配电网电压跌落对分布式光伏输出的影响

Effect of low voltage drop of distribution network on distributed PV output

针对目前因配电网电压跌落影响光伏发电系统的暂态电流输出特性的情况,为了更高效地稳定电力负荷,有必要分析当前电网轻度跌落(不超过80%)情况下,光伏发电系统的暂态电流输出特性,及时快速解决配电网电压跌落导致的系统不稳定。对低电压跌落过程中电流输出特性的仿真和10 k V与380 V接入逆变器低电压试验进行分析研究,并对比电压跌落期间引起的电压谐波和幅值,为改善电能质量提供有力的理论基础。

For the effect of voltage drop of distribution network on the transient current output characteristics of photovoltaic power generation system, in order to more efficiently stabilize power load, it is necessary to analyze the transient current output characteristics of photovoltaic power generation system under the slight drop （less than 80%） of current grid, resolving quickly system instability caused by distribution network voltage drop. The simulation of current output characteristics during low voltage drop and the low voltage trial for 10 kV and 380 V access to inverter were analyzed, and the voltage harmonics and amplitude were compared, providing strong theoretical foundation for the improvement of power quality.