In view of the sub-synchronous oscillation（SSO） problem between the doubly-fed induction generator（DFIG）-based wind farm and the series-compensated transmission system with combination of interactive feature due to oscillation

a kind of SSO wide-band suppression method strategy based on energy complementation combined with the interactive characteristics of oscillation is proposed and achieved by the static var generator.The power compensation characteristic design of the static var generator is used to design the damping modulation strategy of extracting the wide-band sub-synchronous signal so to suit the suppression of SSO with time-varying frequency.It is shown by the time domain simulation result that the designed suppression strategy can generate the corresponding inverting sub-synchronous power according to the sub-synchronous signal in the line to offset the sub-synchronous energy

thereby blocking the interaction between the DFIG-based wind farm and the series-compensated line and suppressing the SSO effectively.