改进的双馈风电机组故障穿越控制策略研究

基于传统矢量控制技术,该文提出一种改进的矢量控制技术来抑制双馈感应电机故障期间的转子过电流,以提高双馈风电机组故障穿越能力。从分析传统矢量控制技术入手,提出一种改进的矢量控制技术,其主要特点是反映定子电压瞬态对转子电流的影响,但并未增加控制的复杂程度。从理论的角度对所提方案能提高双馈风电机组故障穿越能力的机理进行深入分析。最后,对基于PSCAD/EMTDC软件环境下搭建的2 MW双馈风电机组模型进行仿真研究。仿真结果表明所提方案能有效抑制双馈感应电机故障期间的转子过电流,从而提高双馈风电机组的故障穿越能力。

RESEARCH ON AN IMPROVED FAULT RIDE THROUGH CONTROL STRATEGY OF DFIG-BASED WIND TURBINE

Based on the traditional vector control technology, an improved vector control technology is proposed to suppress the rotor over-current during the fault period of DFIG based wind turbine, so as to improve its fault ride through （FRT） capability. In this paper, starting from the analysis of traditional vector control technology, an improved vector control technology is proposed. Its main feature is to reflect the influence of stator voltage transient on rotor current, but it does not increase the complexity of control. In this paper, the mechanism that the proposed scheme can improve the FRT capability of DFIG based wind turbine is analyzed theoretically. Finally, a 2 MW doubly fed wind turbine model based on PSCAD/EMTDC is simulated. Simulation results show that the proposed scheme can effectively suppress the rotor over-current during DFIG fault and improve the FRT capability of DFIG based wind turbine.