Robust Linear State Estimation Considering PMU Measurements at Critical Buses

Abstract

The failure of power grid system during peak and load conditions led to the development of robust state estimation method utilizing Phasor Measurement Unit (PMUs) measurements. In this paper, a novel index is proposed to determine critical buses in IEEE bus networks. A Binary Integer Programming method is utilized for optimal deployment of PMUs at critical buses using critical bus ranking. A Robust Linear State Estimation (RLSE) Algorithm is presented to obtain accurate states of the network. The conventional and PMU measurements at critical buses are integrated to form a matrix to estimate accurate states.  Residual errors obtained through linear state estimation with and without PMUs are compared to show the effectiveness of the allocation. IEEE 14, 30 bus networks are computed with MATLAB programming and the results are compared with standard methods to validate the proposed method.