Historical Ramp Rate Analysis
Augustine Caven
Generation Department
Special OC Session
March 22, 2016
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Historical Ramp Rate Analysis
•
•
•
A 3-month historical analysis of unit ramp rate performance should be
performed using actual operations data from January 1 through March
31, 2016.
If the generator was not dispatched in the above time range, then use
last summer’s actual operations data from June 1 – August 31, 2015.
Based on the results of the historical analysis, the following ramp rate
parameters in Markets Gateway should be updated:
– Default Ramp Rate on the “Unit - Detail” tab in Markets Gateway. Used in
DA Market (and in RT SCED only if Segmented ramp rates not entered).
– Segmented Ramp Rate on “Unit - Energy Ramp Rates” tab in Markets
Gateway. Not used in DA Market, but used in RT SCED if values are
entered.
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Criteria for the Historical Analysis
•
Members should apply the following criteria to further screen the operational
data used in their historical analysis:
– The unit was considered dispatchable by PJM – i.e. not self-scheduled,
testing, taken over by company, cancelled, and other non-dispatchable
scheduled on reasons.
– The unit did not have “Fixed Gen” status in Markets Gateway, or have
its Eco Min = Eco Max.
– The unit was operating within dispatchable range, i.e. Eco Min ≤ Output ≤
Eco Max.
• Excludes any startup operation or soaking hours prior to a unit being dispatchable
– The unit was not assigned either regulation or spinning, and was not
responding to a spinning event.
– The unit was receiving a “Raise” Economic Base Point from PJM.
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Minute Level Historical Analysis
•
The minute level historical analysis should be
performed by reviewing minute level data
samples of unit MW output responses to a
raise PJM Base Point signal.
•
The difference in unit MW output from one
minute to the next results in the minute level
MW/min ramp rate.
•
In the example, Unit A exhibited:
– Average Ramp Rate of 6.8 MW/min
– Maximum Ramp Rate of 10.0 MW/min
•
Therefore, a ramp rate entered into Markets
Gateway between 6.8 and 10 MW/min would
be considered acceptable to PJM.
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Unit A (Default Ramp Rate)
Bid-In Parameters
Economic Minimum:
Economic Maximum:
Default Ramp Rate:
Time
9:59
10:00
10:01
10:02
10:03
10:04
10:05
10:06
10:07
10:08
10:09
10:10
10:11
10:12
10:13
*Yellow Shaded
Min Ramp Rate:
Max Ramp Rate
Average Ramp Rate:
100 MW
200 MW
5 MW/min
(Full Raise based on 15 min look ahead = 75 MW)
MW Output
MW/min Ramp PJM Base Point
100
100
100
175
105
5
175
115
10
175
124
9
175
133
9
175
140
7
175
147
7
175
155
8
175
163
8
175
170
7
175
174
4
175
175
1
175
175
0
175
175
0
175
1
10
6.8
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Segmented Ramp Rate Example
Unit B (Segmented Ramp Rate)
•
•
For units with segmented ramp rates entered, the
minute level historical analysis should be performed
for each MW Ramp segment.
In the example, Unit B exhibited the following:
- Segment 1: Not considered – Start up segment
- Segment 2:
•
•
Average Ramp Rate of 5 MW/min
Maximum Ramp Rate of 7 MW/min
- Segment 3: (Mill Point Segment)
•
•
Average Ramp Rate of 0 MW/min
Maximum Ramp Rate of 0 MW/min
- Segment 4:
•
•
•
•
Average Ramp Rate of 12.5 MW/min
Maximum Ramp Rate of 17.0 MW/min
Segmented Ramp Rate values within the Average
and Maximum values for Segments 2, and 4 should
be entered in Markets Gateway.
For Segment 3, the mill point segment, a non-zero
fractional ramp rate should be entered.
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Bid-In Parameters
Economic Minimum:
Bid-In Segmented Ramp Rates:
100 MW
Economic Maximum:
Segment
1
2
3
4
MW
100
150
153
200
Bid-In
Ramp Rate (MW/min)
2
3
0.2
10
Time
9:59
10:00
10:01
10:02
10:03
10:04
10:05
10:06
10:07
10:08
10:09
10:10
10:11
10:12
10:13
10:14
10:15
10:16
10:17
10:18
10:19
10:20
MW Output
100
100
104
110
117
124
130
136
141
145
145
145
148
150
150
150
150
155
167
184
200
200
MW/min Ramp
4
6
7
7
6
6
5
4
3
2
0
0
0
5
12
17
15
-
Segment
1 (Start-up)
2
3
4
Historical Segmented Ramp Analysis
Min Ramp Rate
Max RampRate
N/A
N/A
2
7
0
0
3
17
200 MW
PJM Base Point
100
145
145
145
145
145
145
145
145
145
145
183
183
183
183
183
183
183
183
200
200
200
Average Ramp Rate
N/A
5.00
0.00
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12.50
Questions?
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