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Proposal of angle detection method for concentrated winding bearingless motors with less magnetic interference due to current 针对电流磁场干扰较小的集中绕组无轴承电机的角度检测方法建议
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2024-05-22 DOI: 10.1002/eej.23468
Masahito Miyoshi, Yuichiro Nakamura, Shinichi Furutani, Keita Kajino, Hiroya Sugimoto
{"title":"Proposal of angle detection method for concentrated winding bearingless motors with less magnetic interference due to current","authors":"Masahito Miyoshi,&nbsp;Yuichiro Nakamura,&nbsp;Shinichi Furutani,&nbsp;Keita Kajino,&nbsp;Hiroya Sugimoto","doi":"10.1002/eej.23468","DOIUrl":"10.1002/eej.23468","url":null,"abstract":"<p>This paper proposes a method for detecting the angle of a bearingless motor with less magnetic interference due to the current. Bearingless motors have suspension windings and motor windings that generate leakage flux. Owing to this electromagnetic phenomenon, the signal of the linear Hall-effect sensor for angle detection is disturbed, and it has to be avoided to place Hall sensors near the winding conventionally. To solve this interference problem, this paper clarifies the ideal combinations between sensor positions and the number of poles and slots of concentrated winding bearingless motors.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"217 2","pages":""},"PeriodicalIF":0.4,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141109279","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
Demonstration of application of redox flow battery for securing demand-supply reserve power and improvement of grid resiliency 示范应用氧化还原液流电池确保供需储备电力和提高电网韧性
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2024-05-22 DOI: 10.1002/eej.23467
Eitaro Omine, Shinichi Murakami, Nobuhiko Kusunose, Riichi Kitano, Toshio Ooka, Toshikazu Shibata
{"title":"Demonstration of application of redox flow battery for securing demand-supply reserve power and improvement of grid resiliency","authors":"Eitaro Omine,&nbsp;Shinichi Murakami,&nbsp;Nobuhiko Kusunose,&nbsp;Riichi Kitano,&nbsp;Toshio Ooka,&nbsp;Toshikazu Shibata","doi":"10.1002/eej.23467","DOIUrl":"10.1002/eej.23467","url":null,"abstract":"<p>In order to achieve net-zero carbon emissions by introducing enormous amount of renewable energy, it is essential to secure the reserve power to improve the power quality of the grid. On the other hand, improvement of the grid resiliency is also needed in case of emergency such as outage of the grid. The energy storage system can be the solution for both of securing the reserve power and improving grid resiliency. The authors have conducted demonstration project to validate the applicability of Redox Flow (RF) battery for securing the reserve power and improving grid resiliency. The results of the demonstration validated that the RF battery makes it possible to be used as reserve power and earn revenue through energy and ancillary market transactions during normal operations, in addition to providing power to blackout areas or the areas that outages are assumed, as an independent power source, during an emergency such as natural disasters and planned outages.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"217 2","pages":""},"PeriodicalIF":0.4,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141109810","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 maintenance scheduling method for power generators considering large penetration of variable renewable energy sources and system inertia 考虑大量可再生能源渗透和系统惯性，开发发电机维护调度方法
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2024-05-21 DOI: 10.1002/eej.23465
Shuhei Segawa, Kazuhiko Ogimoto, Hitoshi Azuma, Akira Isonaga, Suguru Fukutome
{"title":"Development of a maintenance scheduling method for power generators considering large penetration of variable renewable energy sources and system inertia","authors":"Shuhei Segawa,&nbsp;Kazuhiko Ogimoto,&nbsp;Hitoshi Azuma,&nbsp;Akira Isonaga,&nbsp;Suguru Fukutome","doi":"10.1002/eej.23465","DOIUrl":"10.1002/eej.23465","url":null,"abstract":"<p>Conventional methods to schedule power generators maintenance aim to secure enough supply reserve margin to the power system when its power generators have to go under maintenance. However, the use of such methods in scenarios of large penetration of VRE, might be problematic. This is because in such scenarios conventional scheduling methods might inadvertently concentrate maintenance operations when residual demand is particularly low, creating situations in which there is insufficient supply-demand balancing capability and inertia to operate the power system properly. In this study, we present the development of a new method to schedule generator maintenance that ensure inertia and balancing capability constraints, and show its effectiveness.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"217 2","pages":""},"PeriodicalIF":0.4,"publicationDate":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141148591","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 isolation power circuit for transformer-less AC fed electric vehicles 无变压器交流馈电电动汽车隔离电源电路的实验验证
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2024-05-21 DOI: 10.1002/eej.23473
Tenko Fukuda, Tsuyoshi Funaki
