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38th International Cosmic Ray Conference, ICRC 2023

作者： Tsurumi, Miwa Enoto, Teruaki Ikkatai, Yuko Wu, Ting Wang, Daohong Shinoda, Taro Nakazawa, Kazuhiro Tsuji, Noki Gabriel, Diniz Kaoataoka, Jun Iwashita, Ryoji Koshikawa, Nanase Kamogawa, Masashi Takagaki, Toru Miyake, Shoko Tomioka, Dai Morimoto, Takeshi Nakamura, Yoshitaka Tsuchiya, Harufumi Department of Physics Graduate School of Science Kyoto University Kyoto Japan Graduate School of Science and Engineering Aoyama Gakuin University Kanagawa Japan Extreme Natural Phenomena RIKEN Hakubi Research Team Cluster of Pioneering Research RIKEN Saitama Japan Institute of Human and Social Sciences Kanazawa University Ishikawa Japan Department of Electrical Electronic and Computer Engineering Gifu University Gifu Japan Institute for Space-Earth Environmental Research Nagoya University Aichi Japan Kobayashi-Maskawa Institute for the Origin of Particles and the Universe Nagoya University Aichi Japan Faculty of Science and Engineering Waseda University Tokyo Japan Global Center for Asian and Regional Research University of Shizuoka Shizuoka Japan TAC Inc. Kyoto Japan Ibaraki College Ibaraki Japan Faculty of Science and Engineering Kindai University Osaka Japan Department of Electrical Engineering Kobe City College of Technology Hyogo Japan Nuclear Science and Engineering Center Japan Atomic Energy Agency Ibaraki Japan

The interaction between cosmic rays and thunderclouds has attracted much attention in recent years. Cosmic rays have been considered as one possible cause of the trigger of lightning flashes: e.g., a possible correlation between the number of observed lightning and cosmic ray flux (e.g.,Themis G. Chronis, journal of Climate,2009). In thunderclouds, electric fields are thought to cause relativistic acceleration of electrons as an interaction with cosmic ray air shower and emit bremsstrahlung photons, known as gamma-ray glows. One unresolved is that such electron acceleration, and thus gamma-ray glows, may be related to initiating lightning flashes. To verify this hypothesis, we conducted winter thundercloud observations using mapping radiation measurements in Japan. At 04:06–04:08 JST on December 30, 2021, five radiation detectors recorded a gamma-ray glow, terminated with the lightning flash recorded by two lightning mapping systems (FALMA and DALMA). Our multi-location observation revealed that the gamma-ray glow region had a horizontal size of about 2 km×2.5 km. The XRAIN radar observation showed that the high reflectivity area, presumably corresponding to the electron acceleration region, reaches more than 2 km above the gamma-ray detected radiation detectors. The initiation of this lightning discharge started from 1.6 km altitude from the ground around the gamma-ray glow region [1]. This result indicates that the lightning flash began in the vicinity of the electric field region and a possible connection between the cosmic ray interaction with the electric fields in thundercloud and the triggering of the lightning flash. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Gamma rays

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Local iron loss distribution in iron cores with a thermographic camera

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IEEJ Transactions on Fundamentals and Materials 2021年第6期141卷 398-404页

作者： Noboridate, Yuki Sato, Takeru Todaka, Takashi Shimoji, Hiroyasu Electrical and Electronic Engineering Course Department of Engineering The Graduate School Oita University 700 Dannoharu Oita870-1192 Japan Oita Prefectural Organization for Industry Creation 1-4361-10 Takaenishi Oita870-1117 Japan

It is well known that magnetic properties deteriorate and iron losses increase due to strains induced in motor cores made of electrical steel sheets during those manufacturing process. We have developed a thermal measurement system of the iron loss distributions with a thermography camera in order to clarify the deterioration degree of the magnetic properties depending on different processing methods. In this paper, firstly the iron loss distributions in rectangular specimen of the electrical steel sheet cut with different cutting methods are measured with the thermal measurement system and those results are compared. Three cutting methods are used in this investigation;the wire electric discharge cut, laser cut and water jet processing. Also effect of lamination method is investigated by using the samples welded after processed with the wire electric discharge cutting to be a rectangular sheet. It was shown that the variations of the iron loss distributions in width direction were measurable with the presented method and the largest degradation occurred around welding position. © 2021 The Institute of electrical Engineers of Japan.

