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Fast short-circuit protection under current imbalance condition for multi-paralleled SiC-MOSFETs 多并联SiC MOSFET在电流不平衡条件下的快速短路保护
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2023-06-05 DOI: 10.1002/eej.23429
Hiroshi Suzuki, Tsuyoshi Funaki
{"title":"Fast short-circuit protection under current imbalance condition for multi-paralleled SiC-MOSFETs","authors":"Hiroshi Suzuki,&nbsp;Tsuyoshi Funaki","doi":"10.1002/eej.23429","DOIUrl":"https://doi.org/10.1002/eej.23429","url":null,"abstract":"<p>This paper proposes methodology and gate drive circuit that can immediately detect short-circuit (SC) of multiparalleled SiC-MOSFETs even under current imbalance condition. Proposed method detects SC current using an integration circuit that can sense <i>di</i>/<i>dt</i>. The detection level of SC current can be adjusted to a desired value regardless of the number of SiC-MOSFETs connected in parallel. The effectiveness of the proposed approach was experimentally validated for four-paralleled SiC-MOSFETs under extreme current imbalance in SC condition. SC was detected within 0.5 μs and all SiC-MOSFETs were protected without destruction at most 2.2 μs after the onset of SC, for all types of SC 1, 2, and 3.</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":"50121883","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
Basic study on calibration using waveform variation in space charge measurement by pulsed electroacoustic method 脉冲电声法测量空间电荷波形变化校准的基础研究
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2023-06-05 DOI: 10.1002/eej.23436
Xiaoxin Li, Tomohiro Kawashima, Yoshinobu Murakami, Naohiro Hozumi
{"title":"Basic study on calibration using waveform variation in space charge measurement by pulsed electroacoustic method","authors":"Xiaoxin Li,&nbsp;Tomohiro Kawashima,&nbsp;Yoshinobu Murakami,&nbsp;Naohiro Hozumi","doi":"10.1002/eej.23436","DOIUrl":"https://doi.org/10.1002/eej.23436","url":null,"abstract":"<p>The pulsed electroacoustic method determines the distribution of space charge in an insulation system by applying a pulse voltage and detecting the acoustic response. It estimates the location and magnitude of charges from time-domain signals. For quantitative analysis, a bias voltage is applied to a specimen with no space charge, and the acoustic signal generated from the electrodes only is used as a reference waveform for calibration. However, a full-scale, extra-high voltage insulation system often already contains space charges in it. Therefore, a method of acquiring a reference signal under such a condition was studied. We studied methods to compare voltage variations and response signal variations. We proposed a method that measures the signal difference at different voltages. In addition, we proposed a method of correlating voltage and signal variations that may allo for more rapid signal acquisition. The feasibility was proved using an 11 mm-thick mimic polyethylene specimen.</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":"50121881","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
Common mode conductive noise cancellation for multiphase converter using auxiliary winding 基于辅助绕组的多相变换器共模传导噪声消除
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2023-06-03 DOI: 10.1002/eej.23439
Mamoru Sasaki, Jun Imaoka, Masayoshi Yamamoto, Akira Nakano, Koji Fuse
{"title":"Common mode conductive noise cancellation for multiphase converter using auxiliary winding","authors":"Mamoru Sasaki,&nbsp;Jun Imaoka,&nbsp;Masayoshi Yamamoto,&nbsp;Akira Nakano,&nbsp;Koji Fuse","doi":"10.1002/eej.23439","DOIUrl":"https://doi.org/10.1002/eej.23439","url":null,"abstract":"<p>A multiphase DC-DC converter consisting of a coupled inductor and fast switching devices enables power electronics equipment to achieve a high-power density. However, with such devices, the fast voltage transition generates substantial common mode (CM) noise. However, there are very few studies on CM noise reduction for multiphase converters using a coupled inductor. Therefore, in this paper, a CM noise reduction method is proposed for a multiphase DC-DC converter that hardly lowers the power density.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 2","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50119281","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 fault cause estimation method for distribution line 配电线路故障原因估计方法的发展
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2023-02-26 DOI: 10.1002/eej.23414
Yoshikazu Iida, Masato Hirai, Masato Shiga, Tetsushi Ono, Tatsuki Inuzuka
{"title":"Development of fault cause estimation method for distribution line","authors":"Yoshikazu Iida,&nbsp;Masato Hirai,&nbsp;Masato Shiga,&nbsp;Tetsushi Ono,&nbsp;Tatsuki Inuzuka","doi":"10.1002/eej.23414","DOIUrl":"https://doi.org/10.1002/eej.23414","url":null,"abstract":"<p>We are planning to develop the new Advanced Distribution Automation System (ADAS) equipped with optical communication network and sectionalizer with sensor for more grid reliability and efficiency on maintenance operation. The new system is featured with the function of fault cause or damaged part estimation. The new sectionalizer captures the waveform of electrical line surge originated by fault and the system analyzes the waveform for this function. This paper mainly introduces the system configuration of ADAS and an early stage examination of fault cause estimation technology.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50145132","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 energy saving operation technology for punctuality and ride comfort by optimizing the point of target pattern recreation 通过优化目标模式娱乐点开发准时性和乘坐舒适性的节能操作技术
