Counteracting GPS Spoofing Attack on PMUs by Dynamic State Estimation

The GPS is vulnerable to GPS spoofing attack, which leads to disorder in time and position results of the GPS receiver. In power grids, phasor measurement units (PMUs) use GPS to build time-tagged measurements, so they are susceptible to this attack. As a result of this attack, sampling time and phase angle of the PMU measurements change. This paper presents a dynamic estimator to counteract the GPS spoofing attack. In this approach, the phase angle differences that result from multiple GPS spoofing attacks are estimated online, and the spoofed measurements are corrected. Since in the literature, most researches are devoted to static GPS spoofing attack detection, the proposed approach results are compared to the results of two recent static methods. Numerical results demonstrate the superiority of the proposed method in dealing with the attack compared to previous approaches.