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Dynamic VAR’s [D-VAR]

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.

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Dynamic VAR’s [D-VAR]

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  1. 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

  2. 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

  3. 1A 2A + Lf Cf DC AC 1B 2B - 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 Ref. American Superconductors

  4. D-VAR Unit 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

  5. East End of Long Island Southold Orient Point Generating Peconic Areas of Voltage Collapse Concerns Mattituck Tuthill Riverhead Bridgehampton Amagansett Hero East Hampton Buell Southampton Tiana Double Circuit 69kV fault Installation Site Ref. American Superconductors

  6. Proposed Solution for the East End Voltage Issues 8 MVA D-VAR Installed at Bridgehampton 8 MVA D-VAR Easthampton 69 kV To Bridgehampton To Buell 13.8 kV Load Load To East Hampton Diesels 13.8 kV VT Inputs to DVAR for Voltage Control 480-13800 V Padmount Transformers VT Ref. American Superconductors

  7. Northeast Utilities Danbury AreaD-VAR solution by American Superconductors

  8. Northeast Utilities Danbury AreaComparison of Load-flow Results Solution Per Unit Voltages Problem SW Connecticut Imports Ref. American Superconductors

  9. D-VAR™ Solution’s Dynamic Voltage Support Provides a total of -48 MVAR/+84 MVAR T1 60/90 MVA with LTC Utility Interconnection Point 34.5 kV 115 kV 600V 26 MW 9 X 3.6 MVAR VTs 97% Lagging PF 26 units The dynamic MVARs are sized to prevent the wind farm from tripping off-line for the faults that the utility specified. 34.5 kV UDG collector system 600V Joslyn VBM Switch 28 MW 97% Lagging PF 8/24 MVAR D-VAR 28 units 4x2500 KVA 34500-480V padmount transformers D-VARs . Dynamic 2 x 8 x 3 = 48 MVAR 8/24 MVAR D-VAR 1200 Amp Breaker 600V 26 MW Dynamic Capacitor Banks 2 x 18 MVAR = 36 MVAR Joslyn VBU Switch 97% Lagging PF 26 units Caprock Wind Farm, New Mexico; D-VAR built by American Superconductors

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