一种基于线路相关集的大电网继电保护隐藏故障算法

Analysis of hidden failures of protection in bulk power system based on RCTL

世界各国频繁发生的大停电事故表明,当某条线路因故需要退出运行时,后备保护中的隐藏故障造成保护发生不必要的动作是造成大停电事故发生的重要因素。提出了线路相关集的概念,详细介绍了基于最短路径算法的线路相关集求解过程,推导了多条支路同时开断时线路相关集及相关因子的求解方法。在此基础上对假想事故后的潮流转移进行快速计算,准确地判断出后备保护的隐藏故障并快速进行消除,有效防止连锁跳闸事故的发生。用CEPRI36节点系统进行了仿真验证,证明了所提方法的正确性和有效性。

In recent years, many catastrophic blackouts occurred in some countries show that the hidden failure in backup protection is the key factor which worsen the process of cascading failures in power grid. So it is important to ensure our power grid against cascading failure by searching hidden failures in backup protection and eliminate them in advance to avoid blackout. This paper proposes a measure to calculate the probability of hidden failure according to power flow transferring distribution after one or more transmission lines stop working. And a new concept RCTL （relative cluster of the transmission line） and the corresponding searching algorithm based on shortest path algorithm are proposed, the method to calculate relative factor of RCTL is also introduced. Taking CEPRI 36-bus system as an example, the power flow transferring is simulated and the simulation results show that the algorithm is accurate and effective.