Abstract
Refined load flow calculation methods will exploit topological properties of the underlying network. An exact topological criterion, as well as a powerful handy approximation for most economic generation of the impedance matrix, are presented. Additional advantage may be taken from topology-controlled selection of reference bus and from appropriate insertion of artificial nodes. The new method has been carefully checked on a variety of power system networks of different size, the 30-, 57-, and 118-node standard test systems, authorized by IEEE Computer Application Subcommittee, among others.

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