On identification method for load flow calculation of electric power system based on symbolic network function

This paper develops a new and efficient method, named symbolic analysis method, for the load flow calculation of power systems. It used symbol to express circuit element\´s parameters and solved the k-trees of the network, therefore, the symbolic expression of node voltage variables in node matrix equation can be evaluated; Generalized-tree method is applied in spanning tree-group of complex network, it solved the difficulty that the work of calculation and the capacity of storage are excessively increase by the increasing nodes when generating all k-tree of network. Comparing with traditional approach of load flow calculation, symbolic analysis method avoided algorithm\´s nonconvergent question and more solution phenomena, improved speed and accuracy of calculation, alleviated the "calculation catastrophe" of load flow calculation in electrical power system, and its correctness is validated by results of calculation examples.