improved. Here, Ni4Al2BamOx (m=0-0.5) nanofibers were prepared. Doping Ba2+ would increase alkaline sites and facilitate generating oxygen vacancies. Especially, Ni4Al2Ba0.2Ox exhibited the high specific surface area with 127.1 m2 g-1, being potential for exposing more active sites. Indeed, compared with undoped Ni4Al2Ox catalysts (CO2 conv. = 45%, CH4 select. = 92% at 300°C), Ba2+ doping significantly improved activity (CO2 conv. = 74%, CH4 select. = 99% at 300°C) and stability within 200h for Ni4Al2Ba0.2Ox. Both EPR and O1S XPS confirmed that Ni4Al2Ba0.2Ox can form more oxygen vacancies and CO2-TPD confirmed that Ni4Al2Ba0.2Ox had stronger CO2 adsorption capacity compared to Ni4Al2Ox. In-situ infrared spectroscopy and DFT calculations both indicated that Ba2+ doping can promote generating surface hydroxyl groups and formate pathways. © 2024, The Authors. All rights reserved.

关键词： Carbon dioxide

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Modelling of Short-Term Memory Effect in Electric Double Layer Capacitor with Graphene-based Electrode 4

Modelling of Short-Term Memory Effect in Electric Double Lay...

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4th IEEE International Conference on Energy Internet, ICEI 2020

作者： Ma, Ke Zhang, Ruowei Qin, Boyu Tianjin University of Technology School of Materials Science and Engineering Tianjin300384 China Xi'an Jiaotong University State Key Lab. of Electrical Insulation and Power Equipment and the School of Electrical Engineering Xi'an China

ISBN: (纸本)9780738105000

Electric double layer capacitor (EDLC) has seen widespread applications in energy storage for smooth operation of power systems. However, successful integration of EDLC into energy internet requires comprehensive understanding of its electrical response under various operation conditions. This work employs molecular dynamic simulations to study the physical mechanism behind the short-Term memory effect reported in discharging process of EDLC. The physical meaning of constant phase element for EDLC is also revealed with equivalent circuit of transmission line model of resistors and capacitors. © 2020 IEEE.

关键词： Molecular dynamics

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Effect of O2on Partial Discharge Characteristic of C5F10O/CO2Gas Mixture

Effect of O2on Partial Discharge Characteristic of C5F10O/CO...

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2021 International Conference on Advanced Electrical Equipment and Reliable Operation, AEERO 2021

作者： Xia, Yalong Liu, Fan Wei, Zhuo Zhang, Xiaoxing Han, Pu Xiao, Song Li, Zhen Li, Yi Li, Yalong Research Institute State Grid Sichuan Electric Power Cheng Du China Wuhan University School of Electrical Engineering and Automation Wuhan China Hubei University of Technology Hubei Key Lab. for High-efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Wuhan China

ISBN: (纸本)9781665402644

C5F10O, as a new eco-friendly gas insulating medium with great application potential, has attracted much attention from researchers. There are few studies on the partial discharge (PD) characteristics of C5F10O/CO2O2 gas mixture at present. In this paper, we used needle-plate electrodes to simulate the extremely inhomogeneous electric field caused by the defects of metal protrusions in electrical equipment and tested the partial discharge initial voltage (PDIV) of C5F10O/CO2O2 gas mixture. The effect of oxygen on the partial discharge characteristics of C5F10O gas mixture was revealed. We found that C5F10O gas mixture has an obvious polarity effect, and PDIV+ is always larger than PDIV-. The addition of oxygen reduces the PDIV- and PDIV+ of C5F10O gas mixture and the reduction effect on PDIV+ is more obvious. Therefore, the degrading effect of O2 on the partial discharge characteristics of C5F10O gas mixture should be considered and the proportion of oxygen in C5F10O gas mixture should be strictly controlled. © 2021 IEEE.

关键词： Partial discharges

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Failure Modes and Energy Handling Capability of ZnO Varistors with Different Electrode Edge Margins Stressed by Current Impulses 7

Failure Modes and Energy Handling Capability of ZnO Varistor...

