Electrical Engineering in Japan最新文献

Determination Method of Optimal Reserve Margin Based on Explainable AI Using Gaussian Process Regression Model and SHAP 基于高斯过程回归模型和SHAP的可解释人工智能最优储备余量确定方法

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2025-05-30 DOI: 10.1002/eej.23510

Keito Nishida, Ryuto Shigenobu, Akiko Takahashi, Masakazu Ito, Hisao Taoka, Norikazu Kanao, Hitoshi Sugimoto

{"title":"Determination Method of Optimal Reserve Margin Based on Explainable AI Using Gaussian Process Regression Model and SHAP","authors":"Keito Nishida, Ryuto Shigenobu, Akiko Takahashi, Masakazu Ito, Hisao Taoka, Norikazu Kanao, Hitoshi Sugimoto","doi":"10.1002/eej.23510","DOIUrl":"https://doi.org/10.1002/eej.23510","url":null,"abstract":"<div>\u0000 \u0000 <p>Electric power systems with increasing photovoltaic (PV) systems face concerns regarding degradation in frequency stability due to heightened output forecast errors. As a countermeasure, given the dynamic factors like demand, PV output, and meteorological elements, calculating the optimal reserve margin (ORM) becomes crucial for economic efficiency and resilience reinforcement. To ensure an efficient ORM, Artificial Intelligence (AI) is one of the useful strategies used to analyze the combination of all the elements. However, AI is characterized by a black box problem, and to achieve transparency, AI needs to be transformed into explainable AI. To begin with, this paper analyzed all features importance using SHapley Additive exPlanations (SHAP), adopting a Gaussian process regression model. Then, relevant explanatory variables were selected to improve the prediction accuracy of the ORM. Finally, to verify the effectiveness, this paper planned day-ahead scheduling while securing the ORM determined by the proposed method. It executed detailed demand/supply and system frequency simulations as an operation. The proposed method decreased the risk posed by PV output forecast errors and shortage of reserve margin. Also, the maximum PV capacity increased from 96.2% to 166.2% while maintaining frequency stability.</p>\u0000 </div>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"218 2","pages":""},"PeriodicalIF":0.4,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144220421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cavitation Detection Method for Pumps Based on Motor Current Signature Analysis 基于电机电流特征分析的泵气蚀检测方法

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2025-05-28 DOI: 10.1002/eej.23508

Yasuhiro Kamino, Makoto Kanemaru, Ryotaro Shinozuka, Tomoyuki Iwawaki, Ken Hirakida, Koji Irikiin, Toshihiko Miyauchi

引用次数: 0

A Proposal of the Improved Method for Measuring Insulation Resistance Between a Photovoltaic Module String and the Earth Using the Self-Biased Method 自偏置法测量光伏组件串与地间绝缘电阻的改进方法

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2025-05-10 DOI: 10.1002/eej.23505

Takuro Kazama, Kazuhiko Kato

引用次数: 0

Protein Synthesis via in vitro Transcription and Translation System inside Monodisperse Vesicles Fabricated by Microfluidics 微流体制备单分散小泡内体外转录和翻译系统的蛋白质合成

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2025-05-10 DOI: 10.1002/eej.23512

Satoshi Nanjo, Mamiko Tsugane, Tomoaki Matsuura, Hiroaki Suzuki

引用次数: 0

Liver Microphysiological System for Drug-Induced Liver Injury (DILI) Evaluation Based on Kinetic Pump Integrated Microfluidic Plate (KIM-Plate) 基于动能泵集成微流控板（KIM-Plate）的药物性肝损伤（DILI）评价微生理系统

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2025-05-09 DOI: 10.1002/eej.23513

Kenta Shinha, Hiroko Nakamura, Masaki Nishikawa, Yasuyuki Sakai, Hiroshi Kimura

{"title":"Liver Microphysiological System for Drug-Induced Liver Injury (DILI) Evaluation Based on Kinetic Pump Integrated Microfluidic Plate (KIM-Plate)","authors":"Kenta Shinha, Hiroko Nakamura, Masaki Nishikawa, Yasuyuki Sakai, Hiroshi Kimura","doi":"10.1002/eej.23513","DOIUrl":"https://doi.org/10.1002/eej.23513","url":null,"abstract":"<div>\u0000 \u0000 <p>Prediction of the risk of developing Drug-induced liver injury (DILI) is very important in drug discovery. Although animal tests usually evaluate DILI, the prediction accuracy of DILI is low because experimental animals have different metabolic pathways from humans. A few microphysiological systems (MPS) have been developed as novel evaluation systems for DILI evaluation. However, the proposed system is not yet practical due to operability, throughput issues, and prediction accuracy. Our purpose is to develop a practical DILI evaluation system. In this study, we investigate the influence of perfusion culture on hepatotoxicity tests using our previously developed Kinetic pump integrated microfluidic plate (KIM-Plate). The results of acetaminophen toxicity tests showed that perfusion culture using KIM-Plate improved the detection sensitivity of hepatotoxicity. We suggest that the liver model MPS based on KIM-Plate could be a novel DILI evaluation system that integrates highly functional liver models and coculture with immune cells.</p>\u0000 </div>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"218 2","pages":""},"PeriodicalIF":0.4,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144220353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of a New Unit Commitment Method With Quantum Predator Prey Brain Storm Optimization 基于量子“捕食者-猎物”头脑风暴优化的单元承诺新方法的发展

