著者

高木 雅昭 原 亮一 佐藤 敏之 大山 力

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.125, no.12, pp.1177-1186, 2005 (Released:2006-03-01)

参考文献数

15

---

It is very effective to enhance the robustness of control over the faults occurred in power system in order to realize stable and reliable power supply. The sliding mode control based on the Variable Structure System (VSS) theory is paid attentions as one of the promising robust control scheme. In the sliding mode control, the structure of the control system is changed across the hyper plane (switching plane) in state space so that the state variables of the system are kept on the hyper plane.This paper proposes a novel control method of generator's excitation system in which the concept of sliding mode control is employed. More specifically, the proposed method switches the reference voltage used in AVR according to the sign of switching function. This paper also discusses the systematic design procedure of the optimal hyper plane. Performance and effectiveness of the proposed control method are investigated through both numerical studies and experimental tests using the single-machine infinite-bus system simulator. Both results show that the proposed control method can damp the transient swing caused by a fault effectively.

著者

島 義和 高橋 理音 村田 年昭 田村 淳二 戸巻 雄一 富永 忍 坂原 淳史

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.125, no.9, pp.855-864, 2005 (Released:2005-12-01)

参考文献数

14

被引用文献数

3 3

---

Recently, wind power generation is increasing in the world. In the wind power stations, induction machines are mostly used as generators. Since induction generators have a stability problem similar to the transient stability of synchronous machines, it is important to analyze the transient stability of power systems including wind generators. Although there have been some reports analyzing the transient stability problem, wind turbine and wind generator are, in most cases, modeled as one mass shaft system having total inertia constant. This paper presents simulation analyses of transient stability of power system including induction generator which is expressed by a two-mass shaft model and analyzes an effect of shaft system modeling on the transient stability characteristics. Simulations are performed by PSCAD/EMTDC in this study.

著者

本田 公韶 佐々木 博司 長田 稔 真恵原 悟 横瀬 宏

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.115, no.12, pp.1432-1437, 1995-11-20 (Released:2008-12-19)

参考文献数

4

---

The demand-supply imbalance on electric power system is absorbed by system frequency variations, before the LFC controls. Since frequency fluctuations are common in all linked blocks, demand-supply imbalance of one block is absorbed by another block too. Demand-supply imbalance arises in another block simultaneously, and is absorbed by the former block. These mutual supports have a direct effect on linkage power fluctuations. The size of this self-regulation is regarded as proportional to the size of frequency fluctuation and the ratio of the former to the latter is nearly proportional to the block capacity. But, at a short period variation range, there is a fear that such a proportional relation will be biased by linkage position. We analyze this point, and reached the following conclusions. First, we can prove the existence of self-regulation bias theoretically and point out that the bias has some effect on linkage power fluctuations at short period variation range. Second, we apply this analytical method to 4 blocks-linked system of Japan, and compare the theoretical value with measured one. The result indicates no correlation among demand fluctuations of those blocks which are presupposed for calculation of the theoretical values; among several blocks is found some ununiformity of the smallest unit size of demand power variations.

著者

福井 千尋

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.5, pp.NL5_6, 2014 (Released:2014-05-01)

著者

雨谷 明弘 宮本 豊 長岡 直人

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 = The transactions of the Institute of Electrical Engineers of Japan. B, A publication of Power and Energy Society (ISSN:03854213)

巻号頁・発行日

vol.123, no.3, pp.395-401, 2003-03-01

参考文献数

12

被引用文献数

1 6

---

This paper has investigated a surge propagation characteristic on a crossbonded cable by applying a homogeneous model in comparison with a normal-bonded cable. It has been found that the former is basically determined by the inter-core mode of propagation and results in a surge voltage becoming a rather smooth and sinusoidal-like waveshape of which the oscillating frequency corresponds to the propagation velocity of the mode. On the contrary, the latter is dominated by the coaxial mode, i.e. the core-to-sheath mode, on each phase, and the surge voltage is square-like. The propagation velocity of the inter-core mode is roughly given as a difference between the coaxial and the earth-return mode velocities, and thus is smaller than the coaxial mode velocity. The maximum overvoltage on the crossbonded cable is greater than that on the normal-bonded cable in a tunnel-installed cable as is well-known, while the former has been found to be smaller in a directly buried underground cable.

著者

田辺 茂 小林 淳男

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.117, no.7, pp.1024-1031, 1997-06-20 (Released:2008-12-19)

参考文献数

10

---

We have been developing thyristor valves for high-voltage dc transmission systems for more than 20 years. During this period, the size, power loss and reliability are dramatically improved and one of the technical advancements which support the improvements is to increase the voltage and current rating of thyristors. However when thyristor voltage rating becomes higher than 6kV, increasing the voltage rating does not lead size and power loss reduction of the valve because of turn-off characteristic deteriorations. This paper describes the method which can optimize the thyristor characteristics in such a way that the size and power loss of valves are minimized. Two different approaches for HVDC and back-to-back systems are presented.

著者

岡野 邦彦 小川 雄一 飛田 健次

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 = The transactions of the Institute of Electrical Engineers of Japan. B, A publication of Power and Energy Society (ISSN:03854213)

巻号頁・発行日

vol.130, no.4, pp.395-398, 2010-04-01

参考文献数

7

被引用文献数

2

---

This paper describes a prospect toward electric power production by the Fusion energy. In the first part of the paper, a principle of TOKAMAK system which is the successful magnetic-confinement-systems for fusion reactors are shown, and then the ITER project based on TOKAMAK and the present status of ITER is reviewed. In the remainder of the paper, a roadmap for fusion energy and conceptual designs of Demonstration reactors are briefly described.

