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Transient Stability Analysis of Power System with Photovoltaic Systems Installed

Journal of Energy and Power Engineering 2015年第10期9卷 896-904页

作者： Masaki Yagami seiichiro ishikawa Yoshihiro Ichinohe Kenji Misawa Junji Tamura Department of Electrical and Electronic Engineering Hokkaido University of Science Sapporo 006-8585 Japan Department of Electrical and Electronic Engineering Kitami Institute of Technology Kitami 090-8507 Japan

The impact of large-scale grid-connected PV （photovoltaics） on power system transient stability is discussed in this paper. In response to an increase of PV capacity, the capacity of conventional synchronous generator needs to be reduced relatively. This leads to the lower system inertia and the higher generator reactance, and hence, the power system transient stability may negatively be affected. In particular, the impact on the transient stability may become more serious when the considerable amounts of PV systems are disconnected simultaneously during voltage sag. In this work, the potential impact of significant PV penetration on the transient stability is assessed by a numerical simulation using PSCAD/EMTDC.

关键词： Photovoltaic LVRT (low-voltage ride-through) synchronous generator infinite bus transient stability.

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Far Infrared Ray Radiation Inhibits the Proliferation of A549, HSC3 and Sa3 Cancer Cells through Enhancing the Expression of ATF3 Gene

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Journal of Electromagnetic Analysis and Applications 2010年第6期2卷 382-394页

作者： Kikuji Yamashita Shine-Od Dalkhsuren Tatsuo ishikawa Kaori Sumida Jun Ishibashi Hiroyoshi Hosokawa Akemichi Ueno Fumio Nasu seiichiro Kitamura 不详

Far-infrared ray (FIR) is electromagnetic wave between 4 and 1000 μm. FIR causes heating, but how it affects cells is not well understood. In this study, we developed a culture incubator that can continuously irradiate cells with FIR and examined the effects of FIR on five human cancer cell lines, namely A431 (vulva), A549 (lung), HSC3 (tongue), MCF7 (breast) and Sa3 (gingiva). We found that FIR inhibits cell proliferation and induces cell hypertrophy without apoptosis in A549, HSC3 and Sa3 cells. Flow cytometry revealed that the inhibition of proliferation was due to G2/M arrest. Contrary, FIR did not inhibit cell proliferation and cause cell hypertrophy in A431 or MCF7 cells. Microarray analysis revealed that FIR suppressed the expression of cell proliferation-related and stress-responsive genes in FIR-sensitive cell lines (A549, HSC3 and Sa3). ATF3 in particular was identified as a key mediator of the FIR effect. Over-expression of ATF3 inhibited cell proliferation and knockdown of ATF3 mRNA using an antisense oligonucleotide suppressed FIR-induced growth arrest. These results indicate that a body temperature range of FIR radiation suppresses the proliferation of A549, HSC3, Sa3 cells and it appears that ATF3 play important roles in this effect.

关键词： Far-Infrared Radiation Human Cancer Cell Lines G2/M Arrest Hypertrophy ATF3

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