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The high-frequency phenomenon of copper clad aluminum wires which are lower the alternating current resistance than copper solid wires, and the application of copper clad aluminum wires to the electrical equipment 交流电阻比铜实心线低的铜包铝线的高频现象，以及铜包铝丝在电气设备中的应用
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2023-06-22 DOI: 10.1002/eej.23435
Katsuhiko Ueda, Chefen Hung
{"title":"The high-frequency phenomenon of copper clad aluminum wires which are lower the alternating current resistance than copper solid wires, and the application of copper clad aluminum wires to the electrical equipment","authors":"Katsuhiko Ueda,&nbsp;Chefen Hung","doi":"10.1002/eej.23435","DOIUrl":"https://doi.org/10.1002/eej.23435","url":null,"abstract":"<p>The paper is proposed approximate formulas of the ac resistance of lead wires and coils which made by using copper clad aluminum (CCA) wires. There are the frequency range that the ac resistance of CCA wires is lower than it of cupper solid wires for lead wires and coils of an electrical equipment. It is shown that the application of CCA wires is economical as comparing with copper solid wires, if the design is due to successful calculation in the electrical equipment. The measured resistance is compared with the formula. CCA wires is an example of multiple conductors which shall be expected to apply in future.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 3","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50140970","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
Area day-ahead photovoltaic power prediction by just-in-time modeling with meso-scale ensemble prediction system 基于中尺度集成预测系统的实时建模区域日前光伏发电量预测
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2023-06-13 DOI: 10.1002/eej.23426
Yusuke Mori, Shinji Wakao, Hideaki Ohtake, Takahiro Takamatsu, Takashi Oozeki
{"title":"Area day-ahead photovoltaic power prediction by just-in-time modeling with meso-scale ensemble prediction system","authors":"Yusuke Mori,&nbsp;Shinji Wakao,&nbsp;Hideaki Ohtake,&nbsp;Takahiro Takamatsu,&nbsp;Takashi Oozeki","doi":"10.1002/eej.23426","DOIUrl":"https://doi.org/10.1002/eej.23426","url":null,"abstract":"<p>Photovoltaics (PV) output prediction, which is indispensable for power system operation, can affects demand and supply adjustment adversely when large prediction error occurs. Thus, the reduction of large error as well as average error is required in PV power prediction. In 2019, the operation of the Meso-scale Ensemble Prediction System (MEPS) of numerical weather prediction started from the JapanMeteorological Agency, and the amount of forecasting information would be potentially useful for the improvement of PV power prediction. However, very few studies on inputting multiple meteorological elements of the MEPS have been reported. In this paper, we newly develop the prediction model for an area day-ahead PV power output composed of Just-In-Time Modeling (JIT Modeling) with multiple elements of theMEPS. The developed method achieves precise forecasts with low computational load by both selecting meteorological elements valid for improving prediction accuracy and adequately devising the structure of JIT Modeling. Some numerical examples demonstrating the effectiveness of the developed method are also presented. In particular, the proposed method reduces large error significantly.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 3","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50131402","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: 1
Development of a short-term solar irradiance forecasting using satellite image in combination with numerical weather prediction model 利用卫星图像和数值天气预报模型开发短期太阳辐照度预报
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2023-06-12 DOI: 10.1002/eej.23432
Atsushi Hashimoto, Katsuhisa Yoshimoto
{"title":"Development of a short-term solar irradiance forecasting using satellite image in combination with numerical weather prediction model","authors":"Atsushi Hashimoto,&nbsp;Katsuhisa Yoshimoto","doi":"10.1002/eej.23432","DOIUrl":"https://doi.org/10.1002/eej.23432","url":null,"abstract":"<p>A short-term solar irradiance forecasting method has been developed to provide highly accurate prediction, using satellite image prediction model in combination with numerical weather prediction model. This method was applied and evaluated using the solar irradiance observational site at the CRIEPI Akagi Testing Center (Gunma Prefecture, Japan). Based on historical forecasting and observation datasets at JMA observation sites in the computational domain, the best blending ratio between the satellite image prediction model and the numerical weather prediction model was selected and used. The developed method has shown high accuracy. Compared to satellite image forecasting, accuracy results averaged between three and 6 h of lead-time showed improvements in the RMSE by 44% for the before-sunrise case, 20% for the after-sunrise case, and 8% for the noon to sunset case.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 3","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50149964","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 novel method applicable to large-scale active magnetic shielding system which effectively compensates gradient magnetic fields originated from the surrounding buildings 一种适用于大型主动磁屏蔽系统的新方法，可有效补偿周围建筑物产生的梯度磁场
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2023-06-10 DOI: 10.1002/eej.23433
