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2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

作者： Xu, Mengqi Cai, Tianle Ma, Ke Zhou, dangsheng Wang, Sufei Wu, Tianhao Shanghai Jiaotong University Department of Electrical Engineering Shanghai China Shenzhen Hopewind Electric Co. Ltd R&d Center Shenzhen China

ISBN: (纸本)9798350316445

With the growing demand for highly reliable power electronic systems, the degradation diagnosis of the insulated gate bipolar transistor (IGBT) modules is becoming increasingly attractive. due to its complicated construction and complex operating conditions, IGBT modules are subject to various degradation mechanisms. However, most existing approaches for degradation diagnosis are designed to identify only one type/location of degradation. In this paper, a novel approach for diagnosing degradations in power modules based on the frequency-domain heat flow analysis is provided. different locations of degradation can be easily distinguished by using this proposed method, which has been validated through finite-element method (FEM) simulations and experiments. © 2023 IEEE.

关键词： degradation monitoring power semiconductor device thermal network

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Transmission count optimization for environmental monitoring using Bluetooth mesh 12

Transmission count optimization for environmental monitoring...

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12th IEEE Global Conference on Consumer Electronics, GCCE 2023

作者： Ichii, Hiroyuki Sumi, Takenori Nagai, Yukimasa Kawashima, Yuki Kitazawa, Shoichi Mitsubishi Electric Corporation Information Technology R&d Center Kamakura Japan Muroran Institute of Technology Graduate School of Aerospace Engineering Muroran Japan

ISBN: (纸本)9798350340181

Improving livelihood by environmental monitoring is realized by sensor data, e.g. temperature, humidity, light and CO2. Bluetooth mesh is getting attraction to deploy large-scale sensor networks. Bluetooth mesh uses a flooding method that forwards packets to all nodes within the communication range to improve packet delivery rate without acknowledgement. However, if there are nodes in the network with limited transmission paths and packets are lost between them, the E2E (End-to-End) packet delivery rate will decrease. Therefore, we propose a transmission count optimization method to control the number of transmissions in Bluetooth mesh, which appropriately increases the parameter of the number of transmissions only for nodes with limited transmission paths. This improves approximately 1.3 points (default: 98.46%, Proposed: 99.76%) of the E2E packet delivery rate while reducing the increase in power consumption from conventional approach. © 2023 IEEE.

关键词： Bluetooth

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research on network traffic acquisition based on in-band telemetry technology 3

Research on network traffic acquisition based on in-band tel...

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3rd International Conference on Computer Science and Communication Technology, ICCSCT 2022

作者： Cheng, Lili Xiao, Pengbo Gao, Lisha Zhou, Pan Liu, Yanqi Department of Mechanical and Electrical Engineering Wenhua College Hubei Wuhan China Agricultural Bank of China R&D Center Wuhan R&D Department Hubei Wuhan China

ISBN: (纸本)9781510661240

Network measurement technology is the basis of the monitoring network devices, link and flow running state and flow behavior model. The current network measurement mainly adopts the method of active measurement, in other words, managers use injection flow probe to measure the network actively, but this method can increase the network flow and influence the state of the network and the network load. To solve this problem, this paper proposes a method that is fine-grained network traffic parameter measurement based on in-band network telemetry technology. Software defined network architecture and the principle of data plane programmable technology is introduced first, and then the process of using in-band network telemetry to obtain network traffic parameters is described in detail. Finally, this paper simulates the network environment and attack environment in the simulation environment to obtain the data set required for the experiment, and the results of the data set are analyzed to verify the effectiveness of this method based on in-band network telemetry technology. © 2022 SPIE.

