Electrical Engineering in Japan最新文献_第9页

A study of odor reproduction using multi-component olfactory display 利用多组分嗅觉显示器进行气味再现的研究

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2022-08-31 DOI: 10.1002/eej.23392

Masaaki Iseki, Dani Prasetyawan, Yasufumi Yokoshiki, Takamichi Nakamoto

引用次数: 2

Mechanism of control instability of control function installed to grid-following inverter and development of damping controller for stable operation 随网逆变器控制功能的控制不稳定机理及稳定运行阻尼控制器的研制

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2022-08-27 DOI: 10.1002/eej.23393

Keisuke Shirasaki, Hiroyuki Amano

{"title":"Mechanism of control instability of control function installed to grid-following inverter and development of damping controller for stable operation","authors":"Keisuke Shirasaki, Hiroyuki Amano","doi":"10.1002/eej.23393","DOIUrl":"10.1002/eej.23393","url":null,"abstract":"Conventional synchronous generators have been replaced by renewable energy source such as photovoltaics generation and wind turbine generation interconnected through inverters. As the capacity of synchronous generators interconnected to the power system decrease, the power system stability can be gradually jeopardized. Therefore, these inverters may be required to have some control functions in grid-interconnection code to support power system stabilization. On the other hand, it is known that the response of some control functions become unstable and undesired oscillatory behavior appears depending on the power system conditions such as low short circuit ratio. In consequence, not only the expected power system stabilization is not obtained, but also the power quality may be degraded. In this paper, the mechanism of these instabilities is clarified by using a simplified root mean square model, and a damping controller applicable to grid-following (GFL) inverter is developed. It is shown that the damping of the oscillatory behavior could be improved by applying the proposed controller using eigenvalue analysis and time domain simulation. This contribution is useful for the appropriate operation of the control function installed to GFL inverter.","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"215 3","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80883433","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

Efficiency characteristics for changes in amplitude and power factor of diode-clamped linear amplifier unequally divided voltage power supply 二极管箝位线性放大器不等分电压电源幅值和功率因数变化的效率特性

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2022-08-26 DOI: 10.1002/eej.23389

Junnosuke Haruna, Yusuke Matano, Hirohito Funato

引用次数: 0

Development of a reversible transformer model for the calculation of inrush currents energizing from higher and lower voltage windings 建立了一种可逆变压器模型，用于计算高、低压绕组励磁涌流

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2022-03-08 DOI: 10.1002/eej.23365

Rikido Yonezawa

{"title":"Development of a reversible transformer model for the calculation of inrush currents energizing from higher and lower voltage windings","authors":"Rikido Yonezawa","doi":"10.1002/eej.23365","DOIUrl":"10.1002/eej.23365","url":null,"abstract":"Transformers are normally energized from the higher voltage winding. In power system restoration, however, they may be energized from the lower voltage winding. Therefore, a reversible transformer model that is able to accurately calculate inrush currents and some other low-frequency transients is required regardless of which winding is energized. Although a reversible transformer model based on a topology-based model that considers magnetic couplings between phases has been proposed, it is difficult to determine the parameters of the model because iron-core and winding design information are not available in most cases. In addition, the approximation of the design information required when such information is not available does not always hold accurately. In this article, a reversible transformer model that can be composed only from available information such as nameplates and test reports, without using the design information (or the approximation), by using mutually coupled magnetic resistances has been developed. As a result of verification using a 500 VA single-phase three-winding transformer, it is indicated that the inrush currents calculated by the developed model are in good agreement with those obtained by the laboratory measurements using the test transformer regardless of which winding is energized.","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"215 2","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89622184","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

Stabilization of resistive wall mode and improved plasma performance in a low-aspect-ratio reversed field pinch by a single mode control power supply system 单模控制电源系统在低宽高比反向场箝位下稳定电阻壁模式和改善等离子体性能

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2022-03-06 DOI: 10.1002/eej.23377

