基于分数阶滑模的风力发电机直接功率控制

Direct Power Control Based on Fractional Order Sliding Mode for Wind Generator

为了改善双馈风力发电系统的控制性能,将分数阶滑模控制应用于双馈风力发电机的直接功率控制系统中。将分数阶微积分引入到滑模控制中,构成分数阶滑模控制器,利用分数阶的遗传衰减特性削弱滑模控制的抖振。推导了应用于双馈风力发电系统的分数阶滑模控制律,并用李雅普诺夫稳定性定理证明了系统的稳定性。所提出的分数阶滑模控制系统省略了电流环控制,简化了控制结构,实现了有功功率和无功功率的有效控制。仿真与试验结果显示出所用分数阶滑模控制策略的有效性,同时表明该系统削弱了传统滑模控制中存在的抖振。

In order to improve the control performance of the doubly fed wind generator,the fractional order sliding mode control was used in the direct power control system of the doubly fed wind generator.The fractional order calculus was introduced into the sliding mode control to constitute a fractional order sliding mode controller,which weakened the chattering of the traditional sliding mode control by using the fractional order genetic attenuation characteristics.The fractional order sliding mode control law was derived for doubly fed induction generator,and the stability of the system was proved by Lyapunov stability theorem.The proposed fractional order sliding mode control system saved the current loop control,simplified the control structure,and realized the effective control of active power and reactive power.The simulation and experimental results showed the effectiveness of the proposed fractional order sliding mode control system and the weakening of the chattering in the traditional sliding mode control.