This paper presents the advantages of LVRT technology where a crowbar circuit functions in combination with a chopper circuit. To enhance the low voltage ride-through (LVRT) performance of double-fed wind turbines, the advantage of the crowbar protection circuit, the DC-link chopper protection circuit, and rotor side control (RSC) are combined based on current LVRT technology. The crowbar circuit is fully utilized to protect the rotor circuit from overcurrent and plays the role of the chopper circuit to stabilize the DC bus voltage. In addition, this paper proposes a cooperative control strategy that is used in the control of the protection circuit during LVRT. Simulation results based on PSCAD/EMTDC demonstrate that the proposed method can significantly reduce crowbar switching times and LVRT time, and the control method is simple and feasible.

本文介绍了 LVRT 技术的优势，其中撬棒电路与斩波电路结合使用。为了提高双馈风机的低电压穿越（LVRT）性能，在现有的低电压穿越技术的基础上，结合了撬棒保护电路、直流环节斩波保护电路和转子侧控制（RSC）的优点。撬棒电路充分利用保护转子电路免受过流影响，并起到斩波电路的作用，稳定直流母线电压。此外，本文提出了一种协同控制策略，用于低电压穿越过程中保护电路的控制。基于PSCAD/EMTDC的仿真结果表明，该方法可以显着减少crowbar切换次数和LVRT时间，控制方法简单可行。