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7/30/2019 0002 Woodley
1/13
IEEE Power Engineering SocietyIEEE Power Engineering Society
Winter Meeting 2000 - SingaporeWinter Meeting 2000 - Singapore
Field Experience WithField Experience With
Dynamic Voltage RestorerDynamic Voltage Restorer(DVR MV) Systems(DVR MV) Systems
Neil H. Woodley, PE, Sr. Member, IEEE
Siemens Power T&D
7/30/2019 0002 Woodley
2/13
IEEE Power Engineering SocietyIEEE Power Engineering Society
Winter Meeting 2000 - SingaporeWinter Meeting 2000 - Singapore
Dynamic Voltage Restorer (DVR MV)Dynamic Voltage Restorer (DVR MV)
TransmissionSystem Switching
or Fault Clearing
Fault occuring on
adjacent feed
Primary FeedersDistribution
Substation
DYNAMIC
VOLTAGE
RESTORER
RestoredVoltage
PU
+1
0
-1
=+
PU
+1
0
-1
Line VoltageWith Sag
CompensatingVoltage
PU
+1
0
-1
Protected
Sensitive Load
7/30/2019 0002 Woodley
3/13
IEEE Power Engineering SocietyIEEE Power Engineering Society
Winter Meeting 2000 - SingaporeWinter Meeting 2000 - Singapore
Dynamic Voltage Restorer (DVR MV)Dynamic Voltage Restorer (DVR MV)
Interconnection
Equipment
n Bypass switch protects
DVR MV
n Shorting switch protects power
electronics
n Isolation breakers remove
DVR MV from system
n Auxiliary power from load side
CustomerSensitive Load
Manual Shorting &Disconnect Switches
DC Link
Capacitor
AC Filter
DVRDC to ACInverter(2 MVA)
DC to DCConverter
Solid
State
BypassBreaker
IsolationBreakers
Series InjectionTransformers
3 CT's
0.3% Accuracy
To DVR5A, 3-phase
Westinghouse
DVR
Interconnect
Equipment
Utility DistributionFeeder
3 MOVArresters
3 MOVArresters
Bypass
3 Distribution Transformers
Total 30 kVA (or other reliablestation supply)
To DVR Auxiliary Power208/120V AC Three Phase
7/30/2019 0002 Woodley
4/13
IEEE Power Engineering SocietyIEEE Power Engineering Society
Winter Meeting 2000 - SingaporeWinter Meeting 2000 - Singapore
Dynamic Voltage Restorer (DVR MV)Dynamic Voltage Restorer (DVR MV)
Multi-Module DVR MV
Large System
n 2MVA inverter rating per module
n single series injection transformercouples combined inverter to output
n single set of interconnection switchgear
n each module has own SCR crowbar
shorting switch for protection
n tie reactors provide impedance for
sharing output current
n master/slaves communications via fiber
optical links
Common Low Voltage BUS
Remotely Operated Mechanical Bypass
Master Slave Slave
TieReactor
FastElectronicBypass
OutputFilter
VoltageRegulator
Source Load
VT VT
Optical Fibers
InverterEnergyStorageInterface
CurrentRegulator
Optical
Interface
InverterEnergyStorageInterface
EnergyStorageInterface
Inverter
CurrentRegulator
Optical
Interface
CurrentRegulator
Optical
Interface
To Other
Slaves
Isolation Switch
InjectionTransformer
Isolation Switch
7/30/2019 0002 Woodley
5/13
IEEE Power Engineering SocietyIEEE Power Engineering Society
Winter Meeting 2000 - SingaporeWinter Meeting 2000 - Singapore
Dynamic Voltage Restorer (DVR MV)Dynamic Voltage Restorer (DVR MV)
Caledonian Paper plc
Irvine, Scotland
n 325 t/yr coated paper
n 47MVA total plant load
n 11kV (50 Hz) plant system fed from
Scottish Power 132kV transmission
n deepest sag 0.34 pu retained volts
n 37 sags per year
n plant hardened to 0.74 pu
UPM
7/30/2019 0002 Woodley
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IEEE Power Engineering SocietyIEEE Power Engineering Society
Winter Meeting 2000 - SingaporeWinter Meeting 2000 - Singapore
Dynamic Voltage Restorer (DVR MV)Dynamic Voltage Restorer (DVR MV)
Caledonian Paper plc
DVR MV Installation
n 4 MVA, .8MJ DVR; 40% injection;200 msec (10 cycles)
n 11 kv cable-connected
n 2 - 2MVA power electronic modules
n2 - 0.4MJ capacitor energystorage modules
n Underground pad-mounted DVR MVinterconnection equipmentUPM
7/30/2019 0002 Woodley
7/13
IEEE Power Engineering SocietyIEEE Power Engineering Society
Winter Meeting 2000 - SingaporeWinter Meeting 2000 - Singapore
Dynamic Voltage Restorer (DVR MV)Dynamic Voltage Restorer (DVR MV)
n Protects state-of-the-art microprocessor
fabrication plant
n 69/12.5kV substation fed by three69kV overhead lines
n 12.5kVL-L (7.2kVL-G) dedicated feeds
n 3x2MVA power electronic modules
per DVR system (master + 2 slave)
n 1.8MJ capacitor energy storageper system
n Inserted voltage: 23, 26, 30, 35%
on 26, 23, 20, or 17 MVA taps
Twin Multi-Module DVR MV Systems
North DVR System
7/30/2019 0002 Woodley
8/13
7/30/2019 0002 Woodley
9/13
IEEE Power Engineering SocietyIEEE Power Engineering Society
Winter Meeting 2000 - SingaporeWinter Meeting 2000 - Singapore
Prototype Installation
n Demonstration project on BC Hydro
system at Dawson Creek, BC
n Protects Northern Lights CommunityCollege sensitive load (computers, etc.)
n Ambient temperature range extended
to -40C site conditions
n In service February, 1999. (Photo
shows installation in progress.)
