电测与仪表2017，Vol.54Issue(12)：49-53,5.
基于二阶盲辨识的系统谐波阻抗计算
Utility harmonic impedance assessment based on SOBI
摘要
Abstract
This paper points out that the error of the random independent vector method is due to that the harmonic current at the common point of coupling is approximately equivalent to the customer-side harmonic current.According to the error analysis,the method of the utility harmonic impedance assessment based on the second order blind identification (SOBI) is proposed.Firstly,the fast-changing parts and slow-changing parts are obtained by filtering from the harmonic voltages and currents measured at the PCC.According to the nature that the fast-changed part of utility harmonic current is approximately independent to the fast-changed part of customer-side harmonic current,the four independent components can be calculated by SOBI from the harmonic voltage and current at the PCC.Then,the customer harmonic current is picked out through using the correlation coefficients,which is because the harmonic current at the PCC is approximately equal to the harmonic current of customer,i.e.,the correlation coefficient between the harmonic current at the PCC and the harmonic current of customer is much larger than the correlation coefficient between the harmonic current at the PCC and the utility harmonic current.Finally,based on the nature that the random vector covariance is zero,the utility harmonic impedance is attained.Through the simulation calculation,it is easily seen that the method effectively improves the calculation precision of the random independent vector method,which has high accuracy.关键词
谐波阻抗/谐波发射/公共耦合点/二阶盲辨识/相关系数Key words
harmonic impedance/harmonic emission/PCC/SOBI/correlation coefficient分类
信息技术与安全科学引用本文复制引用
赵俊屹,杨超颖,薛志伟,赵熙..基于二阶盲辨识的系统谐波阻抗计算[J].电测与仪表,2017,54(12):49-53,5.基金项目
国家自然科学基金项目(51477105) （51477105）
