Power system state estimation using gravitational search algorithm

In the present paper, gravitational search algorithm in conjunction with weighted least square method has been proposed to solve state estimation (PSSE) problem by considering both conventional and PMU measurements. The proposed method considers the current phasors in polar coordinates and alleviates the ill-conditioned problem caused during flat start. The proposed algorithm has been tested on IEEE-14 and IEEE-30 bus test systems. The effectiveness of the proposed method has been compared with conventional weighted least squares method. The results reveal that the proposed method yield towards the optimum solution and it is far better than WLS method in terms of accuracy.