中文摘要：

由于系统功率存在损耗,且损耗值随着风速变化而变化,导致基于功率反馈的传统最大风能跟踪策略实际应用时不能准确给定最大功率,从而影响系统风能吸收效率。该文基于直驱式永磁同步风力发电系统,在传统功率反馈控制策略的基础上,提出考虑损耗转矩的最佳电流给定最大风能跟踪控制策略。该方法通过计算系统损耗转矩,给定永磁同步发电机最佳电流值,提高了风能捕获效率。通过构建该直驱永磁同步风力发电系统的仿真模型及实验平台,完成了仿真及实验研究,验证了考虑损耗转矩的最佳电流给定最大风能跟踪控制策略的有效性。将文中所提方法与传统的功率反馈法进行比较,结果证明其效率高于传统的功率反馈法。

英文摘要：

The wind energy capture efficiency of the traditional power feedback maximum power point tracking （MPPT） control strategy is influenced by the inaccurate given maximum power owing to the varying system power losses. In this paper, an optimum current givenMPPT strategy considering the loss torque is proposed on the basis of the traditional power feedback MPPT strategy for the direct-driven permanent magnet synchronous generator （PMSG）. The wind energy capture efficiency can be increased by giving the PMSG optimum current through calculating the loss torque. The simulation model and the experimental platform for the wind energy conversion system （WECS） based on the PMSG are built. Both simulation and experimental results demonstrate the effectiveness of the proposed MPPT strategy. Furthermore, the comparison between the proposed MPPT strategy and the power feedback MPPT strategy shows that the efficiency of the proposed MPPT strategy is higher than that of the traditional power feedback MPPT.