【摘要】 结合小波变换良好的时频局部化特性和傅里叶变换良好的频域分析特性,提出小波变换与傅里叶变换相结合的暂态谐波分析方法。利用傅里叶变换和静态小波变换得到被测信号频域特性和时域特性,再结合连续小波变换得到暂态谐波的时频特性。理论分析和仿真试验结果表明,利用本方法得到的暂态谐波幅值与理论值一致。本方法能够准确分析电网中的暂态谐波,可为电力系统暂态谐波的分析和治理提供依据。更多还原

【Abstract】 This paper presents a novel algorithm to analyze transient harmonics.The algorithm combines the merits of wavelet transform and FFT transform.The frequency character of the sampled signal was obtained using FFT transform and the time domain character of the sampled signal was obtained using Stationary Wavelet Transform.Then the time-frequency character of transient harmonics was obtained using continuous wavelet transform.Theoretical analysis and simulation results validated that the algorithm presented in the paper could be used for precise transient harmonic analysis in power system.更多还原