Abstract
The interaction between the DFIG-based wind farm and series compensation can easily cause subsynchronous control interaction (SSCI). The oscillation frequency of SSCI varies with the actual wind farm situation, which is different from the fixed subsynchronous oscillation frequency of the thermal power unit. Due to the time-variant of the SSCI's oscillation frequency, this paper proposes a supplementary wide-band damping control strategy for MMC-STATCOM to mitigate SSCI. The method adopts a notch filter (NF) to filter only the fundamental frequency component in the current and obtains the corresponding subsynchronous component to generate the damping control signal. Additional damping control signal tracking subsynchronous component changes correct corresponding output voltage, making MMC-STATCOM present positive resistance in subsynchronous frequency. This strategy does not require phase compensation and can always extract the corresponding subsynchronous component compared with the existing research. Finally, both the impedance analysis and time-domain simulation have been involved in verifying the feasibility of the proposed suppression strategy for SSCI under various operating conditions.
Published Version
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