基于波动和相关性复线性回归的系统谐波阻抗计算方法

系统背景谐波波动致系统谐波阻抗难以准确计算,本文基于主导波动、线性度、谐波阻抗不突变特性提出3种数据筛选准则消除背景谐波影响.本文将公共点(point of common coupling,PCC)处电流数据进行分段,由每段数据中电流的方差判断数据波动程度,依据波动程度的不同将数据分成3类.其中的第1类数据判断其电压电...

Harmonic Impedance Calculation Method of System Based on Complex Linear Regression of Fluctuation and Correlation

It is difficult to accurately calculate the harmonic impedance of the system due to background harmonic fluctuations.In this paper,three types of data filtering criteria to eliminate the influence of background harmonics are proposed based on the dominant fluctuation,linearity,and harmonic impedance non?mutation characteristics.The current data at the point of common coupling(PCC)is segmented,the data fluctuation extent is judged by the current variance in each segmentation of data and the data is,in accordance with the different fluctuation extent,is divided into three categories.The first type of the data judges the linearity of its voltage and current and the data meeting the linear threshold is considered to have the clustering feature.The harmonic impedance of the system of this type of data is calculated by the use of complex least square method.The calculation result is compared each other in chronological order,thereby judging its difference extent and taking out the difference.The proposed method and the data filtering method are compared and analyzed.It is shown by the simulation and actual case that the method in this paper is more accurate over the other methods.