关键词： denial-of-service attack

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Study on Effect of Supercritical Carbon dioxide on Mechanical Properties of Tight Sandstone reservoir in Sichuan Basin 13th

Study on Effect of Supercritical Carbon Dioxide on Mechanica...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Wang, du Luo, Wei Wang, Chuan-Lei Peng, Huan Zhou, Lang Ma, Zhi-Han Engineering Technology Research Institute of Southwest Oil and Gas Field Company PetroChina Chengdu China National Energy R&D Center of High-Sulfur Gas Reservoir Exploitation Chengdu China

ISBN: (纸本)9789819702671

In order to study the influence of supercritical carbon dioxide on the mechanical properties of tight sandstone reservoirs in the Sichuan Basin and to understand the interaction mechanism between supercritical carbon dioxide and tight sandstone, methods such as triaxial compression experiments, rock morphology analysis experiments, and whole rock analysis experiments were used to clarify the influence of supercritical carbon dioxide on the mechanical properties of sandstone in the Sichuan Basin and to preliminarily analyze the interaction mechanism between supercritical carbon dioxide and sandstone. The research results show that: (1) under the action of supercritical carbon dioxide,the compressive strength of sandstone will decrease significantly, the Young's modulus will decrease, the Poisson's ratio will increase, and the brittleness will increase;(2) with the increase of the time of supercritical carbon dioxide, the compressive strength decreases faster, the Young's modulus gradually decreases, the Poisson's ratio does not change much, and the brittleness increases. The failure mode of sandstone changes from shear failure to the complex failure mode of "tensile failure + shear failure";(3) Supercritical carbon dioxide will not only change the pore structure of sandstone, but also the mineral composition of sandstone. The conclusion is that supercritical carbon dioxide will react chemically with some minerals in sandstone, causing mineral dissolution and precipitation, and to some extent changing the pore structure of sandstone, resulting in the degradation of its mechanical properties. The research results of this paper have certain guiding significance for the design of supercritical carbon dioxide fracturing in the Sichuan Basin. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Sandstone

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Preparation,Characterization,and Performance of Lignin-based Microencapsulated red Phosphorus Flame retardant for ABS

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Journal of Wuhan University of Technology(Materials Science) 2022年第2期37卷 292-299页

作者： XIONG Lei HUANG Shaohuai ZHONG rouchao TANG Weizhong LIU Chao JIN Yanqiao College of Materials Science and Engineering Fuzhou UniversityFuzhou 350108China China National R&D Center for Tungsten Technology Xiamen Tungsten Co.LtdXiamen 361009China

The inherent difficulty in preservation and processing of conventional red phosphorus flame retardant severely limits its growing applications in polymer materials,thus,there is an urgent need to exploit effective technology to modify red *** lignin-based compounds can provide a great potential in improving the preservation and processing of red ***,we prepared melamine modified lignin/aluminum phosphate coated red phosphorus(LMAP@rP)and used it as the flame retardant of acrylonitrile-butadiene-styrene(ABS)*** 25wt%loading LMAP@rP,the ABS samples show excellent flame inhibiting capacity and reached UL-94 V-0 *** calorimetry test results show that the peak heat release rate,total heat release and total smoke release of ABS/25LMAP@rP are reduced strikingly by 64.6%,49.3%,and 30.1%,*** char residue is 15.36wt%and the char layer is continuous and *** outstanding flame retardant and smoke-suppressant performances of LMAP@rP show its application prospect for ABS.

关键词： lignin red phosphorus ABS flame retardant

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Analysis of Low-Pressure Operation Stability of Underground Hydrogen Storage Salt Cavern 56

Analysis of Low-Pressure Operation Stability of Underground ...

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56th U.S. rock Mechanics/Geomechanics Symposium

作者： dong, Jingnan Zhuang, Xiaoqian Gong, danni Ban, Fansheng Zhang, Yingbin CNPC Engineering Technology R&D Company Limited Beijing China China University of Petroleum-Beijing Beijing China HydroChina-ITASCA R&D Center Hangzhou China

