摘要
经分析小电流接地系统单相接地时的故障特征,指出了适合暂态分量选线的高频频带,同时利用在时频空间具有良好聚焦特性的小波包,提出了一种利用多尺度小波包分解的多频带信息融合的选线方法。单一尺度的固定频带信息所形成的选线判据容错能力较低,无法保证选线的准确度和灵敏度,而利用多个频带故障信息,及其对应的小波分解系数所构造的选线判据,则可有效提高选线的鲁棒性。仿真结果表明,该方法可有效实现小电流系统的故障选线,较常规系统具有更高的可靠性和准确性。
The characteristic of a single-phase grounding fault were analyzed, and the optimal high-frequency signal was proposed, then a new adaptive fault line selection method based on multi-scale wavelet packet decomposition was proposed, which had excellent focusing property in time-frequency space. This method used the multi-scale wavelet packet decomposition, rather than fixed scale, which could significantly improve the robustness of the fault line algorithm. Simulation results showed that the combined criterion had higher accuracy and credibility than that of traditional methods.
出处
《山东大学学报（工学版）》
CAS
北大核心
2012年第2期118-123,共6页
Journal of Shandong University（Engineering Science）
基金
山东大学自主创新基金资助项目(2011GN066)
山东省博士后创新项目专项资金资助项目(201103032)
关键词
小波包
多频带
多尺度分解
小电流系统
选线
融合
wavelet packet
multi-scale decomposition
Non-solid earthed network
fault line selection
