.ObjectStab.Network.Controllers.TCULController

Information

Common definitions for TCUL control systems according to [1].
Using the parameter the characteristics of the mechanical delay time (Tm)
and the controlled delay time (Td) the TCUL can be influenced according
to the table below:

----------------------------------
|method|    Td     |    Tm       |
----------------------------------
|  1   |  constant |  constant   |
|  2   |  inverse  |  constant   |
|  3   |  inverse  |  inverse    |
|  4   |  both     |  constant   |
----------------------------------

Use the subclasses TCULContinuous for continuous approximation (more computationally)
efficient or the the subclass TCULDiscrete for the true discrete realization.

The tap changer is locked if the primary side voltage decreases below the
tap locking voltage specified in Vblock.

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[1] P.W. Sauer and M.A. Pai, "A comparison of discrete vs. continuous
dynamic models of tap-changing-under-load transformers", in Proceedings
of NSF/ECC Workshop on Bulk power System Voltage Phenomena - III :
Voltage Stability, Security and Control,  Davos, Switzerland, 1994.