This control is designed to emulate a standard utility voltage regulator or LTC control. It is attached to a particular winding of a transformer as the winding to monitor. It generally also adjusts the taps in that winding but could also be directed to control the taps in another winding.


The control has line drop compensator modeling by setting the R, X, CTprim, and ptratio properties. The control can also monitor the voltage at a remote bus to emulate various Smart Grid devices. This is a useful function for performing volt/var optimization.


To understand how regulator controls work, refer to W. H. Kersting’s book on Distribution System Modeling. A simple example of a regulator on a 12.47 kV system:


New RegControl.Reg1 Transformer=T1 Winding=2 Vreg=122 band=3 ptratio=60


With a line-drop compensator, the definition might look like


New RegControl.Reg1 Transformer=T1 Winding=2 Vreg=122 band=3

~ ptratio=60 CTprim=300 R=2 X=0


Controlling a bus at the end of the feeder to 118 V:


New RegControl.Reg1 Transformer=T1 Winding=2 Vreg=118 band=2 bus=MyEndBus