基于模糊滑模控制的风力发电系统最大风能追踪

针对永磁同步风力发电系统,从空气动力学的基础理论入手,分析了机组运行时的最大风能追踪原理.根据已知的风力机特性和滑模变结构系统理论,推导出在切换面上的等效控制和切换面上滑模运动的状态方程.为了削弱抖振,采用基于最大风能追踪控制的模糊滑模控制方法,根据系统状态在线调整切换控制增益系数.通过Lyapunov稳定性定理得到系统渐进稳定的充分条件.构建系统模型并进行仿真比较,仿真运行结果证实了该控制策略的正确性和有效性.

Maximum Power Point Tracking of Wind Turbine Systems Based on Fuzzy Sliding Mode Controller

According to the basic aerodynamics theory, the principles of maximum power point tracking (MPPT) were analyzed for the PMSG wind turbine system in this paper. The equivalent control and state equations of sliding mode motion on the switching surface were derived based on the known characteristics of wind turbines and variable structure control theory. In order to weaken the chattering of sliding mode control, a method of fuzzy tuning quasi sliding mode control (FQSMC) for the MPPT was presented. The gain coefficient of switching control was tunned online according to the system state. Moreover, a Lyapunov based closed loop stability analysis was discussed and a sufficient condition for asymptotic stability was obtained. Finally, the system model was built and simulation results were compared with those of the PID method, which showed the effectiveness of the proposed control strategy.