电力系统自动化2025，Vol.49Issue(7)：35-45,11.DOI:10.7500/AEPS20240513004
不平衡弱电网下构网型双馈风电机组转子侧变流器优化策略
Optimization Strategy for Rotor-side Converter of Grid-forming DFIG-based Wind Turbines Under Unbalanced Weak Grid
摘要
Abstract
When doubly-fed induction generator(DFIG)-based wind turbines operate under an unbalanced power grid,the system has positive-and negative-sequence paths.With the weakening of power grid strength,the coupling between the turbine and the grid intensifies,and disturbances in unbalanced stator voltage will affect the normal operation of the system.In order to study the unbalanced operation and stability mechanism of doubly-fed wind turbine units under a weak grid,first,a small-signal state-space model of DFIG-based wind turbines is constructed,and the stability and unbalanced degree of positive-and negative-sequence rotor current control are analyzed based on the system model.Then,the optimal control strategy based on adaptive virtual impedance is proposed to realize the cooperative compensation for the unbalanced stator voltage and current under the weak grid.The theoretical analysis proves that the proposed strategy effectively improves the stability of the DFIG-based wind turbines under the unbalanced weak grid.Finally,through the hardware-in-the-loop experiment platform,the effectiveness of the proposed optimization strategy is verified.关键词
弱电网/双馈风电机组/不平衡电网/构网型控制/负序控制/状态空间建模Key words
weak grid/doubly-fed induction generator(DFIG)-based wind turbine/unbalanced power grid/grid-forming control/negative-sequence control/state-space modeling引用本文复制引用
徐上,谢震,杨曙昕,李梦杰,杨淑英,张兴..不平衡弱电网下构网型双馈风电机组转子侧变流器优化策略[J].电力系统自动化,2025,49(7):35-45,11.基金项目
国家自然科学基金资助项目(52377177). This work is supported by National Natural Science Foundation of China(No.52377177). （52377177）
