中压配电网分布式智能后备保护方案

Distributed Intelligent Backup Protection Scheme of Medium Voltage Distribution Network

分布式保护是含高渗透率分布式电源接入的有源配电网保护发展的重要方向,因此提出了一种分布式智能后备保护方案。该方案采用动态阈值构成后备保护的启动判据,无需复杂的时延整定。各环网节点的后备保护利用与近邻之间的信息交互,可实现故障区段的定位和动作协同,在通信故障、智能单元故障、开关拒动等多种异常状况下实现有效的后备保护。通过有源配电网故障仿真算例验证了后备保护的有效性。

Distributed protection is an important research direction for active distribution network with high permeability distributed generation.This paper proposes a distributed intelligent backup protection scheme.And this scheme uses dynamic thresholds to form the start-up criterion of backup protection without the need for complex delay setting.The backup protections at each ring network node can effectively locate the fault section and determine the action smartly with coordination,with the help of the information exchange with its neighbors.The proposed backup protection can provide effective protection under various abnormal conditions,such as communication failure,smart unit failure,breaker miss-tripping and so on.The performance effectiveness of backup protec⁃tion is verified by the failure simulation examples of active distribution network.