基于三点筛选法与偏最小二乘法的系统谐波阻抗估计  

Estimation of system harmonic impedance based on three-point screening and partial least squares

作　　者：范忠 史明明 张宸宇 郑建勇[3] Fan Zhong;Shi Mingming;Zhang Chenyu;Zheng Jianyong(State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210001,China;Electric Power Research Institute of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 211100,China;School of Electrical Engineering,Southeast University,Nanjing 210096,China)

机构地区：[1]国网江苏省电力有限公司,南京210001 [2]国网江苏省电力有限公司电力科学研究院,南京211100 [3]东南大学电气工程学院,南京210096

出　　处：《电测与仪表》2020年第17期34-38,65,共6页Electrical Measurement & Instrumentation

基　　金：江苏省电力有限公司科技项目(J2018029)。

摘　　要：针对背景谐波电压波动影响谐波阻抗估计的问题,提出一种基于三点筛选法与偏最小二乘的系统谐波阻抗估计方法。利用各个量测量与估计量之间相角关系,以三点为一组的数据建立方程,根据判别式筛选出背景谐波电压稳定时的公共耦合点测量电压电流数据,然后采用偏最小二乘法来估计出交流系统侧谐波阻抗。仿真算例表明了所提方法的正确性和有效性,可以减少背景谐波电压波动对系统谐波阻抗的影响,相比传统方法估计精度更高。Aiming at the problem that background harmonic voltage fluctuation affects harmonic impedance estimation,and a system harmonic impedance estimation method based on three-point screening method and partial least squares method is proposed in this paper.In terms of the phase angle relationship between each measurement and estimator,a set of three-point data is used to establish the equation.According to the discriminant,the measured voltage and current data of the common coupling point when the background harmonic voltage is stable are screened out.Then,the partial least square method is adopted to estimate the harmonic impedance of the AC system.The simulation results show the correctness and effectiveness of the proposed method,and it can reduce the influence of background harmonic voltage fluctuation on the harmonic impedance of the system.Compared with the traditional method,the estimation accuracy is higher.

关 键 词：系统谐波阻抗 背景谐波电压波动 三点法 数据筛选 偏最小二乘法 

分 类 号：TM464[电气工程—电器]