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TCSC (Thyristor-Controlled Series Compensator)
has been used in modern power systems to increase power transfer and system stability.
Besides, due to its controllable feature, TCSC has been used to work as a solution
to sub-synchronous resonance (SSR) problems. However, it is not clear so far whether
TCSC’s inherent characteristic can avoid SSR and its effectiveness for SSR damping.
In this paper, an equivalent circuit of TCSC is used to better understand how TCSC
performs at sub-synchronous frequency ranges. Therefore, interactions of TCSC behaviors
and SSR components can be viewed individually. The effects of TCSC operation interfered
by sub-synchronous components are discussed. Results show that TCSC has the capability
to damp SSR, but this capability can be deteriorated if TCSC firing logic cannot
be effectively maintained.