基于快速离散正交S变换的电能质量扰动检测方法

提出了一种快速实现离散正交S变换的方法;并将此方法应用于检测电能质量扰动信号的起止时刻。离散正交S变换(DOST)是一种冗余度小的变换,然而利用基函数方法计算DOST的算法复杂度相对较高。为了降低算法复杂度、提高计算效率,根据DOST系数矩阵的特点,先对其进行分块处理,再利用FFT的优势,得到快速离散正交S变换(FDOST);并给出其计算复杂度的证明。将得到的FDOST系数按时频规律排列成矩阵,通过对矩阵的分析,检测扰动信号起止时刻。通过对实验数据和真实故障录波数据的分析,验证了算法的有效性和实用性。

A Method of Power Quality Disturbance DetectionBased on Fast Discret Orthogonal S-transform

A method based on fast discrete orthonormal S-tranform is proposed to detect the begin-end moment of power quality disturbance signal. Discrete Orthogonal S-transform (DOST) is a transform with small redundancy. The computational complexity of DOST using basis function method is relatively high. Fast discrete orthogonal S-transform(FDOST) is proposed to reduce the complexity of the algorithm and improve computational efficiency. Through the matrix decomposition of DOST combined with FFT, FDOST is obtained. The computational complexity of FDOST is proved. The FDOST coefficients are arranged in a matrix according to the time-frequency plane. The beginning and ending times of disturbance signal is detected by analyzing the matrix. The validity and practicability of the algorithm are verified through the analysis of the simulation data and the actual fault recording data.