The extensive integration of Distributed Generation(DG)has led to changes in current distribution and flow patterns in the distributed distribution network,resulting in slower response of existing distribution protection devices and increased difficulty in detecting short circuit bypass tripping issues.Therefore,a fault detection and self-healing method for short-circuit skip tripping in distributed distribution networks is proposed.Analyze the impact of different types and capacities of DGs,different access points,and DGs on distribution network automation devices;Clarify the detection characteristics of skip tripping issues caused by short circuit faults.Based on the principles of current differential and fault current amplitude comparison,timely locate the fault area.Using short circuit quick break locking technology to quickly respond to faults,roughly locate the short circuit fault section and lock it;And pre-cise positioning and isolation control are carried out on the coarse fault section to close the circuit breakers in the non fault section,re-store power supply,and achieve self-healing of the distribution network.The experimental results show that the proposed method can prevent the distribution network from tripping due to short circuits,and the time required for fault self-healing is short.
关键词
分布式配电网/防短路越级跳闸/故障自愈技术/短路速断闭锁
Key words
distributed distribution network/anti short circuit skip tripping/fault self-healing technology/short circuit quick break locking
维普
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