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Operation of a Dc/3ϕ power converter using a single-delta bridge-cell converter under low magnetizing inductance 在低磁化电感下，使用单δ桥胞变换器的Dc/3ϕ功率变换器的操作
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2022-09-01 DOI: 10.1002/eej.23398
Kento Okumura, Makoto Hagiwara
{"title":"Operation of a Dc/3ϕ power converter using a single-delta bridge-cell converter under low magnetizing inductance","authors":"Kento Okumura, Makoto Hagiwara","doi":"10.1002/eej.23398","DOIUrl":"10.1002/eej.23398","url":null,"abstract":"A single‐delta bridge‐cell converter (hereinafter referred to as an SDBC converter) is a prospective power converter for a static synchronous compensator (STATCOM). The authors have proposed a dc/3ϕ power converter using the SDBC converter and a medium‐frequency single‐phase transformer with an operating frequency of 150 Hz; this converter can exchange a maximum active power of 37% of the rated reactive power with three‐phase ac mains supply without increasing the voltage and current ratings of the SDBC converter. In particular, the negative‐sequence reactive power control is a challenging task because of the high magnetizing inductance of the transformer. To achieve the negative‐sequence reactive power control, a single‐phase transformer with low magnetizing inductance is applied to the converter at the expense of the exchangeable active and reactive power. The relationship of the magnetizing inductance, active power, and reactive power is revealed in this paper, and the operation of the converter under low magnetizing inductance is experimentally verified by employing a downscaled 110‐V, 7‐kVA model.","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"215 3","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82752148","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
Efficient autonomous feedback controller parameter design considering robust stability for galvanometer scanner 考虑振镜扫描仪鲁棒稳定性的高效自主反馈控制器参数设计
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2022-08-31 DOI: 10.1002/eej.23391
Eitaro Kuroda, Yoshihiro Maeda, Makoto Iwasaki
{"title":"Efficient autonomous feedback controller parameter design considering robust stability for galvanometer scanner","authors":"Eitaro Kuroda,&nbsp;Yoshihiro Maeda,&nbsp;Makoto Iwasaki","doi":"10.1002/eej.23391","DOIUrl":"10.1002/eej.23391","url":null,"abstract":"<p>Robust stable feedback (FB) controller design against plant perturbation is crucial for industrial servo systems. However, since the controller parameter design generally requires expert skills and/or considerable labor by engineers, an autonomous controller design technology would be promising. This paper presents an efficient autonomous design method that optimizes the parameters of a cascade structure FB controller to achieve robust stabilization. Conventionally, robust stabilization is realized by imposing stability constraints on all the perturbed plant model sets in a parameter optimization problem. As a result, the design time would be much longer owing to the complicated optimization problem. The proposed method makes the parameter optimization considering robust stability more efficient than the conventional method, by simplifying the stability constraint definition and optimizing the specified circle radius for the stability constraint based on a bisection method. The effectiveness of the proposed method is evaluated through an example FB controller design for a laboratory galvanometer scanner.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"215 3","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86132778","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
Automated technique for building high-frequency equivalent circuits of motors based on electromagnetic field analysis 基于电磁场分析的电机高频等效电路自动化构建技术
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2022-08-31 DOI: 10.1002/eej.23395
Kohji Maki
{"title":"Automated technique for building high-frequency equivalent circuits of motors based on electromagnetic field analysis","authors":"Kohji Maki","doi":"10.1002/eej.23395","DOIUrl":"10.1002/eej.23395","url":null,"abstract":"<p>To estimate in advance the high-frequency impedance of a motor, and its internal voltage distribution when an inverter surge is applied, a technique to derive the circuit constants of various parts of a motor based on electromagnetic field analysis and build its high-frequency equivalent circuit, where each turn of the coils is separately modeled, has been developed. By switching between 2D and 3D analyses and between 1-slot and 1-pole models to accelerate the calculation method and by automating them in parallel, the developed technique even enables non-experts to build an accurate high-frequency equivalent circuit of a motor. Based on the accuracy verification, the shared voltage of coils can be estimated with an error of 20% or less by considering the frequency characteristics of the resistance and inductance of each turn of the coils and modeling a lead wire in the measurement setup.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"215 3","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86497248","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
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
