Abstract
With the increasingly close coupling between the cyber network and the physical power grid in Cyber Physical Power System (CPPS), the failure of cyber network has become an important cause of blackout. Equipment failure or abnormal operation state will be appeared without alarm in complex cyber network, which brings hidden failures not been diagnosed and dealt with in time. The invisibility and harmfulness of hidden failures pose a significant threat to the safe, reliable, and stable operation of CPPS. The dual hidden cascading failure model for CPPS is proposed to reveal the failure characteristics of CPPS accurately, considering not only the hidden faults in the power grid, but also the hidden failures in the cyber network. With the different coupled relationships between power systems and cyber networks, the cyber network topology with corresponding failure threshold is obtained according to the simulation of the model with different hidden failure rates of cyber network nodes. When the hidden failure rate is lower than the failure threshold, the scale-free topology cyber network coupled mode is adopted between power grids and cyber networks, otherwise the small-world topology cyber network coupled mode is adopted, which can effectively reduce the risk of power system blackouts. The method proposed in this paper is tested by using IEEE-118 power system and its cyber network. The results show that the method is effective.
Highlights
With promotion of smart grid strategy, the development of cyber network has provided great help for the economy, reliability and intelligence of power grid
The large-scale blackout events show that the increasingly complex coupled network topology increases the possibility of cascading failures, and cyber network failures become an important factor leading to the large-scale blackout [4]–[6]
Besides power system in Cyber Physical Power System (CPPS), the equipment failure of complex cyber network will appear without an alarm, diagnosing and processing, which leads to information transmission error and become the hidden failures of cyber network [23]
Summary
With promotion of smart grid strategy, the development of cyber network has provided great help for the economy, reliability and intelligence of power grid. The probability of large-scale cascading failures can be reduced by coupled similar network strategies with reasonable parameters in [14]. Besides power system in CPPS, the equipment failure of complex cyber network will appear without an alarm, diagnosing and processing, which leads to information transmission error and become the hidden failures of cyber network [23]. Taking account of the hidden failures of power grid and of cyber network comprehensive, the dual hidden cascading failure model for CPPS is proposed. From the results of the model, when the hidden failure rate is lower than the failure threshold, the scale-free topology cyber network coupled mode is adopted between power grids and cyber networks, otherwise the small-world topology cyber network coupled mode is adopted, which can effectively reduce the risk of power system blackouts
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