A robust bilinear three-phase state estimation method for power systems

This paper proposes a robust three-phase state-estimation method that is applicable to both balanced transmission networks and unbalanced distribution networks with nonlinear measurements. We extend the recently introduced bilinear formulation of state estimation problems to a robust three-phase model. The original nonlinear state estimation is solved by resorting to two auxiliary linear model and a nonlinear transformation in between. Bad measurements are further suppressed by introducing a robust state estimation model. Numerical tests on IEEE benchmark systems, including a distribution network and a transmission network, demonstrate the robustness and efficiency of the method.