Takuto Ogata, Naofumi Murata, Takafumi Shimizu
{"title":"A novel method applicable to large-scale active magnetic shielding system which effectively compensates gradient magnetic fields originated from the surrounding buildings","authors":"Takuto Ogata,&nbsp;Naofumi Murata,&nbsp;Takafumi Shimizu","doi":"10.1002/eej.23433","DOIUrl":"https://doi.org/10.1002/eej.23433","url":null,"abstract":"<p>We propose the novel magnetic compensation method which is suitable to compensate gradient magnetic fields. The method is to be applied to a conventional large-scale, tri-axial active magnetic shielding system such as a spacecraft magnetic testing facility. The essences of this method are the adoption of compensation coils which have degrees of freedom in their coil orientations, and their installation position, which is chosen to have certain distances from the center of the shielding area. The method works with at least four compensation coils. In this research, we actually demonstrated the method with a scaled-down experiment. Disturbance magnetic field (B) at the target zone was suppressed from 21.33 nT to −1.54 nT and magnetic field uniformity (ΔB) within the test zone was improved from 2.3 nT to 0.015 nT. In terms of magnetic field gradient, improvement from over 4 nT/m to below 0.5 nT/m was achieved.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 3","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50127924","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 capacitive-coupled hall-type MHD generator 电容耦合霍尔型磁流体发电机的研制
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2023-06-09 DOI: 10.1002/eej.23440
Gaigo Kato, Kazumasa Takahashi, Takashi Kikuchi, Toru Sasaki
{"title":"Development of capacitive-coupled hall-type MHD generator","authors":"Gaigo Kato,&nbsp;Kazumasa Takahashi,&nbsp;Takashi Kikuchi,&nbsp;Toru Sasaki","doi":"10.1002/eej.23440","DOIUrl":"https://doi.org/10.1002/eej.23440","url":null,"abstract":"<p>We have demonstrated a capacitively coupled Hall-type MHD generator using ECR plasma. To clarify the characteristics of the fabricated MHD generator, we measured the power generation characteristics as a function of magnetic field strength using a DC Hall-type MHD power generation experiment. The results showed that the output power decreased due to magnetic pressure at the higher magnetic field. However, the output power corresponded to the theoretical value at the lower magnetic field. An AC Hall-type MHD power generation experiment was conducted using an AC magnetic field. As a result, full-wave rectification voltage was observed as per theory. Finally, capacitively coupled Hall-type MHD power generation experiments were conducted, and full-wave rectified waveforms were observed as in AC Hall-type MHD power generation. These waveforms were similar to the output waveforms predicted from theory. These results show that the capacitively coupled Hall-type MHD generator is feasible.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 3","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50126427","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: 1
MHz-driven snubberless zero-current soft-switching high step-up DC-DC converter with a multi-resonant tank MHz驱动的无缓冲零电流软开关多谐振储能高升压DC-DC转换器
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2023-06-07 DOI: 10.1002/eej.23425
Tomokazu Mishima, Ryusei Miyazaki, Ching-Ming Lai
{"title":"MHz-driven snubberless zero-current soft-switching high step-up DC-DC converter with a multi-resonant tank","authors":"Tomokazu Mishima,&nbsp;Ryusei Miyazaki,&nbsp;Ching-Ming Lai","doi":"10.1002/eej.23425","DOIUrl":"https://doi.org/10.1002/eej.23425","url":null,"abstract":"<p>A novel high step-up DC-DC converter suitable for the power interface of fuel cells (FC) is presented in this paper. The proposed converter features a multi-resonant tank for achieving high-step up ratio under zero current soft switching (ZCS) without any snubber circuits. The simple and minimized-component topology is beneficial for megahertz driving of gallium nitride (GaN) power transistors with effective reductions of switching loss, electromagnetic emission interference (EMI) noise, and ripple-free DC input current. Mode-transitional power stages are described in detail, following that the high step-up principle is revealed by means of frequency-domain analysis. The essential performances of the proposed circuit topology are demonstrated by simulation and experiment of 1.8 MHz-120W prototype whereby effectiveness of the snubberless and multi-resonant topology are verified from the practical point of view.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 3","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50123993","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
Spatio-temporal distributions of accumulated charge density in atmospheric pressure dielectric barrier discharges 大气压介质阻挡放电中累积电荷密度的时空分布
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2023-06-06 DOI: 10.1002/eej.23434
Haruaki Akashi, Tomokazu Yoshinaga
