What is Active Network Management

19 Pages·2012·0.86 MB·English

Orkney Active Network Management system
Technical Session 1
Accessing capacity in a constrained network – Active
Network Management
David MacLeman
Distribution R&D Manager
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Accessing capacity in a constrained network
Learning Outcomes
• Understand the concept of ANM
• Identify and assess opportunities to apply ANM
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Accessing capacity in a constrained network
What is Active Network
Management?
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Accessing capacity in a constrained network
Lesson content
• Introduction to Orkney
• The Orkney network – problem definition
• Why Active Network Management?
• Design of an ANM scheme for Orkney
• Interactive session 1
– What makes Orkney suitable for Active Network Management?
– Where else could you apply ANM?
• Review of sessions
• Lessons learnt
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Accessing capacity in a constrained network
Introduction to the Orkney
• High interest in further renewable
generator connections
• Traditional reinforcement solution
would be very expensive
• Spare capacity available due to
patterns of load and generation
• Ofgem incentives:
IFI and DG
Registered Power Zone (RPZ)
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Accessing capacity in a constrained network
Orkney electrical network
Wind farm with rating in MW
2.7MW
• 6 miles off north coast of
Single turbine with rating in MW
Scotland WESTRAY
SANDAY
9.95MW
• 11,500 customers
Open
0.9MW point
Marine Energy with rating in MW
• Min/Max demand: 6/31 MW Fossil Fuel generator ROUSAY Tidal 4MW EDAY STRONSAY
with rating in MW
0.9MW
• 33 kV submarine cables: 2 x 20
BURGAR HILL
15.3 MW 2.55 MW
PotentialConstrained
MW import/export Cable 0.9MW
0.9MW 0.9MW
• Ewxinisdt,i nwga gvee naenrda tgioans a mix of 4Con.st5rain eMdlineW SHCoAnsPtrIaNinSedA cYable
0.9MW
• Existing reactive compensation KIRKWALL
STROMNESS Diesel 15MW 0.9MW
equipment
Wave7MW
• Existing protection-based SCORRADALE
ST MARYS
network management: NORTH HOY
0.85 MW
– Firm Generation (FG)
– Non-Firm Generation (NFG) LYNES0.9SMW 2.0 MWGFaLs O10T.5TMWA 1313kkVV cciirrccuuiitt
33kV interconnector to
Scotland
– Load shedding
33/11kV sub station
Map by Martin Lee 1992 to 2011
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Accessing capacity in a constrained network
American Superconductor DVAR
• Initial Purpose • The solution consists of a ±8
MVAR D-VAR and 2 X 7
- To provide continuous reactive
MVAR, 33 kV switched shunt
power locally on Orkney in order
capacitors.
to maximize the real power (MW)
transfer capability of the sub sea
• The D-VAR solution in place
cables from the mainland.
protects the Orkney Islands’
• -To provide voltage support for power supply from critical
transient conditions such as those contingency events such as
caused by trips and reactor
the loss of one of the two 33
switching.
kilovolt (kV) underwater
power cables that serve the
• -Through maximizing the transfer
capability, help minimize the need islands.
for running peak generation.
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Accessing capacity in a constrained network
Existing generator capacity on Orkney - Firm Generation
DEMAND FG
6 MW 0-26 MW
G
Orkney
FG = (N-1 circuit capacity) + (local minimum
demand)
FG = 20+6 = 26 MW
20 MW 20 MW
Mainland
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Accessing capacity in a constrained network
Post-fault inter-trip - Non Firm Generation
DEMAND NFG FG
6 MW 0-20 MW 0-26 MW
G G
Orkney
NFG = Capacity of both circuits + local
minimum demand - FG
NFG = 20+20+6-26 = 20 MW
20 MW 20 MW
Inter-trip NFG
for N-1
contingency
Mainland
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Accessing capacity in a constrained network
Why Active Network Management?
• Local electrical network capacity
has limits
• Existing planning rules require
unconstrained output of contracted
generation capacity at all times
• Variations in customer demand and
output from renewable generators
changes minute by minute
• Affects network capacity available
to accommodate DG output
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Accessing capacity in a constrained network