SCRX
SCRX model
This article is incomplete, some sections must be written.
Context
This voltage regulator model appears under the name ExcSCRX in the Common Information Model for Dynamics - Standard Models (2012) (missing reference) and in the IEC 61970-302:2024 version (Commission, 2024).
Model use, assumptions, validity domain and limitations
To be completed
Model inputs and output
The input variables are :
| Variable | Description | Units |
|---|---|---|
| IrPu | rotor current | pu (base SNom, user-selected base voltage) |
| UsPu | measured stator voltage | pu (base UNom) |
| UsRefPu | reference stator voltage | pu (base UNom) |
| UOelPu (optional) | output voltage of overexcitation limiter | pu (base UNom) |
| UPssPu (optional) | output voltage of power system stabilizer | pu (base UNom) |
| UUelPu (optional) | output voltage of underexcitation limiter | pu (base UNom) |
The output signal is EfdPu, the excitation voltage in pu (user-selected base voltage).
Model parameters
| Parameter | Description | Units |
|---|---|---|
| CSwitch | If true, exciter is solid-fed, if false, exciter is bus-fed | - |
| IrThresholdOn | If true, rotor current threshold applies | - |
| K | Voltage regulator gain | pu |
| RcToRfd | Ratio of field discharge resistance to field winding resistance | - |
| tA | Transient gain reduction lead time constant | s |
| tB | Transient gain reduction lag time constant | s |
| tE | Voltage regulator time constant | s |
| VrMaxPu | Maximum output voltage of voltage regulator | pu (user-selected base voltage) |
| VrMinPu | Minimum output voltage of voltage regulator | pu (user-selected base voltage) |
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 | 24/05/2024 |
References
- Commission, I. E. (2024). Energy management system application program interface (EMS-API) Part 302: Common information model (CIM) dynamics. IEC 61970-302. https://webstore.iec.ch/preview/info_iec61970-302%7Bed2.0%7Db.pdf