Impact Analysis of Cyber Attack under Stable State of Power System: Voltage Stability

Smart grids offer improved environmental performance along with increased resilience; however, they are susceptible to a wide range of cyber attacks owing to the wide communication network deployed. In this paper, two cyber attack models are proposed based on bus voltage magnitude and angle which can be realized through available cyber attacks. Simulations are performed on IEEE 9 bus test system to compute steady state voltage stability limit i.e. L index to analyse the impact of proposed cyber attack models at each bus using Siemens PSS/E and MATLAB softwares. Further, a cyber attack constant (CAC) is proposed to mislead the system state data which an attacker may utilize. The results of above work reveal that the proposed cyber attack models may initiate false corrective actions by energy management center (EMC) operator. Thus, the idea of proposed work can support the EMC operator for intelligent corrective actions during cyber attacks in the smart electric grid.