Multi-time interval power system state estimation incorporating phasor measurements

Although much of today´s power system remains steady, the integrations of wind power make a portion of the system become fluctuant. To monitor these fluctuations, we need to utilize phasor measurements and shorten the time interval for state estimation. On the other hand, however, this means huge increase in computation burden. As a tradeoff between accuracy and computation efficiency, a multi-time interval state estimation approach for power systems is proposed in this paper, in which fluctuant states are estimated with shorter interval and the rest steady states are estimated with longer interval. Their fusion forms the state estimates for entire power system.