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Coordinated control between a grid forming inverter and grid following inverters suppling power in a standalone microgrid

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Global Energy Interconnection 2022年第3期5卷 259-265页

作者： Junichi Arai yasuhiro taguchi Kogakuin University 1-24-2 Nishi-ShinjukuShinjukuTokyo 163-8677Japan Energy and Environment Technology Research Institute 1-22-2 Nishi-Waseda ShinjukuNishi-Waseda East Wing 106Tokyo 169-0051Japan

Battery energy storage systems,fuel cells,and photovoltaic generators are being adopted in distribution networks to achieve CO;emission *** power sources require inverters to connect to AC ***,sub-networks,such as a microgrids containing inverter power sources,may be disconnected from the utility network and operated in a standalone mode during extended *** study focuses on a standalone microgrid supplied by inverter power sources without a synchronous generator and proposes a new microgrid inverter *** this inverter control,a single grid forming inverter is operated as a master power source to determine frequency and voltage,and other inverters,called grid following inverters,are operated as subordinate power sources with active and reactive power *** necessary functions in the energy management system are examined,and the coordinated operation of all inverters in the microgrid is demonstrated via simulation.

关键词： Inverter control Microgrid Standalone operation Energy management system Grid forming inverter Grid following inverter

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Microstructure and Electrochemical Corrosion Behavior of Fe-Cr System Alloys as Substitutes for Ni-Based Brazing Filler Metal

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Acta Metallurgica Sinica(English Letters) 2016年第8期29卷 697-706页

作者： kangdao shi takahiro tsunoda ikuo shohji kotaro matsu yasuhiro taguchi Graduate School of Engineering Gunma UniversityKiryuGunma 376-8515Japan Graduate School of Science and Technology Gunma UniversityKiryuGunma 376-8515Japan Tokyo Braze Co LtdShikiSaitarma 353-0001Japan

Two new Fe-Cr system alloys,Fe-20Cr-43Ni-10P（mass%）and Fe-20Cr-20Ni-8P-5Si-2Mo（mass%）,have been developed as substitutes for the expensive Ni-based brazing filler metal used in brazing exhaust gas recirculation *** microstructures and melting properties of the alloys were analyzed by electron probe X-ray microanalyzer and differential scanning *** electrochemical characteristics of the alloys were investigated by potentiodynamic polarization testing in an electrolyte solution made in accordance with the standards of the Automobile Manufacturers Association of ***,the corrosion behaviors of the alloys were investigated by constant-potential polarization testing and surface *** is found that both alloys are composed of solid-solution phases and phosphide *** solid-solution phases serve as the anode,and the phosphide phases serve as the cathode in the corrosion reaction for both ***-20Cr-43Ni-10 P exhibits galvanic corrosion on the entire *** contrast,Fe-20Cr-20Ni-8P-5Si-2Mo is attacked at a few localized areas so that the cavities form on the *** corrosion potential（E_（corr）） is lower than that of Ni-29Cr-6P-4Si（mass%）for both *** means that the Fe-Cr system alloys are more easily corroded than *** corrosion rate and corrosion resistance cannot be investigated by the corrosion current density（i_（corr）） and polarization resistance（R_p）,respectively,because of localized corrosion of the two alloys.

关键词： Iron-chromium system alloy Microstructure Electrochemical corrosion Brazing

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Cochlear Implantation in Patients with Eosinophilic Otitis Media

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International Journal of Otolaryngology and Head & Neck Surgery 2015年第1期4卷 32-37页

作者： Masahiro Takahashi yasuhiro Arai Naoko Sakuma Daisuke Sano Goshi Nishimura Takahide taguchi Nobuhiko Oridate Satoshi Iwasaki Shin-Ichi Usami Department of Otorhinolaryngology Head and Neck Surgery Yokohama City University School of Medicine Yokohama Japan Department of Otorhinolaryngology International University of Health and Welfare Mita Hospital Tokyo Japan Department of Otorhinolaryngology Shinshu University School of Medicine Nagano Japan

It is known that cochlear implantation for deaf patients with eosinophilic otitis media (EOM) is safe and can provide good speech perception. However, the best timing of implant surgery in patients with EOM is not yet known. The aim of this case report is to suggest the appropriate timing of the surgery in EOM patients with deaf. Cochlear implantation was indicated in two patients with EOM. One underwent cochlear implantation in the absence of any ear discharge. In the other case, implant surgery was delayed for three years due to persistent ear discharge. No complications related to implant device or skin flap were observed in either case. The speech recognition score after implantation was good in the first case and poor in the second case. Perioperative complications were manageable even in the patient with persistent ear discharge. However, the delay in implant surgery due to the persistent ear discharge resulted in a poor speech recognition score. Early implantation should be considered even in EOM patients with ear discharge, although the presence of active middle ear inflammation is regarded as one of the contraindications for implantation according to the current Japanese guidelines.

关键词： Eosinophilic Otitis Media Cochlear Implantation Speech Recognition

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基于ISDB-T的移动电视广播新技术

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世界宽带网络 2008年第7期15卷 31-35页

作者：冈野正吉野 Masahiro Okano Yoshikazu Narikiyo Makoto taguchi Kenichi Tsuchida Masayuki Takada HiroyukiHamazumi yasuhiro lto KazuhikoShibuy 靳大千（编译）

所周知，日本是地震和海啸频发的国家。日本政府历来对地震和海啸等自然灾害的紧急报警广播系统的建设非常重视。自从1985年9月紧急报警广播系统投入使用以来＋国家或市政府大范围的自然灾害报警广播就使用了15次（全部是海啸报警）。

关键词：日本移动电视广播技术紧急广播系统

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