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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
Improvement in output power of vibration generators based on piezoelectric elements by using internal capacitor cancel control rectifier 利用内部电容抵消控制整流器提高压电元件振动发生器的输出功率
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2023-02-05 DOI: 10.1002/eej.23415
Masataka Minami, Akito Nakagaki, Genki Hase
{"title":"Improvement in output power of vibration generators based on piezoelectric elements by using internal capacitor cancel control rectifier","authors":"Masataka Minami,&nbsp;Akito Nakagaki,&nbsp;Genki Hase","doi":"10.1002/eej.23415","DOIUrl":"https://doi.org/10.1002/eej.23415","url":null,"abstract":"<p>Recently, energy harvesting has attracted increasing attention. The present study focuses on vibration generators based on piezoelectric elements by proposing an internal capacitor cancel control (ICCC) rectifier to improve the output power. The proposed rectifier cancels the internal capacitor to improve the output power while retaining the maximum output power. Accordingly, this paper experimentally demonstrates the improvement in output power by using the ICCC rectifier compared to conventional circuits and the previous proposed circuit.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50130076","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
Modeling of I-V characteristics for crystalline silicon photovoltaic modules based on a simplified equivalent circuit and a temperature correction 基于简化等效电路和温度校正的晶体硅光伏组件I-V特性建模
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2022-11-21 DOI: 10.1002/eej.23410
Yuki Ohnishi, Yasuhito Takahashi, Koji Fujiwara, Kazuyuki Hidaka, Hiroshi Morita
{"title":"Modeling of I-V characteristics for crystalline silicon photovoltaic modules based on a simplified equivalent circuit and a temperature correction","authors":"Yuki Ohnishi,&nbsp;Yasuhito Takahashi,&nbsp;Koji Fujiwara,&nbsp;Kazuyuki Hidaka,&nbsp;Hiroshi Morita","doi":"10.1002/eej.23410","DOIUrl":"10.1002/eej.23410","url":null,"abstract":"<p>Electric power generated by photovoltaic (PV) systems is generally unstable because of uncertain meteorological conditions. Stably maintaining the supply-demand balance of power systems requires an accurate prediction of the performance of PV systems. Especially for predicting the performance of the PV systems containing modules with different electrical characteristics or installed in different angles, it is necessary to calculate the generated power of the system by combining the current-voltage (<i>I</i>-<i>V</i>) characteristics of each module in series and parallel. Therefore, an accurate method is required for estimating the <i>I</i>-<i>V</i> characteristics in various meteorological conditions. In this paper, a simple modeling method of the <i>I</i>-<i>V</i> characteristics for crystalline silicon PV modules is proposed. The <i>I</i>-<i>V</i> characteristics can be simulated in a good accuracy for practical use based on a simplified equivalent circuit of PV modules and a temperature correction of the short-circuit current, open-circuit voltage, and the current and voltage at maximum power point. The validity of the proposed method is examined by comparing simulated and measured <i>I</i>-<i>V</i> characteristics of a PV module. Furthermore, to demonstrate the effectiveness of the proposed modelling method, it was applied to simulating the power generation of a PV system containing modules installed in different angles.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"215 4","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91068489","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 the reciprocating airflow generator for wave power generator and study on the vertical axis turbine characteristics in reciprocating airflow 波浪发电机组往复气流发生器的研制及垂直轴水轮机在往复气流中的特性研究
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2022-10-25 DOI: 10.1002/eej.23405
Kentaro Tsuji, Mitsuhiro Shiono
{"title":"Development of the reciprocating airflow generator for wave power generator and study on the vertical axis turbine characteristics in reciprocating airflow","authors":"Kentaro Tsuji,&nbsp;Mitsuhiro Shiono","doi":"10.1002/eej.23405","DOIUrl":"10.1002/eej.23405","url":null,"abstract":"<p>Renewable energy is attracting attention as an alternative to current mainstream power generator sources. One source of renewable energy is wave energy. We devised a simulator for the OWC-type wave power generator and developed a reciprocating airflow generator is generated reciprocating airflow by using the reciprocating motion of a piston. This piston motion was achieved by converting the rotational motion of the motor into linear motion of the ball screw via gears. Furthermore, we used a vertical axis turbine with arc camber blades and studied on the turbine characteristics. Owing to the reciprocation of the piston, a substantially sinusoidal reciprocating airflow was generated in the measurement section. It was confirmed that a reciprocating airflow speed was generated for all the target values. A load characteristic test of the turbine was conducted. It was confirmed that the maximum turbine output was 1.60 W.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"215 4","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89075187","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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