Mathematical models of an electronic power transformer (EPT) are established for steady-state and transient stability investigations. To simplify oscillation damping analysis, a simplified dynamic model is developed by neglecting transients of a high-frequency transformer and filter inductors. Comparison between the simplified dynamic model and the detailed model is carried out by simulations using numerical computation and Matlab/Simulink to verify the accuracy of the developed model. For the purpose of the EPT controller design, a small-signal model of the EPT in a d–q synchronous rotating reference frame is established by linearisation about the operating point. According to the developed models, linearised Phillips–Heffron models of the power systems installed with the EPT are presented. Afterwards, as a case study, based upon the Phillips–Heffron models, the damping function of EPT is discussed and its performance is verified by numerical simulation.
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Wang et al. (2007) studied this question.
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