基于STATCOM的双馈风机机网扭振抑制策略研究

A novel method for damping torsional vibrationsin DFIG-based wind generators using STATCOM

风力发电系统中风电机组传动轴的扭振现象使机械轴系零件,尤其齿轮箱常处在疲劳运行状态,长期运行很容易造成零件的损坏。提出一种基于静止同步补偿器(STATCOM)的双馈风机机网扭振抑制策略。通过建立STATCOM的数学模型,找出其无功功率控制方法,在此基础上利用STATCOM的无功功率输出动态特性快速的特点,在电网发生故障或者干扰时,及时控制无功功率的输出以稳定风机母线电压,从而有效地抑制机网扭振。最后,在Matlab/Simulink上进行仿真验证,结果表明,对于由传输线路末端无限大电网的电压暂降和电压突升的干扰引起的风机轴系扭振,STATCOM能够有效地进行抑制。

This paper proposed a novel damping control algorithm by using static synchronous compensator （STATCOM） to damp torsional vibrations maintaining elements of the mechanical shaft running overload in doubly fed induction generator （DFIG） based wind turbine systems. Firstly, a mathematical model based on STATCOM was built and the control strategy of reactive power was designed. Then, by using the dynamic characteristics fast response of reactive power in STATCOM, when a fault or distortion occurred, it can control the output of reactive power to stable the bus voltage, which can effectively damp torsional vibrations. Finally, Simulations with Matlab/Simulink were applied to evaluate the proposed method. Results show that STATCOM can effectively damp torsional vibrations caused by voltage sags in wind turbine systems.