双馈风力发电系统的MPPT自适应滑模控制

Adaptive Sliding Mode Control for Maximum Power Point Tracking of Doubly-Fed Wind Turbine

针对双馈风电机本身固有的非线性特性及外界干扰对系统影响等问题,设计具有自适应控制增益的滑模控制器,使系统在外部干扰和参数不确定的情况下,实现最大功率点跟踪(MPPT)的鲁棒控制。首先通过风机气动模型分析MPPT特性曲线,采用定子磁场定向控制建立面向控制器的风机模型;其次考虑系统的不确定上界有界未知问题,设计MPPT自适应滑模控制器;最后选取1.5 MW双馈风力发电机组进行算例仿真。结果表明,设计的控制器不仅能在参数存在未知扰动的情况下,实现对最大功率的稳定跟踪控制,并能有效抑制抖振,具有较强的鲁棒性。

For the inherent nonlinear characteristics of doubly fed wind turbine and the influence of external disturbance on the system,a sliding mode controller with adaptive control gain was designed,so that the system can realize maximum power point tracking(MPPT)control under external disturbance and parameter uncertainty.Firstly,The MPPT control characteristic curve was analyzed by the aerodynamic model,and the model oriented controller of doubly fed wind turbine was established based on the vector transformation method of stator oriented magnetic field.Secondly,considering the problem that the uncertain upper bound of system is bounded and unknown,an adaptive sliding mode controller was designed.Finally,a 1.5 MW doubly fed wind turbine was selected for simulation.The results show that the adaptive sliding mode controller not only can realize the stable tracking control of maximum power in the presence of unknown parameters disturbance,but also can effectively suppress the chattering and has strong robustness.