关键词： Thermography (imaging)

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Symplectic discrete-time Krasovskii passivity-based control for output consensus*

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IFAC-PapersOnLine 2023年第2期56卷 8562-8567页

作者： Yu Kawano Alessio Moreschini Michele Cucuzzella Graduate School of Advanced Science and Engineering Hiroshima University Higashi-hiroshima 739-8527 Japan Department of Electrical and Electronic Engineering Imperial College London SW7 2AZ London U.K. Department of Electrical Computer and Biomedical Engineering University of Pavia 27100 Pavia Italy

In this paper, we design a sampled-data distributed output feedback controller to achieve output consensus for linear continuous-time port-Hamiltonian systems in presence of unknown disturbances. The key idea is borrowed from Krasovskii passivity-based output consensus control for continuous-time dynamics. To conceptualise this rationale to sampled control systems, we deal with a discrete-time system arising from a symplectic discretization of a continuous-time linear port-Hamiltonian system, such as the implicit midpoint method. As a preliminary step, we introduce the concept of Krasovskii passivity for discrete-time systems and further show that a discretized linear port-Hamiltonian system is Krasovskii passive in the discrete-time sense. Then, based on the discrete-time version of Krasovskii passivity, we develop a sampled-data output feedback controller to achieve output consensus. The proposed sampled-data controller can be understood as a symplectic discretization of the continuous-time output consensus controller. Finally, we illustrate the effectiveness of the main result by achieving current sharing in a DC power network.

关键词： Sampled-data control port-Hamiltonian systems passivity output consensus

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Normal and Antenna Mode Coupling Due to Mode Impedance Mismatch in Two-Conductor Transmission Line

Normal and Antenna Mode Coupling Due to Mode Impedance Misma...

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Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC)

作者： Souma Jinno Shuji Kitora Hiroshi Toki Masayuki Abe Department of Electrical and Electronic Systems Engineering Osaka Institute of Technology Osaka Japan Health and Counseling Center Osaka University Osaka Japan Graduate School of Engineering Science Osaka University Osaka Japan

ISBN: (数字)9784885523472

ISBN: (纸本)9798350349498

This paper examines the generation of electromagnetic noise caused by coupling between normal mode (NM) and antenna mode (AM) in a two-conductor transmission line (TL). We derive the telegraph equations for NM and AM using electromagnetic potentials and quantity the coupling effect at the connection of TLs with different mode impedances based on experimental and numerical observations. This study demonstrates that impedance matching of TLs requires the consideration of not only NM impedance but also coupling impedance.

关键词： Couplings Electric potential Power transmission lines Impedance matching Noise Electromagnetic compatibility Transmission line theory

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The Three-Level Zero Harmonic Distortion Grid-Forming Converter: A Practical Filterless Solution for Sinusoidal Voltages

The Three-Level Zero Harmonic Distortion Grid-Forming Conver...

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International (EPE-PEMC) Power electronics and Motion Control Conference

作者： Gabriel V. Ramos Thiago M. Parreiras Braz de J. C. Filho Graduate Program in Electrical Engineering Universidade Federal de Minas Gerais Belo Horizonte MG Brazil Department of Electrical Engineering Centro Federal de Educação Tecnológica de Minas Gerais Belo Horizonte Brazil Department of Electrical Engineering Universidade Federal de Minas Gerais Belo Horizonte Brazil

ISBN: (数字)9798350385236

ISBN: (纸本)9798350385243

The world is rapidly shifting from centralized power generation to distributed generation (DG) with renewable sources near consumers. This transition enhances voltage and frequency stability in microgrids (MGs) and islanded systems, thanks to inverter-based resources. This work introduces the Three-Level Zero Harmonic Distortion (ZHD) grid-forming converter, which produces a sinusoidal voltage without needing costly and inefficient capacitive filters that can cause resonance issues. By combining harmonic cancellation in a three-winding transformer with Selective Harmonic Elimination Pulse Width Modulation (SHE PWM), the ZHD converter maintains voltage and frequency delivering sinusoidal waveforms even under nonlinear loads. This paper aims to address the main elements of the Three-Level Zero Harmonic Distortion (ZHD) grid-forming concept, including practical implementation considerations, applicable topologies, and simulation results.

