一种适用于微电网的分散式自适应过电流保护

针对传统的定流继电保护不能及时响应微电网拓扑结构变化的问题，文中提出一种分散式自适应过电流保护方案。根据微电网的故障特性将微电网中的馈线以分布式电源为中心分为上游区域和下游区域。针对不同区域分别配置基于瞬时继电器的分散式保护法。最后，在电磁暂态仿真软件PSCAD/EMTDC平台上建立微电网模型，验证所提方法。结果表明，所提方法能正确地切除微电网在不同运行模式、拓扑结构、DG运行状态下的故障，提高了保护的可靠性。

A Distributed Adaptive Overcurrent Protection for Microgrid

Aiming at the problem that the traditional constant current relay protection can not respond to the topology changes of microgrid in time, a decentralized adaptive overcurrent protection scheme is proposed. According to the fault characteristics of microgrid, the feeders in microgrid are divided into upstream area and downstream area with the distributed generator (DG) as the center.And distributed protection laws based on instantaneous relays are configured for different regions. Finally, the microgrid model is built on PSCAD/EMTDC platform to test different types of faults. The results show that the proposed method can correctly cut off faults in different operation modes, topology and DG operation states of microgrid, and can improve the reliability of protection.