Observability, redundancy and gross error processing in state estimation using SCADA and synchronized phasor measurements

This paper reports a study about the inclusion of voltage and current synchronized phasor measurements in the process of Power System State Estimation (PSSE). In order to do this, a least square state estimator that processes both SCADA and synchronized phasor measurements were developed. The effects of synchronized phasor measurements inclusion in the process of PSSE are analysed in terms of observability, measurement redundancy, and gross error processing. Some interesting aspects are demonstrated. To illustrate the main theoretical conclusions some test cases based on the IEEE-14 bus system are presented and analysed.