voltage demonstration steven gough innovation and low carbon network engineer...
TRANSCRIPT
Voltage Demonstration
Steven GoughInnovation and Low Carbon Network [email protected] 933 217007810 054850
Introduction
• 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 D-SVC– 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
D-SVC
G
Summerheath
Roskrow WF
Kernick Industrial Estate
Bickland Hill Primary
Phase 1 Output Graphs (1)
Real and Reactive Power at Windfarm
-200
0
200
400
600
800
1000
1200
1400
1600
1800
00:00 02:00 04:00 06:00 08:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 00:00
Time
Po
we
r
Average kW
Max kW
Min kW
Average kVar
Max kVar
Min kVar
Real and Reactive Power at SVC
-500
-400
-300
-200
-100
0
100
200
300
400
500
00:00 02:00 04:00 06:00 08:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 00:00
Time
Po
we
r
Average kW
Max kW
Min kW
Average kVar
Max kVar
Min kVar
Voltage at D-SVC
225
230
235
240
245
250
00:00 02:00 04:00 06:00 08:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 00:00
TimeP
ha
se to
Lin
e V
otla
ge
Va
Va(max)
Va(min)
Vb
Vb(max)
Vb(min)
Vc
Vc(max)
Vc(min)
Phase 1 Output Graphs (2)
Voltage at D-SVC
225
230
235
240
245
250
00:00 02:00 04:00 06:00 08:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 00:00
Time
Ph
ase
to L
ine
Vo
tlag
e
Va
Va(max)
Va(min)
Vb
Vb(max)
Vb(min)
Vc
Vc(max)
Vc(min)
Voltage at Windfarm
6000
6050
6100
6150
6200
6250
6300
6350
6400
6450
00:00 02:00 04:00 06:00 08:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 00:00
TimeP
ha
se to
Lin
e V
otla
ge
Va
Va(max)
Va(min)
Vb
Vb(max)
Vb(min)
Vc
Vc(max)
Vc(min)
Voltage at Bickland Hill Primary
5950
6000
6050
6100
6150
6200
6250
6300
6350
6400
6450
00:00 02:00 04:00 06:00 08:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 00:00
Time
Ph
ase
to L
ine
Vo
tlag
e
Va
Va(max)
Va(min)
Vb
Vb(max)
Vb(min)
Vc
Vc(max)
Vc(min)
Phase 1 Output Graphs (3)
Voltage at Windfarm with D-SVC Switched In
6050
6100
6150
6200
6250
6300
6350
6400
6450
6500
6550
00:00 02:00 04:00 06:00 08:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 00:00
TimeP
ha
se to
Lin
e V
otla
ge
Va
Va(max)
Va(min)
Vb
Vb(max)
Vb(min)
Vc
Vc(max)
Vc(min)
Voltage at Windfarm with D-SVC Switched Out
6050
6100
6150
6200
6250
6300
6350
6400
6450
6500
6550
00:00 02:00 04:00 06:00 08:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 00:00
Time
Ph
ase
to E
art
h V
otla
ge
Va
Va(max)
Va(min)
Vb
Vb(max)
Vb(min)
Vc
Vc(max)
Vc(min)
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
D-SVC
D-SVC
G
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