著者

山本 和男 高見 潤 岡部 成光

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 = The transactions of the Institute of Electrical Engineers of Japan. B, A publication of Power and Energy Society (ISSN:03854213)

巻号頁・発行日

vol.132, no.11, pp.903-913, 2012-11-01

参考文献数

16

被引用文献数

1 5

---

Photovoltaic power plants and wind turbines are eco-friendly power generators that utilize solar energy and wind energy, respectively. Many large-scale photovoltaic power plants have been constructed using government subsidies. Large-scale photovoltaic power plants are usually constructed in large open spaces that contain some tall structures. Therefore, such large-scale photovoltaic power plants are likely to attract lightning, which may result in the malfunction or breakdown of the electrical and electronic equipment. In this study, overvoltages generated when a lightning strikes a structure anchoring photovoltaic panels are measured using a 1 : 10 scale model. Additionally, the measurements have been verified using the FDTD (finite-difference time-domain) method. The mechanisms of the overvoltage generations on an actual-scale photovoltaic power plant have also been clarified.

著者

諸住 哲 西谷 健一 長谷川 淳 藤原 一

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌. B (ISSN:03854213)

巻号頁・発行日

vol.105, no.4, pp.355-362, 1985

著者

白井 五郎 沓掛 政志 竹内 茂

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.12, pp.1371-1380, 1993-12-20 (Released:2008-12-19)

参考文献数

21

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This paper describes a unified automatic generation control (AGC) scheme coordinating EDC (Economical Load Dispatching Control) and LFC (Load Frequency Control). So far, in absorption of the load fluctuations occurring on power systems, both of EDC and LFC systems have been considered separately each other. By coordinating both control systems, undesirable system behaviours are avoided. The responses of frequency deviation, turbine power fluctuation and tie-line power flow deviation are smoothed using the proposed AGC scheme.The background theory is based on servo-type optimal control theory. The structure of the proposed control method is a decentralized type. So, the implementation in multi-area power systems is easy.The effectiveness of the proposed unified AGC is illustrate_??_ by an example, and the simulation results on three-area power systems show that the method is encouraging. In this paper, some of the problems associated with the application of this method to the multi-area AGC are discussed.

著者

Yasunobu Yoshida Shigekazu Katagiri Masato Kawaguchi

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.123, no.5, pp.602-607, 2003 (Released:2004-03-31)

参考文献数

7

被引用文献数

1 1

---

This paper describes the temperature rise and the thermal stability of tank type power capacitors and a analyzing method of the stability and permissible overload factor using a computer. When capacitor is operated at high ambient temperature and under excessive high voltage, the temperature of the dielectric rises higher and in some cases the capacitor looses the thermal balance and finally breakdowns thermally.We measured the heat radiation coefficient and temperature rise of the capacitor, and clarified that the radiated heat calculated from the heat radiation coefficient and the area of the tank coincided with the generated heat calculated from the output of the capacitor and the loss factor of the dielectric. Furthermore we developed analyzing method of thermal stability and permissible overload factor of capacitors using a computer. By this analysis it becomes possible to know the permissible overload factor and the temperature of the capacitor dielectric without performing the temperature rise test which requires long time and much cost.

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

大藤 建太 山口 順之 星野 和巳 坂本 雅昭

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 = The transactions of the Institute of Electrical Engineers of Japan. B, A publication of Power and Energy Society (ISSN:03854213)

巻号頁・発行日

vol.128, no.9, pp.1091-1098, 2008-09-01

被引用文献数

2 2

---

In this paper, we studied how to forecast next-day hydropower energy expected output based on the past rainfall record in the reference area. Tank model, which has been conventionally applied for this type of forecast has been improved by employing Kalman Filter stepwise estimation, to accommodate seasonal and yearly variations of rainfall water runoff conditions. Our Kalman Filter Tank Model (KF-Tank Model) yielded a broader choice of parameters while maintaining acceptable level of average forecast errors of about +/-0.05[PU] per forecast period. Further, it is shown that the error correction mechanism of the KF Tank Model can remain robust for snow-falling and snow-melting seasons, without calling for parameter revisions of the model.

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

林 泰弘 松木 純也 鈴木 良治 武藤 英司

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. B (ISSN:03854213)

巻号頁・発行日

vol.125, no.9, pp.846-854, 2005

被引用文献数

34 17

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Sending voltage profile of distribution feeder is controlled by changing a tap of distribution transformer. In a distribution network with distributed generators, for reasons of effect of reversed flows from them and existence of a great number of sending voltage profile candidates, it is not easy to control sending voltage profile within the acceptable voltage limit. In this paper, in order to determine the optimal sending voltage profile of distribution transformer in a distribution network with distributed generators, the authors propose a new method to determine the optimal sending voltage profile so as to minimize total number of tap position's change per day under constraints of acceptable voltage limit. In the proposed method, after calculating acceptable range of three phase voltage of distribution feeder, the optimal profile of tap position within the calculated acceptable voltage range is determined among these candidates by using reduced ordered binary decision diagram (ROBDD) which is an efficient enumeration algorithm. In order to check the validity of the proposed method, numerical simulations are carried out for a distribution network model with a distributed generator.