基于双重筛选三点法的背景谐波源等效

Equivalent background harmonic source based on double screening three point method

背景谐波源等效的关键就是系统谐波阻抗的估计。波动量法、波动量归一法和主导波动量筛选法在工程上估计系统谐波阻抗应用很广泛,但在求解过程中不能对误差进行追踪。针对上述的缺陷,文中提出了一种系统谐波阻抗估计的双重筛选三点法。利用三点为一组的数据进行线性回归分析,通过第一重筛选,选出回归误差满足精度的数据,然后通过奈尔检验法进行第二重筛选,选出用户侧为主导的数据,最后可求出背景谐波源。通过实测数据的计算证明该方法的正确性和有效性。

Background harmonic source equivalence is the key to the system harmonic impedance estimation. Fluctuation quantity method,fluctuation normalization method and dominant fluctuation screening method to estimate the harmonic impedance are widely used in engineering,but the error can not be tracked during the process of solving. In view of the above defects,this paper proposes a dual filter three point method for the estimation of the system harmonic impedance. Linear regression analysis was performed by using a set of three data points. By the first screening,we choose the regression error to meet the accuracy of data,and then,through the Nair test for the second screening,we select the user side as the leading data,finally,we can find the background harmonic. It proves that the method is correct and effective through the calculation of the measured data.