Order reduction of the dynamic model of a linear weakly periodic system-part II: frequency-dependent lines

The methodology for the order reduction of the dynamic model of a linear weakly periodic system presented in the first part of this paper is applied here to the case when the power network includes frequency dependent transmission lines. The technique for obtaining the external equivalent of the network is described. A comparison is given between systems having lines with constant or frequency-dependent parameters. Time-domain simulations have shown that the reduced-order equivalent leads to fast and accurate results.