中文摘要：

为确定系统公共耦合点处的主要谐波源,提出一种基于门限电压进行判断的配电系统谐波扰动源定位新方法。门限电压值可基于系统侧等值谐波源和等值阻抗得出,该值对应于系统侧和用户侧发出相等谐波电流的临界状态。通过直接对比系统公共耦合点处所测的谐波电压与门限电压即可判定出主要谐波源的位置。进一步采用基于随机变量协方差特性的系统参数估计法,有效规避了背景谐波波动对估算结果的影响,从而保证了门限电压法的高鲁棒性。仿真分析和实际算例结果均验证了所述方法的有效性。

英文摘要：

A new method based on the threshold voltage is proposed to determine the main harmonic disturbance sources on the point of common coupling (PCC) in distribution systems.The threshold voltage can be calculated based on the system equivalent harmonic current sources and the equivalent impedances downstream and upstream of the PCC.The threshold voltage corresponds to the critical voltage value when the system and customer side issued the same amount of harmonic currents.The main harmonic sources on the PCC can be determined by comparing the measured PCC voltage and the calculated threshold voltage.The system parameter estimation method adopted makes it possible to avoid the bad impact of background harmonic variation,guaranteeing the good robustness of the method proposed,whose validity is verified by simulation and actual field data analysis.