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Confe
rence
ACTIVELY MANAGING
DISTRIBUTION CONNECTED
GENERATION FEEDING INTO
DISTRIBUTION AND
TRANSMISSION CONTRAINTS
Session 1B / R Anderson & A Gooding /
United Kingdom
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Confe
rence Iberdrola at a Glance
Presence in 40 countries worldwide
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Confe
rence SP Energy Networks Overview
• Distribution Assets
- 3.5m connected customers
- 16% of annual electricity bill
- Host 28% of UK’s distributed
renewable generation but
only 14% of customer base
• Transmission Assets
(Scotland)
- 4% of annual electricity bill
- 56% of Scotland’s
transmission connected
renewable generation
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Confe
rence Agenda
• Background
• The Problem
• The Solution
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Confe
rence Problem
Trial Area
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Confe
rence Problem
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Confe
rence The Problem
• Exporting Grid Supply Point
• Multiple issues during N-1 Contingencies
• High cost connection charges as a consequence of thermal
constraints
• High cost connection charges as a consequence of voltage
rise constraints
• The impact of Small Scale Generation on the Exporting GSP
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Confe
rence
60 MVA
Limit
Firm Capacity Calculated based upon Maximum Generation / Minimum Demand
Managing Constraints at GSP
120 MVA
Limit
62 MW
Unconstrained
Grid Supply
Point
132kV
33kV
Transmission
Network
Distribution
Network
Demand
Min 10 MW –
Max 36 MW
Max
Generation
Min Demand Network
Capacity
Available
Capacity
Fully Intact 110 MVA 10 MVA 120 MVA + 20 MVA
N-1 110 MVA 10 MVA 60 MVA - 40 MVA
48 MW
Constrained
9 MW
ANM
Controlled
27 MW
ANM
Controlled
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Confe
rence Managing Constraints at GSP
Connection Transmission Reinforcement Cost Estimate - £20M
Connection Date beyond 2020
Both New Sites Have Planning!
62 MW
Unconstrained
Transmission
Network
Demand
Min 10 MW – Max
36 MW
120 MVA
Limit90MVA90MVA
48 MW
Constrained
9 MW
ANM Controlled
27 MW
ANM Controlled
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Confe
rence The Solution
• Accelerating Renewable Connections
www.arc-project.com
• £8.4M project funded through the Low Carbon Network Fund
managed by OFGEM
• Project Partners
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Confe
rence The Solution
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Confe
rence The Solution
Requirements for an Actively Managed Network:
• Operate autonomously
• Hard real time
• End to end determinism
• State driven logic
• Constant idling rather then event initiated
• Predictable and repeatedly able to handle relationships
between multiple devices and multiple constraints
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Confe
rence The Solution – A New Layer
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Confe
rence The Solution – Top Down ANM
132/33kV
60MVA
132/33kV
60MVA
Wind Farm 1
62.5 MW
33/11kV
7.5MVA
33/11kV
7.5MVA
5 MW 22.5 MWWind Farm 2
48 MW 33/11kV33/11kV
Wind Farm 3
9 MW
Energy From Waste Plant
3 3
3
MP1 MP2
MP3
MP4 = MP1 + MP2
Existing Communications
8.5 MW
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Confe
rence The Solution
Commercial Arrangements:
• Non-Firm connection agreements
- Estimation of annual curtailment
- No compensation for curtailment (Up front benefit banked!)
• Managing constraints across boundaries
- Agreement with the TNO and TSO to manage constraints
created by distribution connected generation
• Investigating new community connection to encourage local
demand or storage interaction
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Confe
rence The Solution
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Confe
rence The Solution
Thank You
Alan Gooding
Commercial Director, Smarter Grid Solutions
www.smartergridsolutions.com
Ross Anderson
Senior Design Engineer, SP Energy Networks
www.spenergynetworks.co.uk
