dynamic var’s [d-var]
DESCRIPTION
Dynamic VAR’s [D-VAR]. What are D-VAR Devices? D ynamic VAR s… 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. - PowerPoint PPT PresentationTRANSCRIPT
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
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
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
ACDC
+
-
Ref. American Superconductors
Each D-VAR system has continuous reactive power… with temporary overload capability up to 3 times its continuous rating. Each phase is individually controlled.
Proprietary Power Electronics Technology
Ref. American Superconductors
D-VAR Unit
Southold
Tiana
Southampton
Bridgehampton
Riverhead
Buell
Generating
Hero
Orient Point
Tuthill
Mattituck
Peconic
East HamptonAmagansett
Installation SiteDouble Circuit 69kV fault
Areas of Voltage Collapse Concerns
East End of Long Island
Ref. American Superconductors
To East Hampton Diesels
8 MVAD-VAR Inputs to DVAR
for Voltage Control
VT
480-13800 VPadmount
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
Stony Hill
Plumtree
RockyRiver
WestBrookfield
BatesRock
Shepaug
CarmelHill
LongMountain
FrostBridge
G
G
G
345 kV115 kVHydro GeneratorSubstation
Trans. CapacitorDistrib. Capacitor
D-VAR TM
Northeast Utilities Danbury AreaD-VAR solution by American Superconductors
SW Connecticut Imports
Pe
r U
nit V
olta
ge
s
Problem
Solution
Northeast Utilities Danbury AreaComparison of Load-flow Results
Ref. American Superconductors
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
T160/90 MVAwith LTC
28 units
26 units
97% Lagging PF
97% Lagging PF
26 MW
600V
26 units
34.5 kV UDGcollectorsystem
97% Lagging PF
UtilityInterconnection
Point
8/24 MVARD-VAR
VTs
8/24 MVARD-VAR
Dynamic Capacitor Banks 2 x 18 MVAR = 36 MVAR
D-VARs . Dynamic 2 x 8 x 3 = 48 MVAR
1200 AmpBreaker
4x2500 KVA 34500-480Vpadmount
transformers
JoslynVBM
Switch
JoslynVBU
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