{"title":"A study of odor reproduction using multi-component olfactory display","authors":"Masaaki Iseki,&nbsp;Dani Prasetyawan,&nbsp;Yasufumi Yokoshiki,&nbsp;Takamichi Nakamoto","doi":"10.1002/eej.23392","DOIUrl":"10.1002/eej.23392","url":null,"abstract":"<p>A sensory test experiment (triangle difference test) was conducted using the 20-component olfactory display to confirm odor reproduction based on odor components. The essential oils used were lemon, palmarosa, carrot seed, elemi, lavender, cypress and mentha arvensis. Each one was selected from seven essential oil categories. The sensory test reveals that it was difficult to distinguish between the reproduced odor and the target one. Thus, the odor reproduction by olfactory display based on odor components was generally possible. Furthermore, we found that the participants used its features or intensities as clues to distinguish between the blended odor and the target one from a survey of the free comments on the questionnaire sheets.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"215 3","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84967060","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
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,&nbsp;Hiroyuki Amano","doi":"10.1002/eej.23393","DOIUrl":"10.1002/eej.23393","url":null,"abstract":"<p>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.</p>","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
{"title":"Efficiency characteristics for changes in amplitude and power factor of diode-clamped linear amplifier unequally divided voltage power supply","authors":"Junnosuke Haruna,&nbsp;Yusuke Matano,&nbsp;Hirohito Funato","doi":"10.1002/eej.23389","DOIUrl":"10.1002/eej.23389","url":null,"abstract":"<p>A diode-clamped linear amplifier (DCLA) is proposed to realize low electromagnetic interference (EMI) caused by switching operations. A new concept of the DCLA, namely the higher efficiency unequally divided voltage power supply DCLA (DCLA-UeDV), is proposed. In previous studies, the optimal voltage ratio was derived, and a 1.7% points improvement in efficiency was realized for a rated unity power factor load. However, it has not been examined whether the conversion efficiency can be improved, except during the rated operation. In this study, operation of the DCLA is analyzed for changes in the amplitude of the output voltage and load power factor. Then, the advantageous operating region of the DCLA-UeDV against DCLA-eDV is clarified.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"215 3","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88451092","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 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":"<p>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.</p>","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,&nbsp;Akio Sanpei,&nbsp;Sadao Masamune","doi":"10.1002/eej.23377","DOIUrl":"10.1002/eej.23377","url":null,"abstract":"<p>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 <i>m</i>/<i>n </i>= 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 <i>m</i>/<i>n </i>= 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.</p>","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
{"title":"Numerical prediction on arc characteristics for various polymer materials during polymer-ablated arc ignition process","authors":"Yusuke Nakano,&nbsp;Yasunori Tanaka,&nbsp;Tatsuo Ishijima,&nbsp;Daiki Nagai,&nbsp;Kentaro Inenaga","doi":"10.1002/eej.23373","DOIUrl":"10.1002/eej.23373","url":null,"abstract":"<p>Characteristics of ignition process of polymer-ablated arc with different current values were investigated with electromagnetic thermofluid analysis. This thermofluid simulation is based on calculated particle composition, thermodynamic and transport properties of evaporated vapor of polymer material and electrode material. Polymer ablation was assumed to occur by heat flux from the arc plasma. The initiation of polymer ablation was studied for different polymer materials because polymer ablation can affect arc behavior and then arc interruption ability. Results showed that it took time of milli- to tens milliseconds to initiate polymer ablation, and that its initiation time decreases with increasing current.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"215 2","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79393804","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 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
{"title":"Development of energy evaluation system during manual operation using train simulator","authors":"Shoichiro Watanabe,&nbsp;Tomonori Hasegawa,&nbsp;Daisuke Yamaguchi,&nbsp;Takashi Oshitate","doi":"10.1002/eej.23380","DOIUrl":"10.1002/eej.23380","url":null,"abstract":"<p>The electric railway is an environment-friendly transportation system. An energy-saving operation with a low cost and high energy-saving efficiency is often considered to further decrease energy consumption. An Automatic Train Operation (ATO) system has the advantage of energy-saving because a train can be controlled by an on-board computer. However, many railway lines are still being operated by drivers and controlled via manual operation in addition, energy managements often become difficult for drivers and operators. Therefore, a study of energy-saving manual operation is desired. Energy verification of a manual operation is difficult because an adequate experiment has several constraints and trial periods are limited. Moreover, it requires a considerable amount of time and effort. In this study, an energy evaluation system is developed to calculate the energy consumed by a train when a driver manually operates it through adding an advanced calculation device to a conventional railway simulator. Consequently, the evaluation system contributes to carry out simple experiments with a short duration.</p>","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":"90143659","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
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