基于三点筛选法与偏最小二乘法的系统谐波阻抗估计

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。

Estimation of System Harmonic Impedance Based on Three-point Screening and Partial Least Squares

Aiming at the problem that background harmonic voltage fluctuation affects harmonic impedance estimation, a system harmonic impedance estimation method based on three-point screening and partial least squares is proposed. Based on 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 used to estimate the harmonic impedance of the AC system. The simulation results show that the proposed method is correct and effective, and 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.