Adaptive impact energy method for synchrophasor measurements based inter-area instability prediction and remedy

A proposed alternative model and an algorithm are presented which will improve the transient stability relay protection schemes. Presently, to replace the SEL-68 stability relay for the SCE Big Creek corridor, relay validation and method review must be performed, but no existing method is capable of handling pre-fault variations of load, power flow direction, and network topology as well as fault type, location and clearance in a multi- cycle period. An innovative method consisting of the inter-area model without parameters and the adaptive instability prediction criteria without settings, are presented. Examples show the correct method for predicting instabilities in various scenarios. Further algorithm improvement and examples show the effective method for predicting unstable circumstances and returning them to a stable state. The presented model, criteria and algorithm will be used in the synchrophasor measurements based instability predictions and remedies for the SCE Big Creek project to be used in future field testing.