Robust hybrid state estimation for power systems utilizing Phasor measurements units

In this paper, we propose a robust hybrid state estimation (RHSE) algorithm to redress the presence of bounded data uncertainties (BDU) using SCADA measurements and phasor measurement units (PMUs). To address it, we modify the formulation of weighted least squares (WLS) method in a robust manner to eliminate the effect of uncertainty in both measurements and network parameters. The IEEE 30-bus system subject to uncertainty is considered as the simulation case to study the performance of the proposed RHSE approach and to compare the desirable results with the existing estimators. In the following, the impact of the number of PMUs on the performance of the proposed method is also investigated.