基于混合谱线插值算法的谐波分析方法

Harmonic analysis based on blending line interpolation algorithm

快速傅里叶变换(FFT)是电力系统谐波分析的常用方法,但FFT在非同步采样和非整数周期截断的情况下存在较大误差,无法获得较精确的谐波参数。采用基于5项R ife-V incent(I)窗插值FFT的谐波分析算法,现有双峰谱线插值修正算法可以有效改善谐波数据准确度,但算法的精度很大程度上取决于信号频率校正系数的计算精度。而采用混合谱线插值修正算法,可得到精确的频率校正系数。仿真结果验证了该方法的可行性与有效性,并可提高谐波的检测精度。

Fast Fourier Transformation （FFT） is a common method of harmonic analysis in electric power system. It, however, commits a relatively big error under non -synchronized sampling and integral period truncation and fails to acquire accurate harmonic parameter. The accuracy of harmonic parameter of the existing bimodal line inter- polation algorithm can be enhanced by adopting FFT harmonic analysis based on Rife - Vincent （I）. However, the accuracy of parameter depends on that of correction index. The blending line interpolation algorithm is able to obtain more accurate correction index. Simulated experiment proves that this algorithm is feasible and effective to enhance accuracy.