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Improved adjacent matrix based sparse technology and its application in power system calculation
Author(s): 
Pages: 50-56
Year: Issue:  9
Journal: Relay

Keyword:  improved adjacent matrixsparse technologynode orderingoptimizationnonzero injection elementpower system calculation;
Abstract: According to the highly sparse characteristics of theadjacent matrix used forthe networkstopology storing, its manifestationis improved, and theimproved adjacent matrix is applied to node ordering optimization, determination of retrieval information in advance and the formation of node admittance matrix.During the process of factorization, to achieve the nonzero retrievinginthe column direction, the stored information of the column directionis addedand the corresponding retrieval method is made. According to the relationships between new added branches in node ordering and the nonzero injections in factorization,in the meantime ofordering optimization, the position of the newaddedelements is recordedand the storage framework is formed. The proposed sparse technology is usedinthenet work impedance scanningand equivalence program, andtestingresultsforsix power systemsshow that,with the increase of system scale, the calculation efficiencyofnode equationswith the proposedmethod is greatly improved compared with the traditional methods and the NIMSCAN program, andit isapplicable to theanalysis and calculation for large scale power system.
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