并网光伏发电系统对配电网线路保护的影响

Influence of Grid Connected Photovoltaic Power System on Line Protection of Distribution Network

光伏发电系统的并网改变了配电网络的结构及配电网中短路电流分布,从而影响配电网继电保护。研究了光伏并网发电系统的暂态模型,利用PSASP(电力系统分析综合程序)对包含光伏发电系统的某市实际网络发生故障时进行了短路计算,分析了光伏系统不同接入位置、不同容量以及不同故障点位置对配电网短路电流和线路保护产生的影响,对此,需采取不同的策略,最后分析了光伏系统并网对自动重合闸的影响,并提出了相应的解决方案。

The structure of distribution network and the short circuit current distribution in distribution network and were changed by the grid connected of photovoltaic power system,thus the relay protection of distribution network was influenced.The transient model of grid-connected photovoltaic power system was studied,and the PSASP（power system analysis software package） was used to carry out the calculation of short circuit when the actual photovoltaic power system-contained network of a city was going wrong,and the generated influences of different interconnection locations,different capabilities and different fault points of the photovoltaic power system on the short circuit current and line protection of distribution network were analyzed,and different strategies were taken for this.Lastly,the influences of photovoltaic power system grid connection on the corresponding solutions were proposed.