著者

飯坂 達也 松井 哲郎 福山 良和

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.124, no.3, pp.347-354, 2004 (Released:2004-06-01)

参考文献数

22

被引用文献数

8 13

---

This paper presents a daily peak load forecasting method using an analyzable structured neural network (ASNN) in order to explain forecasting reasons. In this paper, we propose a new training method for ASNN in order to explain forecasting reason more properly than the conventional training method. ASNN consists of two types of hidden units. One type of hidden units has connecting weights between the hidden units and only one group of related input units. Another one has connecting weights between the hidden units and all input units. The former type of hidden units allows to explain forecasting reasons. The latter type of hidden units ensures the forecasting performance. The proposed training method make the former type of hidden units train only independent relations between the input factors and output, and make the latter type of hidden units train only complicated interactions between input factors. The effectiveness of the proposed neural network is shown using actual daily peak load. ASNN trained by the proposed method can explain forecasting reasons more properly than ASNN trained by the conventional method. Moreover, the proposed neural network can forecast daily peak load more accurately than conventional neural network trained by the back propagation algorithm.

著者

浅井 晋也 島田 元生

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.115, no.8, pp.865-868, 1995-07-20 (Released:2008-12-19)

参考文献数

5

被引用文献数

1

著者

山岡 勝 長谷川 淳

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.114, no.11, pp.1091-1098, 1994-10-20 (Released:2008-12-19)

参考文献数

10

---

Theoreticl study and phenomenal examination have been done for a long time, but some electric power company even today has instataneou power failure due to the galloping. Our study differs from other ones on the point that non-linear three dimentional simultaneous equations of conductor movement can be solved directly using numerical calculation. Foundamental characteristcs of galloping can be made clear by that calculation changing parameters variously. This time, we used the method that bundle conductor are changed equivalently to single conductor. We could also make it clear that instable domain becomes wider when rotational movement of conductor occurs.

著者

西嶋 茂宏 秋山 庸子

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.135, no.10, pp.579-582, 2015-10-01 (Released:2015-10-01)

参考文献数

7

---

A large amount of radionuclides were spread by the accident of Fukushima Daiichi nuclear power plant in 2011. The situation of surrounding area of nuclear power plant is momentarily changing. In order to consider for decontamination or volume reduction of radioactive wastes, it is necessary taking into account not only the technical needs but also feelings of inhabitants, reduction of environmental load, reduction of the radiation exposure on workers and efficiency and cost of decontamination work. In this paper, the application possibility of superconducting magnetic separation system for decontamination and volume reduction was discussed compared with other technologies from above multidirectional viewpoint.

著者

相原 良太 横山 明彦

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.135, no.3, pp.141-152, 2015 (Released:2015-03-01)

参考文献数

13

被引用文献数

1 3

---

In recent years, a large amount of photovoltaic (PV) generations have been installed in power systems. However, the power output from the PVs is random and intermittent in nature. Therefore, the PV generations pose many challenges to the power system operation. To estimate the impact of these issues on the power system operation, we propose optimal weekly demand and supply simulation method considering a large penetration of photovoltaic generations. In this paper, a study for operation scheduling method considering optimal hot reserve capacity is presented. The effectiveness of the proposed method is shown by using Monte Carlo simulation.

著者

中村 光一 河崎 善一郎

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.113, no.8, pp.839-844, 1993-08-20 (Released:2008-12-19)

参考文献数

23

著者

西澤 侑吾

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.134, no.3, pp.NL3_3-NL3_5, 2014-03-01 (Released:2014-03-01)

参考文献数

3

---

高機能な高温超電導体であるBi系高温超電導ウィスカーを電磁石に応用することができると,省スペース・低コストで且つ強力な電磁石を実現することができる。しかしながら,流すことのできる最大の電流密度が,印加される磁場の角度によって極端に変化してしまうという問題点(Jc - θ依存性)が存在し,この応用の妨げとなっている。本研究では,この問題を解決するためにBi系高温超電導ウィスカーへMgを添加した。これにより,Jc - θ依存性を約1/7へ改善することに成功した。

