Abstract

An intelligent dual-mode control strategy is proposed to extend the MPPT operation range of doubly-fed induction generator (DFIG) and improve the power generation efficiency under low wind speed in this article. By adjusting the strategy of the machine-side converter (MSC) and the necessary switchover, DFIG can automatically operate in two modes depending on the wind speed: the traditional DFIG mode and the DFIG stator short circuit (SSC) mode. In addition, aiming at the characteristics of short time, large impact, and long impact of mode switching process, this article focuses on the flexible mode switching control methods rarely mentioned in other studies, especially the specific process of bidirectional mode switching, MSC control strategy, and the selection of generator load. Finally, the hardware-in-the-loop (HIL) simulation results based on RT-lab show that the control strategy proposed in this article takes the advantages of the low cost of DFIG and the wide speed range of full-power generator (FPG), and achieves fast and flexible switching between the two modes.

摘要

本文提出了一种智能双模控制策略，以扩展双馈感应发电机的MPPT工作范围，提高低风速下的发电效率。通过调整机器侧转换器（MSC）的策略和必要的切换，DFIG可以根据风速自动以两种模式运行：传统的DFIG模式和DFIG定子短路（SSC）模式。此外，针对模式切换过程时间短，影响大，影响长的特点，本文着重研究其他研究中很少提及的柔性模式切换控制方法，特别是双向模式切换的具体过程，MSC控制策略。 ，以及发电机负载的选择。最后，