Dynamic VARs DVAR What are DVAR Devices Dynamic

Dynamic VAR’s [D-VAR] What are D-VAR Devices? • Dynamic VARs… Fully integrated modular STATCOM with proprietary 3 X 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 + 1 A 2 A Lf Cf DC 1 B - AC 2 B • Devices 1 A, 1 B, 2 A and 2 B are IGBT’s acting as fast switches • Capacitors hold DC charge • Lf and Cf are AC smoothing filter components Ref. American Superconductors

D-VAR Unit Proprietary Power Electronics Technology Each D-VAR system has continuous reactive power… with temporary overload capability up to 3 times its continuous rating. Each phase is individually controlled. Ref. American Superconductors

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

Proposed Solution for the East End Voltage Issues 8 MVA D-VAR Installed at Bridgehampton Easthampton 69 k. V To Bridgehampton Load To Buell 13. 8 k. V Load To East Hampton Diesels 13. 8 k. V 8 MVA D-VAR VT 480 -13800 V Padmount Transformers VT Inputs to DVAR for Voltage Control Ref. American Superconductors

Northeast Utilities Danbury Area D-VAR solution by American Superconductors

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

D-VAR™ Solution’s Dynamic Voltage Support Provides a total of -48 MVAR/+84 MVAR 600 V 26 MW 97% Lagging PF 34. 5 k. V T 1 60/90 MVA with LTC 9 X 3. 6 MVAR 26 units 115 k. V VTs Utility Interconnection Point The dynamic MVARs are sized to prevent the wind farm from tripping off-line for the faults that the utility specified. 34. 5 k. V UDG collector system 600 V Joslyn VBM Switch 28 MW 97% Lagging PF 28 units 4 x 2500 KVA 34500 -480 V padmount transformers 600 V 26 MW 97% Lagging PF 26 units 8/24 MVAR D-VARs. Dynamic 2 x 8 x 3 = 48 MVAR 8/24 MVAR D-VAR 1200 Amp Breaker Joslyn VBU Switch Dynamic Capacitor Banks 2 x 18 MVAR = 36 MVAR Caprock Wind Farm, New Mexico; D-VAR built by American Superconductors