In modern large-scale interconnected power system, FACTS devices play an important role. A newly developed method, dynamic phasors method in modeling power electronic devices is discussed in this paper. This approach is based on time-varying Fourier coefficient series of the system variables. By truncating unimportant higher order series and keep only those significant series, the dynamic phasors model can catch the dynamic behavior of the original detail model. This method is able to combine continuous and discrete events of the system effectively and filter out required components (dc or ac of certain frequency) from power electronic device transient mode. Dynamic phasors method presents a new point of view for FACTS devices modeling. In particular, two typical examples and their simulation results are presented to show the effectiveness of this method.

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