Platform-Mounted DVR (DVR PM)Platform-Mounted DVR (DVR PM)
7/30/2019 0002 Woodley
10/13
IEEE Power Engineering SocietyIEEE Power Engineering Society
Winter Meeting 2000 - SingaporeWinter Meeting 2000 - Singapore
Prototype System
n Compact power electronics moduleincludes control and injected voltagewaveform synthesis
n Three independent single-phase
injection capability
n Hybrid solid-state & mechanical bypasssystem for overcurrent protection
Power ElectronicsModule
Source SideCTs
Line EnergySupply
Transformer
3 S i n g l e -
phase InjectionTransformers
High voltageElectro-
mechanicalBypass switch
CT ShortingSwitch Module
Platform-Mounted DVR (DVR PM)Platform-Mounted DVR (DVR PM)
7/30/2019 0002 Woodley
11/13
IEEE Power Engineering SocietyIEEE Power Engineering Society
Winter Meeting 2000 - SingaporeWinter Meeting 2000 - Singapore
Distribution SystemInterconnection
n Uses proven DVR technology
n Compact mechanical design
to apply on overhead systems
n Ratings suited to individual
commercial & small industrialcritical customer loads
n Low maintenance, high reliability
Source LoadInjection Transformer
Line EnergySupply
Transformer
Power Electronics Module
Lineman's
Switch
In
Service
Out of
Service
Power
ON
Line CT
CT
Shorting
Switch
Module
local operator interface
telephone line
power & signals to optional
monitoring package
ManualDisconnect
Switch
ManualDisconnect
Switch
InputPT
OutputPT
Electro-Mechanical Bypass
Platform-Mounted DVR (DVR PM)Platform-Mounted DVR (DVR PM)
7/30/2019 0002 Woodley
12/13
IEEE Power Engineering SocietyIEEE Power Engineering Society
Winter Meeting 2000 - SingaporeWinter Meeting 2000 - Singapore
-1.25
-1.00
-0.75
-0.50
-0.25
0.00
0.25
0.50
0.75
1.00
1.25
Load Voltage, Phase A
Time
V
ol
ts
(pu)
-1.25
-1.00
-0.75
-0.50
-0.25
0.00
0.25
0.50
0.75
1.00
1.25
Time
Injected Voltage, Phase A
Vo
lt
s
(pu)
Time
-1.25
-1.00
-0.75
-0.50
-0.25
0.00
0.25
0.50
0.75
1.00
1.25
Source Voltage, Phase A
V
olt
s
(pu)
Trigger #1Data Set
Trigger #2Data Set
Trigger #3Data Set
45% Sag, 0.96 sec
First Save by DVR PM
n Actual results from prototype PMDVR
field demonstration project
n Cause: Lightning arrester failure on
adjacent distribution feeder at 0230 hrs
on Wednesday, March 3, 1999
n Substation feeder breaker on affected
feeder cleared the fault
n Two phases sag; third swells (7%)
n Event duration: 0.96 sec
n Critical downstream load unaffected
Phase A
DVR PM - Field DemonstrationDVR PM - Field Demonstration
7/30/2019 0002 Woodley
13/13
IEEE Power Engineering SocietyIEEE Power Engineering Society
Winter Meeting 2000 - SingaporeWinter Meeting 2000 - Singapore
First Save by DVR PMFirst Save by DVR PM
Phase B Phase C
-1.25
-1.00
-0.75
-0.50
-0.25
0.00
0.25
0.50
0.75
1.00
1.25
Load Voltage, Phase B
Time
Volts
(pu)
-1.25
-1.00
-0.75
-0.50
-0.25
0.00
0.25
0.50
0.75
1.00
1.25
Time
Injected Voltage, Phase B
Volts
(pu)
-1.25
-1.00
-0.75
-0.50
-0.25
0.00
0.25
0.50
0.75
1.00
1.25
Source Voltage, Phase B
Time
Vol
ts
(pu)
7 % Swell, 0.96 sec
-1.25
-1.00
-0.75
-0.50
-0.25
0.00
0.25
0.50
0.75
1.00
1.25
Load Voltage, Phase C
Time
Vo
lt
s
(pu)
-1.25
-1.00
-0.75
-0.50
-0.25
0.00
0.25
0.50
0.75
1.00
1.25
Time
Injected Voltage, Phase C
Vo
lt
s
(pu)
-1.25
-1.00
-0.75
-0.50
-0.25
0.00
0.25
0.50
0.75
1.00
1.25
Source Voltage, Phase C
Time
V
ol
ts
(pu)
45 % Sag,.61 sec
DVR PM - Field DemonstrationDVR PM - Field Demonstration