Transcript PDCWG Report to ROS David Kee Chair CPS Energy Sydney Niemeyer Vice Chair NRG Energy.

PDCWG
Report to ROS
David Kee Chair
CPS Energy
Sydney Niemeyer Vice Chair
NRG Energy
November 28th meeting
• Topics
– NPRR486
– RRS
– GADS summary
– GREDP review
– Event analysis process
– Event analysis
– ERCOT Frequency Control
• Next meeting Jan 24, 2013
NPRR 486
• PDCWG recommends to continue to table
this NPRR
• ERCOT system tuning is scheduled for
early January with analysis and report to
PDCWG by February (tentative)
• PDCWG will be prepared to provide ROS
its report by the March 2013 ROS meeting
(tentative)
RRS
• Group continues to define issues
– Qualification & Testing requirements
– Performance requirements
• Clear definition of the two issues noted is
new focus
• Compliance evaluation of performance is
being combined with Qualification and
Testing requirements
• PDCWG will continue to work to propose
clarifications which will allow for clear
compliance evaluation
GADS Summary
• TRE presented GADS summary
– Information will be used to help identify
contributions to poor performance by
generator type
– Wind Generators required to report GADS
data beginning January 2013.
GREDP Review
• ERCOT presented results
– Conventional unit analysis resulted with 99%
passing
– IRR unit analysis resulted with more failures
– PDCWG consensus that GREDP metric has
flaws and does need overhaul
– PDCWG plans to work with QMWG to update
and align the metric with reliability needs
Event Analysis Process
• PDCWG identified the need for additional
telemetry to effectively evaluate Combined
Cycles with Power Augmentation
• ERCOT will work to draft appropriate
language to add the requirement to
protocols and guides
Event Analysis
– 10/5/12
• System did not meet 420MW/0.1Hz minimum
response (failed event)
• Causes identified as low online capacity over RRS
obligation and some RRS was being carried on
power augmentation of Combined Cycle resources
Event Analysis
– 10/25/12
• System did meet 420MW/0.1Hz minimum
response (passed event)
• Cause was attributed to excess reserves online
over the RRS obligation allowing for adequate
frequency response
Event Analysis
– 11/2/12 – DCS
• System did meet 420MW/0.1Hz minimum
response (passed event)
• System recovered in 9 seconds
• Cause was LR carrying RRS tripped UFR
• Concern:
– Proposed increase in quantity of LR that RRS can carry
– If in place overshoot could occur in this condition
– If more LR trip than Generator MW loss, frequency rise
will increase risk of large steam units lifting safeties. This
leads to risk of safeties not seating and additional loss of
generation. Models can not model for this extended
period.
Event Analysis
– 11/9/12
•
•
•
•
Slow system response
Resources were overall slow to respond
Data delay was noted on several resources
Sense of over deployment of regulation resulting in
oscillations
• Tuning (slide 3) is expected to correct this issue
Example of “over-deployment” of
Regulation Service contributing to
frequency oscillations and excess
generation movement.
ERCOT Frequency Control
• Nov. 9 control issues
– Possible cause was ERCOT transfer to
backup control center
– Control issues due to large generator
deviation. Possibly due to the backup center
issue
• Time Error correction changes
– Expected a shift of the frequency distribution
