基于加窗插值FFT的电力谐波检测算法研究  

FFT Algorithm Based on Window Function and Interpolation for Electric Harmonic Measurement

作　　者：于海雁[1] 陈泽旭[1,2] 

机构地区：[1]沈阳工业大学信息科学与工程学院 [2]93279部队74分队

出　　处：《沈阳大学学报》2011年第6期108-110,114,共4页

摘　　要：通过分析比较常用的谐波检测方法,根据电力谐波信号的特点,提出了布莱克曼窗与双峰插值相结合的算法,并推导出频率和幅值的修正计算公式,从而进一步降低了泄漏和噪声干扰,提高了计算频率和幅值的准确度.仿真结果验证了算法的正确性与有效性.Through the analysis and comparison of harmonic measurement methods in common use,according to the characteristics of electric harmonic signal,the combination of Blackman window function and the algorithm of double peak of spectral lines interpolation are carried out.Based on this algorithm,the modified formula of frequency and amplitude are obtained by using the polynomial approximation method,which can further reduce leakage and noise interference,and improve the calculation accuracy of the frequency and amplitude.The results of MATLAB simulation have verified the exactness and effectiveness of the algorithm.

关 键 词：电力系统 谐波检测 快速傅里叶变换(FFT) 窗函数 双峰插值 

分 类 号：TM711[电气工程—电力系统及自动化]