兆瓦级永磁同步风力发电机矢量控制策略

On the vector control method for MW level direct driven wind turbines

文章针对兆瓦级永磁同步风力发电直驱系统的应用,提出了一种基于定子电流定向的永磁同步风力发电机复合矢量控制策略;该策略在发电机切入速度与转折速度间采用最大转矩电流比控制方式提高系统的发电功率,在转折速度至极限速度间,采用最大功率输出的弱磁控制方式提高系统的稳定性;根据实时检测的发电机运行状况,2种控制策略实现相互转换,应用所提方案于兆瓦级永磁同步风力发电机的控制系统,通过仿真和实验验证所提方案的正确性和可行性。

Aimed at the application of MW level direct-drive wind power generating system, one permanent magnet synchronous generator （PMSG） compound vector control scheme based on stator current orientation is proposed in this paper. Between the cut-in speed and turning speed of generator, the scheme adopts the maximum ratio of torque to current control mode to advance the system generating power, and uses the flux-weakening control of maximum power output between the turning speed and limiting speed, to improve the system stability. According to the real time monitoring generator operating status, two control strategies mentioned above can transform each other. Accuracy and feasibility of the proposed scheme used in the MW level PMSG control system have been proved by the simulation and experiment.