In this article, a novel winding switching strategy is proposed to improve the flux-weakening capability of a hybrid-excited reluctance machine (HERM). The key is that in low-speed operation, the primary and the secondary windings are connected in series and serve as armature winding to maximize output voltage while in high-speed operation, the secondary winding is switched to dc excitation winding to realize variable speed constant voltage output. The machine configuration, operation principle with dual excitation sources, winding switching concept, and manipulation circuit are illustrated in detail. Then the electromagnetic characteristics of HERM in different operation status are investigated. Finally, the variable speed constant voltage output of wind power generation system resorting to winding switching as well as dc excitation regulation is verified with Maxwell/Simplorer cosimulation.

中文翻译：

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一种新型交直流混合励磁风力发电机绕组切换控制策略


在本文中，提出了一种新颖的绕组切换策略来提高混合励磁磁阻电机（HERM）的弱磁能力。关键是在低速运行时，初级和次级绕组串联，作为电枢绕组，使输出电压最大化；而在高速运行时，次级绕组切换为直流励磁绕组，实现变速恒速电压输出。详细说明了机器配置、双励磁源工作原理、绕组切换概念和操纵电路。然后研究了HERM在不同运行状态下的电磁特性。最后，通过Maxwell/Simplorer联合仿真验证了采用绕组切换和直流励磁调节的风力发电系统的变速恒压输出。