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2025-05-08 DOI: 10.1002/eej.23509

Yusuke Kawauchi, Hiroyuki Mori, Hsiao-Dong Chiang

引用次数: 0

Proposal of the Rocking Electric Power Generator Using Pendulum Mechanism for ICT Applications in the Fisheries Industry 渔业信息通信技术应用中钟摆摆动发电机的设计方案

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2025-05-05 DOI: 10.1002/eej.23507

Nobumasa Nishiyama, Seito Hamaguchi, Takato Ishino, Kouichi Kamada, Tsukasa Kitahara

{"title":"Proposal of the Rocking Electric Power Generator Using Pendulum Mechanism for ICT Applications in the Fisheries Industry","authors":"Nobumasa Nishiyama, Seito Hamaguchi, Takato Ishino, Kouichi Kamada, Tsukasa Kitahara","doi":"10.1002/eej.23507","DOIUrl":"https://doi.org/10.1002/eej.23507","url":null,"abstract":"<div>\u0000 \u0000 <p>To introduce ICT to the fisheries industry, it is important to secure a power supply. To supplement solar power generation at night, on rainy days, and on cloudy days, we have devised a rocking electric power generator that generates electricity from the rocking motion of waves. We report on the building up a rocking electric power generator. The generator can generate electricity by a rocking motion. It achieved to 1.28 VA rotational speed of 0.78 rps, and the maximum output current is 40 mA. The load resistance is available at 240 Ω or more. We clarified the relationship between rocking motion and power generation in a rocking power generator, using evaluation sensors each of motion and electricity. As a result of increasing the power generation efficiency of the air gap generator, the load current also flows to the coil, which causes the electromagnetic brake to work more strongly. Due to the influence of the electromagnetic brake, it was not possible to increase the generated voltage. It was found that a driving torque by the pendulum load was required that exceeded the braking force produced by the electromagnetic brake. To increase the pendulum load, the float becomes to lose its balance because the center of gravity becomes higher. The relationship between the pendulum load and balance is important for stable levitation.</p>\u0000 </div>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"218 2","pages":""},"PeriodicalIF":0.4,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144220194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental Verification of the Switching Loss Reduction Effect and Characteristic Fluctuation of SiC MOSFETs Dependent on Gate Drive Voltage 基于栅极驱动电压的SiC mosfet开关损耗降低效果及特性波动的实验验证

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2025-05-02 DOI: 10.1002/eej.23514

Takahide Sagae, Shin-Ichiro Hayashi, Keiji Wada

{"title":"Experimental Verification of the Switching Loss Reduction Effect and Characteristic Fluctuation of SiC MOSFETs Dependent on Gate Drive Voltage","authors":"Takahide Sagae, Shin-Ichiro Hayashi, Keiji Wada","doi":"10.1002/eej.23514","DOIUrl":"https://doi.org/10.1002/eej.23514","url":null,"abstract":"<div>\u0000 \u0000 <p>The switching frequency of silicon carbide (SiC) metal–oxide–semiconductor field-effect transistors (MOSFETs) should be increased to maximize their benefits in power conversion circuits. However, the switching loss increases when the switching frequency is increased. Generally, the gate resistance is designed to be small to reduce the switching loss for one cycle. However, SiC MOSFETs have a higher parasitic gate resistance than Si power devices. This paper proposes reducing the switching losses by “overdriving” the SiC MOSFETs, in which the gate voltage <i>V</i>g is designed to be higher than the rated gate–source voltage of the SiC MOSFET. The relationship between gate voltage <i>V</i>g and switching loss is clarified both theoretically and experimentally. Additionally, the effect of “overdrive” on the long-term reliability of SiC MOSFETs is evaluated by conducting continuous switching tests. The results show that “overdrive” can maximize the benefits of SiC MOSFETs based on the expected lifetime of the power conversion circuit.</p>\u0000 </div>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"218 2","pages":""},"PeriodicalIF":0.4,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144220115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Method for Suppressing Gate Voltage Oscillations in Magnetically Coupled Gate Drives for Series-Connected Power Semiconductor Devices 抑制串联功率半导体器件磁耦合栅极驱动器中栅极电压振荡的方法

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2025-04-30 DOI: 10.1002/eej.23511

Takahiro Urakabe, Taiki Kanda, Makoto Hagiwara, Yusuke Higaki, Yuki Itogawa

引用次数: 0

Section Locating of Water-Tree Degraded Cable by Measuring Residual Charges Induced by Induced Voltage Pulses 通过测量感应电压脉冲产生的剩余电荷对水树退化电缆进行截面定位

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2025-04-27 DOI: 10.1002/eej.23506

Koki Watanabe, Tatsuya Sakoda, Akira Takahashi, Naoyuki Negishi, Kazunori Miyazaki

引用次数: 0