摘要
为抑制双馈感应发电机(doubly-fed induction generator,DFIG)风电场与串补输电线路间次同步控制相互作用(sub-synchronous control interaction,SSCI),提出基于改进无源控制的SSCI抑制策略。首先,分析了DFIG并网中SSCI发生机理,发现转子侧变流器双环PI控制对SSCI影响较大,可对PI控制进行改进以抑制SSCI。其次,基于DFIG欧拉-拉格朗日(Euler-Lagrange,EL)模型和无源理论,设计转子侧无源控制器,通过计算稳定状态点,注入阻尼抑制SSCI。为提高抑制能力,采用带通滤波器改进无源控制,通过保持输入信号稳定提升控制器性能。最后,给出小干扰分析和时域仿真分析结果,并与PI控制和常规无源控制对比,验证所提策略在串补度变化和风速变化时的抑制效果。
To mitigate the sub-synchronous control interaction(SSCI)between a doubly-fed induction generator(DFIG)-based wind farm and a series compensated transmission line,an improved passive control strategy to mitigate the SSCI is proposed.First,the mechanism of the SSCI in the DFIG-based wind farm is analyzed.It is found that the double-loop PI controller of the rotor side converter has notable impact on the SSCI,and hence it may be improved to mitigate SSCI.Second,the passive controller to the rotor side converter is designed based on the Euler-Lagrange(EL)model and the passive theory.This controller mitigates SSCI by the finding the steady state point and injecting the damping.To enhance the mitigation capability,a band pass filter is introduced to improve passive control.The input signal is maintained stable to enhance the controller performance.Finally,numerical results using eigen-analysis and time domain analysis are compared with those using the PI control and the normal passive control.The results validate the mitigation effect of the proposed strategy at different compensation levels and wind speeds.
作者
李生虎
叶剑桥
陈东
LI Shenghu;YE Jianqiao;CHEN Dong(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China;Anhui Province Key Laboratory of Renewable Energy Utilization and Energy Saving,Hefei 230009,China)
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2023年第11期77-85,共9页
Power System Protection and Control
基金
国家自然科学基金项目资助(51877061)。
