著者

鶴岡 美緒 田中 学 奥野 喜裕

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.3, pp.236-241, 2018-03-01 (Released:2018-03-01)

参考文献数

28

被引用文献数

1 1

---

Power generating characteristics of seed-free linear shaped Faraday type and disk shaped Hall type MHD generators are examined by two-dimensional numerical simulation with changing the inlet ionization degree. A liner shaped Faraday type generator can get stable and high power output at high inlet ionization degree. The net enthalpy extraction ratio, however, is reduced owing to the increase in the required preionization power. At low inlet ionization degree, on the other hand, ionization instability occurs and the enthalpy extraction ratio decreases. A disk shaped Hall type generator can get high net enthalpy extraction ratio even at low inlet ionization degree under a low preionization power. The net enthalpy extraction ratio decreases for an excessive inlet ionization degree because of a strong MHD interaction.

著者

卓 新民 田中 学 奥野 喜裕

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.136, no.10, pp.779-784, 2016-10-01 (Released:2016-10-01)

参考文献数

17

被引用文献数

2 2

---

The performance and plasma stability in a high-temperature inert gas plasma MHD generator with a high enthalpy extraction ratio have been simulated numerically. To achieve a high enthalpy extraction ratio, various generator channel lengths and magnetic flux density distributions are examined so as to improve the MHD interaction strength and effective electrical conductivity. It is found that an enthalpy extraction ratio of 30% is reachable for high-temperature inert gas plasma MHD generator, and as being similar to an experimental small-scale generator, steady and homogeneous plasma can be realized at a high inlet total temperature even for a high enthalpy extraction generator with long channel length and shaped magnetic flux density distribution.

著者

田中 学 泉 裕一朗 奥野 喜裕

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.136, no.2, pp.205-210, 2016-02-01 (Released:2016-02-01)

参考文献数

22

---

MHD (magnetohydrodynamic) electrical power generation experiments have been conducted with a seed-free high temperature inert gas plasma in a disk-shaped Hall-type generator driven by a single-pulsed shock tunnel. Xenon is used as a working gas to archive a high performance at a low inlet total temperature, where the total gas temperature is varied in the range of 4600-10000K at the generator inlet. An enthalpy extraction ratio of 4.8% is obtained at the inlet total temperature of 7000K, and this value is much higher than that for argon at the same inlet total temperature. The unstable and non-uniform plasma attributed to ionization instability is observed at a high magnetic flux density and a high load resistance.

著者

田中 学 奥野 喜裕

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.8, pp.527-532, 2015-08-01 (Released:2015-08-01)

参考文献数

22

被引用文献数

5 3

---

R-θ two dimensional numerical simulations have been carried out to clarify the plasma behavior in a high-temperature inert gas plasma disk-shaped MHD generator. At low inlet total temperature and high load resistance, the plasma has spiral structure which is similar to the non-uniform structure under the weak noble gas ionization condition in a seed-plasma MHD generator. As seen in a linear-shaped faraday-type MHD generator, the plasma becomes stable with increase in the inlet total temperature because the coulomb collision of electrons becomes dominant. Even at low inlet total temperature, the ionization instability can be suppressed for low load resistance, because the relatively low electron temperature due to less Joule heating makes the ionization relaxation time longer than plasma residential time.

著者

小松 文彦 田中 学 村上 朝之 奥野 喜裕

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.7, pp.620-625, 2014 (Released:2014-07-01)

参考文献数

9

被引用文献数

5 5

---

High temperature inert gas (argon) plasma MHD electrical power generation using a linear shaped channel with Hall and diagonal connections has been conducted. It is revealed from the observation by using a high-speed camera that the MHD power-generating plasma is almost stable regardless of the connection type. Enthalpy extraction ratios of 5.6% for the Hall connection, 6.7% for the diagonal connection (diagonal angle 53∼66 degree), and 10.1% for the diagonal connection (diagonal angle 36∼48 degree) have been achieved under the operating conditions of an inlet total temperature of 9000K, an inlet total pressure of 0.105MPa, and a magnetic flux density of 4.0T. The output power can suffer from a low electric field in the upstream region in a Hall connection, and is improved for no Hall current condition in a diagonal connection.

著者

田中 学 村上 朝之 奥野 喜裕

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.7, pp.614-619, 2014 (Released:2014-07-01)

参考文献数

13

---

MHD power generation experiments have been conducted by using a single-pulsed shock-tunnel facility, where the high temperature inert gas (pure argon) at a fixed total temperature of 9000K is introduced into a linear shaped Faraday type generator without any seeding. The fluctuations in the output power and the light emission from the plasma are found to be small, and the pure inert gas plasma seems to be rather stable free from the ionization instability. The output power is improved with increasing the magnetic flux density in almost quadric way and the enthalpy extraction ratio does not depend on the inlet total pressure (11.2%-12.9% for 0.063MPa-0.105MPa). The generator performance obtained here is surely competitive or superior to that of conventional seed plasma MHD generators in the past.

