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Static synchronous series compensator

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Static synchronous series compensator

A static synchronous series compensator (SSSC) is a type of flexible AC transmission system which consists of a solid-state voltage source inverter coupled with a transformer that is connected in series with a transmission line. This device can inject an almost sinusoidal voltage in series with the line. This injected voltage could be considered as an inductive or capacitive reactance, which is connected in series with the transmission line.[1] This feature can provide controllable voltage compensation.[2] In addition, SSSC is able to reverse the power flow by injecting a sufficiently large series reactive compensating voltage.[2]

SSSCs are part of the family of series controllers within FACTS devices. Two variants are possible:

  • The conventional SSSC, connected to the transmission line through a transformer
  • The transformerless SSSC, connected to the transmission line through multilevel inverters (such as modular transformerless SSSCs).[3]


The use of SSSCs provides the typical advantages of load flow control that can also be realised by other technologies such as PST, TCSC and partly by a series reactor. However, both conventional and transformerless SSSCs also offer additional special functions such as:

  • Better controllability of power flow, as SSSCs possess the inherent capability to decrease as well as to increase (real) power flow almost linearly in the circuit.
  • Receiving end voltage regulation of a radial line: In short circuit weak networks by controlling the degree of series compensation to keep the end-voltage constant in the face of changing load and load power factor.
  • Power oscillation damping: the SSSC is a controlled device and can be used to damp wide area low frequency power oscillations.
  • Regional network voltage regulation by the inherent networking of devices applied at different locations in a grid.
  • Phase balancing: Modular SSSC as a single phase device can independently alter the effective phase impedance of a circuit[s] to rebalance power flows.

In addition to these range of applications, the modular SSSC are designed to be easily relocated if needed. Moreover, the amount of load flow shift can be adjusted by adding or removing modules, depending on the network needs. A little effort redeployability for is expected.[3]

See also

References

  1. ^ "SSSC-static synchronous series compensator: theory, modeling, and application" (PDF). IEEE Journals & Magazine. Retrieved 2017-12-15.
  2. ^ a b "Static Synchronous Series Compensator: A Solid-State Approach to the Series Compensation of Transmission Lines" (PDF). IEEE Journals & Magazine. 2017-11-07. Retrieved 2017-12-15.
  3. ^ a b "Static Synchronous Series Compensator - ENTSO-E". www.entsoe.eu. Retrieved 2023-06-28.
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