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AN ADAPTIVE WIDEBAND OSCILLATION SUPPRESSION METHOD FOR WIND FARM INTEGRATION THROUGH MMC-HVDC SYSTEM

With the rapid development of modular multilevel converter-based high-voltage DC (MMC-HVDC) transmission system for wind farm integration, the wideband oscillation issues have become increasingly serious. By far, most of the oscillation suppression methods are merely suitable for oscillation suppression in a specific frequency range, e.g., sub-/super-synchronous oscillation and high-frequency oscillation. In this paper, an adaptive wideband oscillation suppression method for wind farm integration through MMC-HVDC system is proposed in order to mitigate various oscillations adaptively. The wideband impedance models of the wind farm and MMC are derived analytically, which are validated by frequency scanning in simulation. Then, the effect of the proposed oscillation suppression method is theoretically analysed based on the impedance-frequency characteristics. The time-domain simulation model of wind farm integration through MMC-HVDC system is built in MATLAB/Simulink. Two oscillatory cases, i.e., sub-/super-synchronous oscillation and high-frequency oscillation, are carried out to validate the effectiveness of the proposed adaptive wideband oscillation suppression method. It is worth noting that the proposed oscillation suppression method can be applied in both controllers of wind turbine converters and wind farm side MMC.