ISBN: (纸本)9780979497575

In order to meet today's increasing fluctuations in energy demand, large-scale underground salt rock gas storage is widely used in the storage of fuels, including natural gas, oil and hydrogen. From the perspective of macroscopic structure and stratigraphic structure, the Jintan salt deposit in China has good sealing properties, and is an ideal solution mining area for the construction of salt rock gas storage. Salt rock has extremely low permeability and self-repairing properties, which greatly increase the sealing performance of the gas storage. Underground salt cavern hydrogen storage has been proved feasible in some area worldwide. The molecular weight of hydrogen is extremely low, so it has high requirements on the sealing performance of hydrogen storage, especially in terms of long-time storage. In this paper, two geo-mechanical models are established as one single-cavern configuration and 4-cavern configuration to analyze the stability of the hydrogen storage in terms of cavity volume shrinkage, stress distribution of rock mass around caverns, and surface subsidence. Through numerical simulation using FLAC3d, the evolution law under long-time low-pressure conditions is investigated. The tightness and stability of the trap conditions of the salt interval are studied, and the reasonable low operating pressure range of the salt rock hydrogen storage is proposed. The study found that under the condition of ensuring the stability of the salt cavity, the gas storage should keep the operating pressure from 8 MPa to 9 MPa at the depth around 800 to 1000 m. The long-term constant pressure operation at lower and higher limit did not see obvious salt cavity tensile stress concentration areas within 30 years, and the salt cavity expansion area was concentrated in the local area. For most salt cavern hydrogen storages of 800 to 1000 meters depth, 8.27 MPa is an acceptable operational pressure. Considering the surface subsidence, it is necessary to pay more attention when

关键词： Mining

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A Study on the Characteristics and Breaking Performance Improvement in Small Current region of a Low Voltage direct Current Circuit Breaker

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Transactions of the Korean Institute of Electrical Engineers 2022年第7期71卷 1040-1045页

作者： Park, Woo-Jin Ahn, Kil-Young Kim, Young-Guen Cho, Hae-Yong Dept. of Mechanical Engineering Chungbuk National University Korea Republic of Electrotechnology R&D Center LS ELECTRIC Co.Ltd. Korea Republic of

A low voltage direct current(dC) circuit breaker is an electrical protection device that interrupts the abnormal fault currents which result from the over-loads or short-circuits in a low voltage(less than 1,500Vdc) power distribution line. recently, as interests in renewable energy fields(such as photovoltaic and energy storage systems) have increased, research on dC circuit breakers for system protection is also being actively conducted. However, breaking the fault current in dC system is considerably difficult even small current region since the dC does not have current zero point such as in AC. When a short circuit occurs, a fault current flows between contacts of a dC circuit breaker even though they are separated by the protective control system. Arc voltage between contacts of the circuit breaker should generate as high as possible during breaking phase. High arc voltage could lead the fault current of the circuit to zero so that arc plasma is eliminated. Based on this behavior, arc extinction system of a dC circuit breaker should be designed to effectively increase the arc voltage during current interruption period. In this paper, the characteristics of dC breaking specially in small current region were confirmed through several types of current breaking experiments and result analysis, and a method to improve performance of dC breaking in small current region was presented, and experiments were carried out to verify the validity of the method. © 2022 Korean Institute of Electrical Engineers. All rights reserved.

关键词： Electric circuit breakers

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Strain-controlled fatigue characteristics of a cast Mg-Nd-Zn under peak-aged and over-aged conditions

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rare Metals 2023年第7期42卷 2381-2389页

作者： Zhen-Ming Li Ji-Chun dai Bao-Liang Liu Hui Zou Ji-Peng Pan Institute of Sci-technology Strategy Jiangxi Academy of SciencesNanchang330096China Zhejiang Jinfei Kaida Wheel Co. LtdJinhua321000China Research Institute(R&D Center) Shanghai JuneBang Technology CorporationShanghai200032China National Engineering Research Center of Light Alloy Net Forming Shanghai200240China National Engineering Research Center of Light Alloy Net Forming Shanghai Jiao Tong UniversityShanghai200240China