{"title":"Spatio-temporal distributions of accumulated charge density in atmospheric pressure dielectric barrier discharges","authors":"Haruaki Akashi,&nbsp;Tomokazu Yoshinaga","doi":"10.1002/eej.23434","DOIUrl":"https://doi.org/10.1002/eej.23434","url":null,"abstract":"<p>The effect of the secondary electron emission coefficient on accumulated charge density distributions in atmospheric pressure dielectric barrier discharges have been simulated using two-dimensional fluid model. Spatio-temporal distributions of accumulated charge density on each side of the dielectric have been examined. The differences of conventional waveforms of accumulated charge density and the simulated results were clarified. And when the dielectrics were negatively accumulated, charges were uniformly accumulated, while positive charges were not. Randomness of streamers' occurrence, and self-organized structures have been also examined by the accumulated charge distributions.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 2","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50134024","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 self-conducting current bypass circuit for series-connected diodes in high power semiconductor light source 大功率半导体光源串联二极管自导通电流旁路电路的研制
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2023-06-06 DOI: 10.1002/eej.23427
Hiroyasu Iwabuki, Taichiro Tamida, Akihiko Iwata, Shigeo Morimoto
{"title":"Development of self-conducting current bypass circuit for series-connected diodes in high power semiconductor light source","authors":"Hiroyasu Iwabuki,&nbsp;Taichiro Tamida,&nbsp;Akihiko Iwata,&nbsp;Shigeo Morimoto","doi":"10.1002/eej.23427","DOIUrl":"https://doi.org/10.1002/eej.23427","url":null,"abstract":"<p>This paper proposes a self-conducting current bypass circuit for series-connected diodes in high power semiconductor light source. This circuit enables the main circuit current flow continuously, even if several of the diodes connected in series are open because of breakdowns. Herein, the composition, operation, and circuit design method of the proposed circuit are described. Moreover, the development of a simulation model of the fuse, which is an element of the circuit, is described. Furthermore, the simulation result of the proposed circuit using the fuse model is presented, and the method of determining the circuit constant based on the simulation result is demonstrated. Finally, by connecting a prototype circuit based on this study in parallel with series-connected diodes, we show that the main circuit current of 60 A flow continuously even when one of the diodes is open.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 2","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50134025","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
Design of a linearization model for three-phase PWM rectifiers for electrochemical machining 用于电化学加工的三相PWM整流器的线性化模型设计
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2023-06-06 DOI: 10.1002/eej.23428
Atsushi Nakata, Akihiro Goto, Suguru Mototani, Akihiro Torii
{"title":"Design of a linearization model for three-phase PWM rectifiers for electrochemical machining","authors":"Atsushi Nakata,&nbsp;Akihiro Goto,&nbsp;Suguru Mototani,&nbsp;Akihiro Torii","doi":"10.1002/eej.23428","DOIUrl":"https://doi.org/10.1002/eej.23428","url":null,"abstract":"<p>Electrochemical machining (ECM) is a processing method for metals that uses a DC power supply and flowing electrolyte. In some cases, discharge occurs during ECM when the gap between the electrode and workpiece, whose distance is rather small, is filled with hydrogen generated via electrolysis. We attempt to utilize a DC inductor placed between the DC supply and the ECM load in order to limit di/dt of the short or discharge current, which damages both the electrode and workpiece. When the output current surges, that is, when discharge occurs, the output voltage is suppressed by the DC inductance. In this paper, we propose a method for designing a PWM rectifier to reduce the discharge current, establish a linear approximation model for use in the PWM rectifier, describe a control method of the PWM rectifier, and demonstrate the efficacy of the model via simulations and experiments.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 2","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50134026","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
Purely resistive load estimation for three-phase inverter by using pseudo random binary sequence signal 基于伪随机二进制序列信号的三相逆变器纯电阻负载估计
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2023-06-05 DOI: 10.1002/eej.23438
Masataka Minami, Naoya Morinaka
{"title":"Purely resistive load estimation for three-phase inverter by using pseudo random binary sequence signal","authors":"Masataka Minami,&nbsp;Naoya Morinaka","doi":"10.1002/eej.23438","DOIUrl":"https://doi.org/10.1002/eej.23438","url":null,"abstract":"<p>In recent years, the introduction of photovoltaic power generation systems has been increasing from the perspective of global warming countermeasures. However, there is a problem that it becomes difficult to adjust the supply and demand balance of electric power. Therefore, in this research, the inverter by using estimation signal estimates the load of the consumer, then we aim to adjust the supply-demand balance at the demand side. By the verification of experimental, three-phase inverter, which is assumed to be an industrial photovoltaic power generation system, estimates the load by using pseudo random binary sequence (PRBS) signal and two proposed methods. The load estimation results show that the error rate of the estimated resistance of each phase is within a few percent by using the two proposed methods, and the load estimation is achieved.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 2","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50121882","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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