著者
関口 貴哉 和田 圭二 清水 敏久
出版者
一般社団法人 電気学会
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.142, no.7, pp.498-505, 2022-07-01 (Released:2022-07-01)
参考文献数
27

This study proposes a novel active power decoupling (APD) control method focusing on the power generation characteristics of photovoltaic (PV) arrays. Numerous studies have been conducted on the APD method for achieving a long lifetime of a residential PV power generation system. The APD method reduces the power pulsation, which contains twice the utility frequency caused by a single-phase PV inverter. Compared with the passive power decoupling method using electrolytic capacitors, the APD method incurs power conversion loss due to the increase in passive components and power devices. Many studies have considered the efficiency improvement of the APD method, however most of them focus on the power conversion loss of the APD circuit. It is necessary to consider the power conversion efficiency of the power conditioner and the power generation efficiency of the PV array collectively to improve the efficiency of the PV system. Therefore, in this study, a compensation power control for APD circuit focusing on the power generation characteristics of the PV array is proposed, and the validity of the proposed APD control was verified by evaluating the efficiency based on real-time simulation and experimental results of a 1kW power conditioner.
著者
松岡 孝一 近藤 稔 清水 康弘
出版者
一般社団法人 電気学会
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.124, no.2, pp.175-182, 2004 (Released:2004-05-01)
参考文献数
12
被引用文献数
8 11

Ventilated type traction motors are widely used for railway vehicles. However, they require overhauls to clean up inside them. Besides, they are a major noise source in railway vehicles. To solve these problems, we propose a totally-enclosed type traction motor using permanent magnet synchronous motor, that have the same weight power ratio as that of conventional ventilated type traction motor. In this paper, we report the test results of the proposed motor. The test results demonstrates that the temperature rise values are within its limit and the noise level is decreased by 10 dB compared to conventional motor.
著者
阿部 重夫
出版者
一般社団法人 電気学会
雑誌
電気学会論文誌C(電子・情報・システム部門誌) (ISSN:03854221)
巻号頁・発行日
vol.125, no.1, pp.1-6, 2005 (Released:2005-04-01)
参考文献数
9

It is wrong to consider that the more difficult the papers are, the more valuable. We should write a paper in a top-down manner, starting from the central idea that explains the originality of the paper down to the details.In the abstract, we should state the originality, the new approach, and the contribution of the paper. In the introduction, we should explain the problems of the previous work citing references and explain what is the originality of the paper and how to solve the problems in a new way. In the body of the paper, we should discuss the idea more elaborately, if possible, using figures and then move to the details. In the conclusions, we should state the method and contribution clearly.In presenting a paper, we should explain the idea by figures not resorting to mathematical equations.
著者
太刀川 喜久男
出版者
一般社団法人 電気学会
雑誌
電気学会誌 (ISSN:13405551)
巻号頁・発行日
vol.119, no.10, pp.600-603, 1999-10-01 (Released:2008-04-17)
参考文献数
4
著者
池内 丈人 茂木 進一
出版者
一般社団法人 電気学会
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.142, no.11, pp.845-851, 2022-11-01 (Released:2022-11-01)
参考文献数
28
被引用文献数
1

In this study, the authors experimentally verify the improved effects of DC supply voltage utilization by the addition of a third harmonic on pulse-voltage-injected two-phase modulation. Two-phase modulation is known for its low switching loss and high DC supply voltage utilization. However, its output voltage spectrum is spread out over a wider frequency band. Therefore, a novel two-phase modulation scheme using pulse-voltage-injection method was published previously. However, this scheme decreased the DC supply voltage utilization. To address this, the authors compare the experimental results with and without third harmonic addition and verify the effect of increasing this utilization using a three-phase voltage-fed inverter. Present results indicate that third harmonic addition improves the DC supply voltage utilization of this novel modulation scheme. Furthermore, the authors compare output voltage waveforms and spectrum, output current waveforms, and conversion efficiency to verify that the third harmonic addition does not introduce any new problems.
著者
工藤 勲
出版者
一般社団法人 電気学会
雑誌
電気学会誌 (ISSN:13405551)
巻号頁・発行日
vol.114, no.12, pp.781-784, 1994-11-20 (Released:2008-04-17)
被引用文献数
2
著者
長山 好夫
出版者
一般社団法人 電気学会
雑誌
電気学会論文誌A(基礎・材料・共通部門誌) (ISSN:03854205)
巻号頁・発行日
vol.123, no.4, pp.323-328, 2003 (Released:2003-07-01)
参考文献数
22

The tokamak with the aspect ratio less than 2 is called spherical tokamak (ST), since the plasma is naturally elongated and has a spherical shape. It is being theoretically and experimentally shown that ST has a high potential to confine the very high beta plasma (beta=plasma pressure/magnetic pressure). The blanket module can be easily replaced in ST. If the internal transport barrier and the high bootstrap current fraction are established in ST, the economical fusion reactor would be more realistic.
著者
有竹 秀一
出版者
一般社団法人 電気学会
雑誌
電氣學會雜誌 (ISSN:00202878)
巻号頁・発行日
vol.88, no.959, pp.1389-1398, 1968-08-01 (Released:2008-11-20)
参考文献数
8