Numerical Instabilities of Very-Fast-Transients in EMTP Simulation

カテゴリ: 研究会(論文単位)

論文No: HV18030

グループ名: 【B】電力・エネルギー部門 高電圧研究会

発行日: 2018/01/19

タイトル(英語): Numerical Instabilities of Very-Fast-Transients in EMTP Simulation

著者名: AMETANI Akihiro(Polytechnic Montreal),XUE Haoyan(Polytechnic Montreal),MAHSEREDJIAN Jean(Polytechnic Montreal),KOCAR Ilhan(Polytechnic Montreal)

著者名(英語): Akihiro AMETANI(Polytechnic Montreal),Haoyan XUE(Polytechnic Montreal),Jean MAHSEREDJIAN(Polytechnic Montreal),Ilhan KOCAR(Polytechnic Montreal)

キーワード: EMTP|VFT|earth-return impedance|earth-return admittance|numerical instability

要約(日本語): This paper investigates numerical instabilities observed in very-fast-transient simulations in a gas-insulated substation by a frequency dependent line modal of EMT-type software with Carson / Pollaczeck’s earth-return impedance and space admittance of overhead lines implemented in the EMTP. The instabilities start from spike-like voltages produced by traveling wave reflection and refraction at the boundary of the GIS elements such as the receiving end. Because of a very small difference of travel times between the coaxial and the earth-return modes propagating along the GIS, the spike voltages contain a very high frequency component which is beyond the applicable frequency range of Carson / Pollaczek’s formula. The finding explains the reason why a constant-parameter line model has been almost always adopted in VFT simulations. The numerical instabilities are avoided by using an accurate earth-return impedance and admittance.

要約(英語): This paper investigates numerical instabilities observed in very-fast-transient simulations in a gas-insulated substation by a frequency dependent line modal of EMT-type software with Carson / Pollaczeck’s earth-return impedance and space admittance of overhead lines implemented in the EMTP. The instabilities start from spike-like voltages produced by traveling wave reflection and refraction at the boundary of the GIS elements such as the receiving end. Because of a very small difference of travel times between the coaxial and the earth-return modes propagating along the GIS, the spike voltages contain a very high frequency component which is beyond the applicable frequency range of Carson / Pollaczek’s formula. The finding explains the reason why a constant-parameter line model has been almost always adopted in VFT simulations. The numerical instabilities are avoided by using an accurate earth-return impedance and admittance.

原稿種別: 英語

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