基于差分运算的望远镜驱动系统非预期故障重构方法

Unanticipated fault reconfiguration method for a telescope drive system based on the difference operator

极端环境下的望远镜驱动系统永磁同步电机传感器容易面临非预期故障,导致系统观测性能下降,甚至可能造成望远镜停机。在这种情况下,提出一种用于望远镜驱动系统电流传感器的故障重构方法,主要包含故障检测、隔离和重构等几个方面。其中,故障检测由三阶级联差分运算完成,对不同的故障类型、即使微小故障也能有很好的鲁棒性;决策逻辑电路根据故障检测提供的故障信号flag执行隔离操作;Switches开关根据隔离动作选择合适的电流,以达到故障重构目的。仿真试验表明,该方法从故障状态切换到健康状态是平稳的,且不影响系统的动态性能,确保驱动系统的可靠性和稳定性。

In extreme environments,the sensors of the permanent magnet synchronous machine in a telescope drive system are prone to unanticipated faults,which leads to a decrease in the observation performance of the system and may even cause the telescope to shut down.Under these circumstances,a fault reconfiguration method for current sensors of the telescope drive system was proposed,which mainly included several aspects of functions such as fault detection,isolation and reconfiguration.Among them,the fault detection was completed by a three-cascade difference operator,which was robust to diverse types of faults,even to incipient faults;the decision logic circuit performed isolation according to the fault signal flag provided by fault detection;the Switches selected appropriate currents in accordance with the isolation actions to achieve the purpose of fault reconfiguration.The simulation experiments indicate that the strategy can switch from fault state to healthy condition smoothly without affecting the dynamic performance of the system,and guarantees the reliability and stability of the drive system.