分布式发电对配电网电流保护的影响分析

传统配电网一般都是单一电源的辐射状网络，继电保护按照辐射型网络进行设计和整定．随着分布式发电的接入，辐射式的网络将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．为提高分布式发电系统的供电可靠性和供电质量，论文通过公式推导、图形对比，分析了分布式发电机安装在配电网不同位置对电流保护及其动作行为的影响．

Analysis for distributed generation impacts on current protection in distribution networks

Traditional distribution network is generally a radial network with a single power source, and its relay protection is designed and set according to the radial network. With the connection of distributed generation （DG）, radial distribution networks become linking networks where generation nodes and load nodes are mixed. The power flowing in the networks will be deeply changed by the fundamental changes of the distribution networks. To enhance power supply reliability and power quality of distribution networks, the impacts of distributed generations at different positions on each current protection and its operation behavior are analyzed by formulae derivation and graphic correlation.