基于DIgSILENT的分布式光伏系统对配电网线路保护的影响

Research on the Influence of Distributed Photovoltaic System on Distribution Network Protection Using DIgSILENT

随着分布式电源的不断渗入,传统的单电源辐射型网络变成双端甚至多端网络,系统的潮流方向及短路电流分布也会发生变化,这将对配电网中采取速断和过电流保护原理的保护装置的灵敏度、可靠性以及上下级线路的保护配合带来一定的影响。为此,首先搭建了基于DIgSILENT的分布式光伏系统和具体的配电网的仿真模型,然后在此基础上,定量分析了光伏系统接入位置及容量的不同对配电网短路电流和线路保护产生的影响,并提出不同的解决建议和策略。

With the continuous inflow of distributed generation,the traditional single-power radiation network becomes a two-terminal or even multi-terminal network which will change power flow and short-circuit current distribution to affect reliability and sensitivity of the relay protection device based on quick-break and over-current principle and the coordinate of upper and lower line protection device.Firstly,Distributed PV systems and the concrete distribution network simulation model were established using DIgSILENT in this paper,then the influence of different location access to power gird and different PV systems capacity on short circuit current and line protection of distribution network were quantitatively analyzed.In the end,different solutions and strategies were proposed to solve the problem.