基于电弧小波谱能量分析的输电线路单相自适应重合闸

Single-Pole Adaptive Reclosure of Transmission Line Based on Arc Models and Wavelet Spectrum Energy Analysis

提出一种基于小波谱能量分析的输电线路单相自适应重合闸方案。该方案在建立瞬时故障的一、二次电弧模型的基础上,利用DB6离散小波对故障相母线电压信号进行多尺度分析,并计算其高频分量在特定时间窗内的谱能量。瞬时故障时,谱能量较大,且在断路器跳开后的6个周期内均超过设定的门槛值,而永久故障时却不能满足上述条件。这一特征被用作故障识别的判据。仿真结果证实了本文所提方案的正确性。

Based on wavelet energy spectrum analysis, the authors propose a single-pole adaptive reclosure scheme for transmission lines. On the basis of establishing primary and secondary arc models of transient fault and by use of DB6 discrete wavelet, the multi-resolution analysis on voltage signal of faulty bus is performed, and the spectrum energy of its high-frequency component within specified time window is calculated. When transient fault occurs, the spectrum energy of voltage is higher and exceeds the specified threshold during the six cycles after the tripout of circuit breaker, however these conditions are not satisfied while permanent fault occurs, thus these conditions can be taken as the criteria for fault identification. The correctness of the proposed method is verified by simulation results.