摘要
风电机组非线性、不确定、多干扰等特点,使得控制器设计成为一项极具挑战的研究课题。拟连续高阶滑模控制方法对外部干扰、未建模动态和参数不确定具有强鲁棒性,且能够有效削弱抖振,所以在风速低于额定风速时,采用拟连续高阶滑模控制方法对风电机组转矩控制问题进行研究。首先,在传统滑模控制的基础上继续求导,设计拟连续二阶滑模转矩控制器,在有限时间内实现对参考转速的稳定跟踪。其次,根据Lyapunov理论证明该控制器的稳定性。最后通过仿真和对比分析验证所设计的拟连续二阶滑模转矩控制器不仅能够通过控制发电机转矩实现功率的最大输出,而且能够有效的抑制抖振现象,控制系统具有强鲁棒性。
The characteristics of wind turbines such as nonlinearity,uncertainity and more interference present great challenges for designing controllers.The quasi-continuous high order sliding mode method is used to design controllers due to its strong robustness to external disturbances,unmodeled dynamics and parameter uncertainties,and the chattering phenomena can be effectively suppressed.Therefore,control of the wind turbine torque is investigated based on this method when the wind speed is lower than the rated wind speed.Firstly,a quasi-continuous second order sliding mode torque controller is designed on basis of the traditional sliding mode control,ensuring that the system would track the reference speed within a limited time.And then the stability proof of the controller is given through Lyapunov theory.Finally,simulation results and comparative analysis show that the designed controller can achieve the maximum output power by controlling the generator torque.And the chattering phenomena is effectively suppressed,which verifies the well robustness of the control system.
引文
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