- 著者
- Yoshifumi Mochinaga Hirofumi Fujie Masateru Mito
- 出版者
- The Institute of Electrical Engineers of Japan
- 雑誌
- IEEJ Transactions on Industry Applications (ISSN:09136339)
- 巻号頁・発行日
- vol.107, no.3, pp.336-343, 1987-03-20 (Released:2008-12-19)
- 参考文献数
- 9
- 著者
- Hirotaka Yamamoto Atsushi Iga Kaoru Ishihara Yuuichi Mita Hirohisa Suzuki
- 出版者
- The Institute of Electrical Engineers of Japan
- 雑誌
- IEEJ Transactions on Industry Applications (ISSN:09136339)
- 巻号頁・発行日
- vol.115, no.6, pp.702-711, 1995-05-20 (Released:2008-12-19)
- 参考文献数
- 33
- 被引用文献数
- 7 8
In the design, operation and evaluation of a photovoltaic power generation systems (PV systems), it is particularly important to accurately estimate the total amount of annual electric power generated by PV system. The authors applied a new I-V curve construction method developed for the calculation of output power from a photovoltaic array in order to develop a practical “simulation program for the calculation of the amount of electric power generated by PV system.” The following items were clarified by this research.
- 著者
- Hirofumi Akagi Satoshi Ogasawara Hyosung Kim
- 出版者
- The Institute of Electrical Engineers of Japan
- 雑誌
- IEEJ Transactions on Industry Applications (ISSN:09136339)
- 巻号頁・発行日
- vol.119, no.12, pp.1461-1470, 1999-12-01 (Released:2008-12-19)
- 参考文献数
- 18
- 被引用文献数
- 5
This paper discusses “the p-q theory” and “the cross-vector theory” in three-phase four-wire systems, with the focus on similarity and difference between the two theories. They are perfectly identical if no zero-sequence voltage is included in a three-phase three-wire system. However, they are different in definition of the instantaneous active power and instantaneous reactive power in each phase if a zero-sequence voltage or current is included in a three-phase four-wire system. Based on both theory and computer simulation, this paper leads to the following conclusions: An instantaneous reactive-power compensator without energy storage components can fully compensate for the neutral current even in a three-phase four-wire system including a zero-sequence voltage or current, when a proposed control strategy based on the p-q theory is applied: However, the compensator cannot compensate for the neutral current fully, when a conventional control strategy based on the cross-vector theory is applied.
- 著者
- Tetsuya Tanizaki Koji Ueda Masahiko Wakai
- 出版者
- The Institute of Electrical Engineers of Japan
- 雑誌
- IEEJ Transactions on Industry Applications (ISSN:09136339)
- 巻号頁・発行日
- vol.120, no.11, pp.1313-1320, 2000-11-01 (Released:2008-12-19)
- 参考文献数
- 14
The fire detection is very important to prevent a secondary disaster and to save the assistance for safe driving in the master plan of ITS. At present, the fire detectors, which have a high sensitivity, are used in order to detect the fire in tunnels. It has problems such that the detection area is very narrow and sensor head is fouled by exhaust fumes. Compared with the fire detectors, image sensor is suitable to detect the fire, because it can cover two-dimensional wide space. We had attempted elsewhere the fire detection, which compares two histograms with various shades of gray level, by means of image processing. However, there remained problems about the influence of passing vehicle in the actual outdoors environment. The flame has characteristic such that its state is unstable and repeats growth and decay. A new approach toward the fire detection based on fluctuation of the flame has been described in this paper. Conventional fire detectors could detect only a phenomenon of the fire. However, proposal method could detect not only the flame but also its position. We conducted simulation and field tests to verify the accuracy of this method, and confirmed the effectiveness.
- 著者
- Yoshifumi Mochinaga Yoshio Akatsuka Kohichi Arai Masaru Ono
- 出版者
- The Institute of Electrical Engineers of Japan
- 雑誌
- IEEJ Transactions on Industry Applications (ISSN:09136339)
- 巻号頁・発行日
- vol.111, no.3, pp.237-244, 1991-03-20 (Released:2008-12-19)
- 参考文献数
- 6
- 被引用文献数
- 1 3
Auto-transformer feeding system is standard equipment for power supply to high-speed trains on the AC electrified Shinkansen lines in Japan.Feeder side voltage of feeding transformer is 60kV on Shinkansen lines, and power supply to vehicle by an auto-transformer is stepped down from 60kV to 30kV. In the present autotransformer feeding system in which the feeder side of the feeding transformer is not grounded, the insulation level on the feeder side of the substation is set at class 60.For the purpose of economy on the substation power system, it is effective to adopt a three-winding transformer which makes the insulation level on the feeder side equal to 1/2 of the present value. Therefore, authors propose a new three-winding transformer connection that permits neutral direct grounding for the substation receiving extra-high voltage.This paper describes a theoretical study and results of a test on a mini-model of the proposed new type transformer connection. According to the result of examination, impedance characteristics of the transformer satisfy the terms of insulation level reduction. There are good prospects that the new type transformer can be introduced in practical use.