A new type of flexible AC transmission system(FACTS)devices-distributed static synchronous series compensator(DSSC)
which enables to realize grid power flow control
is proposed. The DSSC is investigated from the view point of frequency domain and the impedance characteristics of the DSSC in sub-synchronous frequencies range are analyzed to provide the theoretical support for the sub-synchronous resonance(SSR)mechanism research. By means of test signal detection
the IEEE second benchmark model(system 1)is adopted and the system SSR damping characteristics are revealed. The results show that the resonant point of the combined system is shifted and the electric negative damping around the resonant point is reduced greatly.
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