著者

田中 学 村上 朝之 奥野 喜裕

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.464-469, 2014 (Released:2014-05-01)

参考文献数

16

被引用文献数

3 3

---

The plasma fluid flow behavior and power generation characteristics in a Faraday-type magnetohydrodynamics (MHD) generator using high temperature inert gas (argon) plasma has been examined by a time-dependent two-dimensional numerical simulation. The inhomogeneous and unstable plasma at an inlet total temperature of 7000K results in the reduction and fluctuation of the output power. The plasma changes to homogeneous and stable one with the increase in the inlet total temperature to 9000K. One of the reasons of the suppression of the ionization instability can be due to the weakness of the dependency of the electrical conductivity on the electron number density because the coulomb collision of electrons becomes dominant under the departure from Saha equilibrium.

著者

森本 慎一郎 朴 炳植 劉 薇 小杉 隆信

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.11, pp.1307-1316, 2004 (Released:2005-02-01)

参考文献数

24

---

For the purpose of mitigating carbon dioxide emissions, three renewable energy transportation systems are proposed in which methanol is synthesized by use of wind power generation energy at an oversea and is transported to Japan to be used for a power generation. The proposed systems are the following three systems: (1) wind energy and captured CO2 utilization system, (2) wind energy and coal utilization system, and (3) wind energy and biomass utilization system. The characteristic and cost of the proposed systems’ components such as a wind power generation and a methanol synthesis plants are investigated, and so are the energy and carbon flows of the systems, assuming that the wind power generation plant is constructed at the eastern coast of Russia. Major indicators such as energy efficiency, methanol cost, CO2 reduction cost, etc., of the proposed systems are evaluated together with those of a similar CO2 recycling system utilizing hydraulic power. On the basis of the evaluation results, the wind energy and biomass utilization system is shown to be the most excellent among the evaluated systems from the viewpoints of the CO2 reduction cost. When LNG cost is increased, its estimated CO2 reduction cost islower than that of a CO2 recovery system adopted to a conventional LNG-fired power plant. Consequently, the proposed system is expected to be a feasible option for CO2 reduction in the near future when the wind power generation cost is much decreased.

著者

大槻 貴司 尾羽 秀晃 川上 恭章 下郡 けい 水野 有智 森本 壮一 松尾 雄司

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.7, pp.334-346, 2022-07-01 (Released:2022-07-01)

参考文献数

53

被引用文献数

2

---

This study investigated cost-effective energy mix for realizing net zero CO2 emissions in Japan by 2050, employing an energy system optimization model with hourly electricity balances. The detailed temporal resolution enables the model to capture intermittency of variable renewable energy (VRE) and costs of system integration measures. Siting constraints on VRE, such as prohibiting solar PV and onshore wind developments in forest and offshore wind developments inside fishery rights area, are incorporated in the model to reflect the environmental protection and social acceptance perspectives. Simulation results imply that a well-balanced power generation mix, combining renewables, nuclear, gas-fired with carbon capture and storage, as well as ammonia-fired, would contribute to curbing mitigation costs. In contrast, a simulation case with very high VRE penetration poses economic challenges. Average shadow price of electricity in 2050 in a 100% renewables case (RE100) is projected to be more than doubled from a reference case which is based on middle-of-the-road assumptions. Marginal CO2 abatement cost in 2050 increases from 49,200 JPY/tCO2 in the reference case to 75,300 JPY/tCO2 in the RE100 case. The economic viability of high VRE penetration is improved by relaxing the siting constraints, although it may raise environmental and social concerns.

著者

岡本 遼太郎

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.136, no.3, pp.NL3_3-NL3_6, 2016-02-01 (Released:2016-03-01)

参考文献数

6

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Today, we must develop alternative energies. However, Japan does not have enough land to build large power plant. Therefore we studied about small-sized wind power generation for the purpose of developing a windmill which is suitable for the wind condition of its installed location.

著者

古川 功一郎 舟越 節彦 川内野 寿博 高崎 真司 下條 敏一 平山 開一郎 曽我部 敏明 嶋村 武夫 野原 真一

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.1, pp.53-64, 2005 (Released:2005-04-01)

参考文献数

10

被引用文献数

1 1

---

This paper describes how to smoothly restore the power system from blackout using a hydro power plant. Various kinds of abnormal phenomena could occur during the period of blackouts and restoration. Taking various possible abnormal phenomena into account, the authors first performed an analytical study of power system restoration processes using the proposed method with a simplified power system model consisting of a generator, some transmission lines and transformers. Based on this study, an actual power system test was then carried out. A transformer voltage goes to increase after its voltage application. This voltage increase causes an over voltage problem to a transformer. The authors are proposing practical countermeasures on the over voltage problem at restoration with a hydro power plant.

著者

保川 忍

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.106, no.9, pp.769-776, 1986

著者

中村 勇太 原 亮一 北 裕幸 田中 英一

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.2, pp.107-115, 2018-02-01 (Released:2018-02-01)

参考文献数

39

被引用文献数

1 1

---

From growing interests in the environment issues, promotion of photovoltaic power generation (PV) is accelerated in the world. Meanwhile, rapid chargers (RCs) for popularized electric vehicles are being installed in urban areas. These two trends in distribution system might cause severer voltage fluctuation problems. On the other hand, a RC can provide the reactive power support, which is capable of voltage regulation. Based on this viewpoint, this paper proposes a new framework of voltage regulation, in which the reactive power compensation by RCs is actively utilized. The proposed voltage regulation method combines two different control functions with consideration for over-compensation avoidance. This paper ascertains the validity of proposed voltage regulation method through numerical simulations.

