  Phasor measurement units (PMUs) are integrated to the transmission networks
under the smart grid umbrella. The observability of PMUs is geographically
limited due to their high cost in integration. The measurements of PMUs can be
complemented by those from widely installed supervisory control and data
acquisition (SCADA) to enhance the situational awareness. This paper proposes a
new state estimation method that simultaneously integrate both measurements,
and show an outstanding performance.