关键词： Filters Simulation Resonant frequency Pulse width modulation Harmonic analysis Frequency conversion Harmonic distortion Voltage control Power harmonic filters Grid forming

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Autonomous Mobile Robot Equipped with a Monocular Camera and Cross-line Laser that Can Measure Obstacle Distance in Real Time Independent of Brightness

Autonomous Mobile Robot Equipped with a Monocular Camera and...

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Mediterranean Conference on Control and Automation (MED)

作者： Hayato Mitsuhashi Sota Akamine Taku Itami Jun Yoneyama Graduate School of Science and Engineering Aoyama Gakuin University Sagamihara Kanagawa Japan Department of Electrical and Electronic Engineering Aoyama Gakuin University Sagamihara Kanagawa Japan

In this paper, we propose an algorithm that can measure obstacle distances in real time independent of brightness. The proposed method acquires camera information from a robot equipped with a cross-line laser and a monocular camera, binarizes only the cross-line laser light data using YUV values as threshold values, and calculates the ratio of color and luminance, thereby improving the method to measure the linear distance to obstacles in real time even in bright environments. Experimental results confirm that the proposed method can accurately detect the distance to obstacles. It was also able to accurately calculate the distance to obstacles even when the measurement environment was bright (717 Lux).

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Utility of dual screen e-paper for writing using reference documents 58th

Utility of dual screen e-paper for writing using reference d...

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58th International Symposium on Digest of Technical Papers, ICDT 2021

作者： Fujisaki, Kanako Omodani, Makoto Department of Electrical and Electronic Engineering Graduate School of Engineering Tokai University Japan Division of Information Systems and Design School of Science and Engineering Tokyo Denki University Japan

Dual screen e-Paper is expected to be useful when creating documents using reference documents. This study evaluated performances of referencing conditions using paper, e-Paper, and LCD and suggested that the working conditions using dual screen e-Paper brought almost the same performance as the working conditions using paper as a reference. © 2021 SID.

关键词： Liquid crystal displays

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A Three-Level Zero Harmonic Distortion Grid-Forming Converter For Medium Voltage Islanded Microgrids

A Three-Level Zero Harmonic Distortion Grid-Forming Converte...

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European Conference on Power electronics and Applications

作者： Gabriel V. Ramos Thiago M. Parreiras Braz De J. C. Filho Graduate Program in Electrical Engineering Universidade Federal de Minas Gerais Belo Horizonte MG Brazil Department of Electrical Engineering Centro Federal de Educação Tecnológica de Minas Gerais Belo Horizonte Brazil Department of Electrical Engineering Universidade Federal de Minas Gerais Belo Horizonte Brazil

ISBN: (数字)9798350364446

ISBN: (纸本)9798350364453

The world has been experiencing a fast change in the production and use of electrical energy. The electric power system is fast changing from the conventional centralized generation to a more distributed generation (DG) with renewable energy sources installed near the consumers. The evolution of DG paves the way for the concept of grid-forming converters improving voltage and frequency stability in microgrids (MGs) and islanded applications, due to the growth of inverter-based resources. In islanded MG, power quality is a concern due to the presence of disturbing loads and possible resonance issues encountered with multiple electronically interfaced distributed energy resources (DERs) and loads. The present work proposes the Three-Level Zero Harmonic Distortion Converter (ZHD) grid-forming converter due to its inherently sinusoidal voltage source characteristic without the need of capacitive filtering elements that negatively impact in costs, efficiency, size and can be a source of resonances issues. These features are achieved by the proper combination of harmonic cancellation in a three-winding transformer and harmonic elimination using the Selective Harmonic Elimination Pulse Width Modulation (SHE PWM). Simulation results show the Three-Level ZHD converter setting voltage and frequency to an Medium Voltage (MV) islanded microgrid, delivering sinusoidal voltage waveforms even in the presence of nonlinear loads. The converter is able to maintain the voltage distortion below the IEEE 519 limits by respecting the current harmonic limits imposed by the same standard.

