Distribution Network Visibility

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Nov 18, 2013 (3 years and 9 months ago)

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2012. UK Power Networks. All rights reserved

Distribution Network
Visibility

Low Carbon Networks Fund Tier 1 project


UK Power Networks & PPA Energy


Omer Khan & Sarah Carter





2012. UK Power Networks. All rights reserved

Project Background


London Power Networks area (London)
: All primary substations and more
than
9500
secondary substations equipped with Remote Terminal Units
(RTUs)



Secondary substations RTU under
-
utilised











Opportunity:

Maximise the utilisation of existing infrastructure

Voltage: 3 x phases

Current: 3 x phases

Total Power (
kVA
)

Power Factor

Real Power (kW) and direction

Reactive Power (
kVAr
)

Total Harmonic distortion

Air
temperature

Disturbance recorder

Analogue
limit
excursion events

Harmonics 1
-
15
th


Total power in
kVA

Power factor

1 x phase voltage

Air temperature



2012. UK Power Networks. All rights reserved

Project objectives:


Fully utilise the capabilities of the
primary and secondary

RTUs.
Collection of
additional analogues and new functionalities.


Develop and demonstrate a number of visualisation tools.


Demonstrate the business benefits.
Asset
Optimisation
,
Planning, Connections,
Network
Operations
, Control
.


Evaluate optical sensors (
PowerSense
).

Project highlights:


Automated analysis of existing data from
9500
substations available.


RTU
upgrade has started:
350 completed, to meet target of 600
by end 2012.


Beta version of Distribution Network Visualisation Tool being
trialled
.


Engagement with Business Units (Planning, Connections and Asset Management) to
refine tool and start to
realise

benefits.




2012. UK Power Networks. All rights reserved

Analysis of Network data


Planning / Connections


Overview of load demand:
Improve connections process.


Overview of load profiles:
Identification of changes in load profiles with increase in LV
connected generation / heat pumps / electric vehicles.


Utilisation


mapping using colour pins


Load profiling


variation during the day

Secondary

substation

utilisation
:







2012. UK Power Networks. All rights reserved

Analysis of Network data


Planning / Connections

Secondary

substation

utilisation
:






Utilisation


variation with time
with side by side comparison
using bar charts


Utilisation


duration curve



2012. UK Power Networks. All rights reserved

Analysis of Network data


Planning / Connections


Load profiling


using colour pins on map



2012. UK Power Networks. All rights reserved

Analysis of Network data


Asset Management


Secondary Substation Ventilation:



Ambient air temperatures


colour pins on map


Overview of substation ventilation:
Identify sites which may be inadequately
ventilated or which reach extreme levels of cold.


Potential to prolong transformer asset life.



2012. UK Power Networks. All rights reserved

Primary Transformer Tap Changers:


Analysis of Network data


Asset Management


Number of Tap Changer Operations in one day for each LPN Primary Transformer (Average 40)


Tap change operating time:
Identify tap changer anomalies.


Tap change count:
Inform maintenance frequency of tap changers.





2012. UK Power Networks. All rights reserved

Analysis of Network data


Operations / Planning

Secondary Substation Voltage:


Voltage


Load relationship


High / Low Voltage investigations


colour pins on map


Voltage comparison against limits


Inform decisions in respect of voltage investigations.


Provide information in respect of effect of LV connected generation and voltage



2012. UK Power Networks. All rights reserved

Analysis of Network data


Planning

Secondary Substation 3
Φ

Voltage and Current Unbalance


Current Unbalance reports


Average and Maximum


Voltage Unbalance


Current Unbalance


Current unbalance


identification of worst case substations in respect of losses


consistent
unbalance


possible mitigation


cost / benefit



2012. UK Power Networks. All rights reserved



Analysis of Network data


Planning

Secondary Substation 3
Φ

Voltage Total Harmonic Distortion
(THD)

Utilisation


Relationship with load / network configuration.


Helps with RTU alarm settings with a view to obtaining individual harmonic data over
defined levels/periods



2012. UK Power Networks. All rights reserved

Generation Detection

Solar

radiation

Load on
secondary
transformer


Powersense monitoring trial:


Connected at 11kV at water supply
works with generation


Secondary transformer load profile:


Large PV (150kW) installation secondary
substation load
vs

solar radiation

PowerSense

Optical Sensor



2012. UK Power Networks. All rights reserved

Data Cleansing

Spike
Scale factor
change
Gap
Non
zero
gap
+/
-
spikes
Dropping out
Reduction/
-
ve
power
Data anomalies

Spikes

Missing data


Data quality affects analysis e.g. long term maximum/average/minimum figures.


Data cleansing algorithms developed to detect and remove anomalies where possible.



2012. UK Power Networks. All rights reserved


Half Hour averaging of power factor


variation between leading and lagging


half
hour average incorrect.


Current Transformer (CT) location on one of two parallel cables between secondary
transformer and LV board. RTU doubles reading


apparent unbalance if cables not
sharing current

Measurement observations

Current
Transformer

Voltage Fuse

Transformer
Dual LV
Cable/Tail



2012. UK Power Networks. All rights reserved


Further engagement

with business units;


Additional

development in respect of usability required;


Investigations

of additional RTU functionality in respect of alarms and event recording
continuing;


Integrated phase to start shortly,


interfaces with existing databases and applications
e.g

Asset Data, Geographical
Network Data.


additional functionality to be added to application.

Next Steps



2012. UK Power Networks. All rights reserved

Thank You


Any Questions?