关键词: 风力发电, 直驱永磁同步发电机, 最大功率点跟踪, 模糊控制, 梯度式步长扰动

Abstract: In order to improve the maximum power point tracking(MPPT) control performance of thedirect drive permanent magnet synchronous generator(D-PMSG) system, through the analysis of the relationship between the Boost duty cycle change and the output characteristics of the wind turbine, a mountain climbing search method based on the fuzzy gradient step was proposed. The change of the wind turbine output speed and the change of the wind turbine output power were taken as the input of the fuzzy controller, and the duty cycle of the Boost converter was taken as the output of the fuzzy controller to achieve the maximum power point tracking control of the wind turbine. The simulation model of the system was established for the verification. The results show that the fuzzy gradient step mountain climbing search algorithm can realize the maximum power point tracking control of D-PMSG system, and the control effect is superior to the traditional variable step mountain climbing search algorithm.

Key words: wind power generation, direct drive permanent magnet synchronous generator(D-PMSG), maximum power point tracking(MPPT), fuzzy control, gradient step disturbance