CIM Issues #6785
Modelling of Ward and Extended Ward Equivalent by EquivalentInjection
61970-301, 61970-452
Description
The current EquivalentInjection jas some gaps that prevent to use it to represent ward or extended ward equivalent.
Therefore it is recommended to apply the following changes:
- Add attribute EquivalentInjection.kind, type EquivalentInjectionKind
- add enumeration EquivalentInjectionKind
- add enum quivalentInjectionKind.ward
- add enum quivalentInjectionKind.extendedWard
- move r, x, from SC profile to EQ profile as they can be used for the power flow calculation. The negative and zero sequence should stay in SC profile
Define a rule that ward equivalent cannot be regulating voltage so we have dependency between the .kind attribute and the attributes related to the regulating capability
There could be an option to reuse the regulatingCapability instead of adding .kind, but we will need to refer to ward and extended ward in the description
Some references
ward: https://pandapower.readthedocs.io/en/v2.1.0/elements/ward.html
extended ward: https://pandapower.readthedocs.io/en/v2.1.0/elements/xward.html
Decision
15 May 2024
we agree to create 2 subclasses: WardEquivalent ExtendedWardEquivalent
- ExtendedWardEquivalent would have r, x, and the regulating status and voltage attributes all required attributes in the profile
- EquivalentInjection will be abstract in the profile
Martin will double check.
Marting replied - see notes.
The issue can be implemented and closed
Release Notes
The following classes were added WardEquivalent ExtendedWardEquivalent
The ExtendedWardEquivalent has r, x, and the regulating status and voltage attributes all required attributes in the profile. The attributes are moved from EquivalentInjection. ExtendedWardEquivalent gets r0, r2, x0, x2 as part of the SC profiles
EquivalentInjection is abstract in the profile
The association with ReactiveCapabilityCurve is moved to ExtendedWardequivalent
Attribute regulationCapability is deleted as ExtendedWardEquivalent always has the capability to regulate. The regulationStatus is kept for SSH usage to have the ability to deactivate the voltage control although this is also questionable as this will turn the Extended ward to a ward.
Changes are applied in EQ, SC and SSH profiles.
Updated by Chavdar Ivanov 2 months ago
Reply from Martin
Following up on my homework action item, I've determined that the cases
in which the existence of r and x doesn't match the regulating status
only occurs for SynchronousMachines and not for EquivalentInjection, so
that will not conflict with the ward/extended ward model.
-Martin Miller
Updated by Chavdar Ivanov about 1 month ago
- Status changed from New to Open
- Solution to be Applied To set to CIM18v11
- Solution Version set to CIM18v11
- Solution Applied By set to Chavdar Ivanov
- Completion Date set to 06/04/2024
- Breaking Change changed from No to Yes
- Breaking Change Description set to Attributes are moved
- Release Notes updated (diff)