考虑误差影响的两阶段谐波源定位方法

Two-stage Location Method for Harmonic Sources Considering the Error Effect

针对基于谐波状态估计的谐波源定位方法所需量测点较多的状况,提出一种两阶段谐波源定位方法。首先,采用一种考虑量测误差的改进独立分量分析算法,进行初次谐波源筛选;然后,根据筛选结果,综合考虑量测和参数误差对谐波状态估计的影响,采用总体最小二乘算法估计可疑节点的谐波注入电流,进而实现谐波源的准确定位;最后,采用IEEE14节点系统,以失效率、均方根误差平均值及最小量测点数为评价指标,验证了本文方法的有效性。

With the consideration that the location method for harmonic sources(HSs)based on harmonic state estimation(HSE)requires more harmonic meters,a two-stage location method for HSs is proposed in this paper.Firstly,an improved independent component analysis(IICA)algorithm considering measurement error is applied to initially select HSs.Then,on the basis of selection results and with the combination of the impact of measurement error and parameter error on HSE,total least squares(TLS)algorithm is used to estimate the harmonic injection current on suspicious nodes,thereby realizing the location of HSs accurately.Finally,the validity of the proposed method is verified by simulations conducted in an IEEE14-node system with the evaluation indices of failure rate,mean value of root mean square error,and the minimum number of harmonic meters.