This paper presents a fault online simulation (FOS)-based diagnosis scheme for single and simultaneous open-circuit faults of voltage-source inverters in closed-loop-controlled permanent magnet synchronous motor (PMSM) drive systems. First, the hybrid model (HM) of the motor drive system is established, and the current observer is designed according to the normal HM to detect the fault. This approach can eliminate the effects of speed and load transients and significantly improve the immunity to false alarms. The fault class is then judged according to the current vector phase to reduce the computation load and improve diagnostic reliability. Finally, the fault is isolated on the basis of the FOS technique, the possible fault types are simulated online using the HM, and the simulated residuals between the simulated and measured currents are used for fault isolation. The suggested method avoids extra sensors, is robust to false alarms, and has a relatively fast diagnosis speed. Simulations and experiments validate the proposed diagnosis scheme.

本文提出了一种基于故障在线仿真（FOS）的诊断方案，用于闭环控制永磁同步电动机（PMSM）驱动系统中电压源逆变器的单相和同时开路故障。首先，建立电动机驱动系统的混合模型（HM），并根据常规HM设计电流观测器以检测故障。这种方法可以消除速度和负载瞬变的影响，并显着提高对错误警报的抵抗力。然后根据当前矢量相位判断故障类别，以减少计算量并提高诊断可靠性。最后，基于FOS技术隔离故障，使用HM在线模拟可能的故障类型，仿真电流和实测电流之间的仿真残差用于故障隔离。所建议的方法避免了额外的传感器，对虚假警报具有鲁棒性，并且具有相对较快的诊断速度。仿真和实验验证了提出的诊断方案。