著者

佐伯 尚志 岩本 伸一

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.112, no.9, pp.765-772, 1992-09-20 (Released:2008-12-19)

参考文献数

11

---

When analyzing dynamical stability in power systems, there exist various errors. First, there are analyzing errors which occur in linearlizing non-linear systems on a particular operating condition. Secondly, there are adjusting errors of the parameter values which are the time constants and the gains of the control systems. However, the conventional representative techniques, such as the eigen value method, the Routh-Hurwitz method and the Nyquist method, cannot deal with these kinds of errors. Using these representative methods, if the parameters vary, we have to recalculate the whole system stability. In order to solve this kind of problem, this paper proposes a use of the Kharitonov theorem which is one of the robust control theories.

著者

安藤 翔 五味 知幸 岩本 伸一

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.605-612, 2015-10-01 (Released:2015-10-01)

参考文献数

20

被引用文献数

1

---

Recently in Japan, large-scale introduction of photovoltaics (PVs) has been under way. This development increases the likelihood of system voltage increase and fluctuations, which can be prevented by employing PV output prediction. In this study, we focus our attention on applying PV output prediction to system operation with the objective of system voltage control. In this paper, 30 minutes ahead prediction is assumed according to prior research with prediction error consideration. System voltages of 30 minutes ahead are estimated and are controlled in advance by using transformer taps and static capacitors. In this paper, voltage control is proposed for coordinating control, which is based on one of the games in the game theory, potential game. The validity of the proposed method is confirmed by running simulations using a modified IEEE 30 bus system. By applying the proposed method, both the voltage deviations and control counts improved considerably compared to a conventional method.

著者

前川 雄一

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.10, pp.1170-1173, 2009-10-01 (Released:2009-10-01)

参考文献数

7

---

This paper describes an outline of the Honshu-Shikoku Interconnecting Transmission Line which includes the first large-scale cable line. The most significant feature of this transmission line is the installation of 500kV cables along various types of bridges. This brought many previously unknown technical hurdles such as techniques to overcome movements and vibrations of a series of large bridges. These hurdles were cleared through various efforts and techniques by the concerned parties.

著者

赤松 慶治 道平 雅一 舟木 剛 河崎 善一郎 松浦 慶士

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.121, no.4, pp.442-448, 2001-04-01 (Released:2008-12-19)

参考文献数

19

被引用文献数

2

---

In recent years, the harmonics and EMI noise sent out from an electric power conversion system are getting a great deal of attention in electromagnetic environment problems. So, the considerations for mentioned above have been getting important. Therefore, there is need to do a detail frequency analysis such as transient phenomena at the switching. So, we have proposed the analytic technique using Wavelet-transform which is possible to catch a phenomenon from the both sides of the time and the frequency. In this paper, we performed the analysis using Wavelet-transform against the actual measured date at the switching interval. Then, based on obtained result, we describe the high validity of Wavelet-transform and the application to the power electronics field.

著者

姉川 高也 石亀 篤司 高山 聡志

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.141, no.6, pp.500-501, 2021-06-01 (Released:2021-06-01)

参考文献数

3

被引用文献数

2

---

The isolated power system (off-grid) using only renewable energy resources (PCS supplies) is studied. On the other hand, the off-grid of the Japanese general transmission and distribution company using only PCS supplies has not been realized. To realize and clarify the safety operation of off-grid, in this paper, we simulated the fault aspect using the simple simulation.

著者

國分 海斗 飯岡 大輔 玉井 昌彦 小松 貴彦 青砥 由貴 織原 大 喜久里 浩之 橋本 潤 合田 忠弘 大谷 謙仁

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.141, no.5, pp.358-365, 2021-05-01 (Released:2021-05-01)

参考文献数

21

被引用文献数

1

---

In recent, smart inverter is focused on as a solution for the problems on voltage and frequency stability caused by mass introduction of PV. Smart inverter has many functions to keep voltage and frequency within the proper range. Its effectiveness significantly depends on which function is activated but it has not been clarified sufficiently. This paper investigates influence on voltage and frequency of combined use of voltage regulation function and frequency regulation function of smart inverter. In the analysis, smart inverters connected to transmission network and ones connected to distribution network are modeled separately, and appropriate function activation in each network is investigated. Results of simulation study shows that precedence setting in the combined use of multiple function sometimes makes interference among them and deteriorates performance of smart inverter. The dependencies on the performance of introduction in transmission and distribution network by the analysis, and importance of selection of activating function considering introduction amount in transmission and distribution network is recognized.

著者

根岸 信太郎

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.141, no.5, pp.NL5_6, 2021-05-01 (Released:2021-05-01)

参考文献数

4