基于线性标准型的双馈风力发电机组反步滑模控制研究

Research on backstepping sliding mode control of doubly fed wind turbine based on linear standard form

针对双馈风力发电机组易因参数变化、外部扰动等因素影响而出现系统输出功率不稳定的情况,基于线性标准型的双馈风力发电机组模型,设计了一种反步滑模控制策略来提高风电机组的稳定性和抗干扰能力。先通过相应的坐标映射,把多输入多输出双馈风力发电机组非线性系统解耦成单输入单输出的线性标准型;然后,在此基础上,设计了双馈风力发电机组反步滑模控制器,并证明了该控制器不但能够实现机组有功功率稳定输出,而且提高了在输入干扰等不确定因素下系统的鲁棒稳定性。最后,通过分析系统有扰动和无扰动两种情况,证明了在反步滑模控制策略下,双馈风力发电机组在无扰动和有扰动两种情况下都能实现有功功率输出稳定,证明了所设计控制策略的有效性。

In view of the instability of output power of doubly fed wind turbine due to parameter changes, external disturbances and other factors, a backstepping sliding mode control strategy is designed based on the linear standard model of doubly fed wind turbine to improve the stability and anti-interference ability of wind turbine. Firstly, the multi input multi output doubly fed wind turbine nonlinear system is decoupled into a single input single output linear standard form by corresponding coordinate mapping;Then, on this basis, the backstepping sliding mode controller of DFIG is designed, which can not only realize the stable output of active power, but also improve the robust stability of the system under uncertain factors such as input disturbance. Finally, by analyzing the system with and without disturbance, it is proved that the doubly fed wind turbine can achieve active power output stability under the backstepping sliding mode control strategy under both disturbance free and disturbance free conditions, and the effectiveness of the designed control strategy is proved.