关键词： Simulation Resonant frequency Microgrids Medium voltage Pulse width modulation Harmonic analysis Frequency conversion Harmonic distortion Power harmonic filters Grid forming

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Revisiting Near-Far Field Boundary in Dual-Polarized XL-MIMO Systems

arXiv

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arXiv 2025年

作者： Zeng, Shuhao Di, Boya Zhang, Hongliang Han, Zhu Vincent Poor, H. School of Electronic and Computer Engineering Peking University Shenzhen Graduate School Shenzhen China Department of Electrical and Computer Engineering Princeton University NJ United States School of Electronics Peking University Beijing100871 China Electrical and Computer Engineering Department University of Houston HoustonTX United States Department of Computer Science and Engineering Kyung Hee University Seoul Korea Republic of

Extremely large-scale multiple-input multiple-output (XL-MIMO) is expected to be an important technology in future sixth generation (6G) networks. Compared with conventional single-polarized XL-MIMO, where signals are transmitted and received in only one polarization direction, dual-polarized XL-MIMO systems achieve higher data rate by improving multiplexing performances, and thus are the focus of this paper. Due to enlarged aperture, near-field regions become non-negligible in XL-MIMO communications, necessitating accurate near-far field boundary characterizations. However, existing boundaries developed for single-polarized systems only consider phase or power differences across array elements while irrespective of cross-polarization discrimination (XPD) variances in dual-polarized XL-MIMO systems, deteriorating transmit covariance optimization performances. In this paper, we revisit near-far field boundaries for dual-polarized XL-MIMO systems by taking XPD differences into account, which faces the following challenge. Unlike existing near-far field boundaries, which only need to consider co-polarized channel components, deriving boundaries for dual-polarized XL-MIMO systems requires modeling joint effects of co-polarized and cross-polarized components. To address this issue, we model XPD variations across antennas and introduce a non-uniform XPD distance to complement existing near-far field boundaries. Based on the new distance criterion, we propose an efficient scheme to optimize transmit covariance. Numerical results validate our analysis and demonstrate the proposed algorithm’s effectiveness. Copyright © 2025, The Authors. All rights reserved.

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An event-driven approach for resources planning in distributed power generation systems

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International Journal of electrical Power and Energy Systems 2022年 137卷 107768-107768页

作者： Maschio, Dierli M.R. Duarte, Bruno Lazzaretti, André E. Lafay, Jean-Marc S. Adzkiya, Dieky da Costa, Jean Patric Teixeira, Marcelo Graduate Program in Electrical Engineering Federal University of Technology Paraná Brazil Graduate Program in Electrical Engineering and Industrial Informatics Federal University of Technology Paraná Brazil Department of Mathematics Institut Teknologi Sepuluh Nopember Indonesia

Renewable Energy Sources (RESs) stand as a straightforward alternative to complement the energy grid and have been recurrently integrated into the generation and distribution matrices. Physically, generation components have distributed nature and they are expected to work coordinately, complementing each other to supply centralised microgrids, which interface them with the main power grid and consumers. As RESs have intermittent nature, engineers are limited to plan resources consumption, fulfil unit commitments, stratify time, cost, environmental impact, and quality of energy. This paper exploits the event-driven behaviour of microgrids to provide ways for them to recognise their context and cooperate towards common goals. Our main result is a Petri net simulation model that estimates customisation policies to be applied back over the microgridvia event-based control. Results show that in some cases it is possible to save effort (and resources) of power generation by replacing reactiveness for a more balanced, context-aware, energy chain. A real photovoltaic plant is modelled by our approach with 86% accuracy. © 2021 Elsevier Ltd

关键词： Renewable energy resources

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