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    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

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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)

    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

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    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

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    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

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    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

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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

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    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

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    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)

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    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)

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    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)

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    -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

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    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