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2023 International Symposium on Electrical Insulating Materials, ISEIM 2023

作者： Miyaji, Yoshitaka Ishikawa, Hirotaku Enoki, Kaisei Endo, Kazuki Miyake, Hiroaki Tanaka, Yasuhiro Advanced Technology R&D Center Mitsubishi Electric Corp Hyogo Japan Depertment of Mechanical Engineering Tokyo City University Tokyo Japan

ISBN: (纸本)9784886864376

The increasing use of power electronics equipment in various operating environments has raised concerns about the space charge accumulation in insulation materials, especially in high-radiation environments. In order to ensure more robust reliability of power electronics equipment, it is important to have a better understanding of the space charge phenomena in insulation materials. In this study, we investigated the estimation of material properties related to space charge accumulation through the space charge transport simulation using machine learning. As results, the inverse analysis technique for estimating material properties related to charging through the space charge transport simulation was developed. However, some estimated values of material properties with low sensitivity to the space charge simulation had errors as large as approximately 10% compared to the true values. Therefore, it is necessary to consider improving the mathematical model of the space charge transport simulation as well as applying the inverse analysis technique to actual insulation materials in the future. © 2023 The Institute of Electrical Engineers of Japan.

关键词： Machine learning

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AC Loss Investigation for HTS Stacked Cable with Optimized Gaps among Tapes

AC Loss Investigation for HTS Stacked Cable with Optimized G...

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2023 IEEE International Conference on Applied Superconductivity and Electromagnetic devices, ASEMd 2023

作者： Fu, Lin Chen, Yu Shen, Boyang Xu, Junqi Chen, Xiaohong Kang, Jinsong Jiang, Shan Tongji University Institute of Rail Transit and Maglev Transportation Engineering R&d Center Shanghai China Sichuan University College of Electrical Engineering Sichuan Chengdu China

ISBN: (纸本)9798350301571

The cable stacked by high temperature superconducting tapes have strong anisotropic magnetic field dependence due to the fundamental anisotropic property inherited from reBCO materials. With the number of tapes increasing, the maximum perpendicular field components appearing around degrade the critical current and carry current capacity of the whole conductor, and even cause significant AC loss during practical operations. To reduce the ac loss of the stacked conductor, this paper investigates different gap optimization methods in non-twisted stack of reBCO tapes. Finite element simulations and performance comparisons a stacked conductor (10 tapes) without any gap, and with uniform gap schemes are presented. The results obtained show that the gap optimizations have much better effects towards AC loss reduction compared to a direct stacked tape. designs based on non-twisted stacks can be simpler, more robust and cost effective than twisted ones. Therefore, this gap optimization methods among stacked tapes can be well expected to explore some high current design and performance evaluation schemes for large-scale HTS magnet developments and applications. © 2023 IEEE.

关键词： AC loss gap optimization high-temperature superconductor (HTS) stacked cable

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Simulation and Analysis of Spiral Joints in Superconducting Magnets

Simulation and Analysis of Spiral Joints in Superconducting ...

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2023 IEEE International Conference on Applied Superconductivity and Electromagnetic devices, ASEMd 2023

作者： Chen, Yu Shen, Boyang Fu, Lin Xu, Junqi Chen, Xiaohong Che, Tong Zheng, Pengfei Tongji University Institute of Rail Transit and Maglev Transportation Engineering R&d Center Shanghai China Southwestern Institute of Physics Chengdu China

ISBN: (纸本)9798350301571

High-temperature superconducting coils/magnets are widely used in the design and fabrication of high-energy physics and nuclear physics magnets. And the devices are generally used to integrate the assembly of large superconducting magnets by means of series-parallel connections between the pancakes. Considering the limited length of a single tape, superconducting joints are often required to create current transfer paths between and within the coils. Currently, superconducting magnets with axial gap optimization can achieve superior performance such as precise control of magnetic field, critical current enhancement, and improved mechanical properties. However, the spiral surfaces and gaps of neighboring coils increase the technical difficulty of welding. In this work, the resistance characteristics of joints with different lengths are evaluated by experimental tests, and the simulation model of superconducting joints is established by combining analytical methods. Joint design guidelines and performance evaluation methods can be provided for the design and fabrication of superconducting magnets considering the axial gap and angle of coils. © 2023 IEEE.

关键词： high-temperature superconductor (HTS) joint resistance superconducting joint superconducting magnet

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Building Energy Management Considering Nonlinearity of Electric Equipment with PV-Battery Systems during Power Outage

Building Energy Management Considering Nonlinearity of Elect...

