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Static Synchronous Series Compensator (SSSC)

The Static Synchronous Series Compensator (SSSC) is a device that belongs to the Flexible AC Transmission Systems (FACTS) family using power electronics to control power flow and improve power oscillation damping on power grids. The SSSC injects a voltage in series with the transmission line where it is connected. The SSSC contains a solid-state voltage source inverter connected in series with the transmission line through an insertion transformer. This connection enables the SSSC to control power flow in the line for a wide range of system conditions.


Static synchronous series compensator (SSSC) uses a voltage source converter to inject a controllable voltage in quadrature with the line current of a power network. Such a device is able to rapidly provide both capacitive and inductive impedance compensation independent of the power line current. Moreover, an SSSC with a suitably designed external damping controller can also be used to improve the damping of the low-frequency power oscillations in a power network.


[1] N. G. Hingorani, L. Gyugyi, "Understanding FACTS; Concepts and Technology of Flexible AC Transmission Systems," IEEE Press book, 2000
[2] 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: 
Advanced Components

Sample Vendors:

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