Subsynchronous oscillation suppression method based on subsynchronous oscillation short-circuit ratio index

The invention relates to a subsynchronous oscillation suppression method based on a subsynchronous oscillation short-circuit ratio index, and the method comprises the following steps: 1), building anequivalent impedance model of a doubly-fed wind turbine generator through a flexible DC grid-connected system in consideration of an internal control structure of the doubly-fed wind turbine generator; 2) defining a subsynchronous oscillation short-circuit ratio index SSCR considering various influence factors, and 3) adjusting the subsynchronous oscillation short-circuit ratio index SSCR according to different parameter orders of magnitudes and sensitivities to achieve subsynchronous oscillation suppression, and the method has the advantages of being accurate in model, suitable for suppressing subsynchronous oscillation and the like compared with the prior art. 本发明涉及一种基于次同步振荡短路比指标的次同步振荡抑制方法，包括以下步骤：1)考虑双馈风力发电机组内部控制结构，建立双馈风电机组经柔性直流并网系统的等值阻抗模型；2)定义计及多种影响因素的次同步振荡短路比指标SSCR；3)根据不同参数数量级和灵敏度调整次同步振荡短路比指标SSCR，实现抑制次同步振荡。与现有