Strain-controlled fatigue characteristics of peakaged and over-aged Mg_(96.47)Nd_(2.9)Zn_(0.21)magnesium alloys containing 0.42Zr,including stress response,strain resistance,hysteresis loops,strain-life and corresponding lowcycle fatigue life prediction model,were *** the peak-aged state(T61:540℃×8 h+200℃×14 h),the alloy shows higher cyclic stress response,but lower ductility than the alloy in the over-aged state(T6_(2):540℃×8 h+200℃×400 h).The yield strength and ultimate tensile strength of the alloy under T6_(1)-and T6_(2)-treated conditions are *** with T6_(1)-treated alloy,the steady stress amplitude occurred in T6_(2)-treated alloy is due to higher ductility and more homogenous *** T6_(1)state,the fatigue cracks in the alloy first initiate along the cracked persistent slip bands and then propagate in the trans-granular mode,while in the T6_(2)state,the fatigue cracks initiate along grain boundaries and then propagate in the inter-granular mode.

关键词： Mg-Nd-Zn alloy Strain-controlled fatigue Peak-aged and over-aged conditions Hysteresis energy

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An Advanced Control Strategy for Grid Interfaced dG to Enhance Voltage Support during Unbalanced Faults 4

An Advanced Control Strategy for Grid Interfaced DG to Enhan...

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4th IEEE International Conference on Sustainable Energy and Future Electric Transportation, SEFET 2024

作者： Maganti, Suresh Yalla, Naveen Padhy, N.P. Al Beshr, Hamad Sadanandan, Sajan K. Ghaoud, Tareg Dewa R&d Center Smart Grid Integration Division Dubai United Arab Emirates Dept. of Electrical Engineering Varanasi India Mnit Jaipur IIIT Kota Rajasthan India

ISBN: (纸本)9798350383997

Numerous control strategies are proposed to support the grid voltages during asymmetrical faults. Most control strategies are based on sequence-based voltage components for three-phase, three-leg inverter-based distributed Generations(dG). Further, the reactive power injection by these control strategies affects healthy phase voltage, which limits voltage support to avoid over-voltage risk. The Three-phase, Four-leg Inverters(TFI) have recently become more popular due to their ability to supply local loads and zero sequence current control. The voltage support concept is explored less in TFI-based dGs in the case of unbalanced grid faults. In this regard, an advanced control strategy has been developed in this paper to enhance voltage support during asymmetrical grid faults. The proposed control strategy can supply zero-sequence current and reactive power injection into faulty phases without affecting healthy phase voltage magnitude, ensuring safe operating current limits. The proposed voltage support control strategy is suitable for both strong and weak voltage profiles of grids. The proposed control method is validated on a grid-interfaced, three-phase, four-leg inverter-based dG at an operating Short Circuit ratio(SCr) of 3. The performance of the developed voltage support control strategy is validated by comparing the results with those of the conventional control strategy of the same system parameters. © 2024 IEEE.

关键词： Electric power transmission networks

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Thermal History Simulation and Support-Based Optimization in L-PBF Manufacturing of Eye-Shaped Catenary Clamps

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Transactions of the Korean Institute of Electrical Engineers 2024年第2期73卷 407-411页

作者： Yun, Seok-Chul Park, Young Shin, Jaeho Intelligence Integrated SW Research Center Intelligent Information R&D Division Korea Electronics Technology Institute Korea Republic of Dept. 3D printing industry-university cooperation foundation Hanbat National University Korea Republic of Dept. of Electrical Engineering Hanbat National University Korea Republic of

This study performed thermal history simulation and strategy optimization for additive manufacturing of eye-shaped catenary clamps used in high-speed railway overhead lines. Instead of the conventional casting material CuAl10Fe2, SUS 316L material suitable for additive manufacturing and having good toughness was used. The thermal analysis simulation software for additive manufacturing was utilized to optimize the additive manufacturing strategy for the parts where heat diffusion was not sufficient. The optimized additive manufacturing strategy was verified by simulation while adding supports, and the accuracy of the simulation was confirmed by comparing the simulation results with the actual experimental results. The results of this study can provide useful guidelines for additive manufacturing of eye-shaped catenary clamps and can be applied to other parts with complex shapes. © 2024 Korean Institute of Electrical Engineers. All rights reserved.

关键词： Thermoanalysis

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