OEL3C

Authors: Erwan Guichard (DPS for RTE)

Reviewers: Lampros Papangelis (CRESYM)

IEEE OEL3C model

Context

This overexcitation limiter model first appeared in the IEEE Std 421.5-2016 (of Electrical & Engineers, 2016).

Model use, assumptions, validity domain and limitations

This model is associated to one of the voltage regulators (types AC, DC, ST) defined by the IEEE Std 421.5-2016 (of Electrical & Engineers, 2016).

The model provides an overexcitation limiter signal for the purpose of summation : the overexcitation limiter signal is added to the stator voltage deviation from the reference, thus being taken into account in the calculation of the excitation voltage.

Model input and output

The input signal is either the generator field current (for static excitation systems) or the exciter field current (for rotating exciters), in pu.

The output signal is UOelPu, the overexcitation limiter voltage in pu (base UNom).

Model parameters

Parameter Description Unit Value
ITfPu OEL timed field current limiter pick up level pu 3.7
K1 Exponent for OEL error calculation - 1
KOel OEL gain pu 1
KpOel OEL proportional gain pu 1
KScale OEL input signal scaling factor pu -
tF OEL field current measurement time constant s 0.02
tOel OEL integral time constant s 24
VOel1MaxPu OEL integrator maximum output pu (base UNom) 0.66
VOel1MinPu OEL integrator minimum output pu (base UNom) -1
VOel2MaxPu OEL maximum output pu (base UNom) 0
VOel2MinPu OEL minimum output pu (base UNom) -1

Model diagram

OEL3C

Open source implementations

This model has been successfully implemented in :

Software URL Language Open-Source License Last consulted date Comments
Dynawo Link Modelica MPL v2.0 09/10/2024  

References

  1. of Electrical, T. I., & Engineers, E. (2016). IEEE recommended practice for excitation system models for power system stability studies . IEEE Std 421.5-2016. https://home.engineering.iastate.edu/ jdm/ee554/IEEEstd421.5-2016RecPracExSysModsPwrSysStabStudies.pdf
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