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 L f and C f are AC smoothing filter components 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 Hampton Amagansett Installation Site Double Circuit 69kV fault Areas of Voltage Collapse Concerns East End of Long Island Ref. American Superconductors

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

Northeast Utilities Danbury Area D-VAR solution by American Superconductors

SW Connecticut Imports Per Unit Voltages Problem Solution Northeast Utilities Danbury Area Comparison 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 115 kV 34.5 kV T1 60/90 MVA with 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 MVAR D-VAR Dynamic Capacitor Banks 2 x 18 MVAR = 36 MVAR D-VARs. Dynamic 2 x 8 x 3 = 48 MVAR 1200 Amp Breaker 4x2500 KVA V padmount transformers 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