Generalized one-machine equivalents in transient stability studies

We consider an emerging class of hybrid methods which basically reduce a multimachine power system into a one-machine infinite bus (OMIB) equivalent and then apply the suitably adapted equal-area criterion. A time-domain transient stability program is used to refresh the OMIB parameters at each time step to arrive at “generalized” OMIBs. The scheme is able to provide accurate real-time transient stability assessment under any power system modeling, any stability scenario and any instability mode. On the other hand, similar generalized OMIBs may potentially be designed for real-time transient stability emergency control, by using real-time measurements. The purpose of this letter is to highlight some unique enhancements to the class of methods offered by the generalized OMIB concept