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 ampli- fied the errors of the harmonics detection in power system, according to the phase invariability of all phase dis- crete Fourier transform（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 dis- crete Fourier transform （sAPDFT）,and presented the block diagram of algorithm implementation. The calcu- lated 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 in- variability and has high-accuracy of harmonic detection when power system frequency was offset.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2012年第6期46-51,共6页
Proceedings of the CSU-EPSA
基金
辽宁省教育厅创新团队基金项目(2008T079)
关键词
谐波电流
滑窗
实时
傅里叶变换
相位不变性
harmonic currents
sliding
real-time
Fourier transform
phase invariability
