dn operation
Post on 24-Jan-2016
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Responsibilities
Licence Holder Obligation For 1 In 20 Capacity
DNCC Operates Networks Under Direction of The DN Winter / Summer Operating Strategy Booked Capacities Short Term Variations DN Specific Issues
DNCC Makes Within-Day Decisions Regarding Supply Demand Balancing Control of Unbilled Energy Plant Outage
Planned Unplanned (faults)
Daily Operations – Key Stages
Forecast Demand Define Diurnal Profile Programme Intakes Manage Demand Changes Respond to NTS Change Requests
Demands and Temperature Relationship
0 5 10 15 20 254
6
8
10
12
14
16
18
20
Temperatures
Dem
and
s
Demand
1ºC = 6%
1ºC = 3%
1ºC = 2%
Define Diurnal Profile
Diurnal Swing in the Range 12 – 15% Significance of Minimum Stock Time Storage Deficit in most DNs Storage Utilisation in Defined Order
DN Linepack DN LP Storage DN Bullets NTS Flow Variation
Diurnal Profiles
Supply Rate
1200 1800 2400 06000600
DemandProfile
B
C
AA
Storage Requirement
A + B - C
Empty Holders &Linepack,
FillHolders &Linepack
Programme Intakes
Remote Control of Offtake Utilisation Notifications to NTS via OPN Process Day Ahead and Within Day Considerations Meet Sub-LDZ Flow Requirements Pressure vs Volumetric Control Shrinkage Considerations Plant Outage Reflective of OCS Where Possible Request Additional Flow Flex via OPN Where
Necessary
Theddlethorpe Gas(38.2 - 38.7 MJ - m3)
Bacton Gas(38.2 - 38.6 MJ/m3)
St Fergus / Teesside Gas(39.2 - 41.5 MJ/m3)
St Fergus Gas(40 - 41.5 MJ/m3)
Easington/Rough Gas(38.1 - 38.7 MJ/m3)
St Fergus / Barrow Gas(38.4 - 41.5 MJ/m3)
CV Management
Manage Demand Changes
Forecast Updated 8 Times Daily (UNC timings) plus up to 5 ad-hoc.
Respond to Revised Weather Data Xmas period 2005; 5 degree error within day.
Rebalance DN Supply to Meet Demand Changes Revised Offtake Rates Impact on storage requirement Allocation to Volumetric Offtakes; balance effect of
pressure control?
Respond to NTS Change Requests
NTS To Anticipate Supply Rate Changes, Commercially and Physically Driven
NTS Outages Planned e.g. On-Line Inspection Un-Planned e.g. Faults
NTS VLDMC renominations
DNCC Offtake Performance
Booked Flat Capacity Limits Observed at DN Level Booked Flow Flex Limits Exceeded at LDZ Level
Some Offtakes on Some Days Pressure Controlled Flows Defined by Consumers
Within-day demand changes flow through into FlowFlex calculation.
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