计及输电线路开断时间的连锁故障快速阻断控制策略

Fast Blocking Control Strategy Against Cascading Failures Considering Tripping Time of Transmission Lines

从缩短控制时间的角度出发,基于过载主导型连锁故障的传播机理,建立一种兼顾经济性和快速性的连锁故障阻断控制方法。首先,利用线路过负荷保护模型量化线路开断时间,以开断时间最小的线路作为下一环节故障线路进行开断。基于此,考虑继电保护隐性故障构建连锁故障传播路径预测方法。然后,建立控制成本和阻断时间最小化的阻断控制模型,并定义故障环节风险重要度指标以选取阻断控制策略的最佳投入位置。最后,以IEEE 39节点系统和IEEE 118节点系统为算例进行仿真,结果表明所提模型可以在兼顾经济性的同时保证阻断控制策略实施的快速性,有效阻止故障蔓延,减少电网负荷损失。

From the perspective of reducing the control time,based on the propagation mechanism of overload-dominated cascading failures,this paper develops a blocking control method against cascading failures,which takes into account economy and rapidity.First,the line overload protection model is used to quantify the line tripping time.The line with the minimum tripping time is tripped as the next fault link.Based on this,the prediction method for propagation paths of cascading failures is established considering the hidden failure of relay protections.Then,a blocking control model to minimize control cost and blocking time is presented,and the risk importance index of faulty links is defined to select the optimal position for applying the blocking control strategy.Finally,the IEEE 39-bus system and the IEEE 118-bus system are used as cases for simulation.The results show that the proposed model can ensure the rapidity of the implementation of the blocking control strategy while taking into account the economy,effectively preventing the spread of failures and reducing load loss.