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CIM Issues #5113

NonlinearShuntCompensator has ambiguity in definition of per section or total

Added by Domagoj Peharda about 3 years ago. Updated about 1 year ago.

Status:
Closed
Priority:
Normal
Author/Contact Info:
Domagoj Peharda / domagoj.peharda@koncar-ket.hr
Base Release:
Solution to be Applied To:
CIM18v03
Solution Version:
CIM18v03
Solution Applied By:
Chavdar Ivanov
Completion Date:
02/11/2023
CIM Keywords:
61970-Wires
Breaking Change:
Yes
Breaking Change Description:
Some attributes were renamed.
CIM Impacted Groups:
WG13
Requestor:
Standard(s):
Version:
Clause:
Sub-Clause:
Paragraph:
Table:
Originally Closed in Version:
Origination Date:
Origination ID:
Originally Assigned To:

Description

NonlinearShuntCompensator has ambiguity where NonlinearShuntCompensator class has description where it says: "The attributes g, b, g0 and b0 of the associated NonlinearShuntCompensatorPoint describe the total conductance and admittance of a NonlinearShuntCompensatorPoint at a section number specified by NonlinearShuntCompensatorPoint.sectionNumber." This describes total admittance model.
In NonlinearShuntCompensatorPoint.b there is this note: "Positive sequence shunt (charging) susceptance per section." This describes additive admittance model.
These two notes are contradictory. NonlinearShuntCompensatorPoint should be aligned with NonlinearShuntCompensator.
Additive admittance model cannot model variable shunt reactor where admittance is decreasing with increasing section which is problem for conductance (negative conductance is not possible to enter).

Proposed Solution

NonlinearShuntCompensatorPoint should be aligned with NonlinearShuntCompensator.
Proposed change to the NonlinearShuntCompensatorPoint:
b bTotal: Positive sequence shunt (charging) susceptance per section. Total positive sequence shunt (charging) susceptance at section noted by sectionNumber.
b0 b0Total: Zero sequence shunt (charging) susceptance per section. Total zero sequence shunt (charging) susceptance at section noted by sectionNumber.
g gTotal: Positive sequence shunt (charging) conductance per section. Total positive sequence shunt (charging) conductance at section noted by sectionNumber.
g0 g0Total: Zero sequence shunt (charging) conductance per section. Total zero sequence shunt (charging) conductance at section noted by sectionNumber.

Decision

NonlinearShuntCompensatorPoint should be aligned with NonlinearShuntCompensator.
Proposed change to the NonlinearShuntCompensatorPoint:
b is replaced with bTotal: Total positive sequence shunt (charging) susceptance at section noted by sectionNumber.
b0 is replaced with b0Total: Total zero sequence shunt (charging) susceptance at section noted by sectionNumber.
g is replaced with gTotal: Total positive sequence shunt (charging) conductance at section noted by sectionNumber.
g0 is replaced with g0Total: Total zero sequence shunt (charging) conductance at section noted by sectionNumber.

Release Notes

Applied the following changes
Change to the NonlinearShuntCompensatorPoint:
b is replaced with bTotal: Total positive sequence shunt (charging) susceptance at section noted by sectionNumber.
b0 is replaced with b0Total: Total zero sequence shunt (charging) susceptance at section noted by sectionNumber.
g is replaced with gTotal: Total positive sequence shunt (charging) conductance at section noted by sectionNumber.
g0 is replaced with g0Total: Total zero sequence shunt (charging) conductance at section noted by sectionNumber.

Modified the description of the NonlinearShuntCompensator to refere to the new attributes

Applied similar changes to the NonlinearShuntCompensatorPhase and NonlinearShuntCompensatorPhasePoint as well

Modified EQ and SC profiles in 61970-452.

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