OEL4C
Reviewers: Lampros Papangelis (CRESYM)
IEEE OEL4C 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 inputs and output
The input signals are :
| Variable | Description | Unit |
|---|---|---|
| QGenPu | Reactive power generated by the synchronous machine | pu (base SnRef) |
| QRefPu | Reference reactive power | pu (base SnRef) |
They both follow the generator convention.
The output signal is UOelPu, the overexcitation limiter voltage in pu (base UNom).
Model parameters
| Parameter | Description | Unit | Value |
|---|---|---|---|
| Ki | OEL integral gain | pu | 1 |
| Kp | OEL proportional gain | pu | 1 |
| tDelay | OEL integral time constant | s | 20 |
| VMinPu | OEL minimum output | pu (base UNom) | -0.2 |
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