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

作者： Fang, Zhen Wang, Bowen Fu, Zhiyao State Key Lab. of Disaster Prev. Reduction for Power Grid Transmission and Distribution Equipment State Grid Hunan Electric Power Company Disaster Prevention and Reduction Center Changsha China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781728155111

ZnO varistors with different electrode edge margins were tested under 2 ms rectangular impulses and 4/10 µs impulses. A certain margin is necessary to be left between the electrode edge and the edge of the ZnO varistor so that the electrical performance, especially energy handling capability, will not be scattered and limited. Experiments have shown that ZnO varistors with 0.5 mm margin performed better than that with 0 mm, 0.3 mm and 1 mm margins on the whole. During the impulse test, some varistor samples failed. The failure modes under current impulses, including puncture, cracking and flashover were discussed. © 2020 IEEE.

关键词： Electrodes

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Metal Vacancies and Self-Reconstruction of High Entropy Metal Borates to Boost the Oxygen Evolution Reaction

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SSRN 2024年

作者： Zhang, Mengyuan Luo, Kongliang Fan, Yaning Lu, Xiaoyan Ye, Jian Lu, Nana Dong, Jiali Niu, Qiang Zhang, Junjun Zhang, Pengfei Dai, Sheng State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering College of Chemistry and Chemical Engineering Ningxia University Yinchuan750021 China School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai200240 China National enterprise technology center Inner Mongolia Erdos Electric Power and Metallurgy Group Co. Ltd. Inner Mongolia Ordos016064 China Chemical Science Division Oak Ridge National Lab. Oak RidgeTN37830 United States

Exploring highly efficient oxygen evolution reaction (OER) electrocatalysts is important for industrial water electrolysis. Herein, a new high entropy material was reported, i.e., an amorphous high entropy metal borate (CrMnCoNiFe)0.2BOx was synthesized by a new simple solvothermal method. The key of this new synthesis method was to obtain (CrMnCoNiFe)0.2BOx with a high specific surface area (446 m2 g−1) and porous structure, being expected to promote OER reaction. (CrMnCoNiFe)0.2BOx provided a low overpotential of 236 mV at 10 mA cm–2, a reduced Tafel slope of 64 mV dec–1, and good stability. The outstanding OER performance of (CrMnCoNiFe)0.2BOx was attributed to the high entropy structure, generation of metal vacancies, and self-reconstruction during OER. The Cr vacancies generated during the OER process have been demonstrated by Cr 2P XPS and EPR experiments. Various in situ and Ex-situ analyses such as In situ Raman, XPS, and TEM were used to investigate the self-reconstruction of the (CrMnCoNiFe)0.2BOx during the OER. The resulting metal (oxy)hydroxide was believed to be the true active center for OER. The DFT calculation showed the high entropy structure can reduce the adsorption and conversion energy barriers of oxygen-containing intermediates, matching well with the catalytic performance results. This study provided a new simple strategy to construct high entropy metal borate (CrMnCoNiFe)0.2BOx and would inspire the design of high-performance OER catalysts. © 2024, The Authors. All rights reserved.

关键词： Entropy

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Hardware-in-loop simulation of real-time cyber-physical system for DC microgrids

Hardware-in-loop simulation of real-time cyber-physical syst...

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2020 International Exhibition and Conference for power Electronics, Intelligent Motion, Renewable Energy and Energy Management, PCIM Asia 2020

作者： Shi, Tianling Ding, Feng Wang, Fei Ge, Zhen Zhang, Lijun Shanghai Key Lab of Power Station Automation Technology School of Mechatronic Engineering and Automation Shanghai University Bao’shan District Shanghai China Shanghai Marine Equipment Research Institute Shanghai China

ISBN: (纸本)9783800753888

DC microgrids have the advantages of high efficiency, economy, and safety, which can reliably accommodate distributed renewable energy power generation systems, energy storage devices, and DC loads. In order to improve the test accuracy and authenticity of DC microgrids control, a hardware-in-loop (HIL) simulation platform of real-time cyber-physical system (CPS) for DC microgrids based on RT-lab.and lab.IEW is established in this paper. HIL simulation and multiple communication methods are adopted to realize real-time data interaction, and further increase the credibility of the entire model. Moreover, real-time host computer system is designed to realize the data monitoring and visual control. Finally, a case study is illustrated to verify the effectiveness of the proposed simulation platform. © VDE VERLAG GMBH · Berlin · Offenbach.

