Recently, VTB has been developed as a naval electric ship evaluation program. However, the behind-the-source modeling level of the system generators is still not enough to realize the actual system. Especially, the results of harmonic analysis and fault analysis were not reliable because the ideal voltage source was used as a generation system due to the lack of a detailed model. For this reason, a more accurate generation model is needed to analyze the dynamic characteristics of the generation system. The work of this paper is featured by the applications of VTB for generation system modeling and simulation methods for electric ship power system design.