光伏并网对电力系统小干扰稳定的影响

Impact of Grid-connected PV on Power System Small Signal Stability

光伏并网容量的增加对电力系统运行特性的影响显著,尤其是对系统小干扰稳定性的影响值得关注。本文以三机九节点系统为例,采用特征值分析法研究了系统潮流改变、潮流不变两种情况下不同光伏并网容量对系统小干扰稳定性的影响。结果表明:系统潮流改变和潮流不变情况下光伏渗透率增加对于系统小干扰稳定性的影响存在明显差异。在光伏渗透率增加的过程中,通过动态调整同步发电机组出力以保证系统潮流不变更有利于系统的小干扰稳定。

The increasing capacity of photovoltaic(PV)generation has significant impact on operation characteristics of power system,especially for the small signal stability of the system.In this paper,impacts of integrated capacity of PV on power system small signal stability are investigated using eigenvalue analysis method under two cases of variable and constant power flow in 3-machine 9-bus system.Simulation results reveal that impacts of grid-connected PV on power system small signal stability are obviously different between the two cases of constant and variable power flow.The case of constant power flow by dynamically adjusting the output of synchronous generators is better for power system small signal stability.