Abstract
AbstractThis paper proposes a new ultra‐fast contingency screening (CS) method for the transient security assessment (TSA). The method is based on the Single Machine Equivalent (SIME), but computes the critical clearing times (CCT) for given disturbances without the use of time‐domain simulations. All generators and loads are represented by a classical model and constant impedance model, respectively. The critical clustering is done using two stability indices, which are defined as the ratio of the accelerating power to the synchronizing power coefficient and the accelerating area to the decelerating area, respectively. Finally, the CCT is calculated using the equal‐area criterion to the equivalent one‐machine infinite‐bus system with the assumption that the rotor angles of the critical generators increase uniformly and the rotor angles of the non‐critical ones remain constant. The proposed CS method is tested on the 950‐bus, 230‐machine, 60‐Hz KEPCO system. Copyright © 2007 John Wiley & Sons, Ltd.
Published Version
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