Review of Power System Operation
2009
Michael Kelly
Daily Load Shape
2006
Daily Load Shape
2007
Daily Load Shape
2008
Daily Load Shape
2009
Demand Reduction
Wind Stats
• 1161 MW installed (30/9/09)
– 16% of total capacity installed 7,174 MW(6,013+1,161)
• 999 MW max output (12/8/09)
– 43% of system demand (8/9/09)
• 0.1% of energy dispatched off (year to 30/9/09)
Wind PenetrationWind as percentage of System Demand
2009 daily min and max values
0
5
10
15
20
25
30
35
40
45
50
01
/01
/09
15
/01
/09
29
/01
/09
12
/02
/09
26
/02
/09
12
/03
/09
26
/03
/09
09
/04
/09
23
/04
/09
07
/05
/09
21
/05
/09
04
/06
/09
18
/06
/09
02
/07
/09
16
/07
/09
30
/07
/09
13
/08
/09
27
/08
/09
10
/09
/09
24
/09
/09
Date
%
Min 0.18 % on 13th Aug 2009 Max 43.2 % on 8th Sep 2009
Impacts• Lower risk of supply shortage
– Greater opportunity for transmission and generation maintenance
– Amber alerts 2008 = 33, 2009 = 2 (to date)
• Changed running regimes– Base load to mid merit
– Mid merit to peaking
• Greater Opportunity for transmission maintenance– Localised transmission restrictions
North West Transmission System• 2nd Oct 13:29
– 2 110kV lines on maintenance
– high wind and low demand
– 110kV Line from Golagh to Cathleen’s Fall is over loaded
Increasing Cycling of Generators
No of starts 2008 2009 % Increase
Base Load units 149 188 26%
Total Starts 5882 7254 23%
Performance Monitoring Why?• Need to know capability of system:
– Existing: Performance vs Standard– Impact of Changes e.g. Generation Portfolio
• Grid Code– Non Compliance of one user can result in lack
of access for another user and / or cost to end customer
Performance Monitoring What?
• Looked at some metrics from existing systems
• Will be discussing these with Users
• Developing a software system to produce regular reports
• Incentives…
• Contact: [email protected]
Best New Entrant
Wind Farm Control
• Direct control of 457 MW of wind from NCC
• Example
– 2nd Oct 13:29
– 110kV Line from Golagh to Cathleen’s Fall is over loaded
Winter 2009/2010
• Available Capacity– Conventional 6,013 MW– Wind 1,250 MW installed, 250 MW reliance
• Peak – 4,680 MW– 226 MW below 4,906 MW in December 2007
End
