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D-VAR or DSTATCOM
Distributed Static Compensator is a fast-compensating reactive power source used in the transmission or distribution systems primarily to reduce voltage variations such as sags, surges, and flicker, along with instability caused by rapidly varying reactive power demand . A D-STATCOM consists of a two-level Voltage Source Converter (VSC), a DC energy storage device and a coupling transformer connected in parallel to the distribution network. The VSC converts the dc voltage across the storage device into three-phase ac output voltage. These 3-phase ac voltages are in phase and coupled with the AC system through the reactance of the coupling transformer. D-VARs or DSTATCOMs are mobile and can be relocated easily. The devices use insulated gate bipolar transistors (IGBTs) that are air cooled, and operate at high efficiency which lowers harmonics .
D-VARs or DSTATCOMs can be placed at T&D interfaces to provide voltage support, reduce flicker generation, improve power quality, alleviate wind generator impact on transmission lines, etc. The DVARs have the capacity of peaking their output to 3 to 4 times the rated capacity before returning to their nominal rating, which is essential for managing flicker, voltage instabilities, and fault-induced delayed voltage recovery (FIDVR) 
 NETL, Compendium of Smart Grid Technologies. URL: http://www.netl.doe.gov/smartgrid/referenceshelf/whitepapers/Compendium_of_Technologies_APPROVED_2009_08_18.pdf
Key Technology Area:
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