摘  要：文章提出了一种用于永磁直驱风力发电系统的改进的最大功率追踪算法（MPPT），研究了发电机转速和DC-DC环节上功率开关器件占空比之间的关系，结合发电机输出功率的符号函数，实现了通过占空比调节以达到最大功率跟踪的目的。并对此算法进行了数学求证，同时通过Matlab/Simulink建模与仿真分析，验证了此改进算法能够显著提高系统最大功率跟踪的快速性和稳定性。
关键词：永磁直驱风力机；最大功率跟踪；占空比

Abstract: This paper presented a improved method of the maximum power tracking algorithm for permanent magnet direct-drive wind power generation system,studied the relationship between the generator speed and the power switching device DC-DC’s duty ratio,combined with the sign function of generator power,achieved by regulating the duty ratio to get the purpose of maximum power point tracking.This paper proved that the principle of the algorithm through the Matlab/Simulink modeling and simulation analysis,verified this improved algorithm can enhance the rapidity and stability of system maximum power point track.
Key Words: Permanent Magnet Direct-drive Wind Turbine(WG);Maximum Power Point Tracking(MPPT);Duty Ratio