The frequency on this grid is not a new phenomenon. Fact, 1916 Steimetz took out 1 book devoted considerable attention on graphic frequency study on three-phase grid system. During the Steimetz, issues of concern mainly the graphics level 3 frequency caused by the steel core saturation in transformers and electrical machines. He was the first to suggest that connects delta to keep the graphic line frequency steps 3.After the discovery of important Steimetz, many improvements to reduce the graphic frequency problems were applicable to transformers and power in the 1930s. And throughout the history of the development of the power system frequency Accelerator problems became more common and more serious and always 1 issues that need attention and resolve to ensure the quality of the electricity grid. So, there are many books on the subject of the painter's frequency studies but as issues become increasingly complex and difficult to predict due to the control technology of human energy increasingly growing.To make the subject this thesis I did research and learn of documentary books and articles listed in part F. Reference material which is essentially "the Power System Harmonics" and articles in the "Harmonic Tutorials" to modeling and graphic frequency analysis by Matlab software.
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