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2023-02-16 DOI: 10.1002/eej.23417
Yuhi Tsutsumi, Atsushi Oda, Keiji Maekawa
{"title":"Development of energy saving operation technology for punctuality and ride comfort by optimizing the point of target pattern recreation","authors":"Yuhi Tsutsumi,&nbsp;Atsushi Oda,&nbsp;Keiji Maekawa","doi":"10.1002/eej.23417","DOIUrl":"https://doi.org/10.1002/eej.23417","url":null,"abstract":"<p>At present, there is a growing demand for energy saving to prevent global warming. Thus, the railway industry is also focusing on energy saving methods. Power consumption of running trains has a large variation of approximately 20% caused by drivers’ operation. Therefore, improving the running profile can considerably reduce energy consumption. Numerous algorithms for generating energy saving running profiles have been researched and developed. To adapt energy saving operation to various environments, we developed a technology that maintains punctuality without reducing the energy efficiency when temporary differences occur in driving conditions. We propose a method that determines the re-creation command point to complete the re-creation at the switching point of the driving operation in the existing energy-saving target pattern, to achieve both punctuality and ride comfort. As a result of verifying the effect of the proposed method on the conventional method via a simulation, it was confirmed that the proposed method can prevent the increase in the number of operation changes when the driving conditions change, whereas the conventional method increases the number of operation changes.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50134493","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 on improving shielding performance of shielded cable 提高屏蔽电缆屏蔽性能的研究
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2023-02-14 DOI: 10.1002/eej.23420
Takashi Tsuchida
{"title":"A study on improving shielding performance of shielded cable","authors":"Takashi Tsuchida","doi":"10.1002/eej.23420","DOIUrl":"https://doi.org/10.1002/eej.23420","url":null,"abstract":"<p>With the developments in power electronics equipment, the electromagnetic environment has become severe for electronic equipment. In the smart facility field, the stable operation of electronic devices is indispensable, and noise countermeasures must be improved. To suppress intrusive noise from cables, shielded cables are used in many cases. However, electromagnetic induction cannot be suppressed when the shield is grounded at one end, and when grounding both ends of the shield, current flows through the shield creating intrusive noise in the cable. That is, even if a shielded cable is used, a sufficient effect cannot be obtained. Therefore, as a countermeasure, this study prototypes and evaluates cables that combine double shielded cables with magnetic cores. Evaluations conducted using the copper pipe method, triaxial method, and impulse test confirm that the shielded performance improved by 10–30 dB compared with the conventional shielded cable.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50150669","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
Fundamental study for assessment of surface resistivity based on waveform characteristics of partial discharge 基于局部放电波形特征评估表面电阻率的基础研究
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2023-02-08 DOI: 10.1002/eej.23418
Tomohiro Kawashima, Taisuke Hirukawa, Kanta Yoshikawa, Yoshinobu Murakami, Naohiro Hozumi
{"title":"Fundamental study for assessment of surface resistivity based on waveform characteristics of partial discharge","authors":"Tomohiro Kawashima,&nbsp;Taisuke Hirukawa,&nbsp;Kanta Yoshikawa,&nbsp;Yoshinobu Murakami,&nbsp;Naohiro Hozumi","doi":"10.1002/eej.23418","DOIUrl":"https://doi.org/10.1002/eej.23418","url":null,"abstract":"<p>The partial discharge (PD) waveform reflects the evolution process of electron avalanche in the discharge space. The authors expect to estimate the condition of the discharge space based on the PD waveform characteristics. The semi-conductive sheet was attached to the insulator to simulate the decrease in surface resistance due to deterioration. With the reduction of the surface resistivity, the shoulder appeared on the rising part of the PD waveform and the rise time of the PD waveform became longer. In addition, we simulated the change in the rise time using an equivalent circuit model. The displacement current was calculated from the surface potential distribution estimated by the diffusion equation, and the PD current was simulated by summing up all the current components. As a result, the shoulder was reproduced at the rising part of the PD waveform in the simulation as well. The surface resistance was estimated from the PD waveform by fitting with the experimental results.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50139651","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
Real-time supply-demand schedule update and operation for generators and battery energy storage system based on forecasted and actual photovoltaic power outputs 基于预测和实际光伏发电量，实时更新发电机和电池储能系统的供需计划和运行
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2023-02-08 DOI: 10.1002/eej.23416
