滑窗APDFT算法在电力谐波检测中的应用

摘要

为解决传统电力谐波检测方法在电网频率偏移时,因非同采样造成增大检测误差的问题,文中根据全相位傅里叶变换的相位不变性及滑窗傅里叶变换优越的实时性的特点,提出了一种基于滑窗全相位傅里叶变换的谐波检测新算法,并给出了该算法的实现框图.利用MATLAB对算法的计算量和实时性进行了仿真分析,验证了滑窗全相位傅里叶变换的信号处理速度比全相位傅里叶变换快一倍,并具有相位不变性,在电网频率偏移时也有较高的谐波检测精度.%To solve the problem that the synchronous sampling risen from power system frequency offset amplified the errors of the harmonics detection in power system,according to the phase invariability of all phase discrete Fourier transformC APDFT) and excellent real-time performance of the sliding discrete Fourier transform (sDFT) ,this paper proposed a novel arithmetic of harmonic detection which based on the sliding all phase discrete Fourier transform (sAPDFT),and presented the block diagram of algorithm implementation. The calculated quantity and real-time performance of sAPDFT was verified by MATLAB simulation, and the speed of sAPDFT signal processing was two times as much as the APDFT ,and sAPDFT was able to keep the phase invariability and has high-accuracy of harmonic detection when power system frequency was offset.