基于模式切换的直驱式风力发电机最大功率跟踪控制

MPPT control of direct-driven wind turbine generators based on mode switch

变步长爬山搜索法具有算法简单,跟踪精度高的特点,但在搜索阶段风速有较大变化时有跟踪失误的缺点。最优叶尖速比法风速快速波动时,能够快速跟踪,鲁棒性强,但风速不易测量,具有局限性。针对上述问题,提出将基于LS-SVM风速估计的最优叶尖速比法和变步长爬山搜索法相结合构建一种模式切换的最大功率跟踪方法,仿真结果已证明此方法的有效性和可行性。

Variable step climbing search method is proven to be conciseness,and high tracking efficiency,but during the search stage,there are disadvantages of tracking errors in case of rapid changes in wind speed. Optimum tip speed ratio method is featured with quickly tracking and strong robustness when wind speed changes rapidly,while the wind speed is difficult to measure and has limitations. In view of the above issues,the maximum power point tracking control method is presented based on mode switching which combined optimal tip speed ratio method based on LS-SVM wind speed estimation with variable step climbing search method. The simulation results showed the effectiveness and feasibility of this method.