分布式发电对配电网继电保护的影响分析

Analysis for Distributed Generation Impacts on Relay Protection in Distribution Networks

分布式发电作为一种新兴高效、经济的发电技术,近年来获得飞速发展.然而,大量DG的接入使系统由单一电源的辐射状网络变为一种遍布电源和用户互联的网络,使得配电网中的潮流分布发生根本变化,对系统的可靠性和稳定性提出了新的要求.本文详细分析DG上下游及相邻馈线不同地点发生短路故障,短路电流的大小和分布对继电保护及动作行为的影响,为并入DG后的配电网继电保护算法研究提供了一定的理论依据。

As a new, efficient and economic power generation technology, distributed generation has been in fast development in recent years. However,with the in- creasing proportion of distributed generation （DG） in power system , radial distribution networks be- come linking networks where generation nodes and load nodes are mixed. The power flowing in the networks will be deeply changed by the fundamen- tal changes of the distribution networks. Those changes come up with new request about reliability and stability for the system. This text discusses de- tailedly the size and distribution of the short circuit current to the influence of current protection and its operation behavior when short fault occurs at different positions of various feeders, which pro- vides some theoretical basis for relay protection al- gorithm research of distribution system.