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2023 IEEE PES Innovative Smart Grid Technologies - Asia, ISGT Asia 2023

作者： Kimura, Yuta Yamaguchi, Nobuyuki Sato, Fuyuki Mineyuki, Takuma Kawano, Hiroki Tokyo University of Science Department of Electric Engineering Tokyo Japan Information Technology R&d Center Mitsubishi Electric Corporation Kanagawa Japan

ISBN: (纸本)9798350327748

Optimization of energy management in office buildings is essential to get through power outages while continuing business operations. For this purpose, an accurate mathematical model of energy management is necessary. This study proposes a mathematical model for optimal building operation during power outages. The model is formulated using nonlinear functions with the number of workers on each floor and the power consumption of demand facilities as control variables and solved as a mixed integer linear programming method to minimize the damage that occurs during a power outage. Numerical experiments using actual building data verify the validity of the proposed method by comparing optimized human and facility operational plans using the proposed and conventional models. © 2023 IEEE.

关键词： Energy management

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A Survey: FPGA-Based dynamic Scheduling of Hardware Tasks

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Chinese Journal of Electronics 2021年第6期30卷 991-1007页

作者： LI Tianyang ZHANG Fan GUO Wei SUN Mingqian CHEN Li PLA Strategic Support Force Information Engineering University National Digital Switching System Engineering and Technological R&D Center Southeast University

To meet the increasing computing needs of various application fields, Field programmable gate array(FPGA) has been widely deployed. In FPGA-based processing, hardware tasks can be better accelerated by allocating appropriate computing resources. Therefore,FPGA-based hardware task scheduling has become one of the mainstream research directions in academia and industry. However, the optimization objectives of existing FPGA-based hardware task scheduling methods are relatively scattered. In this regard, this paper summarizes the research status of hardware task dynamic scheduling from the three essential elements of FPGA processing: time, resources, and power *** paper analyzes, sorts out, categorizes the ideas and implementations of various scheduling methods and analyzes and evaluates optimization effects of various scheduling methods from multiple dimensions. Then, the shortcomings of the existing methods are summarized and some practical applications are introduced. Finally, the research direction of task scheduling based on FPGA is prospected and summarized.

关键词： optimisation Field programmable gate array FPGA-based dynamic scheduling mainstream research directions appropriate computing resources dynamic scheduling optimization objectives hardware task dynamic scheduling power consumption field programmable gate arrays

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Comparative Study on Tunnel Boring Machine and drilling-Blasting Methods for Tunnels based on FLAC3d 3

Comparative Study on Tunnel Boring Machine and Drilling-Blas...

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3rd International Conference on Mechanical design and Simulation, MdS 2023

作者： Cao, Aiwu Wu, Jiayao Chu, Weijiang Wang, dongfeng Cheng, Yongjin PowerChina Huadong Engineering Co. Ltd HangZhou311122 China Hydro-China Itasca R&D Center HangZhou311122 China

ISBN: (纸本)9781510664890

Excavation damage zone (EdZ) has a great influence on the stability and support design for tunnels. To better describe the difference of EdZ in hard rock caused by tunnel boring machine (TBM) and drilling-blasting (d&B) method, the scope and degree of EdZ were considered. The scope of EdZ was determined by the test results from similar engineering. The degree of EdZ was determined by the Hoek-Brown criteria and the EdZ analysis of underground caverns. Combined with Ninghai pumped storage power station, FLAC3d was used to analyze the difference. For an access tunnel with a diameter of 9.80m, the displacement with the TBM method is about 65-80 % compared with the d&B method, and the depth of the plastic zone is only half. The analysis results are also consistent with field test results. Which means the analysis method is reliable and effective. © 2023 SPIE.

关键词： Construction equipment

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Optimization of Energy-Saving Operation of High-Speed Maglev Traction Based on Genetic Algorithm

Optimization of Energy-Saving Operation of High-Speed Maglev...

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International Conference on Artificial Intelligence and Autonomous Transportation, AIAT 2024

作者： Gao, Wanying Huang, Jingyu Zhang, Ziyang Fu, Xinxin National Maglev Transportation Engineering R&D Center Tongji University Shanghai201804 China Institute of Rail Transit Tongji University Shanghai201804 China College of Civil Engineering Tongji University Shanghai200092 China

ISBN: (纸本)9789819639649

Maglev trains have line adaptability, low noise, low vibration, and have the potential for ultra-high operating speeds. Although maglev trains eliminate the energy consumption caused by wheel-rail friction, the significant aerodynamic energy consumption resulting from high-speed operation cannot be ignored. However, current research on energy consumption optimization for high-speed maglev trains remains relatively limited. This paper establishes an operation optimization mathematical model for high-speed maglev trains and proposes an energy-saving optimization method based on genetic algorithm. The speed curve is optimized by adjusting the time points for the transition of the train’s working conditions in the traction, uniform speed, idling, and deceleration phases, and the study provides an in-depth analysis of the train’s energy consumption and running time under different operating conditions. The results indicate that by setting different weighting coefficients, the proposed method can flexibly adjust the balance between travel time and energy consumption. In addition, the selection of maximum speed has a significant impact on both energy consumption and travel time. When the maximum speed is reduced to 300 km/h, the energy consumption optimization rate reaches 28.6%, with an increase in travel time of 11.24%. The optimization method proposed in this paper can provide theoretical support and technical guidance for the energy-saving operation of high-speed maglev trains. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Travel time

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Mixed Eccentricity detection by Identification of Harmonic Order of No-load Line-line Voltages in Multi-three-phase PMSMs 26

Mixed Eccentricity Detection by Identification of Harmonic O...

