线路单相接地故障熄弧时刻捕捉算法

发布时间：2018-06-15 00:30

本文选题：输电线路 + 自适应重合闸　；参考：《仪器仪表学报》2017年07期

【摘要】：针对带并联电抗器的电力线路瞬时性单相接地故障,为确保自适应重合闸成功并最大限度缩短非全相运行时间,提出了一种基于单频信号全相位快速傅里叶变换(ap FFT)相位谱平坦特性的熄弧时刻捕捉算法。对故障相端电压信号进行全相位FFT计算,分析二次电弧熄弧前后故障相端电压信号的全相位FFT频谱特征,在二次电弧熄弧前,由于过渡电阻的高度非线性,故障相端电压中有剧烈变化的高频信号,其全相位FFT相位谱不具平坦性;二次电弧熄灭后,过渡电阻消失进入恢复电压阶段,高频信号平稳变化,其全相位FFT相位谱较平坦。通过分析高次谐波相位谱平坦特性的变化,可准确捕捉二次电弧熄弧时刻。ATP-EMTP仿真结果表明,该方法计算简单,受故障位置、过渡电阻、功角等因素影响小。实际故障录波数据的分析结果验证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.
【作者单位】：湖南大学电气与信息工程学院;深圳大学光电工程学院;
【基金】：国家自然科学基金(51677060) 广东省自然科学基金(2016A030313041)项目资助
【分类号】：TM75

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