基于旋转因子变换的频点能量插值谐波检测算法  

A frequency point energy interpolation harmonic detection algorithm based on twiddle factor transform

作　　者：王泽[1] 杨洪耕[1] 

机构地区：[1]四川大学电气信息学院,四川成都610065

出　　处：《电力系统保护与控制》2015年第6期67-71,共5页Power System Protection and Control

摘　　要：IEC标准采用10周波组或子组算法来测量谐波和间谐波,其缺陷是无法精确测量各分量的频率、幅值和相位参数,且在非同步采样时有较大误差。通过对IEC标准下非同步采样的信号进行频域旋转因子变换,根据变换后的频点能量分布,从能量角度提出了基于旋转因子变换的频点能量插值算法,消除了非关注分量对计算分量的旁瓣干涉,实现了谐波、间谐波准确辨识和精确测量。仿真结果验证所提算法的有效性,并具有优良的抗噪性能,能满足IEC标准和工程测量要求。IEC standard adopts 10 cycles＇ group or sub-group algorithms to measure harmonics and inter-harmonics, but it cannot accurately measure the frequency, amplitude and phase parameters of each component, and exists large errors with non-synchronous sampling. Through transforming the twiddle factor of signal in frequency domain with IEC standard and non-synchronous sampling, according to frequency point energy distribution, this paper proposes the method of frequency point energy interpolation based on twiddle factor transform, which eliminates the side lobe interference of calculation component came from non-attention components and achieves harmonic and inter-harmonics accurate identification and precise measurement. Simulation results verify that the proposed algorithm is effective and has eminent anti-noise performance, meeting the requirements of IEC standard and engineering measurement.

关 键 词：旋转因子变换 频点能量插值 IEC标准 非同步采样 离散傅立叶变换 

分 类 号：TM935[电气工程—电力电子与电力传动]