Modeling Cascading Failures in the North American Power Grid

TL;DR

This paper models the North American power grid to analyze how the failure of individual substations can trigger cascading failures, revealing the network's resilience and vulnerability patterns.

Contribution

It introduces a realistic topology-based model of the power grid to systematically study cascading failures and identifies universal behaviors in network vulnerability.

Findings

Loss of a single substation can cause 25% efficiency loss.

Approximately 40% of substations can trigger cascades when disrupted.

The network shows resilience to multiple node removals, with less than 1% impact.

Abstract

The North American power grid is one of the most complex technological networks, and its interconnectivity allows both for long-distance power transmission and for the propagation of disturbances. We model the power grid using its actual topology and plausible assumptions about the load and overload of transmission substations. Our results indicate that the loss of a single substation can lead to a 25% loss of transmission efficiency by triggering an overload cascade in the network. We systematically study the damage inflicted by the loss of single nodes, and find three universal behaviors, suggesting that 40% of the transmission substations lead to cascading failures when disrupted. While the loss of a single node can inflict substantial damage, subsequent removals have only incremental effects, in agreement with the topological resilience to less than 1% node loss.