基于变风况阻抗优化重塑的双馈风电机组SSO抑制策略

SSO MITIGATION OF WIND TURBINE USING DFIG BASED ON IMPEDANCE OPTIMIZATION RESHAPING UNDER VARIABLE WIND CONDITIONS

针对双馈风电机组经串补电容并网产生的SSO问题,提出一种基于变风况阻抗优化重塑的次同步振荡(SSO)抑制策略。建立abc坐标系下双馈风电机组频域阻抗模型,并基于聚合阻抗稳定判据,采用变风况下穿越灵敏度分析方法筛选出诱发及影响SSO的关键因素。考虑到风况和其他因素对机组稳定性特性的影响,提出基于阻抗重塑的SSO抑制策略。通过优化算法选择抑制策略中的参数值,形成“离线制表,实时调参”的参数优化拟合方案,使得在不同风况下均对SSO达到较好的抑制效果,并通过时域仿真验证了该文所提出的抑制策略的有效性。

Aiming at the SSO problem caused by the grid-connected series-compensated capacitors of doubly-fed wind turbines,a SSO suppression strategy based on optimal reshaping of variable wind condition impedance was proposed.The frequency domain impedance model of the DFIG in the abc coordinate system is established,and based on the aggregated RLC stability criterion,the key factors that induce and affect the SSO are screened out by the through sensitivity analysis method under variable wind conditions.Considering the influence of wind conditions and other factors on the stability characteristics of the unit,this paper proposes a SSO suppression strategy based on impedance reshaping.The parameter values in the suppression strategy are selected by the optimization algorithm,and the parameter optimization fitting scheme of"offline tabulation and real-time parameter adjustment"is formed,so that the SSO can achieve better suppression effect under different wind conditions,and it is verified by time domain simulation The effectiveness of the suppression strategy proposed in this paper.