基于图论的智能配电网馈线保护研究

Feeder protection based on graph theory in smart distribution system

智能配电网的出现使配电网保护技术面临新的挑战,为此提出一种适用于智能配电网的馈线保护算法。该算法结合图论知识,对配电网的有向图进行分析,把所有智能电子设备(IED)分成互联组和后备互联组,利用IED采集的故障信息实现故障的定位和隔离,原理简单,所需信息量少。研究了网络结构变化、IED拒动、断路器失灵等异常情况给馈线保护算法带来的影响,提出相应的容错算法应对这些异常情况。算例分析结果表明:算法对故障区段的判断结果准确,且能够应对网络结构变化和异常情况的发生。

Appearance of smart distribution system makes protection technology face new challenges, a feeder protection algorithm based on graph theory for smart distribution system is proposed. Using graph theory, analyzing directed graph of distribution network, dividing all IEDs into interconnected group and reserve interconnected group, the fault section can be diagnosed and isolated through fault overcurrents information from IED, the principle is simple and less information is required. Impacts of such abnormal conditions as misfunction of IED or circuit breaker and the change of network topology are discussed. To cope with abnormal conditions the fault-tolerance algorithms are given. The result of case show that the fault estimation results are exact and immune against abnormal conditions,