基于光伏并网点实测数据的谐波评估

Harmonic evaluation based on measured data from point of common coupling

本文通过对某变电站10kV系统光伏并网点电能质量的实时监测,分析了光伏逆变器输出功率与特征谐波的变化规律,并以此建立了基于DIGSILENT的光伏接入系统谐波分析仿真模型。进而得出光伏电源不同出力条件下,全站谐波分布情况,给出了该变电站未来谐波分布规律的评估结果。仿真分析结果可用于后续的电能质量监测布点以及谐波治理工作。

The variation law of power and characteristic harmonics of the PV inverter is analyzed through the real-time data of the power quality by monitoring a 10kV photovoltaic grid-connected point in a substation.Basing on the analysis,the simulation model of the photovoltaic grid-connected system is established by DIGSILENT.Consequently,the harmonic distribution of a station was calculated under a variety of working conditions of photovoltaic power system.And the evaluation results of the future harmonic distribution of the substation are developed,which could be the references of power quality monitoring and harmonic control work.