Abstract
Resonances or instability phenomena may occur in wind farms integration through a flexible HVDC transmission system. The relationship between the resonance risk and wind turbines number under different lengths of the line from wind farms to the flexible HVDC converter station is studied in this paper. First, the effect of the line length on the impedance characteristics of interconnected system is analyzed, and the aggregated RLC circuit approach is applied for the quantitative assessment of potential resonance risk. Then, the variation trend of system impedance characteristics caused by different wind turbines number is revealed, and resonance risk affected by the number of wind turbines integrated from the different location is evaluated by calculating system resonance damping around the resonant frequency. Finally, the simulation results on the RT-LAB platform validate the theoretical analysis.
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