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Voltage Demonstration
Steven Gough
Innovation and Low Carbon Network Engineer
[email protected]
0117 933 2170
07810 054850
Introduction
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•
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Background
Aims
Progress in Phase 1
Phase 1 output graphs
Plans for Phase 2
Learning so far
Background
• D-SVC - Static VAr Compensator
for Distribution Networks
• Supplied by Hitachi
• Can produce 400kVAr leading or
lagging
• 11kV connected via a dedicated
11kV/415V transformer
• Designed for use on long rural
feeders that have Distributed
Generation (DG) for voltage
control
Aims
• Stabilise voltage for a
windfarm at the end of a
11kV feeder
• Establish the impact of the
D-SVC on the 11kV network
• Test the three different
modes available on the DSVC
– Voltage Regulation
– Voltage Averaging
– Short Term Fluctuations
Progress in Phase 1
• D-SVC is installed on site
adjacent to a 1.5MW windfarm
in Cornwall
• Protection was installed on the
LV side of the transformer as
there was not a metering unit
• Monitoring equipment was
installed along the feeder
• D-SVC has been running on
various modes for nearly 4
months
Roskrow WF
G
Kernick Industrial
Estate
Summerheath
D-SVC
Bickland Hill Primary
Voltage
at D-SVC
Real and Reactive
Power
at Windfarm
1800250
Phase 1
Output
Graphs (1)
1600
1400245
1200
Phase to Line Votlage
Va
Va(max)
Average
kW
Va(min)
Max kW
Vb
Min kW
Vb(max)
Vb(min)
Average
kVar
Vc
Max kVar
Vc(max)
Min kVar
Vc(min)
Power
240
1000
800
235
600
400
230
200
0
225
-200 00:00
00:00
Real and Reactive Power at SVC
02:00
04:00
06:00
08:00
10:00
12:00
14:00
16:00
18:00
20:00
22:00
00:00
02:00
04:00
06:00
08:00
10:00
12:00Time 14:00
16:00
18:00
20:00
22:00
00:00
Time
500
400
300
200
Average kW
Max kW
Min kW
Average kVar
Max kVar
Min kVar
Power
100
0
-100
-200
-300
-400
-500
00:00
02:00
04:00
06:00
08:00
10:00
12:00
Time
14:00
16:00
18:00
20:00
22:00
00:00
Voltage at Windfarm
6450
Phase 1
Output
Graphs (2)
6400
6350
Phase to Line Votlage
6300
Va
Va(max)
Va(min)
Vb
Vb(max)
Vb(min)
Vc
Vc(max)
Vc(min)
6250
6200
6150
6100
6050
6000
00:00
02:00
04:00
06:00
08:00
10:00
at D-SVC
Voltage Voltage
at Bickland
Hill Primary
Time
250
6450
6400
245
6350
PhasetotoLine
LineVotlage
Votlage
Phase
6300
VaVa
Va(max)
Va(max)
240
6250
Va(min)
Va(min)
VbVb
Vb(max)
Vb(max)
6200
Vb(min)
Vb(min)
VcVc
235
6150
Vc(max)
Vc(max)
Vc(min)
Vc(min)
6100
230
6050
6000
5950
225
00:00
00:00
02:00
02:00
04:00
04:00
06:00
06:00
08:00
10:00
12:00
12:00
Time
Time
14:00
14:00
16:00
16:00
12:00
18:00
18:00
20:00
20:00
22:00
22:00
00:00
00:00
14:00
16:00
18:00
20:00
22:00
00:00
Voltage at Windfarm with D-SVC Switched In
6550
Phase 1
Output
Graphs (3)
6500
6450
Phase to Line Votlage
6400
Va
Va(max)
Va(min)
Vb
Vb(max)
Vb(min)
Vc
Vc(max)
Vc(min)
6350
6300
6250
6200
6150
6100
6050
00:00
02:00
04:00
06:00
08:00
10:00
Time
Voltage at Windfarm with D-SVC Switched Out
6550
6500
6450
Phase to Earth Votlage
6400
Va
Va(max)
Va(min)
Vb
Vb(max)
Vb(min)
Vc
Vc(max)
Vc(min)
6350
6300
6250
6200
6150
6100
6050
00:00
02:00
04:00
06:00
08:00
10:00
12:00
Time
14:00
16:00
18:00
12:00
20:00
22:00
00:00
14:00
16:00
18:00
20:00
22:00
00:00
Plans for Phase 2
• Three D-SVCs will be used across two adjacent primary
substations
• A D-VQC (Voltage and Reactive Power (Q) Control System) will
be used at the primary to control all three D-SVCs and the tap
changer at one of the primary substations
• Although the site has not been confirmed, there is a
combinations of medium wind generation, very long rural
feeders and a large number of domestic properties with PV
D-SVC
G
D-SVC
D-SVC
Learning so far
• When setting up a protection of the D-SVC the protection
needs to be on the HV side of the transformer
• When sizing the transformer for a D-SVC it is important
select well above the power requirement of the device
• The D-SVC can help smooth the voltage
• The D-SVC can help reduce the range of voltages see on the
11kV
Any Questions?
Steven Gough
Innovation and Low Carbon Network Engineer
[email protected]
0117 933 2170
07810 054850