中文摘要：

以三电平双脉宽调制（PWM）结构型永磁直驱风力发电系统为研究对象，永磁同步发电机（PMSG）直接与电压源型双PWM变换器相连，然后与电网并网。发电机侧变换器采用预测直接功率控制（DPC）的策略，不仅可以获得固定的开关频率、功率环控制无需比例积分（PI）调节器、参数设计简单、系统动态响应快、输入电流畸变率低，并可以直接控制系统的瞬时有功、无功功率。网侧变换器基于虚拟磁链定向的DPC，并采用无交流电压传感器的DPC策略，增加了系统的可靠性。在Matlab／Simulink中搭建仿真模型，并进行了实验，验证了系统的可行件，

英文摘要：

The three-level dual pulse width modulation （PWM） structure permanent magnet direct-drive wind power generation system is studied.Permanent magnet synchronous generator（PMSG） is directly connected with the voltage source dual PWM converter and connected to grid.Predictive direct power control（DPC） strategy is adopted for generator-side of the converter, a fixed switching frequency is obtained, proportional integral（P I） regulator is not required to power loop control, parameter design is simple, dynamic response of the system is fast and input current distortion is low, and active and reactive power are directly eontrolled.DPC of AC vohage-sensorless controller is adopted based on virtual flux oriented DPC for grid-side converter, increasing the reliability of the system.The simulation model is built up in Matlab/Simulink, and the experiments verify the feasibility of the system.