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CIM Issues #6811

Clean up Equivalent modelling descriptions and classnames

Added by Todd Viegut about 1 month ago.

Status:
New
Priority:
Normal
Author/Contact Info:
Todd Viegut
Base Release:
CIM18
Solution to be Applied To:
CIM18
Solution Version:
Solution Applied By:
Completion Date:
CIM Keywords:
61970-Equivalents
Breaking Change:
Yes
Breaking Change Description:
Class names will be changed
CIM Impacted Groups:
None
Requestor:
Standard(s):

IEC61970-301

Version:
Clause:
Sub-Clause:
Paragraph:
Table:
Originally Closed in Version:
Origination Date:
Origination ID:
Originally Assigned To:

Description

During hybrid meetings in Tokyo on 13-Jun-2024 we reviewed the Equivalent* classes and attributes as it pertains to the 301. We identified deficiencies in the existing modelling and changes from original modelling updates that were done as part of https://redmine.ucaiug.org/issues/5047.

Proposed Solution

Proposed description changes are outlined here:

CHANGE #1 : Current EquivalentInjection description changes:

FROM: "This class represents equivalent injections (generation or load). Voltage regulation is allowed only at the point of connection. Using EquivalentInjection to model a distribution network equivalent is recommended practice instead of using ExternalNetworkInjection-s if it is not necessary that the equivalent contains detailed information representing a short circuit equivalent according to IEC 60909 which is relevant for short circuit studies."

TO: "This class represents networks that have been equivalized using either the ward or extended ward method. "

Existing class description updates (stated here for informational purposes...will not be changed):

WardEquivelent should be: "A ward equivalent is a combination of an impedance load and a PQ load."

ExtendedWardEquivalent should be: "An extended ward equivalent is a combination of an impedance load, a PQ load and as voltage source with an internal impedance."

CHANGE #2 : ExternalNetworkInjection description changes:

FROM: "This class represents the external network and is used for IEC 60909 calculations. It is only used if EquivalentInjection cannot provide the details required by IEC 60909 on short circuit equivalent of an external network."

TO: ??? This is an open TODO as part of this issue.

CHANGE #3 : Create new UML diagrams in the UML that can be generated as part of the 301. This potentially involves cleanup of existing diagrams (for WardEquivalent & ExtendedWardEquivalent) as well as the requirements to include the electrical diagrams.

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