TY - GEN
T1 - Solving the divergence problem in AC-QSS cascading failure model by introducing the effect of a realistic UVLS Scheme
AU - Gharebaghi, Sina
AU - Vennelaganti, Sai Gopal
AU - Ray Chaudhuri, Nilanjan
AU - He, Ting
AU - Porta, Thomas La
N1 - Funding Information:
Financial support from NSF Grant Award ECCS 1836827 is gratefully acknowledged.
Publisher Copyright:
© 2020 IEEE.
PY - 2020/10/26
Y1 - 2020/10/26
N2 - AC-Quasi-Steady-State (AC-QSS) models for cascading failure often suffer from divergence issues. Presently, this is handled by uniform load shedding (ULS) or its variants till convergence is achieved. In reality, a pre-defined undervoltage load shedding (UVLS) scheme sheds loads in blocks below a voltage threshold and the system reaches a post-UVLS equilibrium, if it exists. This may not be captured by the post-ULS equilibrium, which in turn can lead to a different path of cascade propagation. We use the ULS equilibrium as the initial state and pose the problem of reaching post-UVLS equilibrium as an optimization problem. Due to the nature of the problem, an exhaustive search can be used that has exponential complexity in inputs. To solve this, we propose a heuristic that reaches a post-UVLS candidate equilibrium. The proposed algorithm is tested on a 2383-bus Polish system.
AB - AC-Quasi-Steady-State (AC-QSS) models for cascading failure often suffer from divergence issues. Presently, this is handled by uniform load shedding (ULS) or its variants till convergence is achieved. In reality, a pre-defined undervoltage load shedding (UVLS) scheme sheds loads in blocks below a voltage threshold and the system reaches a post-UVLS equilibrium, if it exists. This may not be captured by the post-ULS equilibrium, which in turn can lead to a different path of cascade propagation. We use the ULS equilibrium as the initial state and pose the problem of reaching post-UVLS equilibrium as an optimization problem. Due to the nature of the problem, an exhaustive search can be used that has exponential complexity in inputs. To solve this, we propose a heuristic that reaches a post-UVLS candidate equilibrium. The proposed algorithm is tested on a 2383-bus Polish system.
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U2 - 10.1109/ISGT-Europe47291.2020.9248846
DO - 10.1109/ISGT-Europe47291.2020.9248846
M3 - Conference contribution
AN - SCOPUS:85097334739
T3 - IEEE PES Innovative Smart Grid Technologies Conference Europe
SP - 710
EP - 714
BT - Proceedings of 2020 IEEE PES Innovative Smart Grid Technologies Europe, ISGT-Europe 2020
PB - IEEE Computer Society
T2 - 10th IEEE PES Innovative Smart Grid Technologies Europe, ISGT-Europe 2020
Y2 - 26 October 2020 through 28 October 2020
ER -