Following the electronic power development with respect to electronic components and electronic commands, the use of the electronic converters took an advantage, in these last years, in the field of electric power transport. The DC transmission has many advantages compared to the AC transmission. In this paper, we considered the load flow computation of a 7-bar network with a line functioning in D.C. We used the Substitution Power Injection method (SPI) as incorporated in the Newton-Raphson algorithm. The MATLAB tool is used for programming the SPI method.
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