著者

柳橋 健 前田 隆文 江村 徳男 筏 達也 原田 豊司

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.114, no.7-8, pp.800-806, 1994-07-20 (Released:2008-12-19)

参考文献数

5

---

The power capacitor and the AC filter are used for the reliable supply of electric power. For the protection of the power capacitor system, the over-load relay must be very accurate, because the operating voltage in power system is nearly the limited level of the power capacitor. For the protection of the AC filter system, the effective value must be detected from the filtercurrent which is mixed of fundamental and harmonics. So, we developed and produced the relay systems using new algorithms, high rate sampling, digital filter, R.M. S. calculation. On this paper, we report the characteristic of the protections and the algorithms.

著者

椎名 健雄 宮島 清富 椙本 一登 松野 秀明

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.142, no.11, pp.568-569, 2022-11-01 (Released:2022-11-01)

参考文献数

6

---

DC magnetic fields under the Hida-Shinano 200kV DC overhead transmission line were assessed by measurements. The DC magnetic fields observed under the DC overhead transmission line are a superposition of the geomagnetic field and that generated by the DC line current. In this study, the DC magnetic fields generated by the transmission line were obtained by a vector subtraction of the geomagnetic field from the total DC magnetic field. The measured geomagnetic field was 47.1μT and the assessed magnetic fields from the line with a current of 2250A were from 3.8μT to 8.3μT depending on the operating condition of the DC transmission line.

著者

若井 武夫 松本 安弘 佐久間 治 新庄 一雄 本山 英器

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.114, no.5, pp.545-546, 1994-05-20 (Released:2008-12-19)

参考文献数

2

著者

松本 安弘 佐久間 治 新庄 一雄 谷口 弘光 杉本 仁志 酒井 勉

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.116, no.1, pp.122-123, 1995-12-20 (Released:2008-12-19)

参考文献数

1

被引用文献数

1

著者

本田 敦夫 手塚 孔一郎 岡村 智仁 河本 薫 清水 翔司 原田 耕平 田辺 隆人 白川 達也 高橋 智洋

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.138, no.11, pp.862-873, 2018-11-01 (Released:2018-11-01)

参考文献数

23

被引用文献数

1

---

Osaka Gas Co., Ltd., jointly with NTT DATA Mathematical Systems Inc., has developed unit-commitment model for optimizing dispatch of power generation units. Main purpose of this development is to simulate the future world of electric power system in accordance with national energy policy aiming to introduce large amount of renewable energy as well as vitalized cross-border power exchange via PX market to enhance economically-efficient power system operation. The model incorporates not only constraints of supply-demand balance but also constraints of operating reserves, regulation reserves, maximum CO2-emissions, etc.

著者

石井 勝 小山 博

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.114, no.1, pp.91-97, 1994-01-20 (Released:2008-12-19)

参考文献数

5

被引用文献数

2 2

---

Intercomparison tests of dividers for lightning impulse measurement were carried out Japan participated by 12 laboratories. Two resistive dividers, one with 300 kV rating and the other with 1 MV rating, were circulated among the laboratories. The comparison test is one of the methods for checking the uncertainty of a high voltage measuring system, and is proposed in the course of the revision of an IEC standard to incorporate a new idea, that is, the traceability of the uncertainty in high voltage measuring systems. This paper reports on the determination of the scale factor, evaluation of the unit step response parameters and the comparison tests with lightning impulse voltages at about 100 kV. It is demonstrated that the participating 12 laboratories are all capable of realizing the idea in the revision of the IEC standard, that is, to establish traceability. On the other hand, a few problems to be solved in the testing procedures are found, to reduce the scatter in the measured parameters in these tests.

