【摘要】 三角样条小波(TSW)是作者首先提出适合电力系统信号处理的小波函数,它是对称的半正交小波。基于它的小波包称为半正交小波包,它的算法简洁、准确,与Daubechies小波迭代算法不同。三角样条小波是对称的或反对称的小波,基于它的滤波器具有线性相位或广义线性相位,因而可避免信号相位失真,实验结果表明半正交小波包对故障信号的分解、压缩、重构比Daubechies小波包效果明显。另外对故障信号的小波包分解的不同频带的特征值正常信号的特征值进行比较可以对故障信号进行谐波检测和定位。更多还原

【Abstract】 Trigonometric spline wavelet, being adaptive to processing fault signals of electric power systems, is presented［1］, and it is a symmetrical and semiorthogonal wavelet. Trigonometric spline wavelet based wavelet packet be called semiorthogonal wavelet packet, its algorithm is concise and accurate and different from Daubechies wavelet using iterating. Trigonometric spline wavelet is symmetric and antisymmetric, its filter has characteristics of linear phase or generalized linear phase, so it can prevent distortion, Emulation shows that semiorthogonal wavelet packet is more effective than Daubechies wavelet packet to decompose and reconstruct fault signal. Comparing the characteristics of different frequency band to fault signal and normal signal, fault signal harmonics can be detected accurately.更多还原