カテゴリ: 研究会(論文単位)論文No: HV22015グループ名: 【B】電力・エネルギー部門 高電圧研究会発行日: 2022/01/17タイトル(英語): Numerical instability in EMT simulations of VFTs著者名: De Silva Jeewantha(Manitoba Hydro International),Gole Ani(University od Manitoba),Yamamoto Kazuo(Chubu University)著者名(英語): Jeewantha De Silva(Manitoba Hydro International),Ani Gole(University od Manitoba),Kazuo Yamamoto(Chubu University)キーワード: Ｍｏｄｅ ｔｒａｎｓｉｔｉｏｎ|ｈｉｇｈ－ｆｒｅｑｕｅｎｃｙ ｔｒａｎｓｉｅｎｔ|ｏｖｅｒｈｅａｄ ｇａｓ－ｉｎｓｕｌａｔｅｄ ｂｕｓ|Ｓｏｍｍｅｒｆｅｌｄ－Ｇｏｕｂａｕ ｐｒｏｐａｇａｔｉｏｎ|ｌｏｗ－ｆｒｅｑｕｅｎｃｙ ＴＥＭ ｐｒｏｐａｇａｔｉｏｎ|Mode transition|high-frequency transient|overhead gas-insulated bus|Sommerfeld-Goubau propagation|low-frequency TEM propagation要約(日本語): This paper has investigated the effect of mode transition from low-frequency TEM (earth-return wave) to high-frequency Sommerfeld-Goubau (surface wave) propagation on switching surges in overhead cables by adopting the complete formulas of the earth-retur要約(英語): This paper has investigated the effect of mode transition from low-frequency TEM (earth-return wave) to high-frequency Sommerfeld-Goubau (surface wave) propagation on switching surges in overhead cables by adopting the complete formulas of the earth-return impedance and admittance. The lower attenuation of the surface wave shows a significant difference in the propagation functions evaluated by a classic transmission line (TL) approach with Carson / Pollaczeck’s impedance and the space admittance. The lower attenuation in a high frequency region leads to a spike-like voltage at the wave-front of a step response in time domain, and results in switching surges with frequency components higher than 10 MHz and the peak-to-peak voltage of some hundreds V. This phenomenon cannot be reproduced by the classic TL approach, and has confirmed the reason why field measured voltages show the frequency components ranging from some MHz to 80 MHz with the peak-to-peak voltages of some hundreds V experienced in gas-insulated substations. The phenomenon is also confirmed by EMTP simulations with the complete formulas of the earth-return impedance and admittance.本誌: 2022年1月20日-2022年1月21日高電圧研究会本誌掲載ページ: 83-87 p原稿種別: 英語PDFファイルサイズ: 1,145 Kバイト
