【摘要】 阐述了小波变换、小波包变换和平稳小波变换的基本原理,说明了小波包变换能更有效地进行谐波的检测和分析。针对噪声环境下的谐波信号,提出了具有平移不变特性的平稳小波变换的去噪方法。最后,对电网暂态谐波和间谐波的检测进行了仿真。仿真结果表明,该方法有良好的去噪效果,能够准确地检测暂态谐波信号,为电网中的谐波治理提供依据。更多还原

【Abstract】 The basic principles of wavelet transform、wavelet packet transform and stationary wavelet transform were presented.The wavelet packet transform had good characteristics of uniform frequency decomposition;and the noisy signals could be de-noised by translation invariant de-nosing.In the end,the transient harmonic detection were simulated with emulator.The simulation results showed that transient harmonic signals could be de-noised and detected accurately by the proposed method in this paper,which provided support for harmonic analysis in power system.更多还原