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26th International Conference on Electrical Machines and Systems, ICEMS 2023

作者： Okazaki, Kodai Akatsu, Kan Yang, Kan Mitsubishi Electric Corporation Advanced Technology R&D Center Hyogo Japan Yokohama National University Department of Electrical Engineering Kanagawa Japan

ISBN: (纸本)9798350317589

Permanent magnet synchronous motors (PMSMs) have many advantages such as high efficiency. As they are widely utilized for many applications, requirements of less noise and fewer vibrations increase. For a suppression control to the vibration caused by air-gap imbalances, using multi-three-phase PMSMs are suitable method because they can use common three phase inverters. We must detect the air-gap imbalances including static eccentricity and dynamic eccentricity to the suppression control. This paper proposes a method that separately detects static and dynamic eccentricity considering characteristics of the harmonic components of no-load line-line voltages. The method confirms its detection ability by a finite element analysis (FEA) model with eccentricity. © 2023 IEEE.

关键词： Permanent magnets

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Optimal design of Contact Configuration for High Voltage Vacuum Interrupter Based on response Surface Method and Multi Objective Genetic Algorithm 30

Optimal Design of Contact Configuration for High Voltage Vac...

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30th International Symposium on discharges and Electrical Insulation in Vacuum, ISdEIV 2023

作者： Na, Jin-Yong Hwang, ryul Kim, Geon Cha, Young-Kwang Ju, Heung-Jin Lee, Bang-Wook Hanyang University Electrical Engineering Ansan Korea Republic of R&d Center Vitzro em Co. Ltd Ansan Korea Republic of

ISBN: (纸本)9784886864369

Magnetic field generated by the contacts of Vacuum Interrupter (VI) support the interruption of fault current. Therefore, the interruption performance of VI is mainly influenced by the contact configuration. To develop high voltage VI, it is important to design and optimize the contact configuration applicable in high voltage system. Various contact configurations have been suggested for high voltage VI in the literature, whereas the optimization technique of suggested designs has not been performed yet. Therefore, in this paper, the optimization technique of the contact configuration for high voltage VI was proposed based on response surface method (rSM) and multi objective genetic algorithm (MOGA). The four design factors and three objectives were considered for optimization. The four design factors are coil height (h), coil width (w), slit length (l) and mounted angle (a). The three objectives are maximum axial magnetic flux density at peak current (Bz), effective area (λ), and maximum axial magnetic flux density at current zero (Bzo). The optimization was performed by applying MOGA to the regression equation of the objectives derived by rSM with Central Composite design (CCd). As a result of optimization, Bz and effective area increased by 6% and 9%, while Bzo decreased by 10%. Consequently, it was confirmed that the interruption performance of high voltage VI could be improved by optimization. © 2023 IEEJ.

关键词： Genetic algorithms

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The temporal variations of PM10 concentration in Taipei: a fractal approach

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Aerosol and Air Quality research 2024年第1期4卷 38-55页

作者： Ho, ding-Shun Juang, Lain-Chuen Liao, Yu-Ying Wang, Cheng-Cai Lee, Chung-Kung Hsu, Ting-Chu Yang, Shaw-Yang Yu, Chung-Chin Green Environment R&D Center Department of Environmental Engineering Vanung University Chung-Li 320 Taiwan ROC Green Environment R&D Center Department of Civil Engineering Vanung University Chung-Li 320 Taiwan ROC

A one-year series of hourly average PM10 observations, which was obtained from the urban and national park air monitoring station at Taipei (Taiwan), was analyzed by descriptive statistics and fractal methods to examine the temporal structures of PM10 concentrations. It was found that all PM10 measurements exhibited the characteristic right-skewed unimodal frequency distribution and long-term memory. A monodimensional fractal analysis was performed by transferring the PM10 concentration time series into a useful compact form: the box-dimension (dB)-threshold (Th) and critical scale (CS)-threshold (Th) plots. Scale invariance was found in these time series and the box dimension was shown to be a decreasing function of the threshold PM10 level, implying multifractal characteristics, (i.e., the weak and intense regions scale differently). To test this hypothesis, the PM10 concentration time series were transferred into multifractal spectra, i.e., the τ(q)-q plots. The analysis confirmed the existence of multifractal characteristics. A simple two-scale Cantor set with unequal scales and weights was then used to fit the calculated τ(q)-q plots. This model fits well with the entire spectrum of scaling exponents for the examined PM10 time series. The relationship between the fractal parameters and classical statistical characteristics, as well as some problems concerning the applicability of fractal methods on air pollution, are discussed.

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