著者

新保 達也 大薮 多可志 広林 茂樹 竹中 幸三郎

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. E, センサ・マイクロマシン準部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A publication of Sensors and Micromachines Society (ISSN:13418939)

巻号頁・発行日

vol.124, no.12, pp.470-475, 2004-12-01

被引用文献数

5 11 2

---

The bioelectric potential of a foliage plant changes according to an occupant's behavior, for example entering the room in which the plant is installed, as well as watering and touching the plant. The potential shows the impulse responses due to the behaviors. In this study, the integrated values of the bioelectric potential were adopted to identify those behaviors. There are two types of values. Those were derived by integrating the bioelectric potential characteristics for a minute (<i>v</i>_<i>m1</i>) and for an hour (<i>v</i>_<i>h1</i>) respectively. The histogram of the values <i>v</i>_<i>m1</i> for the steady state perfectly took a normal distribution. The frequencies of <i>v</i>_<i>m1</i> for the behaviors were different compared with the steady state distribution. The system can identify the behaviors by examining the frequency table of <i>v</i>_<i>m1</i>. Conversely, it is thought the plant gives us some suggestions using bioelectric potential characteristics. A clue for communication between humans and plants was also obtained. The <i>v</i>_<i>h1</i> becomes higher as the average room temperature (<i>t</i>_<i>r</i>) becomes lower. There was a negative correlation between <i>v</i>_<i>m1</i> and <i>t</i>_<i>r</i>. There were two groups in the scatter diagram of the variables <i>v</i>_<i>m1</i> and <i>t</i>_<i>r</i>.

著者

田村 望 山本 隆彦 青木 広宙 越地 耕二 本間 章彦 巽 英介 妙中 義之

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)

巻号頁・発行日

vol.128, no.1, pp.150-151, 2008-01-01

参考文献数

4

被引用文献数

3 3

---

In Totally-Implantable Artificial Heart (TAH) system, Transcutaneous Optical Information Transmission System (TOITS) and Externally Coupled Transcutaneous Energy Transmission System (ECTETS) are effective for driving, controlling and monitoring the TAH. Using these systems, a patient needs to wear an optical coupler and a transcutaneous transformer separately, and then the patient's QOL (Quality of Life) will be deteriorated. Therefore, we research the energy and information transmission by wearing an unified transcutaneous transformer. In this paper, the unified transcutaneous transformer for the energy and information transmission was investigated. As a result, the unified transformer, by which the coupling between the energy and information transmission was reduced, was developed.

著者

小笠原 悟司

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. D, 産業応用部門誌 = The transactions of the Institute of Electrical Engineers of Japan. D, A publication of Industry Applications Society (ISSN:09136339)

巻号頁・発行日

vol.118, no.9, pp.975-980, 1998-09

被引用文献数

31 23 14

著者

小西 義則 佐藤 学

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.133, no.5, pp.NL5_2-NL5_2, 2013

著者

千住 智信 金城 達人 上里 勝実 藤田 秀紀

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.12, pp.1522-1530, 2003-12-01

被引用文献数

10 12

---

In recent year, power generation from renewable energy sources is comming up. Particularly, wind power generation is attractive because of it's advantages like, pollution free, no fuel cost, abundantly available in nature etc. However, the generated power is fluctuating and it mainly depends on the wind speed. These fluctuations will arise the bus voltage fluctuations and will cause power oscillations. A superconducting magnetic energy storage (SMES) unit based on a self-commutated inverter using Gate-turn-off (GTO) thyristor is capable of controlling both the active and reactive power simultaneously and quickly. <BR>In this paper, control system conguration for active and ractive output power control of the series and parallel compensator which applied SMES is presented. Furthermore, this paper also describes the effectiveness of generating power leveling of transmission line and compensation of the generator's terminal bus voltage instantaneous sag. It is show through simulations, that the controlling sequence of charging and discharging of the SMES coil effectively damps out the generator's terminal bus voltage fluctuations and transmission line power oscillations.