Taisei Yoshioka, Koji Nishio, Kohei Takahashi, Taisuke Masuta, Rajitha Udawalpola, Hideaki Ohtake
{"title":"Real-time supply-demand schedule update and operation for generators and battery energy storage system based on forecasted and actual photovoltaic power outputs","authors":"Taisei Yoshioka,&nbsp;Koji Nishio,&nbsp;Kohei Takahashi,&nbsp;Taisuke Masuta,&nbsp;Rajitha Udawalpola,&nbsp;Hideaki Ohtake","doi":"10.1002/eej.23416","DOIUrl":"https://doi.org/10.1002/eej.23416","url":null,"abstract":"<p>The photovoltaic (PV) power output might be frequently curtailed to maintain electricity supply-demand balance in future power systems. In our previous study, we proposed a new method for updating the battery energy storage system (BESS) charge/discharge and the generator unit commitment (UC) schedules based on the forecasted and actual PV power outputs. The forecast dataset was updated every 3 h (eight times a day). Although the simulation results showed that the proposed method could reduce the supply-demand imbalances, it was not clear whether the forecasted or actual values made contributions. Therefore, in this study, we propose and evaluate a real-time scheduling and operation method using the forecasted and actual PV power outputs assuming that the forecasted dataset is updated only once a day. Numerical simulations of supply-demand operations are conducted on the power system model of the Kanto area of Japan for one year. The results show that the previous study method has a slight advantage over proposed method in terms of curtailed PV energy and operational cost of thermal generators reduction, but the difference is very small, indicating that the contribution of the actual PV power outputs is greater than that of the forecasted PV power outputs.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50139652","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
Effects of a small amount of H2O on negative ion mobility and ion-molecule reactions in O2 at atmospheric pressure 大气压下少量H2O对O2中负离子迁移率和离子分子反应的影响
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2023-02-07 DOI: 10.1002/eej.23413
Yui Okuyama, Yuka Yasuzawa, Hirotake Sugawara
{"title":"Effects of a small amount of H2O on negative ion mobility and ion-molecule reactions in O2 at atmospheric pressure","authors":"Yui Okuyama,&nbsp;Yuka Yasuzawa,&nbsp;Hirotake Sugawara","doi":"10.1002/eej.23413","DOIUrl":"https://doi.org/10.1002/eej.23413","url":null,"abstract":"<p>In this study, we have measured the negative ion mobility in O<sub>2</sub> at high pressures with a little amount of H<sub>2</sub>O concentration between 15 and 17,000 ppb. After that, we carried out a Monte Carlo simulation using mobility of electrons, that of the ions obtained in the measurements, and rate coefficients of ion-molecule reactions. As a result, the mobility value 2.39 cm<sup>2</sup>/V·s of O<sub>4</sub>¯ is obtained in ultrahigh purity O<sub>2</sub> of which the H<sub>2</sub>O concentration is between 15 and 100 ppb. Moreover, the mobility decreases with the H<sub>2</sub>O concentrations at which the ion species are considered to be O<sub>2</sub>¯·(H<sub>2</sub>O)<i><sub>n</sub></i> (<i><sub>n</sub></i> = 1, 2, 3). Then, we compared the experimental result with that of the simulation and estimated the ion mobility and rate coefficients of ion molecule reactions. Simulation results using estimated values of the ion mobility and rate coefficients agree well with measurement results.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50123640","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
Scheduling method for aggregated photovoltaic-battery systems considering information notified by distribution system operator 考虑配电系统运营商通知信息的聚合光伏电池系统调度方法
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2023-02-07 DOI: 10.1002/eej.23419
Fumiya Hyodo, Yuki Sato, Taisuke Masuta, Thavatchai Tayjasanant
{"title":"Scheduling method for aggregated photovoltaic-battery systems considering information notified by distribution system operator","authors":"Fumiya Hyodo,&nbsp;Yuki Sato,&nbsp;Taisuke Masuta,&nbsp;Thavatchai Tayjasanant","doi":"10.1002/eej.23419","DOIUrl":"https://doi.org/10.1002/eej.23419","url":null,"abstract":"<p>In recent years, the aggregation business has gained a lot of attention in Japan. Aggregators will make contracts with customers with photovoltaic (PV) power systems and battery energy storage systems (BESSs) including electric vehicles (EVs) to participate in electricity markets. Aggregators might have to pay electricity supply-demand imbalance charges when generated and consumed energies contracted at the day-ahead supply-demand market are different from those at the current day operation due to distribution network constraints such as voltage and power flow limitations. Therefore, the information on network constraints is very important for aggregators to determine their day-ahead schedules. In this paper, we evaluated the relationship between aggregator supply-demand schedules and the distribution system operation. It was assumed that the reverse power flow limitations due to network constraints are notified to the aggregators by distribution system operator (DSO). Two cases of the aggregators’ schedules of PV systems and stationary BESSs were compared in the simulations. In addition, aggregator strategies for making adequate schedules were evaluated.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50136523","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
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