面向最大风能捕获的双馈电机新型非线性积分滑模控制

A novel nonlinear integral sliding mode (NNISM) control strategy for maximum wind energy capture of doubly fed induction generator (DFIG) control is proposed. Some elements such as poor wind speed transient performance or low wind energy capture efficiency under the condition of low wind speed fluctuation can be improved by using the new type of maximum power point tracking method. With self-saturation characteristics, the parameters of nonlinear integral sliding mode controller can be adjustable and the chattering can be avoided with the nonlinear potential energy function that can avoid the effect of integral supersaturating. Considering the wind energy utilization coefficient and the maximum tip speed ratio of the wind turbine, the optimal speed setting value of the DFIG under the optimal tip speed ratio is calculated in order to maintain the maximum wind energy utilization of the system. Simulation results show that the control performance of the NNISM control strategy will not degrade in the condition of low wind speed or fluctuated wind speed, and the speed overshoot is small. With fast following speed and strong robust performance, it can achieve the control target of maximum wind energy capture and has broad application prospects.