著者

椋橋 清 松田 好司 宮下 芳次 出村 剛 植田 朝喜与 吉野 勝美

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society (ISSN:03854205)

巻号頁・発行日

vol.124, no.4, pp.331-336, 2004-04-01

被引用文献数

2 2

---

Having higher melting temperature than polyethylene, polypropylene has been expected as insulation material for power cable. But isotactic polypropylene used generally is unsuitable as cable insulation because it shows poor flexibility, low breakdown strength due to growing spherulites, and so on. But stereoregular syndiotactic polypropylene (s-PP) newly developed with metallocene catalyst shows quite different properties from i-PP.<br>  The authors had investigated the basic properties of s-PP and the initial properties as a cable which was manufactured using s-PP insulation, in the previous paper. As the results of this, it was revealed that s-PP had superior thermal and electrical properties to cross-linked polyethylene and the s-PP insulation cable showed satisfactory initial properties. However, in order to apply to an actual cable, the properties must be maintainable over 30 years after construction.<br>  In this paper, we estimated the long term and remaining properties for s-PP insulation cable.<br>  A series of experiments on long term properties gave following results.<br>    (1) S-PP cable shows longer life over 30 years.<br>    (2) The breakdown strength of s-PP cable after long term experiment equal to 30 years is slightly lower than initial breakdown strength, but it's sufficient as remaining property.<br>  Furthermore, water-tree resistivity of s-PP was investigated and it was revealed that s-PP significantly suppressed the water tree propagation compared with XLPE.<br>  These results suggested that s-PP cable would be available as next generation cable.

著者

蓬原 弘一 向殿 政男

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.110, no.3, pp.218-226, 1990

被引用文献数

1 1

---

If sufficient time is allowed for detection, the aerial ultrasonic pulsed radar sensor can detect reflecting objects without being unduly subject to the effect of wind. When used for safety assurance like obstacle detection of automated guided vehicles, the pulsed radar sensor must have such fail-safe characteristics that it can monitor an area wilder than that it is originally designed to monitor when it malfunctions and can produce a hazard-signifying output signal when it stops. The ultrasonic pulsed radar sensor discussed here is in its normal operating state when a short-distance transmitter/receiver signal is received as inspection signal for monitoring its operation. The pulse signal reflected from the obstacle in question, operation monitoring signal, and gate signal are added and converted into a ternary signal. The ternary signal is converted into a binary signal that indicates the normal state of the sensor (logic 1) or the faulty state of the sensor or detection of the obstacle (logic 0). A fail-safe pulsed radar can be realized in this way.

著者

川畑 隆夫 小山 正人 玉井 伸三 藤井 俊行 打田 良平

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.113, no.7, pp.865-873, 1993

被引用文献数

6 12

---

A new PWM method of the three-level inverter using a digital signal processor, which is useful for large capacity instantaneous current controlled GTO inverters is presented.<br>In case of the three-level inverter, short pulses are always necessary to output medium voltage vectors. The output waveform deteriorates from the ideal PWM waveform by the influence of the minimum pulse width limit of the GTO thyristors.<br>In this PWM method, firstly, the switching sequences of voltage vectors which enable the neutral voltage balance control are selected.<br>And then, from these sequences of voltage vectors, sequences which are not affected by the minimum pulse width limit of GTO are selected.<br>Using these switching sequences, the voltage vector mean value control PWM method based on the space-vector control is proposed.

