摘要
针对滑模控制严重抖动问题,提出一种带干扰观测器的滑模控制方法,用于控制三相电压型PWM变换器电流内环的电流。推导出在两相同步旋转坐标系下含干扰的PWM变换器数学模型,考虑到建模误差和两相电流之间的耦合关系,得到了含不确定项的全二阶解耦系统模型。设计的比例与常值切换相结合的滑模控制器和基于误差跟踪的干扰观测器可以用于对模型的不确定项进行观测,通过构造李雅谱诺夫函数得到了控制与观测所需的参数设计条件。针对3种不同的不确定因素进行了仿真。结果表明,与PI控制、普通的滑模控制相比,提出的含干扰观测器的滑模控制方法在控制精度、鲁棒性以及稳定性方面有明显的优势。
Aiming at the serious chattering problem to sliding mode control,a sliding mode control method with disturbance observer was presented to control currents of inner ring of three-phase voltage source PWM converter.First,the PWM converter mathematical model with disturbances under two-phase synchronous rotating coordinate system was deduced with consider of the modeling error and the coupling relationship between the two phase currents,and a whole second order decoupling system model was obtained with uncertainty.Second,a sliding mode controller was designed with ratio constant switching,and a disturbance observer was proposed based on error tracking to observe the uncertainties of the model.Then,Lyapunov function was constructed to get design conditions parameters of the controller and observer.At last,the results of simulation tests,in which four different kinds of uncertain factors were considered,show that the proposed method has obvious advantages in terms of control precision,robustness and stability,with the comparison of PI control and single sliding mode control.
出处
《电机与控制学报》
EI
CSCD
北大核心
2015年第2期109-116,共8页
Electric Machines and Control
基金
国家自然科学基金(61273159
61105080
60904077)
