The fast super decoupled state (FSDSR) estimator in rectangular coordinates has been proposed and shown to be efficient and effective for the real-time monitoring of power systems. The new estimator involves the application of a rotational operator to the state and measurement functions resulting in an automatic decoupling of the active and reactive equations. The off-diagonal blocks of the Jacobian and gain matrices become zero and are not omitted. This paper presents an evaluation of the performance of the FSDSR estimator when using the nonquadratic criterion. The rotation angle is adjusted to give best convergence for bad data suppression. Tests are carried out on different IEEE test systems with a comparison to the fast super decoupled state (FSDSP) estimator in polar coordinates. The results indicate that the FSDSR estimator is faster than the FSDSP estimator.
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