著者

辻本 富幸 中出 雅彦 八木 幸弘 石井 登

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.126, no.4, pp.421-426, 2006-04-01

被引用文献数

3

---

Water tree is one of the degradation aspects of XLPE cables used for under-ground distribution or transmission lines. We have developed the loss current method using 3rd harmonic in AC loss current for cable diagnosis. Harmonic components in loss current arise as a result of the non-linear voltage-current characteristics of water trees. We confirmed that the 3rd harmonic in AC loss current had good correlation with water tree growth and break down strength. After that, we have applied this method to the actual 66kV XLPE cable lines. Up to now, the number of the application results is more than 130 lines.<br>In case of cable lines terminated at gas-insulated switchgear (GIS), we have to remove the lightning arrestor (LA) and the potential transformer (PT) out of the test circuit. The reason is that we are afraid that each of LA and PT disturbs the degradation signal from cable lines. It takes extra time (1 or 2 days) and costs more to remove LA and PT in GIS out of a circuit. In order to achieve easy and reasonable diagnosis, we have developed a new method for cable lines terminated at GIS, by utilizing a technique, which enables to reduce signal of LA and PT from disturbed signal of cable lines. We confirmed the effect of the new method by experiments with actual cables.

著者

島陰 豊成 呉 カイ 加藤 丈佳 岡本 達希 鈴置 保雄

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society (ISSN:03854205)

巻号頁・発行日

vol.124, no.3, pp.277-285, 2004-03-01

被引用文献数

8 8

---

Degradation diagnosis is aimed at preventing unexpected failure and extending the service life of electric power apparatuses. It is, however, necessary to investigate the economic feasibility of degradation diagnosis, because the life-cycle cost of cable maintenance changes with the diagnostic parameters such as diagnosis cost, diagnosis interval and replacement criterion. In this paper, based on the actual data of water-tree degradation, we proposed a method of life-cycle-cost evaluation and evaluated the economic effect of degradation diagnosis. We also discussed the economic feasibility of practical nondestructive diagnosis of 6.6 kV XLPE cable, i. e. DC leakage current measurement and residual charge measurement, and compared the economic effects of these methods. As a result, the residual charge measurement is economically feasible and has higher effectiveness than the DC leakage current measurement.

著者

牧島 信吾 上園 恵一 永井 正夫

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. D, 産業応用部門誌 = The transactions of the Institute of Electrical Engineers of Japan. D, A publication of Industry Applications Society (ISSN:09136339)

巻号頁・発行日

vol.130, no.5, pp.663-670, 2010-05-01

被引用文献数

13 5

---

During the voltage saturation of a PWM inverter driving a motor, the torque control characteristics of the motor deteriorate because the controller can control only the phase of the output voltage. The cross-coupling current control scheme is a control scheme for motors, and it can be used to shift from the variable voltage mode to the voltage saturation mode seamlessly, and vice versa. This paper shows numerical simulation results and the torque response when the control scheme is used during voltage saturation.

著者

吉満 哲夫 中北 倫男

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. A (ISSN:03854205)

巻号頁・発行日

vol.99, no.11, pp.543-550, 1979-11-20 (Released:2008-06-30)

参考文献数

23

著者

後藤 真孝

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会誌 = The journal of the Institute of Electrical Engineers of Japan (ISSN:13405551)

巻号頁・発行日

vol.132, no.9, pp.630-633, 2012-09-01

被引用文献数

1

---

本記事に「抄録」はありません。

著者

桜間 一徳 原 聡司 中野 和司

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)

巻号頁・発行日

vol.126, no.5, pp.617-623, 2006-05-01

被引用文献数

2 1

---

This paper addresses a swing-up and stabilization problem of a cart-pendulum system using energy control and controlled Lagrangian methods. A common strategy for this problem is to switch two controllers for swing-up and stabilization according to the angle of the pendulum. In most cases, control performance greatly depends on the switching angle, and choice of a bad angle cannot even stand the pendulum upward. Thus, a lot of trial and error is necessary to find effective switching angles. To release us from the difficulty in choosing the switching angle, this paper proposes a robust control method to assist our choice based on controlled Lagrangian and energy control methods. Experimental results demonstrate that the proposed combination methods can effectively swing up and stabilize the pendulum, whereas existing methods cannot.

