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A method is developed to reduce large power systems to single and multi-port frequency dependent equivalents. h e equivalents consist of simple RLC moduh that faithfilly reproduce the frequency characteristics of the netwok The method is implemented in the EMTP and has been extensively tested at Ontario Hydro. The implementation involws a pre-processor program to generate the model: the Frequency Depena!ent Equivalent Fz)NE), and a EM= time step b o p module to calculate the transient response. zhe use of the " E results in major reductions in computer time and is especially beneficial for multi-case statistical EMW stdies. An example showing the accuracy and e c i e n c y of the IDhE when used to reduce a large 51x) kV network is presented.

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