著者

太田 豊

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.138, no.9, pp.753-756, 2018-09-01 (Released:2018-09-01)

参考文献数

12

被引用文献数

3 6

---

Sales of electric vehicle are rapidly growing in worldwide. Vehicle grid integration is important for mitigating impact of charging demand on the distribution feeders, realizing renewable powered charging from the rooftop photovoltaic and wind power generation, and contributing to the Vehicle-to-Grid ancillary services for the power systems. This paper reviews current trends of the vehicle grid integration R&D. Future prospective is also pointed out on the key issues such as an electrical interface, multiple services integration, and the electric vehicle living demonstration for open innovation.

著者

青木 浩

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.133, no.3, pp.NL3_22, 2013-03-01 (Released:2013-03-01)

著者

影山 奎斗 辻岡 凌玖 畑崎 海翔

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.143, no.3, pp.NL3_12-NL3_15, 2023-03-01 (Released:2023-03-01)

参考文献数

4

著者

天野 直樹 渡辺 優

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.128, no.10, pp.1194-1198, 2008-10-01 (Released:2008-10-01)

参考文献数

3

被引用文献数

1 1

---

The restrictions of transportation are one of the major parameters for transformer design and affect the available capacity, various characteristics and even reliability. With the progress of increasing power demand, transformer size and weight have been increasing. However, in Japan the restrictions for size and weight in rail and road are strict, and several kinds of technology for transformer construction and transportation method have been developed to meet these requirements.One technology is the disassembled transportation method for transformer. Fortunately we have experienced three type disassembled transportation methods for Kamishiiba power station for approximately 50 years. This paper introduces a history on improvement of disassembled transportation technology and development of large power transformer.

著者

鈴木 貴志 狩野 孝明 小出 英延 彦坂 知行

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.129, no.8, pp.975-979, 2009-08-01 (Released:2009-08-01)

参考文献数

5

被引用文献数

5 8

---

We have developed new vegetable based insulating oil for transformers called PFAE (Palm Fatty Acid Ester). PFAE has 0.6 times less viscosity and 1.3 times higher dielectric constant compared to mineral oil. The oxidative stability, biodegradability and acute toxicity to fish of PFAE has also been determined to be superior to mineral oil. In this paper, in order to optimize the characteristics of fatty acid esters originating from palm oil, several kinds of fatty acid alkyl esters were first synthesized in the laboratory by the molecular design technique and the transesterification from fatty acid methyl esters and alkyl alcohols. Next the electro-chemical characteristics of the fatty acid alkyl esters as insulating oil were analyzed.

著者

兒玉 学 平井 秀一郎

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.142, no.3, pp.199-204, 2022-03-01 (Released:2022-03-01)

参考文献数

12

被引用文献数

2

---

Applying a magnetic field to a water electrolyzer is one of the methods to improve energy conversion efficiency from electrical energy to hydrogen energy. In this study, experiments of alkaline water electrolysis with a magnetic field are carried out to elucidate the influence of a magnetic field direction and a magnetic flux density on cell voltage and bubble movement. In the case with B⊥electrode, the cell voltage decreases with the increase in current density and magnetic flux density, because the bubbles are removed from the electrode and the electrolyte is mixed with Lorentz-force. In the case with B∥electrode, the cell voltage is suppressed in low current density conditions. However, in high current density conditions, the bubbles are trapped in the electrolyte and the cell voltage is increased.

著者

兒玉 学 木内 豪士 鳥居 健次郎 平井 秀一郎

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.140, no.7, pp.617-622, 2020-07-01 (Released:2020-07-01)

参考文献数

16

被引用文献数

3 5

---

Three dimensional magnetohydrodynamic, two-phase flow and electrochemical reaction coupling numerical simulation of alkaline water electrolysis with magnetic field is conducted to estimate and reveal the mechanism of overvoltage suppression with the magnetic field. The numerical results shown that both vertical magnetic field to the electrode and parallel magnetic field to the electrode suppress the overpotential by the mixing of the electrolyte. This mixing is induced by the secondary flow in both cases. The overvoltage suppression is constantly increased with the increase in magnetic flux density in the case with parallel magnetic field, however, that is saturates in the case with vertical magnetic field to the electrode due to the bubble position is changed by the flow.