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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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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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rence Problem

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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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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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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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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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rence The Solution

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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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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

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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