Power system cascading failure blocking control considering system observability
DOI：10.19783/j.cnki.pspc.240504
Key Words:power system  cascading failure  observability  propagation path  blocking control
Author NameAffiliation
LIU Yumeng School of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, China) 
LIU Huan School of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, China) 
GU Xueping School of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, China) 
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Abstract:Current research on cascading failure blocking control often neglects the impact of system observability. Cascading failures can degrade the observability of a power system, thereby affecting the formulation of effective control strategies. Therefore, it is necessary to investigate the interactions between system observability and cascading failure blocking control, as well as relevant modeling methodologies. First, the concept of system observability and the process of cascading failures are introduced. Combined with the facts that cascading failures reduce system observability and blocking control strategy is affected by system observability, the correlation between system observability and cascading failure blocking control is analyzed. Then, a cascading failure blocking control model considering the observability of the system is established. Finally, comparative analyses are conducted using the IEEE 39-bus and IEEE 118-bus systems. The results show that the proposed model can effectively reduce the risk of cascading failures and improves the practicability of power system operation. A comparison of the control processes and results, with and without considering system observability, indicates that the influence of unobservability on the blocking control strategy can be partially eliminated by increasing PMU redundancy.
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