Revealing a New Vulnerability of Distributed State Estimation: A Data Integrity Attack and an Unsupervised Detection Algorithm

This article proposes a distributed false data injection attack (FDIA) by attacking to the boundary buses in an interconnected power system. The proposed attack utilizes the measurements corresponding to a set of boundary buses in each neighboring areas to inject arbitrary errors to the estimated states of those buses. It is demonstrated that the attack not only gets through the robust distributed estimators but also bypasses the convergence-based detection methods. Furthermore, in an illustrative example, the differences in the attack with the conventional FDIA are briefly explained. Then, finding the optimal attack vector to minimize the maximum difference between the per area errors by considering the attacker's limitations is formulated as a mixed-integer second-order cone programming problem. Finally, an unsupervised machine learningbased detection method is proposed utilizing a kernel density estimation technique along with statistical measures. This follows an outlier detection to filter out attacks. To show the performance of the detector, the n - 1 contingency, which changes the probability distribution of data is analyzed. The proposed attack and detector are tested on various IEEE systems such as IEEE 14-bus and IEEE 118-bus test systems and the results are discussed.

Automated summary

This article proposes a distributed false data injection attack (FDIA) method that attacks the boundary buses in a power system and injects arbitrary errors using measurement data. The results show that this attack method can bypass existing distributed estimators and detection methods and optimize the attack vector to minimize the maximum difference in area errors. Additionally, an unsupervised machine learning-based detection method is proposed and validated in experiments.