双馈型变速恒频风力发电系统的鲁棒控制

研究了双馈变速恒频风力发电系统的鲁棒控制问题. 采用定子磁场定向的矢量变换技术, 建立了系统非线性数学描述, 利用非线性鲁棒控制技术, 设计了能实现发电机输出有功功率和无功功率鲁棒解耦控制, 同时具有鲁棒干扰抑制作用的转子励磁控制器. 理论分析和仿真结果均表明, 所设计的控制器可以保证在风速变化、系统参数不确定性和外部干扰的情况下, 风力发电系统仍能安全可靠地最大获取风能, 并且输出恒频恒压的电量.

Robust control for doubly-fed induction generators (DFIG) with variable speed and constant frequency in wind power systems

The robust control problem is addressed for the variable speed/constant frequency wind power generation systems equipped with doubly-fed induction generators. The wind power system is mathematically modeled by using the field-oriented vector-transformation of the stator. A rotor excitation controller is designed by utilizing nonlinear robust control technology, which realizes the robust decoupling control for the active and reactive power of the generator, and the attenuation of the external disturbance. The theoretical analysis and the simulation show that under variable wind-speed, uncertain parameters and the external disturbances, the proposed controller guarantees the wind power system to achieve the maximal absorption of wind power in the secure and stable operation, and to output the electrical power with constant frequency and constant voltage for the grids.