Tomoyuki Nagano, Akio Sanpei, Sadao Masamune

{"title":"Stabilization of resistive wall mode and improved plasma performance in a low-aspect-ratio reversed field pinch by a single mode control power supply system","authors":"Tomoyuki Nagano, Akio Sanpei, Sadao Masamune","doi":"10.1002/eej.23377","DOIUrl":"10.1002/eej.23377","url":null,"abstract":"Stabilization of resistive wall modes (RWMs) is one of the important issues in magnetic fusion research. In the reversed field pinch (RFP), the number of unstable RWMs becomes smaller by lowering the aspect ratio (A), the ratio of the minor to major radius of the device. In REversed field pinch of Low-Aspect ratio eXperiment (RELAX), whose aspect ratio is 2, unstable m/n = 1/2 RWM was stabilized by a single mode control power supply system with improvements of discharge performance. In this paper we report new results with modified power supply system in which magnetic boundary condition near the poloidal gaps is controlled. The modified power supply system is designed to stabilize the most unstable m/n = 1/2 mode by use of the saddle coil array covering the whole torus with eight (8) power supplies. The results show that the discharge duration is improved from ~ 3.0 ms to ~ 4.0 ms, limited by the capability of the iron core in RELAX device. Stabilization of the dominant RWM with the resultant improved plasma performance by a single mode control power supply system shows one of the advantages of a low-aspect-ratio RFP concepts.","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"215 2","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76409436","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

Numerical prediction on arc characteristics for various polymer materials during polymer-ablated arc ignition process 高分子材料烧蚀电弧点火过程电弧特性的数值预测

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2022-03-04 DOI: 10.1002/eej.23373

Yusuke Nakano, Yasunori Tanaka, Tatsuo Ishijima, Daiki Nagai, Kentaro Inenaga

引用次数: 0

Development of energy evaluation system during manual operation using train simulator 利用列车模拟器开发人工操作能量评估系统

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2022-03-02 DOI: 10.1002/eej.23380

Shoichiro Watanabe, Tomonori Hasegawa, Daisuke Yamaguchi, Takashi Oshitate

引用次数: 0

Development of a method for calculating the transmission-line constants of cables installed in a rectangular tunnel 建立了矩形隧道中电缆传输在线常数的计算方法

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2022-03-02 DOI: 10.1002/eej.23378

Yohei Tanaka, Rikido Yonezawa, Taku Noda

{"title":"Development of a method for calculating the transmission-line constants of cables installed in a rectangular tunnel","authors":"Yohei Tanaka, Rikido Yonezawa, Taku Noda","doi":"10.1002/eej.23378","DOIUrl":"10.1002/eej.23378","url":null,"abstract":"Accurately calculating the transmission-line constants of underground cables is important for various types of power system simulations such as electromagnetic transient, power flow, and transient stability simulations. The transmission line constants of cables installed in a tunnel must be calculated taking the skin and proximity effects into account, since the cables are spaced closely to each other and also to a wall face of the tunnel. However, the conventional method, which is capable of considering the skin and proximity effects, has been restricted to circular cross-section conductors such as cables and a circular tunnel. Therefore, the method cannot handle a tunnel with a rectangular cross section. In this paper, a method for calculating the transmission-line constants of a conductor system in which both circular and rectangular cross-section conductors present in the same space is proposed. Then, the walls of a rectangular tunnel are represented by eight rectangular conductors, and cables represented by circular conductors are placed inside the eight rectangular conductors. In this paper, the proposed method is verified by experiments using a conductor system in which three circular conductors are arranged in a rectangular conductor. Calculated results obtained by the proposed method agree well with the measured results.","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"215 2","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88251329","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: 2

A proposal of a new gradient driver with a gradational voltage inverter for low power loss 一种新型低功耗梯度变频器的设计方案

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2022-03-02 DOI: 10.1002/eej.23363

Masayuki Oishi, Ryosuke Kobayashi, Tomokazu Sakashita

引用次数: 1

Design of a contact-force controller including airframe's velocity and acceleration feedback controllers for one-degree-of-freedom propeller-driven systems 一自由度螺旋桨驱动系统中包含机身速度和加速度反馈控制器的接触力控制器的设计

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2022-03-02 DOI: 10.1002/eej.23379

Yuki Nishii, Daisuke Yashiro, Kazuhiro Yubai, Satoshi Komada

引用次数: 0