基于拓扑结构变化的配电网自适应保护方法

Adaptive protection method for distribution networks based on the dynamic topology

输配电网经常需要通过短时改变拓扑结构来实现故障处理,但保护装置的动作范围受拓扑变化的影响。在此背景下,首先,提出一种基于拓扑结构变化的输配电网自适应保护方法,在拓扑变化的情况下实现保护装置的最佳配置;然后,在传统自适应保护方法的基础上提出一种节点开关拓扑变化追踪技术,该技术主要根据系统结构变化,自适应改变拓扑结构,进而改变拓扑矩阵,自适应修改系统保护参数;最后对所提出的方法进行实例分析,并与传统的自适应保护方法进行比较。结果表明所提方法提高了自适应保护的整定范围和电力系统的保护能力。

The topology of distribution networks can be instantly modified to handle faults,but the operation ranges of the protection devices will be affected.In this paper,an adaptive protection method for distribution networks based on the dynamic topology is proposed to realize the optimal configuration of protection devices under different topologies.A dynamic topology tracking technology of node switch is built based on the traditional adaptive protection method.According to the system structure changes,this technology also amends the topology adaptively.During this step,the topology matrix is modified,and the system protection parameters are updated adaptively.Finally,the proposed method is compared with the traditional method in a test case.The results show that the proposed method improves the setting range of adaptive protection and the protection performance.