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External subsystem equivalent model for steady-state and dynamic security assessment
Machowski, J. ...
A new method for external subsystem model reduction is proposed. The reduction process starts with the load node elimination, resulting in so called Ward-PV equivalent which contains all boundary and ...generator nodes. The number of the generator nodes is significantly decreased by aggregation. It is done by the Zhukov method, which replaces each selected group of the generator nodes by one equivalent generator node. The obtained equivalent is called the reduced Ward-PV equivalent. All generating units attached to the aggregated generator nodes are also aggregated into equivalent generating units. The equivalent obtained by such a method may be used for both steady-state and dynamic security analysis. The reduced ward-PV equivalent retains static and dynamic properties of the original ward-PV equivalent of the aggregated generator nodes are grouped for aggregation on the base of coherency. New method to recognize such groups is prposed. In order to speed up the calculations the sparse matrix techniques are used. Simplified algorithm of external subsystem model reduction is described and results for sample system are shown.
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