Exact-decoupled rectangular-coordinates state estimation with efficient data structure management

The authors deal with the solution of power system estimate problems using node voltages in rectangular coordinates. The Jacobian matrix is diagonalized, and the mismatching vector is modified following the ideas proposed by other investigators for decoupling the Jacobian matrix when using polar coordinates. The proposed method decouples the Jacobian matrix into real and reactive-power submatrices, which are evaluated only once at the beginning of the process. An efficient data structure management technique is presented to improve the computational process. The performances of these techniques are evaluated using several power system networks. The proposed rectangular-coordinate technique is compared with the Newton-Raphson method and a polar coordinate method. The proposed data-storing method is compared with a standard technique