Risk Assessment of Cascading Outages Based on an Extended AC Power Flow Model

Authors

Arpanahi M.K., Capitanescu F.

Reference

2024 International Conference on Smart Energy Systems and Technologies: Driving the Advances for Future Electrification, SEST 2024 - Proceedings, 2024

Description

The damaging socio-economic impact of cascading failures leading to blackout justifies the paramount importance of their risk assessment. Static cascading outage risk assessment methods remain the predominant approach for simulating cas-cading outages. However, they still require major refinement, particularly in the modeling of one of the main aspects of cascade outage simulation, i.e. under-voltage load shedding (UVLS), as well as its significant related limitation, i.e. the lack of a realistic solution when encountering divergence of AC power flow (AC PF). In this paper, a new static method is proposed for risk assessment of cascading outages. In addition to common features like modeling of system reaction to frequency deviation, the paper mainly focuses on the modeling of UVLS. To achieve this, the proposed method leverages an extended AC power flow-based (EPF) approach, combined with short-term load characteristics to replicate the system trajectory accurately, identifying the precise moment when UVLS becomes necessary. Moreover, the method ensures that UVLS is executed seamlessly, without encountering divergence in the AC power flow calculations. Tests conducted on the IEEE 39-bus system demonstrate that the proposed method can offer a more precise assessment of the risk associated with cascading outages.

Link

doi:10.1109/SEST61601.2024.10694113