基于四相全桥的磁悬浮轴承开关器件开路故障容错控制策略  

Fault-Tolerant Strategy of Four-Phase Full-Leg for Active Magnetic Bearing in Case of Open Circuit Fault of Switching Device

作　　者：胡烽 孙宏博 蒋栋[1] 杨佶昌 Hu Feng;Sun Hongbo;Jiang Dong;Yang Jichang(State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology,Wuhan 430074 China)

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学),武汉430074

出　　处：《电工技术学报》2022年第9期2295-2305,2340,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51877091)。

摘　　要：功率半导体开关器件的开路故障是主动磁悬浮轴承系统失效的一个主要原因。为了保障主动磁悬浮轴承在高速旋转场合安全可靠运行,该文在功率放大器容错控制方面,针对四相全桥拓扑提出一种开关器件开路故障容错控制策略。首先从四相四桥臂工作原理出发,分析了四相全桥拓扑的两种工作模式对磁轴承的作用力和控制效果相同,可利用该特性进行功放容错设计;然后基于电流差分控制的特点给出了判断开路故障的条件,并提出相应的容错控制策略,即一旦四相全桥拓扑正常模式下的开关器件发生开路故障,在几百微秒内将检测到故障的发生,并立即切换至冗余模式下工作,以达到故障不停机的目的;最后仿真与实验结果表明故障检测时间和位移波动范围均保证了切换过渡过程中磁轴承的悬浮,证明了该容错控制策略在四相全桥拓扑上的可行性。Open circuit fault of power semielectronics switching devices is a main reason for the failure of active magnetic bearing(AMB)system.A fault-tolerant control strategy for four-phase fullleg is proposed to guarantee the safe and reliable operation of AMB under the high-speed rotation in case of open circuit fault of switching device.Firstly,it’s analyzed that two modes of four-phase full-bridge have the same electromagnetic force and control effect on the AMB base on the working principle of four-phase four-bridge,that feature could be used to design fault-tolerance of power amplifier.Then the condition for judging open-circuit fault is given based on differential current control,and the corresponding fault-tolerant control strategy is devised,so that when the open-circuit fault occurred to the switching devices of normal mode,the fault would be detected in a few hundred microseconds,then four-phase full-leg would immediately switch to the redundant mode to work to achieve the equipment didn’t stop.Finally,the simulation and experimental results show that both fault detection time and displacement fluctuation range guarantee the suspension of AMB in the transition process,which prove the feasibility of the fault-tolerant control strategy for four-phase full-leg.

关 键 词：主动磁悬浮轴承 四相全桥 开路故障 容错控制 

分 类 号：TM46[电气工程—电器]