ERCOT CPS2 By Day - November-2012
ERCOT Monthly CPS2 =
97.6
100%
70000
66500
98%
63000
59500
96%
56000
52500
94%
49000
NERC CPS 2
92%
42000
38500
90%
35000
31500
88%
28000
24500
86%
21000
17500
84%
14000
10500
82%
7000
3500
80%
0
1
2
3
4
5
6
7
8
9
10
11 12
13 14 15
16 17 18
19 20
Day
CPS 2
Avg CPS 2
Peak Energy
21 22 23
24 25 26
27 28 29
30
ERCOT Peak Energy
45500
CPS1 Average
ERCOT CPS1
170
170
160
160
150
150
140
140
130
130
120
120
110
110
100
100
Monthly Average
12 Month Rolling Average
ERCOT CPS2 Score*
100
95
CPS2
90
85
80
75
70
Month
CPS2
Trend (Monthly CPS2 Score)
*ERCOT as a single
control area is exempt
from CPS2. These
scores are For
Information Only
1/
1
7/ /20
1/ 00
1/ 200
1/ 0
7/ 20
1/ 01
1/ 20
1/ 01
7/ 20
1/ 02
1/ 200
1/ 2
7/ 20
1/ 03
1/ 200
1/ 3
7/ 20
1/ 04
1/ 20
1/ 04
7/ 20
1/ 05
1/ 200
1 5
7/ /20
1/ 06
1/ 20
1/ 06
7/ 200
1 7
1/ /20
1 07
7/ /20
1/ 08
1/ 200
1/ 8
7/ 20
1/ 09
1/ 20
1/ 09
7/ 20
1/ 10
1/ 201
1/ 0
7/ 20
1/ 11
1/ 201
1/ 1
7/ 20
1/ 12
20
12
Daily RMS1 of ERCOT Frequency
Through Nov 26, 2012
0.0500
0.0450
0.0400
0.0350
0.0300
0.0250
0.0200
0.0150
0.0100
1/
4/1/20
7/1/2004
10 1/2 0
/1 004
1/ /20 4
4/1/2004
7/1/2005
10 1/2 0
/1 005
1/ /20 5
4/1/2005
7/1/2006
10 1/2 0
/1 006
1/ /20 6
4/1/2006
1
7/ /2007
10 1/ 0
/1 2 0 7
1/ /20 07
1
4/ /2007
7/1/2008
10 1/ 0
/1 2 0 8
1/ /20 08
4/1/2008
7/1/2009
10 1/ 0
/1 2 0 9
1/ /20 09
4/1/2009
7/1/2010
10 1/ 1
/1 2 0 0
1/ /20 10
4/1/2010
7/1/2011
10 1/ 1
/1 2 0 1
1/ /20 11
4/1/2011
7/1/2012
10 1/2 1
/1 012
/2 2
01
2
Daily RMS1 of ERCOT Frequency
Through Nov 26, 2012
0.0500
0.0450
0.0400
0.0350
0.0300
0.0250
0.0200
0.0150
0.0100
1/
4/ 200
1/ 7
7/ 200
1 7
1 0 /2 0
/1 0 7
/2
1/ 00
1/ 7
4/ 200
1/ 8
7/ 200
1 8
1 0 /2 0
/1 0 8
/2
1/ 00
1/ 8
4/ 200
1/ 9
7/ 200
1 9
1 0 /2 0
/1 0 9
/2
1/ 00
1/ 9
4/ 201
1/ 0
7/ 201
1 0
1 0 /2 0
/1 1 0
/2
1/ 01
1/ 0
4/ 201
1/ 1
7/ 201
1 1
1 0 /2 0
/1 1 1
/2
1/ 01
1/ 1
4/ 201
1/ 2
7/ 201
1 2
1 0 /2 0
/1 1 2
/2
01
2
1/
Daily RMS1 of ERCOT Frequency
Through Nov 26, 2012
0.0500
0.0450
0.0400
0.0350
0.0300
0.0250
0.0200
0.0150
0.0100
ERCOT Frequency Control
• Time Error correction changes
– Expected a shift of the frequency distribution
– Noted a small shift toward center in monthly
distributions when compared to the year to
date distribution
– No Time Error corrections during the first 26
days of November due to the change in
process to 30 seconds.
60
60
60
60
60
60
60
60
60
60
60
59
59
59
59
59
59
59
59
59
59
.1
00
.0
90
.0
80
.0
70
.0
60
.0
50
.0
40
.0
30
.0
20
.0
10
.0
00
.9
90
.9
80
.9
70
.9
60
.9
50
.9
40
.9
30
.9
20
.9
10
.9
00
Comparing October 2010 vs October 2011 profile
of frequency in 5 mHz bins
0.12
0.1
0.08
0.06
Oct-10
Oct-12
0.04
0.02
0
Comparing November 2010
vs November 2011 profile of frequency in 5 mHz bins
0.12
Through Nov 26, 2012
0.1
0.08
0.06
Nov-10
Nov-12
0.04
0.02
.1
00
60
.0
90
60
.0
80
60
.0
70
60
.0
60
60
.0
50
60
.0
40
60
.0
30
60
.0
20
60
.0
10
60
.0
00
60
.9
90
59
.9
80
59
.9
70
59
.9
60
59
.9
50
59
.9
40
59
.9
30
59
.9
20
59
.9
10
59
59
.9
00
0
ERCOT Frequency Profile Comparison
January through December of each Year
50000
Through Nov 26, 2012
45000
35000
30000
25000
20000
15000
10000
5000
60
.0
1
60
.0
2
60
.0
3
60
.0
4
60
.0
5
60
.0
6
60
.0
7
60
.0
8
60
.0
9
60
.1
60
0
59
.9
59
.9
1
59
.9
2
59
.9
3
59
.9
4
59
.9
5
59
.9
6
59
.9
7
59
.9
8
59
.9
9
One Minute Occurances
40000
2010
2012
Questions?