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Dynamic VAR’s [D-VAR] 

What are D-VAR Devices?

• Dynamic VARs… Fully integrated modular STATCOM

with proprietary 3X overload

• Instantaneously injects precise amounts of reactive

power into a network

• Can be seamlessly integrated with static shunt devices

as part of a larger solution

Ref. American Superconductors

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Transmission Problems That D-VAR Can Solve: 

•Voltage Stability / Voltage Collapse -

•Uncontrolled rapid decline in system voltage

• Steady State Voltage Regulation -• Wind farms, radial lines, etc...

• Import/ Transfer Capability Restrictions -

• Limited ability to reliably import, export, or transfer power 

• Mitigate voltage flicker/ power quality -

• Wind farms, industrial facilities

Ref. American Superconductors

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Single Phase DC/AC Inverter  

• Devices 1A, 1B, 2A and 2B are IGBT’s

acting as fast switches

• Capacitors hold DC charge• Lf and Cf are AC smoothing filter 

components

Lf  

Cf  

1A 

1B 

2A 

2B 

 AC DC 

+ 

- 

Ref. American Superconductors

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Each D-VAR system hascontinuous reactive power…

with temporary over load 

capabi l i ty up to 3 t imes i ts 

cont inuous rat ing . Each

 phase is individually controlled.

Proprietary Power ElectronicsTechnology 

Ref.

 American Superconductors

D-VAR Unit 

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Southold 

Tiana 

Southampton 

Bridgehampton 

Riverhead 

Buell 

Generating 

Hero 

Orient Point 

Tuthill 

Mattituck  

Peconic 

East Hampton Amagansett 

Installation Site Double Circuit 69kV fault 

Areas of Voltage Collapse Concerns 

East End of Long Island

Ref. American Superconductors

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To East Hampton Diesels

8 MVA

D-VAR Inputs to DVAR

for Voltage Control

VT

480-13800 V

Padmount

Transformers

69 kV

13.8 kVLoad

Load

VT

13.8 kV

To BuellTo Bridgehampton

Easthampton

Proposed Solution for the East End Voltage Issues

8 MVA D-VAR Installed at Bridgehampton

Ref. American Superconductors

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Stony Hill

Plumtree

Rocky

River 

West

BrookfieldBates

Rock

Shepaug

Carmel

Hill

Long

Mountain

Frost

Bridge

G

G

G

345 kV

115 kV

Hydro Generator 

Substation

Trans. Capacitor 

Distrib. Capacitor 

D-VAR TM

Northeast Utilities Danbury Area

D-VAR solution by American Superconductors

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SW Connecticut Imports

   P  e  r   U  n   i   t   V  o   l   t  a  g

  e  s

Problem

Solution

Northeast Utilities Danbury Area

Comparison of Load-flow Results

Ref. American Superconductors

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D-VAR™ Solution’s Dynamic Voltage Support

Provides a total of -48 MVAR/+84 MVAR

28 MW

26 MW

600V

600V 115 kV34.5 kV

T1

60/90 MVAwith LTC

28 units

26 units

97%

Lagging PF

97%

Lagging PF

26 MW

600V

26 units

34.5 kV UDG

collector 

system

97%

Lagging PF

Utility

Interconnection

Point

8/24 MVAR

D-VAR

VTs

8/24 MVARD-VAR

Dynamic Capaci tor Banks 

2 x 18 MVAR = 36 MVAR 

D-VARs  . 

Dynamic 2 x 8 x 3 = 48 MVAR 

1200 Amp

Breaker 

4x2500 KVA

34500-480V

padmounttransformers

Joslyn

VBM

Switch

Joslyn

VBU

Switch

The dynamic MVARs are sized to

prevent the wind farm from

tripping off-line for the faults that

the utility specified.

9 X 3.6 MVAR

Caprock Wind Farm, New Mexico; D-VAR built by American Superconductors