基于故障分量的系统侧谐波阻抗计算方法

Utility Harmonic Impedance Estimation Based on Fault Component

提出一种新的基于故障分量计算系统侧谐波阻抗的方法。基于谐波污染等效分析模型,分析了用户侧发生故障时引发公共耦合点PCC处谐波电压电流波动的特点,通过计算PCC点谐波波动伏安特性比来精确计算系统侧的谐波阻抗。仿真分析和现场数据计算结果表明,该方法可以有效避开系统侧引发的公共耦合点谐波电压波动的干扰,从而得到更为准确的系统侧谐波阻抗值。所做研究工作对评估用户谐波发射水平以及划分谐波污染责任有一定指导作用。

A new calculation method for harmonic impedance of system side based on fault component is proposed. Based on the equivalent analysis model of harmonic pollution,the characteristics of harmonic voltage and current fluctuation at point of common coupling( PCC) caused by the failure of the customer side are analyzed,and the harmonic impedance of the system side is accurately calculated by calculating the volt-ampere characteristic ratio of PCC. The simulation analysis and field data calculation results show that the proposed method can effectively avoid the interference of harmonic voltage fluctuation caused by point of common coupling on the system side,so as to obtain more accurate harmonic impedance value on the system side. The research work can be used to evaluate the level of harmonic emission and to divide the responsibility of harmonic pollution.