关键词： Cyber Physical System

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An Advanced Control Strategy for Bidirectional Isolated Three Phase AC/DC Dual-Active-Bridge Converter in Hybrid Microgrid

An Advanced Control Strategy for Bidirectional Isolated Thre...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Dongxin Guo Panbao Wang Jiansheng Kong Jinjie Tian Chunguang Ren Xiangqi Meng Yanbing Jia Yue Qin Zeqi Wang Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China Harbin Institute of Technology Harbin China Datong Power Supply Company State Grid Shanxi Electric Power Company Datong China School of Electrical and Power Engineering Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781665434263

This paper proposes an advanced control strategy consisting of current stress optimization based on triple-phase-shifting (TPS) modulation for front-end DAB converter and 33% PWM method for back-end three-phase full bridge inverter. Compared with the traditional phase shift control, the control strategy proposed for the front-end DAB converter achieves linear control and significantly reduces current stress. In addition, it reduces the DC-Link capacitance, which improves the safety of the equipment. The 33% modulation method adopted by the full bridge inverter at the back-end reduces the switching loss of semiconductor devices. The principle, derivation and realization of the proposed control strategy are described in detail. Simulation results are presented to validate the effectiveness of the proposed strategy.

关键词： Solid modeling Phase modulation Switching frequency Bridge circuits Switching loss System integration Capacitance

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A Polyimide Diaphragm-Based Extrinsic Optical Fiber Fabry-Perot Acoustic Sensor for the Detection of High-Frequency Ultrasonic Signals in Transformer Oil 7

A Polyimide Diaphragm-Based Extrinsic Optical Fiber Fabry-Pe...

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

作者： Qian, Guochao Peng, Qingjun Peng, Hui Wang, Shuchao Zhang, Zhixian Lei, Jiali Electric Power Research Institute Yunnan Power Grid Limited Company Kunming China Yunnan Transformer Electric Limited Company Kunming China State Key Lab. of Transmission Distribution Equipment and Power System Safety and New Technology School of Electrical Engineering Chongqing University Chongqing China

ISBN: (纸本)9781728155111

This article shows an extrinsic optical fiber Fabry-Perot (F-P) acoustic sensor based on a polyimide diaphragm whose effective vibration area and thickness respectively are approximate 4.906 mm2 and 8.5\ \mu \mathrm{m} for the high-quality detection of high-frequency ultrasonic signals in transformer oil. Directional test indicates this proposed sensor is an omnidirectional sensor. And experimental results of the detection for high-frequency ultrasonic signals in transformer oil indicate this proposed sensor has a flat frequency response, which demonstrates this proposed sensor can achieve the high-quality detection for high-frequency ultrasonic signals in transformer oil. Therefore, this proposed sensor also has excellent potential for the detection of partial discharges occurring in transformer oil in any direction. © 2020 IEEE.

关键词： Frequency response

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Proteomic Analysis Based on Lignite Degraded by Fusarium Sp. Nf01

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SSRN 2022年

作者： Niu, Yu Suo, Yonglu Niu, Xian School of Mining and Technology Inner Mongolia University of Technology Inner Mongolia Autonomous Region Hohhot010051 China School of Electric Power Civil Engineering and Architecture Shanxi University Taiyuan030006 China College of Energy Science and Engineering Xi’an University of Science and Technology Shaanxi Xi’an710054 China Key Lab. of University of Geological Hazards and Geotechnical Engineering Defense in Sandy Drought and Cold Regions Inner Mongolia Autonomous Region Hohhot010051 China

The proteome is an extremely important biofunction performer in coal biodegradation. However, studies on this subject are generally scarce. We first analyzed the surface morphology, functional groups , and chemical compositions of lignite biodegradation products using a previously identified fungus ( Fusarium sp. NF01). After 30 days of incubation, 1.8 g of lignite was bioliquefied into 4.7 mL of black droplets that primarily contained 15.56% pentadecanal, 10.33% dodecamethylcyclohexasiloxane, and 7.8% tetradecamethylcyclo-heptasiloxane, accompanied by significant changes in morphological features and functional groups of lignite. Then, Fusarium sp . NF01 secretome was quantitatively and qualitatively analyzed by isobaric tandem mass tags ( TMTs ) and bioinformatics profiling. A total of 18 protein abundances, including 8 upregulated and 10 downregulated proteins (fold change, FC ≥1.2 or FC ≤ 0.83 and P-value ≤0.05), were significantly changed in the lignite-containing medium. Bioinformatics profiling disclosed that Fusarium sp . NF01 adopted a multilevel protein-based strategy to respond to the influence of the lignite environment on its growth and metabolism, with major strategies including nutrient transport and synthesis, positive plasma membrane regulation, immunity optimization, and cell damage and death prevention. These findings will aid further proteomic studies on coal biodegradation. © 2022, The Authors. All rights reserved.

关键词： Biodegradation

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