How can i model "varying line reactance" in acoordance with the varying frequency of Distributed Generator in an Islanded Microgrid using SIMULINK?

In islanded microgrid, the frequency of the lines are not constant but vary with the frequency of the network.How can i model the line reactance in SIMULINK its value varies with the instantaneous frequency w of the virtual synchronous machine ? In program this is easy by first initializing with w1 = 1 (p.u), then subsequently w is calculated by using the expression in the attached paper for a drrop controlled DG