Tracking the machine states using a linear phasor estimator assisted dynamic state estimator

This paper is concerned about efficiently performing dynamic state estimation in very large scale power systems. Unlike the commonly used approach of approximating bus loads as constant impedances and using a reduced system model, this paper relies on a phasor based linear state estimator that uses the detailed system model to obtain the bus voltage estimates at a fast rate, thus eliminating the need to model loads. Moreover, the computational effort associated with dynamic state estimation is reduced by strategically dividing the system into small size zones and carrying out the dynamic state estimation independently for each one. As an illustration, dynamic state variables of a two-axis synchronous generator with IEEE-Type1 Exciter are estimated based on the proposed approach. The issue of possible synchronization errors among measurements is also addressed.