基于距离相关系数的公用事业侧谐波阻抗估计方法

Qidong Cai, Bing Hou, Qingfu Kong, Xin Liu, Chao Wang
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引用次数: 0

摘要

谐波阻抗的准确估计是进行谐波管理和合理划分谐波责任的前提。现有谐波阻抗估计方法要求背景谐波波动小,用户侧和公用事业侧谐波电流相互独立。然而,随着大量新能源并网,这些条件在现代电网中可能并不总是成立。因此,本文提出了一种基于距离相关系数滤波的谐波阻抗估计方法。该方法筛选出用户侧谐波电流和公用事业侧谐波电流的独立数据集,利用复独立分量分析(ICA)对双方谐波电流进行估计。与现有方法相比,该方法的阻抗估计精度更高,具有更广泛的适用性。通过仿真实验和实测数据分析,验证了该方法的有效性。
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Utility side Harmonic Impedance Estimation Method Based on Distance Correlation Coefficient
The accurate estimation of harmonic impedance is a prerequisite for harmonic management and a reasonable division of harmonic responsibility. Existing harmonic impedance estimation methods require that the background harmonic fluctuations are small and that the harmonic currents on the customer side and the utility side are independent of each other. However, the lots of new energy sources connected to the grid, these conditions may not always hold in modern power gird. Therefore, this paper proposes a method for estimating harmonic impedance based on a filtering method of distance correlation coefficients. The proposed method screening out independent data sets of customer-side harmonic currents and utility-side harmonic currents, both sides harmonic currents can be estimated by complex independent component analysis (ICA). Compared with the existing methods, the proposed method is more accurate in estimating impedance and is more widely applicable. The validity of the method is tested through simulation experiments and analysis of measured data.
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