To improve the fault redundancy capability for the high reliability requirement of a brushless doubly-fed generation system applied to large offshore wind farms, the control winding of a brushless doubly-fed reluctance generator is designed as an open-winding structure. Consequently, the two ends of the control winding are connected via dual three-phase converters for the emerging open-winding structure. Therefore, a novel fault-tolerant control strategy based on the direct power control scheme is brought to focus in this paper. Based on the direct power control (DPC) strategy, the post-fault voltage vector selection method is explained in detail according to the fault types of the dual converters. The fault-tolerant control strategy proposed enables the open-winding brushless doubly-fed reluctance generator (BDFRG) system to operate normally in one, two, or three switches fault of the converter, simultaneously achieving power tracking control. The presented results verify the feasibility and validity of the scheme proposed.

为了提高应用于大型海上风电场的无刷双馈发电系统的高可靠性要求的故障冗余能力，将无刷双馈磁阻发电机的控制绕组设计为开放式绕组结构。因此，控制绕组的两端通过双三相转换器连接，用于新兴的开放式绕组结构。因此，本文提出了一种基于直接功率控制方案的新型容错控制策略。基于直接功率控制（DPC）策略，根据双转换器的故障类型详细说明了故障后电压矢量选择方法。提出的容错控制策略使开环无刷双馈磁阻发电机（BDFRG）系统能够在转换器的一，二或三开关故障中正常运行，同时实现功率跟踪控制。提出的结果验证了该方案的可行性和有效性。