基于偏差补偿最小二乘的谐波发射水平估计方法

摘要

为了克服电压和电流信号中的有色噪声的影响，提出了一种基于偏差补偿最小二乘的系统谐波阻抗及用户谐波发射水平的估计方法。利用公共连接点测量得到的谐波电压和谐波电流信号，通过偏差补偿最小二乘算法求解回归系数；提取对因变量解释性最强的综合变量，辨识系统中的信息和噪声，更好地克服变量相关性在系统建模中的影响。由回归系数映射出系统谐波阻抗，进而计算出用户的谐波发射水平。通过实验电路仿真分析验证了该方法的有效性。%ABSTRACT:To suppress the effects of colored noises in the voltage and current signals,a method based on bias compensa-tion recursive least squares identification is proposed to assess the harmonic impedance and the harmonic emission level. Utilizing the signals of harmonic voltage and harmonic,regre-ssion coefficients are worked out through bias compensation recursive least squares identification. The comprehensive varia-bles which can explain dependent variables most effectively are distilled,and then the useful information and noise are identi-fied. The harmonic emission level of the customer is calculated. The simulation analysis indicates that the proposed method is both valid and feasible.