开关磁阻电机功率变换器容错控制方法

Fault-tolerant control method of power converter for switched reluctance motor

功率变换器是开关磁阻电机驱动系统易出现故障机构之一,为提高该驱动系统可靠性与容错性,本文以不对称半桥型功率变换器为研究对象,针对功率管短路与开路故障分别提出不同在线容错控制方法.通过对调故障相两功率管工作状态实现斩波功率管短路故障容错控制,基于细菌觅食算法(bacterial foraging algorithm)优化的PI速度控制器来降低转矩脉动以消除常闭功率管短路故障造成的恶性影响,并通过实时在线调整非故障相的导通角与关断角实现功率管开路故障容错控制.仿真与实验结果表明,所提方法能够根据故障诊断详情及时进行在线容错控制,且容错效果良好,无需增加任何硬件结构,操作简单易行,可避免故障运行造成的恶性影响.

Power converter is one of the weakest parts of switched reluctance drives system.In order to improve the reliability and fault tolerance of the drive system,this paper takes deeply look in asymmetrical half-bridge power converter to respectively present different on-line fault tolerant control methods for open-circuit and short-circuit fault of power converter.For short-circuit occurred on chopper tube,working status of two power tubes are regulated mutually.For shortcircuit occurred on closed tube,the current of fault phase is regulated through a controller optimized by bacterial foraging algorithm(BFA).For open-circuit occur on power tube,conduction angles of normal phases are regulated.The simulation and experimental results show that these presented control methods can achieve fault tolerance timely according to the fault diagnosis details,and the effects of fault tolerance are very well,that avoiding serious consequences caused by faulted running.