Synchrophasor measurements based power system distributed dynamic state estimation

Abstract

With emerging synchronized phasor measurement technology, estimating dynamic state in real time (post fault) for the grid operation become feasible. However, PMU measurements undergo random errors and bad data unavoidably caused by the sensor errors, disturbances, etc. The traditional centralized state estimation methods for power system static state are not applicable for the electro-mechanical transient process. In this paper, a framework of power system dynamic state estimation (DSE) based on synchrophasor measurements is proposed, involving a separate DSE undertaken at each generator and substation level. Also, an approach of DSE for synchronous machines considering the governor regulation is proposed. The simulation result shows the increased accuracy of the dynamic generator state estimation considering speed governors and a better performance of the applied method for the overall system distributed state estimator.