Apparatus and method for out-of-step protection using state plane trajectories analysis

摘要

#$%^&*AU2012206985A120140213.pdf#####ABSTRACT Various embodiments are described herein for a device and method for predicting an out-of-step condition in a power system due to a disturbance, such as a fault, where the power system comprises a power generator. The method comprises determining values for a state plane 5 trajectory for the power generator during the disturbance based on using an internal voltage angle of the power generator and a during fault rotor speed of the power generator as state variables, determining time scale values; determining values for a critical state plane trajectory for the power generator after clearing the fault, determining values for a state plane trajectory for the 10 power generator after clearing the fault, determining a critical clearing angle and a critical clearing time, and predicting that the power generator will be stable or unstable by comparing the time to clear the fault with the critical clearing time.1/23 10 24 20 wireless display unit 14 16 12 28 30 Interface Isolation and Processing Memory Operating Unit Preprocessing Unit Unit system Stage 32 Isolation and Programs postprocessing User Power 34 Stage interface Unit out-of-step prediction 26 18 22 module 36 Databases FIG. 1 Area Area 'A''B FIG. 2