OverexcitationLimiterDynamics Class

Overexcitation limiter system function block whose dynamic behaviour is described by <font color="#0f0f0f">a user-defined model.</font>

The over excitation limiter model is intended to represent the significant features of OELs necessary for some large-scale system studies. It is the result of a pragmatic approach to obtain a model that can be widely applied with attainable data from generator owners. An attempt to include all variations in the functionality of OELs and duplicate how they interact with the rest of the excitation systems would likely result in a level of application insufficient for the studies for which they are intended. Reference: IEEE OEL 421.5-2005, 9.

Different from LimIEEEOEL, LimOEL2 has a fixed pickup threshold and reduces the excitation set-point by means of a non-windup integral regulator. <i>Irated</i> is the rated machine excitation current (calculated from nameplate conditions: <i>V</i><i>_nom</i>, <i>P</i><i>_nom</i>, <i>CosPhi</i><i>_nom</i>).

Field voltage over excitation limiter.

Field voltage or current overexcitation limiter designed to protect the generator field of an AC machine with automatic excitation control from overheating due to prolonged overexcitation.