{"title":"Experimental verification of isolation power circuit for transformer-less AC fed electric vehicles","authors":"Tenko Fukuda,&nbsp;Tsuyoshi Funaki","doi":"10.1002/eej.23473","DOIUrl":"10.1002/eej.23473","url":null,"abstract":"<p>This study aimed to develop a power supply system without a traction transformer for weight reduction and downsizing. Transformer-less power supply is expected to realize step-down, rectification, isolation, and motor drive using a high-voltage silicon carbide power device. The primary challenge of this study was developing a novel circuit that isolates the motor drive circuit from the AC line without using the traction transformer. Accordingly, we devised a flying capacitor circuit to solve the existing problems and achieve capacitive isolation. Subsequently, we devised a nesting capacitor as a short-circuit prevention measure. In this study, the operation of the isolated circuit was verified by numerical simulation, complemented by experimental verification of the proposed circuit.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"217 2","pages":""},"PeriodicalIF":0.4,"publicationDate":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141118222","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 reference stator flux linkage calculation method for realizing maximum efficiency operation in direct-torque-controlled IPMSM drives 实现直接转矩控制 IPMSM 驱动器最高效率运行的参考定子磁通联动计算方法
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2024-05-20 DOI: 10.1002/eej.23472
Atsushi Shinohara, Takato Maemura, Kichiro Yamamoto
{"title":"A reference stator flux linkage calculation method for realizing maximum efficiency operation in direct-torque-controlled IPMSM drives","authors":"Atsushi Shinohara,&nbsp;Takato Maemura,&nbsp;Kichiro Yamamoto","doi":"10.1002/eej.23472","DOIUrl":"10.1002/eej.23472","url":null,"abstract":"<p>In this paper, a reference stator flux linkage calculation method is proposed for realizing maximum efficiency operation in direct-torque-controlled interior permanent magnet synchronous motor (IPMSM) drives. The proposed method is based on the solutions of a quartic equation, a motor model in the <i>d-q</i> rotating frame widely used for synchronous motor controllers, and a well-known equation for maximum efficiency operation. Therefore, the proposed method uses neither any approximation function nor any look-up table that depends on the parameters of the motor, which has to be created in advance. Simulation results validate that the proposed methods can achieve maximum efficiency operation in IPMSM drives.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"217 2","pages":""},"PeriodicalIF":0.4,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141148597","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
An experimental study on fire ignition in collector cable in wind power generation system caused by direct lightning strike 风力发电系统集电电缆遭直接雷击起火的实验研究
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2024-02-23 DOI: 10.1002/eej.23462
Ken-ichi Seki, Takashi Tsuchida, Atsushi Akiba, Hiroyuki Tada, Shozo Sekioka
{"title":"An experimental study on fire ignition in collector cable in wind power generation system caused by direct lightning strike","authors":"Ken-ichi Seki,&nbsp;Takashi Tsuchida,&nbsp;Atsushi Akiba,&nbsp;Hiroyuki Tada,&nbsp;Shozo Sekioka","doi":"10.1002/eej.23462","DOIUrl":"10.1002/eej.23462","url":null,"abstract":"<p>A separable connector is used for the power cables and apparatuses in renewable energy systems. The shield of the collector cable is sometimes an open circuit at one end to reduce power loss due to the shield current. However, this has a disadvantage from the viewpoint of lightning protection. The semiconductive part of the separable connector is grounded for safety. The ground potential rise due to a direct lightning strike to a wind tower sometimes damages the collector cables and power apparatuses in the wind tower. Combustion in a cable is one of the most serious types of lightning-caused damage. This paper describes an experimental study on fire ignition in a collector cable caused by a ground potential rise due to a direct lightning strike to a receptor. The mechanism leading to fire ignition is discussed based on the experimental results. This paper also proposes a countermeasure against such fire ignition.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"217 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139950498","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
Analysis of high-frequency electromagnetic ringing phenomenon under GaN-FET inverter excitation GaN-FET 逆变器激励下的高频电磁振铃现象分析
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2024-02-20 DOI: 10.1002/eej.23464
Norihiro Ogishima, Nguyen Gia Minh Thao, Keisuke Fujisaki
{"title":"Analysis of high-frequency electromagnetic ringing phenomenon under GaN-FET inverter excitation","authors":"Norihiro Ogishima,&nbsp;Nguyen Gia Minh Thao,&nbsp;Keisuke Fujisaki","doi":"10.1002/eej.23464","DOIUrl":"10.1002/eej.23464","url":null,"abstract":"<p>In this study, the ringing phenomenon of gallium nitride-field effect transistor (GaN-FET) and silicon-insulated gate bipolar transistor (Si-IGBT) inverter excitations in a ring sample was thoroughly measured and analyzed by using a high-quality oscilloscope with a very high sampling rate of 5 giga-samples per second (GS/s). Owing to the rapid switching of the GaN-FET power devices in several nanoseconds and the ringing frequencies in the MHz range, the use of the high sampling rate of 5 GS/s is necessary and useful for accurate measurement. The experimental findings and analysis reveal the following three key points: (i) there are two possible types of high-frequency resonance phenomena, that is, the first one caused by semiconductor devices and circuits and the other generated by the resonance with loads in use. (ii) The ringing phenomenon because of the resonance under the load is considered to be due to the rising time of pulses that are caused by the rapid switching of the semiconductor devices. (iii) The ability to measure and the two types of ringing phenomena depends on the intensity of the white noise of the measuring instrument</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"217 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139928246","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
