著者

本田 公韶 佐々木 博司 長田 稔 真恵原 悟 横瀬 宏

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.115, no.12, pp.1432-1437, 1995-11-20 (Released:2008-12-19)

参考文献数

4

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The demand-supply imbalance on electric power system is absorbed by system frequency variations, before the LFC controls. Since frequency fluctuations are common in all linked blocks, demand-supply imbalance of one block is absorbed by another block too. Demand-supply imbalance arises in another block simultaneously, and is absorbed by the former block. These mutual supports have a direct effect on linkage power fluctuations. The size of this self-regulation is regarded as proportional to the size of frequency fluctuation and the ratio of the former to the latter is nearly proportional to the block capacity. But, at a short period variation range, there is a fear that such a proportional relation will be biased by linkage position. We analyze this point, and reached the following conclusions. First, we can prove the existence of self-regulation bias theoretically and point out that the bias has some effect on linkage power fluctuations at short period variation range. Second, we apply this analytical method to 4 blocks-linked system of Japan, and compare the theoretical value with measured one. The result indicates no correlation among demand fluctuations of those blocks which are presupposed for calculation of the theoretical values; among several blocks is found some ununiformity of the smallest unit size of demand power variations.

著者

三浦 秀士 津守 不二夫 長田 稔子 姜 賢求

出版者

九州大学

雑誌

基盤研究(A)

巻号頁・発行日

2012-04-01

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粉末冶金によりヘテロ組織ネット構造を実現し,焼結合金鋼の超強靭化を図った.引張特性を調査し,最も引張特性に優れる最適な組成(6mass%Ni-0.4mass%C),焼結条件(1250℃×1h,真空)熱処理条件(960℃×30min溶体化後油焼入れ,200℃×1h焼戻し,Ar)を見出し,ヘテロ組織形態の最適化による超強靭な特性(最大引張強さ2040MPa,伸び8%)を得た.さらに,疲労強度は焼結鍛造鋼に匹敵する650MPaを示した.また組織観察の結果を有限要素法に反映してシミュレーションを行い,ヘテロ組織の優位性を確認した.