风电机组变桨距系统的反推滑模控制

Backstepping Sliding Mode Control of Wind Turbine Variable Pitch System

传统的变桨距控制器在风速快速变化的情况下难以达到良好的效果,为改善系统的动态性能并实现恒功率输出,提出了基于精确反馈线性化(EFBL)的风电机组变桨距系统反推滑模控制方案。该方案首先将原非线性系统模型进行全局线性化处理,再将滑模控制和反推控制结合设计出反推滑模控制器(BSMC)。该控制器既保证了风机在高风速下具有良好的稳定性,又避免了单独使用传统反推设计方法带来的计算过程复杂的问题。仿真结果表明,通过与传统滑模控制器(SMC)进行对比,该方案有效地改善了风电机组变桨距系统的控制性能,能够很好地稳定风电机组的输出功率。

Traditional variable pitch controller is difficult to achieve good results in rapidly variable wind,in orderto improve the dynamic performance of the system and achieve constant power output,backstepping sliding modecontrol scheme of wind turbines variable pitch system based on exact feedback linearization（EFBL）was proposed.The scheme conduct the original nonlinear system model of the global linearization first,then combines sliding modecontrol with backstepping control to design backstepping sliding mode controller（BSMC）,so that the explosion ofcomplexity in traditional backstepping design is avoided and the wind turbine is more reliable. Comparing withtraditional sliding mode controller（SMC）,the results of the simulation indicate that the scheme improves the controlperformance of wind turbines variable pitch system effectively,and it can stabilize the output power of wind turbines.