基于中位参数等价权回归法的谐波阻抗分析

为了更好的克服回归法估计谐波阻抗时样本中异常数据的干扰,提出了一种改进算法.通过同步测量公共连接点的谐波电压和电流,将其按照实部虚部进行分解,可以得到以系统谐波阻抗以及谐波电压为回归系数的回归方程.利用中位参数法得到系统谐波阻抗的初步估计,再根据等价权迭代计算谐波阻抗最终估计,进而得到用户谐波发射水平估计.该方法改进了普通稳健回归法以最小二乘解为迭代初值的缺点,具有更好的抗差性,对谐波阻抗的估计更加准确.通过实验分析验证了该方法的准确性.

Harmonic Impedance Analysis Based on Median Parameter Equivalent Weight Regression Method

In order to overcome the interference of abnormal data in samples when use regression method to estimate harmonic im- pedance, a new method was proposed. By simultaneous measurement of the harmonic voltage and harmonic current of PCC, decom- position in accordance with the real part and the imaginary part, regression equation which system harmonic impedance and harmonic voltage as regression coefficient could be get. Median parameter method was used to get the system harmonic impedance preliminary estimate and equivalent weight regression was used to compute the final results, consequently the harmonic emission level of custom- er could be calculated. This method is the combination of the respective merits of median parameter method and weighted regression method, which has better robust ability and is more accurate estimates of harmonic impedance. The validity of the method is verified by simulation analysis.