smart devices - uk power networks...• load blinded doc (alstom micom p142) proved as suitable...

Smart Devices

Session 3c:

Gilbert Manhangwe | UK Power Networks

2011. UK Power Networks. All rights reserved

FPP

Smart

Devices

Trials

Smart Devices Overview

Release capacity

headroom on

constrained parallel

circuits

Increase utilisation

of existing network

assets

Provide alternative for DOC

protection

Create voltage head/legroom

to accommodate DGs

2

Quadrature-booster Overview

3


Quadrature-booster Overview

Wissington

33kV

Wissington

CHP

Northwold

Swaffham

Grid

G

123

Downham

Market

Southery

Kings Lynn

South Grid /

Waltington

March Grid

via

Littleport

11.07km

8.154km

5.3

6km

8.275km

33kV

11kV6.31km

Walsoken Grid

via

Outwell Moors

50%

100%

Simplified Trial 33kV Network Specialised form of transformer used to

control direction of real power flow in

parallel circuits

Seasonal

Export Limits

50%

4


Quadrature-booster Learning Outcomes

• Quadrature-booster works on distribution networks

Quadrature-booster on line

26/07/13

5


• FATs to depict actual network on which plant is to be used

All tests to be agreed at design review stage

Quadrature-booster Learning Outcomes cont’d

• Now have better understanding of Quadrature-boosters for distribution networks

Refine phase angle to achieve finer step changes

Easier modelling and placing bucking/boosting

• Installation, operation & maintenance are similar to equivalent power transformers

• QBCS logic varies as distribution network configuration evolves

What can we do differently in future?

• Produced protection scheme template for first QB – with support from Mott MacDonald,

and validation using RTDS by Alstom Grid

6


Dynamic Line Rating Overview

• Use DLR to control flexible generation on 33kV networks

• Identify opportunities to optimise DLR settings

• Consider use of a “centralised” DLR system

Four DLR systems installed across FPP trial area

Objectives

Alstom P341

relay

Weather

Station

7


Dynamic Line Rating Learning Outcomes

• Centralised DLR systems are possible (within 21km)

• CIGRE 207 model can be replicated to within ± 2% of DLR Relay output

• 47% additional amapacity uplift compared to summer

static ratings

8MW DG to be controlled against DLR output

Key Weather

Elements

Outcome (Pearson’s coefficient of correlation)

Ambient Temperature Highly correlated (0.99)

Wind velocity 10min rolling averages provide adequate representation

Wind direction Highly variable (0.43)

8


• Create voltage head/legroom by optimising target voltage at 33kV and 11kV

Automatic Voltage Control Overview

9



Unmask DG output

in feeder

measurements

Optimise target

voltage using

ANM

Calculate

dynamic (true)

load

Calculate ‘true’

target voltage &

LDC bias

10

• Create voltage head/legroom by optimising target voltage at 33kV and 11kV


Unmask DG output

in feeder

measurements

Optimise target

voltage using

ANM

Calculate

dynamic (true)

load

Calculate ‘true’

target voltage &

LDC bias

Remote

measurements

from existing

SCADA

ANM

Calculate basic

target voltage

Calculate dynamic

(true) load ratio

Update target

voltage at

March Grid

33kV network

11kV network Update dynamic

load ratio at

March Primary

33kV & 11kV

Calculation

Algorithms

SuperTAPP n+

11

Automatic Voltage Control Learning Outcomes

• Voltage which would be applied by Standard AVC

significantly less than expected

Improved

Target

Voltage

Improved

Generation & LDC

boost estimations

• A first in updating Load Ratio in SuperTAPP n+ application 12


Novel Protection Relays Overview

Objectives

• Provide alternative to DOC protection – increase reverse power capacity

• Prevent mal-operation of DOC during export conditions

Standard DOC

(control/tripping mode)

DOC with load blinder functions

(monitoring/alarming mode)

Combined DNPS & DVDO system

(monitoring/alarming mode)

4 x P142 feeder

management relays

installed

Operational

Trial

13


Novel Protection Relays Learning Outcome

• Load blinder on/off events due to poor power factor at low loads – additional

tolerance must be added to maximum load angle

±0.85 power factor envelope was considered maximum allowable

• DNPS & DVDO stability was confirmed, and template settings established

• Load blinded DOC (Alstom Micom P142) proved as suitable mechanism for

increasing available export capacity in 132/33kV Grid Transformer

applications

Suitable for sites supplied from a single 132kV node

Further work required for sites supplied from multiple 132kV nodes

14


For more information visit ukpowernetworks.co.uk/innovation

15

Successful deployment of new commercial arrangements and interoperable

smart grid components to deliver faster and cheaper DG connections

Engaged with 50+ DG developers

Interviewed 20

Trialled two DG access principles:

LIFO and Pro–rata capacity quota

Made 40 connection offers:

• 15 accepted, 54.4MW enabled,

£44m savings

Commissioned RF mesh wireless

network for wide area comms

Developed analysis tool for

investment options in DG

dominated networks

Integrated and commissioned smart

devices across 12 sites

Deployed IEC 61850 for

interoperability between solution

components

Installed and commissioned first

quad-booster at 33kV

Key achievements of Flexible Plug and Play

smart devices - uk power networks...• load blinded doc (alstom micom p142) proved as suitable...

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