为研究分布式光伏发电并入配网对谐波特性的影响，建立简化的配网模型进行理论分析，考虑了电缆电容和无功补偿装置对系统响应特性的影响，背景谐波采用工程实际应用较多的恒流源模型，基于Digsilent 搭建实际的分布式光伏发电接入的配网模型，研究了PV 接入方式、电容的系统响应特性变化对配电网谐波的影响． 仿真分析表明: 特定的网架结构会相应放大某一次或某几次谐波，使谐波畸变的严重程度超出系统承受范围;优化PV 的接入位置和分散度方式、改善滤波通道等方法可降低配网的波形畸变水平．

In order to investigate the influence of distributed photovoltaic power generation on the harmonic characteristics of power distribution networks,a simplified model for the theoretical analysis of power distribution network is established，which considers the influences of cable capacitance and reactive power compensation device on the system response characteristics.Next,an actual distribution network model based on Digsilent is constructed by using the constant-current source model commonly used in engineering practice as the harmonic source model,and the model is then used to reveal the harmonic characteristics affected by the PV access mode and the system response characteristics of capacitance.Simulated results show that specific grid structure may amplify the harmonic and cause excessive waveform distortion，and that the distortion level can be decreased by optimizing the access location and dispersion of PV and by improving the filtering channels.