直驱永磁同步风力发电机的最佳风能跟踪控制

与双馈交流励磁风力发电系统相比，直驱永磁同步风力发电系统具有结构简单、发电效率及运行可靠性高等优点。文章采用双脉宽调制(pulse-width modulation，PWM)变换器作为直驱永磁同步发电机的并网电路，根据风力机和发电机的运行特性提出了一种基于最佳功率给定的发电机最大风能跟踪控制策略。建立了基于双PWM变换器的直驱永磁同步风力发电实验系统，实验结果验证了所提出控制策略的正确性。该发电系统可实现最大风能跟踪控制、并网有功和无功功率独立控制以及变速恒频发电运行。

Optimal Wind-Energy Tracking Control of Direct-Driven Permanent Magnet Synchronous Generators for Wind Turbines

Compared with the doubly-fed AC excited wind-power generation system,direct-driven permanent magnet synchronous wind-power generation system possesses such features as simpler structure,higher generation efficiency and good operation reliability.In this paper a back-to-back PWM converter is used to connect the direct-driven permanent magnet synchronous generator(PMSG) with power grid,and according to the operating characteristics of wind turbine and wind power generator an optimal power reference based maximum wind-energy tracking control strategy for wind power generator is proposed.A back-to-back PWM converter based experimental direct-driven permanent synchronous wind power generation system is built,and the correctness of the proposed control strategy is validated by experiment results.Using the proposed generation system,the maximum wind-energy tracking control,independent control of active and reactive power transmitted to power grid as well as the variable speed constant frequency(VSCF) power generation can be implemented.