著者

梅野 孝治 堀 洋一

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.109, no.11, pp.825-832, 1989

被引用文献数

20 5

著者

江川 正尚

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.129, no.2, pp.253-256, 2009-02-01

被引用文献数

2 1

---

On July 23, 1987, a very hot day, the largest wide-area power outage occurred in Kanto-Area, Japan. The cause was a voltage collapse on the bulk power network of Tokyo Electric Power Company, due to the abnormal rate of demand rising following resume after lunch break. Aggressive studies on voltage collapse throughout industry and university have led to great advances in power system stability. This essay describes the detail record of the outage, the applied countermeasures, and the inside story when the multiple voltage solutions of power flow on actual power system were found out for the first time.

著者

倉石 英明 横山 明彦

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.127, no.1, pp.28-40, 2007-01-01

被引用文献数

6 2

---

In order to keep power supply reliability at a certain level, electric power utilities have a certain amount of reserved capacity. When no generator outage or no unexpected large power demand occurs, however, the reserved capacity is regarded as surplus facility. To reduce the reserved capacity, some margin is reserved in tie lines between utilities. This margin is called Capacity Benefit Margin (CBM). In this study, a method of calculating optimal CBM in tie line under deregulated environment is described and two kind of optimal CBM are proposed. As a result, it is shown how the deregulation affects the optimal CBM by using numerical simulation for IEE Japan West 30 test system.

著者

石崎 彰 田中 丈志 高崎 一彦 西方 正司 渡邉 勝之 片桐 淳夫

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.113, no.10, pp.1192-1199, 1993

被引用文献数

19 14

---

It is well known that the direct drive systems not to use the reduction gears with the clearane and backlash are required for the highly precise position control, whose motor must have high torque at very low speed. The authors have developed a new motor for this purpose and named PM vernier motor.<br>In this paper, it is explained at first what is PM vernier motor, the construction and principle, and then the theory able to calculate the torque and how to control its speed are described. It is also shown that the calculated values of torque were agreed well with the experimental results.

著者

望月 寛 浅野 晃 佐野 実 高橋 聖 中村 英夫

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. D, 産業応用部門誌 = The transactions of the Institute of Electrical Engineers of Japan. D, A publication of Industry Applications Society (ISSN:09136339)

巻号頁・発行日

vol.126, no.3, pp.337-344, 2006-03-01

被引用文献数

8 1

---

Recently, QAM (Quadrature Amplitude Modulation) transmission is paid to attention in digital modulation method, and it has been used for wireless LAN and digital broadcasting. QAM is a modulation method that puts information on carrier amplitude and phase. So QAM can achieve high-capacity data transmission that the use efficiency of frequency band is good. But QAM has a bad characteristic that is weak to the noise and the interference because distance between each symbol is short. Then we propose the method that not transmission data but CDMA signal, obtained after transmission data is modulated by spread code and multiplexed, is given to each symbol of QAM. And we studied about railway signal system on track circuit as a sample to apply this method. As result of computer simulations, we verified to be able to achieve the improvement of signal to noise ratio by optimizing the constellation map of QAM. We report with the method of a synchronous acquisition.

著者

小笠原 悟司 藤田 英明 赤木 泰文

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. D, 産業応用部門誌 = The transactions of the Institute of Electrical Engineers of Japan. D, A publication of Industry Applications Society (ISSN:09136339)

巻号頁・発行日

vol.115, no.1, pp.77-83, 1994-12-20

参考文献数

5

被引用文献数

41 40

---

This paper deals with the high-frequency leakage current caused by a voltage-source PWM inverter. A nonnegligible amount of leakage current would flow through stray capacitors between stator windings and a motor frame due to a, large step change of the common-mode voltage produced by the PWM inverter. An equivalent circuit for the leakage current is proposed, which is expressed by a series resonant circuit. The analysis applying the equivalent circuit gives us such a conclusion that the connection of a common-mode choke in series between the inverter and motor terminal is not effective to reduce the rms and average value of the leakage current, but effective to reduce the peak value. Furthermore, this paper shows that the modeling and analysis are valid in designing a previously proposed suppression method of the leakage current.