an evaluation of collection network designs which eliminate the turbine converter
DESCRIPTION
An evaluation of collection network designs which eliminate the turbine converter. Max Parker Olimpo Anaya-Lara. Overview of connection methods. Star. String. Cluster. Example Wind Farm Layout. 1.2km. 1GW transmission platform rating. ±300kV HVDC link. - PowerPoint PPT PresentationTRANSCRIPT
An evaluation of collection network designs which eliminate the turbine converter
Max Parker
Olimpo Anaya-Lara
Overview of connection methods
StringStar
Cluster
Example Wind Farm Layout
• 1GW transmission
platform rating.
• ±300kV HVDC link.
• Turbines: 10MW, Swept
diameter 170m.
• Spacing: 7 diameters,
1190m.
• 10x10 square. 1.2km
1.2km
10.8km
10.8km
Windfarm Layout, Radial StringsFor string and cluster networks
CollectionPlatform
Turbines
RedundancyLinks
Cable voltage: 52kV AC 70kV DC
7 turbines per string
14 strings
Non-tapered cable rating
Windfarm Layout, Star Connection
1 Platform
4 Platforms
2 Platforms
8 Platforms
HVDC Link
Loop network
Platforms Outside Platforms InsideCollection
Collection/Transmission
Collection voltage: 11kV AC 15kV DC
Loop network voltage: 132kV AC ±100kV DC
Evaluation of cable lengths
0 1 2 3 4 5 6 7 8 9 100
100
200
300
400
500
600
700
Star, Stations Inside Star, Stations OutsideString and Cluster
Number of Converter Stations
Cabl
e Le
ngth
(km
)
0 1 2 3 4 5 6 7 8 9 10150
170
190
210
230
250
270
290
310
330
AC, Inside AC, OutsideDC, Inside DC, Outside
Number of Converter Stations
Capi
tal C
ost (
£M)
Evaluation of cable lengths breakdown of costs
1 2 4 8 100
50
100
150
200
250
300
Lifetime Losses
Collection Cable
Interconnect Cable
Platforms
Installation
Number of Converter Stations
Cost
(£M
)
Example: AC, platforms inside farm Loss Cost Calculation
Lifetime: 20 years
Discount rate: 10%
Electricity: £36/MWh
ROC: £40/MWh
0 10 20 300
5
10x 10
6 Mechanical Power
Pow
er (
W)
0 10 20 300
0.01
0.02
0.03
0.04Wind Probability
wind speed (m/s)0 10 20 30
0
0.5
1Turbine Speed
wind speed (m/s)
Spe
ed (
rads
/s)
Evaluation of losses
• Average wind speed: 9.8m/s
• Cut-in wind speed: 3m/s
• Cut-out wind speed: 25m/s
• Rated wind speed: 12m/s
Site and Turbine Parameters
Breakdown of losses
DC Star AC Star DC String AC String DC Cluster
AC Cluster0
50
100
150
200
250
300
350
400
TransformersPower ElectronicsCablesGeneratorClustering Loss
Annu
al L
oss (
GWh)
Breakdown of costs
DC Star AC Star DC String AC String DC Cluster
AC Cluster
0
100
200
300
400
500
600
PlatformCable InstallationCableLossCo
st (£
M)
Only cable, platform and loss costs considered at this stage
