本文選題：輸電線路 + 自適應重合閘��； 參考：《儀器儀表學報》2017年07期

【摘要】：針對帶并聯(lián)電抗器的電力線路瞬時性單相接地故障,為確保自適應重合閘成功并最大限度縮短非全相運行時間,提出了一種基于單頻信號全相位快速傅里葉變換(ap FFT)相位譜平坦特性的熄弧時刻捕捉算法。對故障相端電壓信號進行全相位FFT計算,分析二次電弧熄弧前后故障相端電壓信號的全相位FFT頻譜特征,在二次電弧熄弧前,由于過渡電阻的高度非線性,故障相端電壓中有劇烈變化的高頻信號,其全相位FFT相位譜不具平坦性;二次電弧熄滅后,過渡電阻消失進入恢復電壓階段,高頻信號平穩(wěn)變化,其全相位FFT相位譜較平坦。通過分析高次諧波相位譜平坦特性的變化,可準確捕捉二次電弧熄弧時刻。ATP-EMTP仿真結果表明,該方法計算簡單,受故障位置、過渡電阻、功角等因素影響小。實際故障錄波數(shù)據(jù)的分析結果驗證了所提方法的有效性。
[Abstract]:In order to ensure the success of adaptive reclosing and shorten the operation time of incomplete phase, the transient single-phase grounding fault of power line with shunt reactor is studied. An arc-extinguishing time capture algorithm based on the flat phase spectrum of single-frequency signal based on all-phase fast Fourier transform (APFFT) is proposed. The all-phase FFT calculation of the fault phase terminal voltage signal is carried out, and the all-phase FFT spectrum characteristics of the fault phase terminal voltage signal before and after the secondary arc extinguishing arc are analyzed. Before the secondary arc extinguishing, the transient resistance is highly nonlinear. The phase spectrum of all phase FFT is not flat. After the secondary arc extinguishes, the transition resistance disappears into the phase of recovery voltage, the high frequency signal changes smoothly, and the phase spectrum of FFT is flat. By analyzing the change of the flattening characteristic of the phase spectrum of high order harmonics, the simulation results of ATP-EMTP can accurately capture the arc extinguishing time of the secondary arc. The simulation results show that the method is simple to calculate and is little affected by the factors such as fault location, transition resistance, power angle and so on. The effectiveness of the proposed method is verified by the analysis of the actual fault recording data.
【作者單位】： 湖南大學電氣與信息工程學院;深圳大學光電工程學院;
【基金】：國家自然科學基金(51677060) 廣東省自然科學基金(2016A030313041)項目資助
【分類號】：TM75

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本文編號：2019699