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CIM Issues #5313

Better description for governorSCD

Added by Yang Feng about 2 years ago. Updated about 1 year ago.

Status:
New
Priority:
Low
Author/Contact Info:
Base Release:
Solution to be Applied To:
CIM18
Solution Version:
Solution Applied By:
Completion Date:
CIM Keywords:
61970-Production
Breaking Change:
Yes
Breaking Change Description:
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

The current description is: Governor Speed Changer Droop. This is the change in generator power output divided by the change in frequency normalized by the nominal power of the generator and the nominal frequency and expressed in percent and negated. A positive value of speed change droop provides additional generator output upon a drop in frequency.

We use the term “Governor Speed Changer Droop” One could read this as the droop if the speed changer of the governor. Is this what we want? Could we just say “Governor speed droop”

Then the rest defines “the change in generator power output divided by the change in frequency” which is deltaP/delta_f. I guess this maybe also works, but I see it mostly defined change of frequency divided by change of change of P.
Then we have – normalized, percent, negated,… Maybe we can just write as equation.

The description becomes cumbersome to describe the behavior, could be improved by incorporating an equation.

#1

Updated by Chavdar Ivanov about 2 years ago

Example from Marcos Olmos
Generator PR: 100MW, fR=50Hz
Kr=3 MW/Hz
governorSCD = ( delta P/PR) / (delta f/fR) = (3MW/100MW) / (1Hz/50Hz) = 150%

Links from Chavdar
Microsoft Word - Item 12i - Memo from Etter to Board re Compensation 07Dec2016.docx (nerc.com): https://www.nerc.com/pa/Stand/BAL001TRE1/BAL-001-TRE-1%20Redline.pdf
Microsoft Word - Wsccgov1.doc (wecc.org): https://www.wecc.org/Reliability/Governor%20Tutorial.pdf

#2

Updated by Yang Feng over 1 year ago

WG13 has agreed to include the equation to replace the context, the proposed context will be sent to WG13 for review later.

#3

Updated by Domagoj Peharda about 1 year ago

  • Breaking Change changed from No to Yes

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