基于最小二乘法提高准同步采样谐波分析的准确度

通过研究准同步采样法谐波测量准确度与频率偏差的关系,分析同步偏差较大时,其基波与谐波的测量准确度不高的问题,提出基于最小二乘法提高准同步采样法谐波测量准确度的方法,该方法具有简单可行、运算速度快、准确度高的优点.计算机仿真及实际的配电综合测控仪中的应用表明该方法能有效提高测量谐波的准确度.

Using Least Square Method to Improve the Accuracy of Quasisynchronous Sampling Harmonics Analysis

The relationship between the accuracy of Quasi - Synchronous Sampling harmonics analysis and trequency deviation was studied. Through investigating the reasons of low measurement accuracy of fundamental wave and harmonic, the method based on least square means was presented. This method is very simple, feasible and has high computing speed. The results of computer simulation and the application on the electrical power measurement instrument have shown that the method improves the accuracy of the harmonic analysis.