.PowerGrids.Controls.DerivativeLag

y s*Td

- = -------------

u     1 + s*T1

If Td = T1 > 0, a high-pass or washout filter with cut-off frequency 1/Td is obtained.

If Td = T1 = 0 a filter with transfer function 1 is obtained. 

By default, T1 and T2 are structural parameters, so they cannot be changed at runtime without recompiling the model. In order to do so, set the noDynamics parameter explicitly to false (note that you can't set T1  and T2 to zero = 0 at runtime in this case).