中文摘要：

变速恒频双馈风力发电机实现无冲击电流并网的关键是控制双馈电机定子电压的幅度、相位和频率与电网电压高度一致。通过建立并网前后双馈风力发电机系统的数学模型,分析了定子电压频率、幅值及相位与转子励磁电流、转子转速之间的运行规律,提出定子磁场定向转子电流闭环控制策略。实验结果表明,该控制策略能准确实现发电机柔性并网,并且完成有功功率和无功功率的解耦控制。

英文摘要：

In the doubly-fed wind power generation system,it is vital to keep the stator voltage,its phase and the frequency of the machine in strict accordance with the grid voltage amplitude to realize the grid connection with inrush current.Based on the mathematical models of the doubly-fed wind power generation system before and after the grid-connection,the operation principles between the voltage amplitude,phase and freguency and the rotor exciting current and speed were analyzed and a new control strategy was proposed,in which the stator was in field orientation and the rotor current was controlled with closed-loop.Experimental results show that the control strategy can achieve the flexide grid connection and can perform the active and inactive power decoupling control.