A novel line flow based state estimation technique for power systems

A novel, line flow based state estimation (LFBSE) technique for power systems is presented in this paper. State variables are estimated through the constant, line flow based jacobian matrix constructed from the network equations. Unlike the conventional techniques where the outputs are the vectors of bus voltage magnitudes and angles, the results of the proposed method are in the terms of the quantities that indicate the line loadings and bus voltage magnitudes which can be used to identify the overloaded lines and limit violated buses instantaneously. The line flow based state estimation problem has been solved using Weighted Least Squares (WLS) technique and the results are validated against those obtained using the conventional WLS technique.