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大型双馈风电场经MMC-HVDC并网的次同步振荡及其抑制

DOI: 10.13334/j.0258-8013.pcsee.2015.19.002, PP. 4852-4860

Keywords: 柔性直流输电,双馈风电机组,模块化多电平换流器,高压直流输电,次同步振荡

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Abstract:

基于模块化多电平换流器(modularmultilevelconverter,MMC)的柔性直流输电技术(MMC-HVDC)已成为大规模、远距离海上风电场并网的理想解决方案。由于MMC自身的结构特点,当大型双馈风电场通过基于MMC的纯柔性直流输电系统并网时,可能会产生次同步振荡(subsynchronousoscillation,SSO)现象。该文研究了大型双馈风电场经MMC-HVDC系统并网出现的SSO现象,理论分析并推导了次同步振荡电流在MMC-HVDC系统中的分布及传播机制。从换流器控制的角度出发,提出一种基于附加次同步振荡电流抑制的送端换流站控制策略。最后通过MATLAB/Simulink软件搭建了基于21电平MMC-HVDC的两端输电系统模型,仿真结果验证了理论分析和所提出的次同步振荡电流抑制策略的正确性。

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