基于坐标变换的永磁同步电机电流传感器容错控制∗

摘要

研究了在永磁同步电机矢量控制系统之下，电流传感器的故障诊断及容错控制。针对目前双电流传感器的矢量控制系统中可能出现的软故障，提出一种基于定子坐标变换的故障诊断及容错方法，通过控制器输出的电流值与实际反馈的电流值相比较，来判断故障类型并选择相应的容错方案。仿真结果表明：该方法能准确判断出一相或两相电流传感器故障，并选择相应的实际电流计算值来完成电流闭环控制，具有较高的可行性。%A technique for fault detection and isolation to make the traditional vector control of PMSM system drive fault tolerant against one or two phase current sensor soft failure were presented. Comparison between the output current value and the feedback value, the proposed current axes transformation were expected to determine the fault type and select the appropriate fault tolerance scheme. The simulation results showed that the control system could accurately judge the one or two phase current sensor faulty and select the corresponding current calculation value to complete the current closed-loop control, with a high feasibility.