基于主导变量阻尼控制的双馈风电场次同步振荡抑制

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针对双馈风电场经串联电容补偿线路进行输电时,可能发生并网系统的次同步振荡问题.本文首先根据双馈风电场经串联电容补偿并网系统的数学模型建立系统小扰动方程,并通过特征值分析法得到双馈风电场次同步振荡的主导变量.然后,根据系统等效阻抗模型和转子侧控制结构图对主导变量参与次同步振荡的机理进行分析,提出在控制系统中设置由功率阻尼控制模块和电流比例微分阻尼控制模块组成的转子电压补偿器的双馈风电场次同步振荡抑制方法.该方法作用在双馈风机转子侧变换器上,无须增加其他装置,便于在实际工程中应用.最后,通过离线仿真和半实物仿真验证了该抑制方法的有效性.
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