Circuit equation in power superimposition for position sensor using single-phase transformer on PMSM power lines 在 PMSM 电源线上使用单相变压器的位置传感器功率叠加电路方程
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2024-02-15 DOI: 10.1002/eej.23459
Takeshi Kiribuchi, Yukinori Inoue, Shigeo Morimoto
{"title":"Circuit equation in power superimposition for position sensor using single-phase transformer on PMSM power lines","authors":"Takeshi Kiribuchi,&nbsp;Yukinori Inoue,&nbsp;Shigeo Morimoto","doi":"10.1002/eej.23459","DOIUrl":"10.1002/eej.23459","url":null,"abstract":"<p>Permanent magnet synchronous motors (PMSM) are very popular in the industrial market. Recently, robots are installed to compensate for the shortage of labor. Due to the increase in motors, the number of power lines and position sensor cable wiring are increased; this increase in complicated wiring is a problem. As a method to solve these problems, power superimposition technology in the power line of a PMSM is expected to reduce the distribution cables. In this paper, the power superposition technology method, and circuit equations of mounting transformers in power lines are presented and are then verified by experiment, simulation, and linear analysis. The circuit equation is proposed as a three-phase circuit equation, which is transformed into a dq-circuit equation by a transformation matrix. The characteristics of the electric angular frequency versus the dq-axis voltage demonstrated satisfactory results, with errors within 1% in linear analysis and simulation. The linear analysis and experiment are shown to be similar, although there are some errors. The validity of the circuit equations could be demonstrated by the verification results.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"217 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139758105","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
Fault current limiter principle by switching magnetic circuit 开关磁路故障电流限制器原理
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2024-02-14 DOI: 10.1002/eej.23463
Mitsuru Tsukima, Yamato Hatauchi
{"title":"Fault current limiter principle by switching magnetic circuit","authors":"Mitsuru Tsukima,&nbsp;Yamato Hatauchi","doi":"10.1002/eej.23463","DOIUrl":"10.1002/eej.23463","url":null,"abstract":"<p>Several types of fault current limiters have been studied so far, including superconductor based one or nonsuperconductor based one. However, it is difficult to satisfy all requirements for cost, maintainability, and current limiting performance. This study proposes another type of fault current limiter, variable transformer based one. It is supposed to be less expensive and easier to be maintained since it is based on the conventional transformer, and to be expected better current limiting performance since the magnetic circuit of the transformer is drastically changed. The magnetic circuit of the transformer is switched to be opened and to produce another one by shifting a portion of its iron core mechanically, allowing the primary and secondary electric circuit to be magnetically isolated. In that way, the electromotive force of the secondary winding could be reduced so that the secondary current could be limited. The prototype based on this concept was designed and built up, and its stational performance has been investigated. As a result, it was confirmed that the prototype shows good current limiting performances identical to the results of the previous FE analysis. Furthermore, the prototype was connected to the operating mechanism to investigate the transient performances, and as a result, satisfying current limiting performances are confirmed</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"217 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139928045","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 event-based centralized excitation control method of synchronous generators for improving the transient stability 开发基于事件的同步发电机集中励磁控制方法以提高暂态稳定性
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2024-02-14 DOI: 10.1002/eej.23458
Fumichika Yamaoka, Kenichi Kawabe
{"title":"Development of event-based centralized excitation control method of synchronous generators for improving the transient stability","authors":"Fumichika Yamaoka,&nbsp;Kenichi Kawabe","doi":"10.1002/eej.23458","DOIUrl":"10.1002/eej.23458","url":null,"abstract":"<p>Maintenance of transient stability is important for the stable operation of power systems. However, as a large amount of renewable energy sources are concerned that the transient stability deteriorates. Excitation control systems have been widely used to improve the transient stability. The defect is that only the synchronous generator (SG) near the fault location changes the excitation voltage so much immediately after the fault. In this study, we propose a novel excitation control method based on an event-based wide-area emergency control system. In this method, the SGs that are distant from the fault location play a role to mitigate the first swing as well as the SGs near the fault. The effectiveness of the proposed method is verified demonstrated by numerical simulation for a multi-machine test system</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"217 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139758103","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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