UEL1
Reviewers: Lampros Papangelis (CRESYM)
IEEE UEL1 model
Context
This underexcitation 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 underexcitation limiter signal for the purpose of takeover : the underexcitation limiter signal acts as a lower limit on the voltage regulator main signal which then becomes the excitation voltage.
Model inputs and output
The input signals are :
Variable | Description | Unit |
---|---|---|
itPu | Complex stator current | pu (base SnRef, UNom) |
utPu | Complex stator voltage | pu (base UNom) |
VfPu | Excitation system stabilizer signal | pu |
The output signal is UUelPu, the underexcitation limiter voltage in pu (base UNom).
Model parameters
Parameter | Description | Unit | Value |
---|---|---|---|
Kuc | UEL center setting | pu | 1.38 |
Kuf | UEL excitation system stabilizer gain | pu | 3.3 |
Kui | UEL integral gain | pu | 0 |
Kul | UEL proportional gain | pu | 100 |
Kur | UEL radius setting | pu | 1.95 |
tU1 | UEL first lead time constant | s | 0 |
tU2 | UEL first lag time constant | s | 0.05 |
tU3 | UEL second lead time constant | s | 0 |
tU4 | UEL second lag time constant | s | 0 |
VUcMaxPu | UEL maximum voltage magnitude | pu (base UNom) | 5.8 |
VUiMaxPu | UEL maximum output | pu (base UNom) | 18 |
VUiMinPu | UEL minimum output | pu (base UNom) | 18 |
VUrMaxPu | UEL maximum radius | pu (base UNom) | 5.8 |
Model diagram
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
- 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