FAST SUPER DECOUPLED STATE ESTIMATOR FOR POWER-SYSTEMS

A new method is developed and presented in this paper to solve the sta te estimation problem of power systems. The method involves applicatio n of a rotational operator to the state and measurement functions resu lting in an automatic decoupling of the Jacobian and gain matrices. Th e elements of these matrices are different from those in the existing decoupled state estimators. A solution is obtained through alternately iterating the active and reactive equations using the constant gain m atrix and avoiding the approximation due to the decoupling of the Jaco bian matrix. Digital simulation studies on a variety of systems indica te that the new estimator is comparable to the best available version of the fast decoupled state estimator in terms of core size,solution t ime, mathematical structure, convergence behavior, accuracy, robustnes s, reliability and versatility. Systems with low and high R/X ratio li nes, heavy loading, ill-conditioning, and low/high reference bus volta ge are tested. Typical results are provided for illustration.