Compared with the double-feed AC excited wind-power generation system, the direct-driven permanent magnet synchronous wind-power generation system possesses such features as simple structure, high generation efficiency and good operation reliability.The "uncontrollable rectifier + boost chopper + PWM converter" are adapted in conversion system.The relationship between duty cycle variation of power switch elements in a DC/DC link and variation of generator speed is analyzed.A new method for adjusting the duty cycle variation for maximum power point tracking is tested.Using the propased generation system, the maximum Wind-energy tracking control as well as the variable speed constant frequency ( VSCF)power generation can be implemented.The simulation and Experiment results have been carried out to verify the feasibility and correction of the proposed system.%永磁直驱风力发电系统与双馈交流励磁风力发电系统相比较,具有结构简单、发电效率及运行可靠性高等优点.采用"不控整流+升压斩波+PWM逆变"的变流技术,推导了发电机转速变化和DC/DC环节上功率开关器件占空比变化之间的关系,研究了利用占空比调节来进行最大功率点跟踪的新方法.该系统可实现最大风能跟踪控制以及变速恒频发电运行,并时系统进行了仿真和实验,实验结果证明了系统的可行性和正确性.
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