基于非线性容量负载模型下电网的级联故障分析

首先基于IEEE118系统分别构建了具有电气特征的加权电网和只具有拓扑结构的无权电网。其次提出了一种非线性负载容量模型,利用该模型进行随机攻击的级联失效仿真,结果表明加权电网的容量参数的阈值较无权电网小,对级联失效的抗毁性更强。最后通过蓄意攻击发现,加权电网对权攻击的级联故障的抗毁性强于无权电网的度攻击。但是加权电网的介数攻击与无权电网类似,对级联故障的抗毁性较差；原因在于高介数节点为IEEE118系统中的变压器节点,对电网的传输十分重要,在实际电网中需要加强对其的保护。

Cascading failure analysis of power grid based on nonlinear capacity load model

Based on the IEEE118 system, a weighted power grid with electrical characteristics and a power grid with only topological structure are constructed respectively. Secondly, a non-linear load capacity model is proposed, which is used to simulate the cascading failure through random attacks. The results show that the threshold of the capacity parameter of the weighted power grid is smaller than that of the unweighted power grid, and more resistant to cascading failure. Finally, through deliberate attacks, it is found that the robustness of weighted power grid is more stronger to cascading faults against power attacks than unweighted power grids against degree attacks. But the betweenness attacks of weighted power grid are similar to those of unweighted power grids, and it is less robust to cascading failure; The reason is that the high- betweenness nodes are transformer nodes in the IEEE118 system, which is very important for the transmission of the power grid, and its protection needs to be strengthened in the actual power grid.