Flexible DC transmission technology based on modular multilevel converter(MMC)has become an important solution for large-scale long-distance wind power grid connection.However,because MMC itself contains a large number of power electronic devices,there is a risk of causing sub-synchronous oscillation.For the problem of sub-synchronous oscillation,an additional damping control strategy taking into account the rotor side of the wind turbine and the circulation suppressor was proposed.Based on the establishment of the wind power grid connection model,the generation mechanism of sub-synchronous oscillation was further analyzed and studied using the impedance method.The simulation test was carried out by MATLAB/Simulink.The results show that the control strategy can suppress the oscillation faster and improve the power quality better,and verify the feasibility and correctness of the method.
关键词
风电并网/柔性直流输电/次同步振荡/附加阻尼控制/阻抗分析法
Key words
wind power connection/flexible DC transmission/sub-synchronous oscillation/additional damping control/impedance analysis
维普
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